CN104796995B - Distributed channel detects and the method and system of sequential access - Google Patents
Distributed channel detects and the method and system of sequential access Download PDFInfo
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Abstract
Invention proposes a kind of method and systems of distributed channel detection and sequential access.Wherein, the spatial reuse and channel transport efficiency for improving network on the same channel are independently sequentially superimposed by link.Proposed scheme obtains the supremum of the achievable SINR of detecting link only by single iterative process, and this not only lowers implementation complexity, and improve detection accuracy.
Description
Technical field
The present invention relates to wireless communication fields, are divided in environments having no power constraints more particularly to one kind
The method and system of cloth channel detection and sequential access.
Background technology
Wireless network can be seen as some with power control and interactional communication links, and (transmitter-connects
Receipts machine to) set.This modeling is suitble to most of actual wireless systems with interference and coupling, such as CDMA, multi-layer honeycomb
System, intensive cellular system, Cognitive radio networks, ad hoc networks and MIMO transmission and a variety of wireless access technologys of use
The coexisted wireless system of (Radio Access Technologies, RATs), as WiFi and cellular system blend without linear system
System etc..Following wireless network is desirable to accommodate a variety of different communication links, these links are due to meeting different applications
Demand and with different service quality (QoS) requirements.Each in multiple communication links corresponds on the same channel
A single-hop transmission, interfere with each other between them.In order to more efficiently utilize available wireless frequency spectrum, spatial reuse is improved
Efficiency, network always wants to activate communication link as much as possible in the same channel, and is distributed for all active links
Transmission power appropriate so that they Signal to Interference plus Noise Ratio (Signal-to-Interference-and-Noise Ratio,
SINR) it is not less than corresponding expectation threshold value.
In practical applications, system is tended to realize that this desired network expands with a kind of distributed way of autonomy
Exhibition.Distributed medium access control enables to network deployment more convenient, this allows network to have no need to change structure energy
More users are accommodated, and are avoided with user capacity and the increased control overhead of index.For self-organizing network, one
The new communication link of a activity network to be added to wishes to determine whether to be added by oneself.This is for the chain that is newly added
Road proposes practical problem：(probe) channel how is detected in a distributed manner and obtains enough local informations, is used for independently pre-
Survey when it is received by existing network after and meet active link protect (Active Link Protection, ALP) this is prerequisite
Under the conditions of achievable SINR maximum value or supremum.Here, the concept of ALP refers in particular to one kind under no power constraints
Non-intrusive communicating requirement, refer specifically to when the transmission of new link is when its desired SINR level is authorized to and activates, network
It can seek to some power configuration to ensure that it is not small that the practical SINR of all active links in same channel distinguishes
In their target SINR.ALP system conditions are that the premise that improves spatial reuse efficiency and must satisfy is extended using network.
The main target of channel detection is that verification whether there is feasible power distribution when user is added in system, is made
The practical SINR for obtaining all active links is not less than their target S1NR respectively.For the problem best existing scheme by
M.Xiao etc. is proposed (referring to Can Kaowenxian [1]).Fig. 1 shows the flow chart of channel detection process according to prior art.
Invention content
As shown in the flowchart of fig.1, the algorithm of Xiao has used two iterative process accurately to determine new communication link
Whether can be added.However, this scheme remains following deficiency：
(1) existing active link of the new user only in activity network is according to the iteration of particular power optimization algorithm
Operation could send detectable signal after reaching stable in advance, this shows that the algorithm of Xiao is suitable only for the nothing with power control
Gauze network；
(2) power control accuracy being previously-completed will greatly influence the accuracy of channel detection result, and further
Reduce its actual availability；
(3) double iterative process is needed in the detection phase so that practical realization is increasingly complex.
In view of the above problems, the present invention provides a kind of detection of distributed channel and sequential access (DIStributed
Channel prObing and SEquential Access, DISCO-SEA) method and system, this solution provides one kind
Distributed channel detection method is suitable for the wireless network of general not power constraint.
According to the first aspect of the invention, a kind of side carrying out distributed channel detection in the wireless network is provided
Method, wherein in the channel, existing L-1 active link, L is positive integer and L >=2, and every active link includes a pair
Corresponding transmitter and receiver, detecting link L attempt access to the channel, with the L-1 active link simultaneously in institute
Channel signal is stated, the method executes when the detecting link L attempts to join the channel, includes the following steps：
S1：The transmitter of every active link l is in t moment respectively with respective transmission power pl（T), l=1,2 ..., L mono-
1, send signal to corresponding receiver；
S2：The transmitter of the detecting link L is with constant transmission power pL（T)=PLBelieve to its receiver emission detection
Number；
S3：In t moment, the receiver of every active link l determines the statistic SINR of the active link l respectivelyNumerical value, and by signal interference ratio SIRl(t) numeric feedback to active link l transmitter,
Middle GlkIndicate the gain of the channel of the receiver from the transmitter of active link k to active link l, k, l=1,2 ..., L-1 work as k
When=L, Glk=GlL, indicate the gain of the channel of the receiver from the transmitter of the detecting link L to the active link l；
S4：It is based on the signal interference ratio SIR in the transmitter of t moment, every active link ll(t) numerical value and the activity
The target Signal to Interference plus Noise Ratio β of link ltTo update the transmission power p in next moment t+1 of the transmittert(t+1), and
Moment t+1 is with updated transmission power
pl（T+1) signal is sent to corresponding receiver；
S5：Every active link l is iteratively repeated according to t=t+1 modes implements the step S3 and S4 until the letter
It is dry to compare SIRl(t）Numerical stability；
S6：The receiver of the detecting link L determines the statistic SINR of the detecting link LNumerical value, calculate the achievable Signal to Interference plus Noise Ratio of detecting link L supremumAnd it is fed back to
The transmitter of the detecting link L, wherein GLkIndicate the channel of the receiver from the transmitter of active link k to detecting link L
Gain, k=1,2 ..., L-1, as k=L, GLk=GLL, indicate from the transmitter of the detecting link L to the detection chain
The gain of the channel of the receiver of road L；
S7：The transmitter of the detecting link L is by the supremum of the achievable Signal to Interference plus Noise RatioIt is dry with its target letter
It makes an uproar and compares βLIt is compared, whether the channel is had access to the determination detecting link L；And
S8：As the target Signal to Interference plus Noise Ratio β of the detecting link LLLess than the supremum of the achievable Signal to Interference plus Noise Ratio
When, determine that detecting link L has access to the channel.
According to the second aspect of the invention, a kind of distributed letter of the progress of aided detection link in the wireless network is provided
Road detection communication link transmitter, wherein the communication link transmitter with corresponding communication link receiving mechanism at the nothing
An active link in gauze network has L-1 active link and shares the channel, L is positive integer in the wireless network
And L >=2, the detecting link attempt to share the channel with the L-1 active link, the communication link transmitter includes：
Power updating unit, for being surveyed from communication link receiver associated with communication link transmitter reception
The local signal interference ratio of the active link of amount, and according to the target Signal to Interference plus Noise Ratio of the active link and the local received
Signal interference ratio updates its transmission power；
Power Amplifier Unit, for transmission power to be adjusted to updated transmission power to emit,
The wherein described power updating unit iteration updates its transmission power, until the local signal interference ratio of the active link is steady
It is set to only.
According to the third aspect of the present invention, a kind of distributed letter of the progress of aided detection link in the wireless network is provided
Road detection communication link receiver, wherein the communication link receiver with corresponding communication link trigger mechanism at the nothing
An active link in gauze network has L-1 active link and shares the channel, L is positive integer in the wireless network
And L >=2, the detecting link attempt to share the channel with the L-1 active link, the communication link receiver includes：
Receiving unit, for receiving data-signal and the detecting link transmitted by associated communication link transmitter
And interference signal caused by other active links；And
Local signal interference ratio estimation unit, for estimating the active link according to received data signal and interference signal
Local signal interference ratio, and it is fed back to corresponding communication link transmitter,
The wherein described local signal interference ratio estimation unit persistently calculates local signal interference ratio, until the local signal interference ratio calculated is steady
It is set to only.
According to the fourth aspect of the present invention, a kind of link carrying out distributed channel detection in the wireless network is provided
Transmitter, the link transmitters constitute a detecting link in the wireless network with corresponding link receiver, wherein
Have L-1 active link in the wireless network and share a channel, L is positive integer and L >=2, and every active link includes
A pair of corresponding transmitter and receiver, the detecting link attempt to share the channel, the chain with the L-1 active link
Road transmitter includes：
Transmitter unit, for sending detectable signal with constant emission power；
Access controller, the local signal interference ratio for being calculated according to the link receiver calculates the detecting link can be real
The supremum of existing Signal to Interference plus Noise Ratio, and done when the target Signal to Interference plus Noise Ratio of the detecting link is less than the achievable letter calculated
Make an uproar than supremum when, determine that the detecting link has access to the channel.
According to the fifth aspect of the present invention, a kind of link carrying out distributed channel detection in the wireless network is provided
Receiver, the link receiver constitute a detecting link in the wireless network with corresponding link transmitters, wherein
Have L-1 active link in the wireless network and share a channel, L is positive integer and L >=2, and every active link includes
A pair of corresponding transmitter and receiver, the detecting link attempt to share the channel, the chain with the L-1 active link
Road receiver includes：
Receiving unit, the detectable signal sent with constant emission power for receiving associated link transmitters and institute
State interference signal caused by L-1 active link；
Local signal interference ratio estimation unit, the sheet of the detecting link is estimated according to the detectable signal and interference signal that are received
Ground signal interference ratio, and estimated local signal interference ratio is fed back into associated link transmitters,
The wherein described local signal interference ratio estimation unit persistently calculates the local signal interference ratio of the detecting link, until the L-
Until the local signal interference ratio of 1 active link is stablized.
According to the sixth aspect of the invention, a kind of system of distributed channel detection and sequential access is provided, including：
At least one active link, each in the active link include logical according to above-mentioned the second aspect
Believe link transmitters and the communication link receiver according in terms of above-mentioned third；And
Detecting link, the detecting link include according to above-mentioned 4th aspect described in link transmitters and according to above-mentioned
Link receiver described in 5th aspect,
Wherein, whenever a new detecting link attempts access to the channel to exist simultaneously with all existing active links
When the channel signal, implement method according to any one of claim 1 to 6, until the channel is no longer
Until having access to new detecting link.
The DISCO-SEA schemes of the present invention extend net in such a way that link is independently sequentially superimposed on the same channel
Network constantly improves the spatial reuse and channel transport efficiency of network.The scheme proposed is obtained only by single iterative process
The supremum of the achievable SINR of detecting link is obtained, this not only lowers implementation complexity, and improve detection accuracy.
Description of the drawings
By reference to the description of the specific implementation mode of the present invention given by following drawings, it is better understood with this hair
It is bright, and other objects of the present invention, details, features and advantages will become apparent, wherein：
Fig. 1 shows the flow chart of channel detection process according to prior art；
Fig. 2 shows the schematic diagrames detected according to the distributed channel of embodiment of the present invention with the system of sequential access；
Fig. 3 shows the flow chart of the method according to the detection of the distributed channel of embodiment of the present invention and sequential access;
Fig. 4 show according to the distributed channel of embodiment of the present invention detection and sequential access system employed in when
Between frame structure schematic diagram；
Fig. 5 shows the channel configuration of the system according to the detection of the distributed channel of embodiment of the present invention and sequential access
Schematic diagram；
Fig. 6 shows transmitter and the reception of the active link according to embodiment of the present invention in the form of function module respectively
The structure of machine, the structure of the transmitter and receiver of detecting link and during probe interval implement distributed channel detection and
The schematic diagram of sequential cut-in method process；
Fig. 7 shows the link transmitters for distributed channel detection and sequential access according to embodiment of the present invention
With the structural schematic diagram of link receiver；
Fig. 8 shows that the computation complexity of channel detection compares；
Fig. 9 shows that the computational accuracy of channel detection compares；
Figure 10 shows that a kind of embodiment according to the present invention is realized in distributed channel detection and sequential access system
SINR evolution process；
Figure 11 shows the evolution process that corresponding transmission power is developed with the SINR in Figure 10.
Specific implementation mode
The preferred embodiment of the present invention is more fully described below with reference to accompanying drawings.Although showing the present invention in attached drawing
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the present invention without the embodiment party that should be illustrated here
Formula is limited.On the contrary, these embodiments are provided so that the present invention is more thorough and complete, and can be by the present invention's
Range is completely communicated to those skilled in the art.
The basic thought of the present invention is a kind of distributed algorithm, and no power is calculated just with local measurements about
The global supremum of achievable SINR in the case of beam.
In the following, the global supremum of the achievable SINR in the case of no power constraint is theoretically analyzed first, and
Mathematically derive rudimentary algorithm.
1. the supremum of entry criteria and achievable SINR
Problem model is established for the scene of sequential channel access.Consider a movable wireless network, it is assumed that have
L-1 (wherein L is positive integer and L >=2) active links share same common radio channel, and each active link can be realized
It is more higher practical SINR than its target SINR.Link L is one and attempts access to the common radio channel and become the activity wirelessly
The new communication link L is known as detecting link by the new communication link of network in the channel detection stage herein.However
It will be understood by those skilled in the art that when the determining new communication link L has access to the wireless channel and thus with the L-1
When active link shares the wireless channel, which becomes a new active link, with the activity of preceding L-1 items
Link status having the same.
Although detecting link L wants to access the shared channel with its preferred SINR level, activity network only receives
Target SINR is less than the non-invasive link of threshold value so that the network after the extension including new link still meets ALP as before
Requirement.Theoretically, the supremum of this achievable SINR has weighed the remaining sky of the existing activity network of new link utilization
Between reuse the ability of capacity, it is related to the collective channel parameter of network after entire extension and not only with existing L-1 work
Dynamic link is related.The activity network institute that can be continually updated successively according to this non-intrusive rule, new non-invasive link
It receives, and is added on same channel, until the expansion of network reaches critical point.
For the network after one the not extension of power constraint, one group of power distribution p=s [p1p2…pL]TWork as satisfaction
When following condition 1 and condition 2, it is feasible to claim this group of power distribution.
Condition 1：
Wherein, plIndicate the transmission power of link l；
βlIndicate the target SINR of link l；
GlkIndicate the channel gain the receiver from the transmitter of link k to link l；
nlThe power for indicating the ambient noise at the receiver of link l, to illustrate thermal noise and due to other communications
Caused by the gross effect interfered.
The Ferror-Frobenius characteristic values that condition 1 is equivalent to regulation matrix diag (β o v) F are less than 1 (referring to reference to text
Xian [1]And [2]), i.e.,
Condition 2：g(βL)<1,
Wherein g (βL)=ρ (diag (β o v) F), ρ () indicate the Perron-Frobenius characteristic values of nonnegative matrix；
Diag () indicates the diagonal matrix that the component by vector is constituted；
O indicates Schur product calculations；
β=[β1β2…βL]T；
F indicate size be L square formation, describe channel between interfering with each other, wherein
Here, g (βL)=ρ (diag (β o v) F) is indicated g (βL) one is defined as about βLFunction.
In fact, condition 2 determines the set S of an achievable SINR for new linkfeasible, can be with table
It is shown as
Sfcasble={βL∈R+|g(βL)<1 },
Wherein R+Indicate positive real number.
On the other hand, matrix diag (β o v) F can be with piecemeal：
Wherein, fL, L-=[GL1 GL2 … GL（L-1）]；
fL-,L=[G1L G2L … G(L-1)L]T；
FL-It indicates to arrange obtained principal minor array by the L rows and L of puncture table F；
βL-=[β1β2…βL-1]T；
In fact, Perron-Frobenius characteristic values associated with matrix diag (β o v) F are one about βLCompany
Continuous differentiable function, it is possible to further obtain the derivative of the function (referring to Can Kaowenxian [3][4])：
Wherein x=s [x1x2…xL]TWith y=s [y1y2…yL]TThe right Perron- of representing matrix diag (β o v) F respectively
Frobenius feature vectors and left Perron-Frobenius feature vectors.In addition, matrix diag (β o v) F is irreducible non-
It is negative, so x and y are positive vectors (referring to Can Kaowenxian [7]).Therefore,And g (βL)=ρ(diag(βо
V) F) it is about βLStrictly monotone increasing, it means that the supremum of achievable SINRIt is determined by following formula：
That is,(symbol sup { } indicates the supremum of a set).It is further, it can be achieved that
The set of SINR can be rewritten as：
2. distributed algorithm
Theory is mended (referring to Can Kaowenxian [ using Perron;6]), equation (1) is equivalent to following formula
Thus,
This is the closure expression formula of a supremum that can be used for directly calculating the achievable SINR of detecting link.Pass through
By the both sides of equation (2) all multiplication by constants PL(it indicates the probe power of detecting link L), can obtain equivalent formula
Below, it is proposed that a kind of distributed algorithm and practical process carry out calculation equation (3).It is feasible in existing network
Under the conditions of, i.e. ρ (diag (βL-оvL-)FL-)<When 1 establishment,
It can prove that following formula sets up (specific proof procedure for simplicity, is omitted)
Wherein I is unit matrix, and
It indicates a well-designed iterator mechanism, and the transmission power of active link is updated according to the iterator mechanism.Deng
Formula (5) can be further rewritten as
Wherein, SIRL-(t)=[SIRl(t)SIR2(t)…SIRL-l(t)]T,
Indicate βL-And SIRL-(t) division of component direction is pressed between.
Equation (6) discloses a kind of distribution side for the transmission power calculating each active link during probe interval
Method, i.e.,
Wherein pl(t) and pl(t+1) it is respectively transmission powers of the active link l in moment t and moment t+1, βlExpression activity
The target SINR, SIR of link ll(t) local reception signal interference ratios of the expression active link l measured by moment t, l=1,2 ...,
L.All these physical quantitys can be obtained individually by link-local respectively.
Equation (4) is substituted into equation (3), is obtained
Can be reduced to for
Equation (9) shows that link L can be only achievable independently to calculate its by measuring local reception signal interference ratio
The supremum of SINR.
So far, it can sum up and meet the achievable S of the lower detecting link of ALP constraints just with local measurements to calculate
The distributed algorithm of the supremum of INR.Simultaneously as g (βL) about βLStrictly monotone increasing, then ifThen g
(βL)<1, this indicates that there are some power allocation schemes can ensure that the network after extension can meet the item of ALP as before
Part.Shown by the above analytical derivation：It is achievable for the detecting link L for wanting to be added a certain communication channel
The transmission power that the supremum of SINR is equal to each link in the preceding L-1 active link for having shared the communication channel is pressed
When converging to a corresponding constant respectively according to equation (7) iteration more new capital, the local reception letter measured by detecting link L is dry
Than when the target SINR of the detecting link is less than the supremum of achievable SINR, which has access to the communication
Network after channel and extension meets condition 1, and otherwise the detecting link can not access the communication channel.
Hereinafter, the method that distributed channel detection and sequential access according to the present invention are described in detail in conjunction with Fig. 2 to Fig. 7
And system.
Fig. 2 shows the signals detected according to the distributed channel of embodiment of the present invention with the system 200 of sequential access
Figure.As shown in Figure 2, system 200 includes that (L is positive integer and L> to L-1;2) active link shares same public wireless letter
Road 3, each active link include a pair of corresponding transmitter (1-1 ..., 1-l ..., 1-（)) and receiver (2-1 ..., 2- L-1
L ..., 2-（L-1)).System 200 further includes a new communication link L, attempts access to the common radio channel 3, with
The L-1 active link is transmitted on this channel simultaneously.Hereinafter, in the distributed channel detection phase, by the new communication
Link L is also referred to as " detecting link L ".
Fig. 3 shows the flow of the method 300 according to the detection of the distributed channel of embodiment of the present invention and sequential access
Figure.Here, method 300 is preferably described in conjunction with the frame assumption diagram of Fig. 4.
Fig. 4 show according to the distributed channel of embodiment of the present invention detection and sequential access system employed in when
Between frame structure schematic diagram.As shown in Figure 4, which is made of 3 continuous time intervals, is referred to as between detection
Every, power optimization interval and transmission intercal, each interval includes several time slots or moment, hereinafter referred to as moment t, moment t again
+ 1, moment t+2 etc..For a detecting link (i.e., it is desirable to the new communication link for sharing channel be added), visiting
Survey interim transmission detectable signal, if it is determined that the shared channel can be added in the detecting link, then at power optimization interval
Period executes power optimization process together with other active links, and hereafter each active link according to the work(after power optimization
Rate configuration carries out data transmission during transmission intercal.
In order to illustrate only the L-1 active link and the spy during probe interval preferably compared with Fig. 1, in Fig. 3
Surveyor's chain road executes the schematic diagram of detection process jointly.As shown in Figure 3, method 300 includes the following steps：
The transmitter of every active link l (l=1,2 ..., L-1) is in t moment respectively with respective transmission power pl(t) to
Corresponding receiver sends signal (step S1), and the transmitter with stylish detecting link L is with constant transmission power pL(t)=PL
To its receiver emission detection signal (step S2).
Here, pl(t) can be that every active link l is emitted according to transmission power rule before, pL（t）=PL
Can be the acceptable arbitrary transmission powers of link L.
Without loss of generality, t moment is usually defined as t=0.It will be appreciated by those skilled in the art that the detection
Journey can start at any time.
Next, in step S3, the receiver of every active link l determines that active link l believes in the reception of t moment respectively
Dry ratioNumerical value, and by the numeric feedback of the signal interference ratio SIRl (t) to the transmitting of active link l
The gain of the channel of receiver of machine, wherein the Glk expression from the transmitter of active link k to active link l, k, l=1,2 ...,
L-1, as k=L, Glk=GlL, indicate the gain of the channel of the receiver from the transmitter of detecting link L to active link l.
In step S4, signal interference ratio SIR is based in the transmitter of t moment, every active link ll（T) numerical value and activity chain
The target Signal to Interference plus Noise Ratio β of road llTo update transmitter at next moment
The transmission power p of t+1l(t+1), and in moment t1 with updated transmission power pl(t+1) to corresponding receiver
Send signal.
Here, the transmitter of every active link l is believed according to the target of signal interference ratio SIRl (t) and active link l dry respectively
It makes an uproar and compares βlBetween ratio come update transmitter the t+1 moment transmission power pl(t+1), it is shown below：
Next, every active link l is iteratively repeated implementation steps S3 and S4 until signal interference ratio according to t=t+1 modes
SIRl(t) numerical stability (step S5), such as converge to a constant.
As the signal interference ratio SIR of every active link ll(t) when numerical stability, the receiver of detecting link L determines that it connects
Receive signal interference ratioNumerical value, calculate the supremum of its achievable Signal to Interference plus Noise RatioAnd it is fed back to
The transmitter (step S6) of detecting link L, wherein GLkIndicate the receiver from the transmitter of active link k to detecting link L
The gain of channel, k=1,2 ..., L-1, as k=L, GLk=GLL, indicate from the transmitter of detecting link L to detecting link L
Receiver channel gain.
In one implementation, the supremum of the achievable Signal to Interference plus Noise Ratio of detecting link is equal in L-1 active link
The local letter of measured detecting link L is dry when the transmission power of each link all stablizes (such as converging to corresponding constant)
Compare SIRL(t), i.e.,
In step S7, the transmitter of detecting link L is by the supremum of the achievable Signal to Interference plus Noise Ratio calculatedWith its mesh
Mark Signal to Interference plus Noise Ratio βLIt is compared, to determine whether detecting link L has access to the shared channel.
As the target Signal to Interference plus Noise Ratio β of detecting link LLLess than the supremum of achievable Signal to Interference plus Noise RatioWhen (step S7's
Comparison result is "Yes"), determine that detecting link L has access to the channel (step S8).
Otherwise, as the target Signal to Interference plus Noise Ratio β of detecting link LLMore than or equal to the supremum of achievable Signal to Interference plus Noise Ratio
When (comparison result of step S7 be "No"), determine that detecting link L cannot access the channel (step S8 ').
In one implementation, step S3 to step S5 is synchronously implemented, and step S6 is also same to step S5 with step S3
Implement on step ground.
In addition, in a kind of embodiment of replacement, just held when the transmission power of L-1 active link is all stablized
Row step S6 measures detecting link L's to determine the supremum of the achievable SINR of detecting link L in each moment t
Local reception signal interference ratio approaches value as the supremum of achievable SINR, and in each moment t by the value of approaching and detection
The target SINR of link L is compared.So far, only pass through the local measurement of each active link and detecting link L, detecting link
Whether L can be autonomously decided on can be added the shared channel.When detecting link L is determined to access the shared channel,
The shared channel can be added, become a new active link.When detecting link L determinations cannot access the shared channel,
It, which is automatically stopped, sends signal and exits transmission.
Further, when the shared channel is added in detecting link L, become the shared channel a new active link it
Afterwards, L all active links can execute next power optimization process together.Due to g (βL) about βLStrictly monotone is passed
Increase, then ifThen g (βL)<1, this indicates to ensure the network energy picture after extension there are some power allocation schemes
Meet the condition of ALP as before.Back to back power optimization interval is exclusively used in seeking eligible 1 power configuration.It can be with
Different distributed power optimization algorithms is selected to realize.For example, using a kind of famous distributed power control algorithm (referring to ginseng
Examine Wen Xian [5]) come obtain so that total transmission power minimize and power distribution.
Step S9：The receiver of each active link l (l=1,2 ..., L) independently measures local Signal to Interference plus Noise Ratio SINRl
(t) and it is fed back to its transmitter, the receiver of each active link l (l=1,2 ..., L) independently updates according to the following formula
Its transmission power：
Until SINRl(t) until (l=1,2 ..., L) stablizes (such as converging to corresponding constant).
Here, in the beginning at power optimization interval, each active link can be emitted with arbitrary acceptable power,
And the transmission power at the end of being not limited to probe interval.
Hereafter, every active link l (l=1,2 ..., L) is to be not less than pl(t) power transmission signal.At this point, every work
The SINR of dynamic link l (l=1,2 ..., L) is not less than respective target SINR β respectivelyl。
(i.e. as minimum total transmission power) prioritization scheme, above-mentioned distributed algorithm energy
Enough converge on one group of power configuration p#, and the Signal to Interference plus Noise Ratio that is obtained of each active link in the network after extending is respectively etc.
In its desired value SINRl(p#)=βl, l=1,2 ..., L.
Network after extension, which uses, meets p ' >=p#Power allocation scheme p ' when, whole network can meet no work(
Requirement, that is, condition 1 of ALP under rate constraints.
Next, a kind of distributed channel detection without under power constraints of description and sequential access (DISCO-
SEA) the specific implementation mode of system.
Fig. 5 shows the channel of the system 500 according to the detection of the distributed channel of embodiment of the present invention and sequential access
The schematic diagram of configuration.The system 200 of system 500 and Fig. 2 has no essential distinction, is only formally to additionally illustrate every chain
Feedback channel between the transmitter and receiver on road (active link and detecting link), such as the reference numeral 4-1 ... in Fig. 5,
Shown in 4-l ..., 4-L.
It is appreciated that in practical applications, the link in the system 200 of Fig. 2 and the system 500 of Fig. 5 can be used for 3G
The CDMA links of network are used for the macrocellular link and microcellulor link (such as in the case of cell) of isomery cellular system, are used for
The main link and secondary links of cognitive radio system, or the D2D links for terminal direct connection communication (D2D) system and bee
Any one in nest link.
Fig. 6 shown in the form of function module respectively according to the transmitter 1-l of the active link l of embodiment of the present invention and
The signal of the structure (l=1,2 ..., L-1) of receiver 2-l and the structure of the transmitter 1-L and receiver 2-L of detecting link
Figure.
As shown in Figure 6, the transmitter 1-l of active link l includes mainly that Power Amplifier Unit 5-l and power update are single
The receiver 2-l of first 6-l, active link l include mainly receiving unit 11-l and local SIR estimation device unit 10-l.Detect chain
The transmitter 1-L of road L includes mainly transmitter unit (not shown) and access controller unit 7-L, the reception of detecting link L
Machine 2-L includes mainly receiving unit 11-L and local SIR estimation device unit 10-L.
For the transmitter 1-l of active link l, power updating unit 6-l is used for from associated with transmitter 1-l
Receiver 2-l receives the local SIR of measured active link l, and according to the target SINR of active link l and is received
Local SIR updates its transmission power；Power Amplifier Unit 5-l is used to transmission power being adjusted to updated transmission power
To be emitted.Wherein power updating unit 6-l iteration updates its transmission power, until the local SIR of active link l is stabilized to
Only.
In one implementation, as described above, power updating unit 6-l updates its transmission power according to the following formula：
Wherein, pl(t) and pl(t+1) it is respectively transmission powers of the active link l in moment t and moment t+1, βlIt indicates to live
The target SINR, SIR of dynamic link ll(t) local SIRs of the active link l measured by moment t is indicated.
For the receiver 2-l of active link l, receiving unit 11-l is for receiving associated transmitter 1-l institutes
Interference signal caused by the data-signal and detecting link L of transmission and other active links；Local SIR estimation device unit
10-l is used to estimate according to received data signal and interference signal the local SIR of active link l, and is fed back to phase
The transmitter 1-l answered.Wherein local SIR estimation device unit 10-l persistently calculates local SIR, until the local SIR calculated is steady
It is set to only.
For the transmitter 1-L of detecting link L, transmitter unit is used to send detectable signal with constant emission power；
Access controller 7-L is used to calculate the achievable SINR's of detecting link L according to the local SIR that receiver 2-L is calculated
True boundary, and when the target L of detecting link L is less than the supremum of the achievable L calculated, determine detecting link L energy
Enough access the channel.
For the receiver 2-L of detecting link L, receiving unit 11-L for receive associated transmitter 1-L with
Interference signal caused by the detectable signal and L-1 active link that constant emission power is sent；Local SIR estimation unit
10-L estimates the local SIR of detecting link L for the detectable signal and interference signal according to being received, and will be estimated
Local SIR feeds back to associated transmitter 1-L.Wherein local SIR estimation unit 10-L persistently calculates the local of detecting link L
SIR, until the local SIR of L-1 active link stablizes.
That is, the transmitter 1-L and receiver 2-L mono- of the transmitter 1-l and receiver 2-l of active link l and detecting link L
It rises and executes above in association with the method 300 described in Fig. 3.
In addition, above only with the transmitter 1-L of the transmitter 1-l of active link l and receiver 2-l and detecting link L and
Receiver 2-L describes its essential function module for executing the detection process described in Fig. 3, is omitted for executing spy
It is unnecessary or be not required to the function module being especially described in detail for survey process.
For example, being also possible to respectively include memory 8 in transmitter 1-l and 1-L, the target for storing each link
SINR.In another example being also possible to respectively include local SINR estimators (Fig. 7 as described below in receiver 2-l and 2-L
Shown in local SINR estimators 9), for estimating the local reception SINR of corresponding link in the power optimization stage.
Description above in association with Fig. 6 progress is only the angle from the different function during detection process to active link l
It is described with the transmitter and receiver of detecting link L.However, in fact, in practical applications, active link l and spy
Surveyor's chain road L is typically indiscriminate for its hardware configuration, in order to manufacture.For example, Fig. 7 is shown according to the present invention
Embodiment for distributed channel detection and sequential access link transmitters 1-l and link receiver 2-l (l=1,
2 ..., L) structural schematic diagram.
The present invention proposes a kind of side of the distributed channel detection and sequential access (DISCO-SEA) of not power constraint
Method and system.The DISCO-SEA schemes proposed can rely solely on single iterative process and obtain the upper true of achievable SINR
Boundary.In channel detection interim, each active link is using identical rule of iteration according between target SINR and current SIR
Ratio update its transmission power, this succinct rule is just enough for the link of all dispersions of distributed coordination in terms of
The theoretical exact value for calculating the supremum of the achievable SINR of detecting link, without central decision device or synergist.Each chain
Road only obtains local information during single iterative process.When iteration convergence, the reception SIR that detecting link obtains is exactly equal to
The supremum of its achievable SINR.Then, which can be by the way that the supremum to be compared with its target SINR
Independently decide whether to access.
Using the solution of the present invention, can advantage is obtained that：
First, the DISCO-SEA schemes proposed provide a kind of distributed channel detecting strategy and come just with single
The supremum of the achievable SINR of iterative process Accurate Prediction detecting link.The method and system of DISCO-SEA utilizes detection chain
The supremum of the achievable SINR in road features the possibility and ability of the space reuse of new link.This characterizing definition is at certain
It ensure that the overall situation (Pareto) optimality of space reuse in kind meaning.It is excellent that this prediction network critical point ability is conducive to rate
The realization of change, and it is significantly better than traditional detection method, they are mainly using the method for directly verifying feasibility condition.
Second, the DISCO-SEA schemes proposed realize online non-intrusive detection and access.This scheme to visit
Surveyor's chain road can be with arbitrary firm power emission detection signal, while active link is still sent out in entire channel detection interim
Send data-signal.This detection behavior is non-emulative, but mild close friend.More specifically, the power of detectable signal
It can be set to very small such that due to interference caused by detecting link does not interfere with the normal data transmission of active link.
In addition, proposed DISCO-SEA schemes provide a kind of effective future state for observing the network after extension rather than see
Examine the mode of the current state of existing activity network.
Third, the DISCO-SEA schemes proposed can be obtained just with less calculating cost and control overhead compared with
High accuracy, the extension of the large scale suitable for network is to obtain better space reuse.Proposed distributed method
It is only necessary to O (LTc) magnitude algorithm calculations at the supremum for calculating achievable SINR originally, wherein TcIndicate convergence or knot
Iterations needed for beam detection.It is to feed back O (LT by L local feedback channel to need the total signaling amount fed backc) magnitude
Signaling amount.On the contrary, the method for Xiao et al. needs O (L (Tc1+Tc2)) algorithm calculations of magnitude calculate supremum, letter at original
It is also o (L (T to enable the magnitude of expensec1+Tc2)), because it needs two iterative process.On the other hand, the scheme of Xiao et al. is adopted
With two iterative process, more error in numerical calculation may be introduced in result of calculation, and the present invention is only with single
Iterative process can be avoided as much as these errors.
4th, the DISCO-SEA schemes proposed ensure that the good backwards compatibility with existing wireless system.
The power renewal process used in DISCO-SEA schemes is similar in existing wireless system and is adopted extensively as a kind of standard technique
Distributed power control mechanism.Also, the practical realization of DISCO-SEA schemes only relates to the local measurement of SINR and SIR,
This is also the common function that existing business communication system has.It is all these all to be upgraded to from existing business system
DISCO-SEA systems are more prone to, and can be realized only by the modification newer rule of power.For example, can be by adopting
Current monolayer honeycomb system is easily extended to the two layer system with higher space reuse with DISCO-SEA schemes.
Hereinafter, showing some performance comparisons carried out with the scheme of Xiao by emulation experiment.The comparison shows this
The advantages of scheme of the invention relative to Xiao.It is described in conjunction with Fig. 2 and Fig. 5.In the power control based on SINR, due to fast
Effect caused by speed decline is always assumed that and can be balanced out by power policy or by diversity technique.Therefore, interference letter
The path gain G in roadijIt can be modeled as：
Wherein dijIt is the space length between the transmitter of link j and the receiver of link i, decay factor AijIt simulates
Changed power caused by shadow effect.Assuming that all AijIt is the random change of independent lognormal (log-normal) distribution
Amount, mean value 0dB, logarithm variance are 8dB.Following table 1 lists simulation parameter in detail.Empirical cumulative is distributed in order to obtain
Function (CDF) curve independently realizes 3118 experiments under the identical condition of convergence, and experiment every time is terminated using identical criterion
Iterative process.
1 simulation parameter of table
Fig. 8 is from the angle changing rates of the iterations computation complexity of channel detection.The algorithm of Xiao is than proposed
The complexity higher of DISCO-SEA schemes because its perform twice iterative process to obtain the supremum of achievable SINR.
The possibility that the additional times of iteration are more than 10 is 30%, and the possibility for being more than 100 is 2%.In addition, iterative process is to meter twice
It calculates result and introduces more numerical errors.Fig. 9 compares the computational accuracy of channel detection from accidentally absolute value of the difference meaning.It can
To find out, numerical error that the scheme of Xiao generates is bigger than the DISCO-SEA schemes that are proposed.Performance result of the comparison table
Bright DISCO-SEA schemes proposed by the invention are more suitable for distributed channel detection.
In addition, the present invention also gives the example of network extension by emulation experiment, one is simulated comprising in 6
The symbiotic system of portion's link.Detailed simulation parameter is as shown in following table 2.In emulation experiment, link sequence as shown in Figure 4
Access common radio channel with passing through.But probe interval and the length at power optimization interval do not limit and fixed, therefore can be with
The constringency performance of DISCO-SEA schemes proposed by observing.In addition, not embodying transmission intercal in the emulation.Numerical simulation is remembered
SINR and the evolution process of transmission power are recorded.
The simulation parameter of 2 network of table extension
| Parameter | Numerical value |
| G11 | 7.83599369030428e-5 |
| G21 | 2.61959672264312e-6 |
| G31 | 6.05423846866248e-8 |
| G41 | 1.61312821850499e-7 |
| G51 | 2.53591570684599e-8 |
| G61 | 2.85270368616920e-5 |
| G12 | 2.99110190341766e-07 |
| G22 | 0.00258489068590052 |
| G32 | 5.75852363153526e-09 |
| G42 | 1.26321643646521e-06 |
| G52 | 3.98159379586479e-08 |
| G62 | 3.00838152847897e-08 |
| G12 | 9.02353779224197e-08 |
| G23 | 1.13670108667887e-06 |
| G33 | 0.000110386622546271 |
| G43 | 9.61923361992726e-09 |
| G53 | 1.22144731254783e-08 |
| G63 | 1.91572310425434e-08 |
| G14 | 3.22797112458184e-09 |
| G24 | 5.94288424915333e-09 |
| G34 | 1.67815602310423e-08 |
| G44 | 0.00106269697777194 |
| G54 | 8.26291731004864e-07 |
| G64 | 1.53564176532745e-05 |
| G15 | 5.33906803955939e-07 |
| G25 | 3.22373796227997e-09 |
| G35 | 1.48153842067814e-05 |
| G45 | 2.04267283233137e-06 |
| G55 | 0.000341453321458548 |
| G65 | 1.44090725641562e-06 |
| G16 | 7.80587350435326e-06 |
| G26 | 1.09925463055190e-08 |
| G36 | 2.79103967682520e-08 |
| G46 | 2.16176138152294e-08 |
| G56 | 1.43530542466603e-07 |
| G66 | 0.000129075441637069 |
| βi | 20+(i-1)2dB |
| ni | -23dBm |
| Probe power | 20dBm |
Supremum of the table 3 without achievable SINR in the case of power constraint
The simulation result of the supremum of achievable SINR for this sequential access network can be obtained from table 3.
It can verify：This indicates that the distributed channel that proposed DISCO-SEA schemes are provided is visited
Survey process can be with the supremum of the achievable SINR of the new link of Accurate Prediction.The supremum of link 2,3,4 is more than them respectively
Target SINR, therefore these links are allowed to access common signal channel and realize their SINR targets.However, link 5
Supremum is less than its target SINR.In emulation experiment, link 5 allows to be less thanThe SINR of dB rather than its
The target SINR of 28dB accesses common signal channel.In addition, the supremum of link 1 is infinite due to not having power and interference constraints
Greatly, and the supremum of link 6 is equal to 0 (being expressed as-inf with dB) because as L=6, ρ (diag (βL-оvL-)FL-)≥1。
Figure 10 shows that a kind of embodiment according to the present invention is realized in distributed channel detection and sequential access system
SINR evolution process.The differentiation of corresponding transmission power is shown in FIG. 11.Solid line and dashed circle are respectively used to indicate
Detection and power optimization interval.In fig. 11, link 3 has detected the activity network for including link 1 and link 2, and predictsDue toLink 3 is automatically accepted and enters power optimization interval.After distributed power optimization process, chain
Road 1,2,3 has reached feasible power distribution to realize their target SINR respectively and so that total transmission power is minimum
Change.It is also in this way for link 4.
Later, link 5 detects the activity network for including link 1,2,3,4, and predictsDue toLink 5 with
SINR(wherein ε be arbitrarily small positive number) is automatically accessed and ingoing power optimization interval.Optimized in distributed power
After journey, network is very close to critical point, and SINR that link 1,2,3,4 is realized develops into their target SINR respectively, and chain
Road 5 realizes one and approachesPractical SINR it is horizontal.
During probe interval, the SINR Fast Convergents (at least with geometric progression) of active link and detecting link arrive equation
(2) exact value determined by.Even for ρ (diag (βL-оvL-)FL-The extreme case of) >=1, the convergence of SINR can also be with
Theoretical mode Strict Proof (omits its proof procedure) for brevity.
Therefore, each link has very strong robustness, can individually terminate its work(when SINR converges to a constant
Rate iteration renewal process.
Proposed DISCO-SEA schemes, which allow the transmitter newly entered to be sent during probe interval, has arbitrary constant
The detectable signal of power, while each active link is according to designed mechanism, based on the target SINR of its own and local SIR
Between ratio update its transmission power.When iteration convergence, it is only necessary to measure the local of oneself for the receiver of new link
SIR is exactly equal to the supremum (supremum) of the achievable SINR of detecting link.Immediately, new link is by will be on this
True boundary is compared to individually decide whether to access with its target SINR.If the latter is less than the former, new link is identified as
It non-intrusive link and can on-line manner be accommodated by all active links.Otherwise, it automatically exits from.Then, distributed work(
The optimal power configuration to the link of all receiving is sought at the interval of rate optimization so that their SINR and ALP requires consistent.
During two of channel detection and power optimization, each link is only responsible for measuring matter associated with its respective link
It measures, information is not exchanged between link.These distributed natures make proposed channel detection and access scheme automatic and flexible,
This so that can subsequently be superimposed link as much as possible on the common channels enables to the case where not changing network management
Under reuse as much as possible space and utilize channel.
Significantly, proposed DISCO-SEA schemes provide a kind of cognitive ability for network, only rely upon logical
Single iterative process and local measurements are crossed to calculate the global supremum of achievable SINR, wherein achievable SINR's is upper
True boundary characterizes the efficiency of the space reuse of new link in some sense.This cognitive ability can be a large amount of wireless application
Public basic methods, including user's pairing, cell scan and association and channel sensing are provided.
In one or more exemplary designs, this can be realized with hardware, software, firmware or their arbitrary combination
The application function.For example, if realized with software, it can be using the function as one or more instruction or code
May be stored on the computer-readable medium, or as on computer-readable medium one or more instructions or code transmit.
Each unit of device disclosed herein can be realized using discrete hardware components, can also integrally be realized
One hardware component, on processor.For example, general processor, digital signal processor (DSP), special integrated electricity can be used
It is road (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete
Hardware component is realized or is executed in conjunction with various described in the disclosure for executing the arbitrary combination of function as described herein
Illustrative logical block, module and circuit.
Those of ordinary skill in the art should also understand that, the various illustrative logics described in conjunction with embodiments herein
Electronic hardware, computer software or combination may be implemented into block, module, circuit and algorithm steps.For example, if in terms of
Calculation machine software realizes connector as described herein, can realize the computer software known to any of or future
On household equipment with network-connectivity, such as set-top box, Home eNodeB etc..If as described herein to realize with hardware
The connector can then be realized and be independent hardware device, or is integrated in known to any of or future by connector
On household equipment, such as set-top box, Home eNodeB etc..
The above description of the disclosure is for enabling any those of ordinary skill of this field to realize or use the present invention.It is right
For those of ordinary skill in the art, the various modifications of the disclosure will be apparent from, and generality defined herein
Principle can also be applied to other deformations in the case of without deviating from the spirit and scope of the disclosed invention.Therefore, the present invention is simultaneously
It is not limited to example as described herein and design, but it is consistent with the widest scope of principle disclosed herein and novel features.
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Claims (12)
1. a kind of method carrying out distributed channel detection in the wireless network, wherein in the channel, existing L-1 items are lived
Dynamic link, L is positive integer and L>2, every active link includes a pair of corresponding transmitter and receiver, and detecting link L attempts
The channel is accessed, to transmit signal on that channel simultaneously with the L-1 active link, the method works as the detection
Link L is executed when attempting to join the channel, is included the following steps：
S1：The transmitter of every active link l is in t moment respectively with respective transmission power pl(t), l=1,2 ..., L-1, to right
The receiver answered sends signal；
S2：The transmitter of the detecting link L is with constant transmission power pL(t)=PLTo its receiver emission detection signal；
S3：In t moment, the receiver of every active link l determines the statistic SINR of the active link l respectivelyNumerical value, and by signal interference ratio SIRl(t) numeric feedback to active link l transmitter,
Middle GlkIndicate the gain of the channel of the receiver from the transmitter of active link k to active link l, k, l=1,2 ..., L-1 work as k
When=L, Glk=GlL, indicate the gain of the channel of the receiver from the transmitter of the detecting link L to the active link l；
S4：It is based on the signal interference ratio SIR in the transmitter of t moment, every active link ll(t) numerical value and the active link l
Target Signal to Interference plus Noise Ratio βlTo update the transmission power p in next moment t+1 of the transmitterl（T+1), and in moment t+
1 with updated transmission power pl（T+1) signal is sent to corresponding receiver；
S5：Every active link l is iteratively repeated according to t=t+1 modes implements the step S3 and S4 until the signal interference ratio
SIRl(t) numerical stability；
S6：The receiver of the detecting link L determines the statistic SINR of the detecting link L's
Numerical value calculates the supremum of the achievable Signal to Interference plus Noise Ratio of detecting link LAnd fed back to the transmitting of the detecting link L
Machine, wherein GLkIndicate the gain of the channel of the receiver from the transmitter of active link k to detecting link L, k=1,2 ..., L-
1, as k=L, GLk=GLL, indicate the channel of the receiver from the transmitter of the detecting link L to the detecting link L
Gain；
S7：The transmitter of the detecting link L is by the supremum of the achievable Signal to Interference plus Noise RatioWith its target Signal to Interference plus Noise Ratio βL
It is compared, whether the channel is had access to the determination detecting link L；And
S8：As the target Signal to Interference plus Noise Ratio β of the detecting link LLLess than the supremum of the achievable Signal to Interference plus Noise RatioWhen, really
Fixed detecting link L has access to the channel.
2. the method as described in claim 1, wherein in step s 4, every active link l in the L-1 active link
Transmitter respectively according to the following formula come update the transmitter the t+1 moment transmission power pl(t+1)：
3. the method as described in claim 1, wherein the supremum of the achievable Signal to Interference plus Noise Ratio of the detecting linkEqual to institute
State the local signal interference ratio of measured detecting link when the transmission power of each link in L-1 active link is all stablized
SIRL(t)。
4. according to the method described in claim 1, it is characterized in that, the step S8 further comprises：When described achievable
The supremum of Signal to Interference plus Noise RatioTarget Signal to Interference plus Noise Ratio β less than or equal to the detecting link LLWhen, the hair of the detecting link L
The machine of penetrating determines that the detecting link L automatically stops sending signal, does not access the channel and exits transmission.
5. method as defined in claim 1, which is characterized in that the step S3 to the step S5 is synchronously implemented,
And the step S6 is also synchronously implemented with the step S3 to the step S5, wherein in the step S6, repeatedly
Determine the local reception signal interference ratio SIR of the detecting link LL(t) numerical value feeds back to the transmitter of the detecting link L, and
Supremum as the achievable Signal to Interference plus Noise Ratio of detecting link LApproach value, with its target Signal to Interference plus Noise Ratio βLIt is compared, with
Determine whether the detecting link L has access to the channel.
6. according to the method described in claim 1, when the step S8 determines that the detecting link has access to the channel,
The detecting link L, which accesses the channel, becomes another active link, and the method further includes following steps after step s8：
S9：The transmitter of all active links determines respective transmission power, so that the Signal to Interference plus Noise Ratio of every active link point
It Bu little Yu not respective target Signal to Interference plus Noise Ratio βl。
7. a kind of link of aided detection in the wireless network carries out the communication link transmitter of distributed channel detection, wherein described
Communication link transmitter with corresponding communication link receiving mechanism at an active link in the wireless network, in the nothing
In gauze network, has L-1 active link and share the channel, L is positive integer and L >=2, and the detecting link attempts and the L-
1 active link shares the channel, and the communication link transmitter includes：
Power updating unit, it is measured for being received from communication link receiver associated with the communication link transmitter
The local signal interference ratio of the active link, and it is dry according to the target Signal to Interference plus Noise Ratio of the active link and the local letter received
Than updating its transmission power；
Power Amplifier Unit, for transmission power to be adjusted to updated transmission power to emit,
The wherein described power updating unit iteration updates its transmission power, until the local signal interference ratio of the active link stabilizes to
Only.
8. link transmitters as claimed in claim 7, wherein the power updating unit updates its transmission power according to the following formula：
Wherein, pl（And p t)l（T+1) it is respectively transmission powers of the active link l in moment t and moment t+1, βlIndicate activity chain
The target Signal to Interference plus Noise Ratio of road l, SIRl(t) local signal interference ratios of the active link l measured by moment t is indicated.
9. a kind of link of aided detection in the wireless network carries out the communication link receiver of distributed channel detection, wherein described
Communication link receiver with corresponding communication link trigger mechanism at an active link in the wireless network, in the nothing
In gauze network, has L-1 active link and share the channel, L is positive integer and L>2, the detecting link attempts and the L-1
Active link shares the channel, and the communication link receiver includes：
Receiving unit, for receive data-signal transmitted by associated communication link transmitter and the detecting link and
Interference signal caused by other active links；And
Local signal interference ratio estimation unit, the local for estimating the active link according to received data signal and interference signal
Signal interference ratio, and it is fed back to corresponding communication link transmitter,
The wherein described local signal interference ratio estimation unit persistently calculates local signal interference ratio, until the local signal interference ratio calculated stabilizes to
Only.
10. it is a kind of in the wireless network carry out distributed channel detection link transmitters, the link transmitters with it is corresponding
Link receiver constitutes a detecting link in the wireless network, wherein having L-1 item activities in the wireless network
One channel of link sharing, L are positive integer and L>2, every active link includes a pair of corresponding transmitter and receiver, the spy
Surveyor's chain road test figure shares the channel with the L-1 active link, and the link transmitters include：
Transmitter unit, for sending detectable signal with constant emission power；
Access controller, it is achievable that the local signal interference ratio for being calculated according to the link receiver calculates the detecting link
The supremum of Signal to Interference plus Noise Ratio, and when the target Signal to Interference plus Noise Ratio of the detecting link is less than the achievable Signal to Interference plus Noise Ratio calculated
Supremum when, determine that the detecting link has access to the channel.
11. it is a kind of in the wireless network carry out distributed channel detection link receiver, the link receiver with it is corresponding
Link transmitters constitute a detecting link in the wireless network, wherein having L-1 item activities in the wireless network
One channel of link sharing, L are positive integer and L >=2, and every active link includes a pair of corresponding transmitter and receiver, described
Detecting link attempts to share the channel with the L-1 active link, and the link receiver includes：
Receiving unit, the detectable signal and the L- sent with constant emission power for receiving associated link transmitters
Interference signal caused by 1 active link；
Local signal interference ratio estimation unit estimates that the local of the detecting link is believed according to the detectable signal and interference signal that are received
Dry ratio, and estimated local signal interference ratio is fed back into associated link transmitters,
The wherein described local signal interference ratio estimation unit persistently calculates the local signal interference ratio of the detecting link, until the L-1 items
Until the local signal interference ratio of active link is stablized.
12. a kind of system of distributed channel detection and sequential access, including：
At least one active link, each in the active link include leading to as described in any bar in claim 7-8
Believe link transmitters and communication link receiver as claimed in claim 9;And
Detecting link, the detecting link include link transmitters as claimed in claim 10 and as claimed in claim 11
Link receiver,
Wherein, whenever a new detecting link attempt access to the channel with all existing active links simultaneously described
When channel signal, implement method according to any one of claim 1 to 6, until the channel is no longer able to
Until accessing new detecting link.
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| CN103098532A (en) * | 2010-09-13 | 2013-05-08 | 高通股份有限公司 | Method, apparatus and computer program product to facilitate use of lte channelization structures and waveforms for peer-to- peer communications |
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| CN103098532A (en) * | 2010-09-13 | 2013-05-08 | 高通股份有限公司 | Method, apparatus and computer program product to facilitate use of lte channelization structures and waveforms for peer-to- peer communications |
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