CN109639328A - A kind of power distribution system and method for combined relaying and day line options - Google Patents
A kind of power distribution system and method for combined relaying and day line options Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0426—Power distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3911—Fading models or fading generators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
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Abstract
This disclosure relates to the power distribution system and method for a kind of combined relaying and day line options, comprising: include: MRA relay node RrWith two communication source node A, B, described communication source node A, B and relay node RrThe antenna number of configuration is respectively Ma、MbAnd Mr, the jth root antenna of the communication source node A, the l root antenna for communicating source node B are used for respectively simultaneously to relay node RrKth root antenna transmission known to pilot frequency information, the relay node RrFor obtaining channel gain and analysis between communication source node A, B and its each antenna, after carrying out day line options optimal in optimal relaying and each node, information exchange is completed.The invention has the advantages that having fully considered mutual movement and the imperfect channel state information of practical communication environment interior joint, it is more suitable for practical communication system；Frequency spectrum resource is not only efficiently utilized, and system break probability can be made to optimize, the performance of communication system is effectively promoted.
Description
Technical field
The present invention relates to the power distribution systems and method of a kind of combined relaying and day line options.
Background technique
With spreading for radio multimedium, wireless communication has penetrated into the various aspects in people's life, when becoming new
The essential exchange way of generation society.One difficult point of wireless communication is the uncertainty of its channel, is different from wire transmission,
The channel of wireless communication is highly prone to interfere the influence with noise and the factors such as path loss and multipath fading in environment.Channel
Decline is the propagation loss of wireless signal on the communication link.In mobile communications, there is only multipath transmisstions, when existing simultaneously
Become characteristic, that is, time-varying fading channels.
In cooperation communication system, can usually have it is multiple can candidate relay for users to use, traditional more relayings joint
Although the communication mode of cooperation can make system obtain diversity gain, power and spectral overhead burden are increased simultaneously.Research
Show the performance that bidirectional relay system combination MIMO technology can be further improved link reliability, enhance system.Due to by
The constraint of this expense and hardware complexity, MIMO technology are limited in practical applications, and which has limited the hairs of MIMO technology
Exhibition, moreover, traditional average power allocation method system outage probability rate performance is poor.
Summary of the invention
Technical problem to be solved by the present invention lies in providing the power distribution method of a kind of combined relaying and day line options,
It has the advantages that specific energy is high, activation time is short.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of function of combined relaying and day line options
Rate distribution system characterized by comprising MRA relay node RrWith two communication source node A, B, described communication source node A, B
With relay node RrThe antenna number of configuration is respectively Ma、MbAnd Mr, jth root antenna, the communication source node B of the communication source node A
L root antenna for respectively while to relay node RrKth root antenna transmission known to pilot frequency information, the relay node
RrFor obtaining channel gain and analysis between communication source node A, B and its each antenna, optimal relaying and each section are carried out
In point after optimal day line options, information exchange is completed, wherein j=1,2 ... Ma, l=1,2 ... Mb, k=1,2 ... Mc, r=
1,2,…MR。
Another object of the present invention is to provide the power distribution method of a kind of combined relaying and day line options, feature exists
In, comprising:
Source node A jth root antenna, communication source node B l root antenna are communicated respectively simultaneously to relay node RrKth root day
Line transmits known pilot frequency information；
Relay node RrThe channel gain between communication source node A, B and its each antenna and analysis are obtained, is carried out optimal
Relaying and each node in after optimal day line options, complete information exchange, wherein j=1,2 ... Ma, l=1,2 ... Mb, k=
1,2,…Mc, r=1,2 ... MR。
Compared with prior art, the invention has the following beneficial technical effects:
It realizes simply, including MRA relay node RrWith two communications source node A, B, communicates source node A jth root antenna, leads to
Information source node B l root antenna is respectively simultaneously to relay node RrPilot frequency information known to kth root antenna transmission；Relay node RrIt obtains
The channel gain between communication source node A, B and its each antenna and analysis are taken, is carried out optimal in optimal relaying and each node
Day line options after, complete information exchange, fully considered practical communication environment interior joint it is mutual move and non-ideal letter
Channel state information, and it is not limited to the static and ideal channel state information communication scene of node, therefore the method for the present invention is more suitable
For practical communication system；Frequency spectrum resource is not only efficiently utilized compared with traditional constant power distribution method in the present invention, and
And system break probability can be made to optimize, the performance of communication system is effectively promoted.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the power distribution system of combined relaying and day line options of the invention；
Fig. 2 is the flow chart of the power distribution method of combined relaying and day line options of the invention；
Fig. 3 is the l-G simulation test figure of method shown in Fig. 2.
Specific embodiment
Below by specific embodiment, present invention is further described in detail, but these embodiments are only that citing
Illustrate, the scope of the present invention is not defined.
Please refer to Fig. 1, the power distribution system of a kind of combined relaying and day line options of the invention, comprising: MRA relaying
Node RrWith two communication source node A, B, described communication source node A, B and relay node RrThe antenna number of configuration is respectively Ma、Mb
And Mr, the jth root antenna of the communication source node A, the l root antenna for communicating source node B are used for respectively simultaneously to relay node Rr
Kth root antenna transmission known to pilot frequency information, the relay node RrFor obtaining communication source node A, B and its each antenna
Between channel gain and analysis, after carrying out day line options optimal in optimal relaying and each node, complete information exchange,
Middle j=1,2 ... Ma, l=1,2 ... Mb, k=1,2 ... Mc, r=1,2 ... MR。
In one embodiment, the relay node RrIt works under half-duplex mode with communication source node A, B.
Referring to figure 2., the power distribution method of a kind of combined relaying and day line options characterized by comprising
Step S101, communication source node A jth root antenna, communication source node B l root antenna are respectively simultaneously to relay node
RrPilot frequency information known to kth root antenna transmission；
Step S102, relay node RrThe channel gain between communication source node A, B and its each antenna and analysis are obtained,
After carrying out day line options optimal in optimal relaying and each node, information exchange is completed, wherein j=1,2 ... Ma, l=1,
2,…Mb, k=1,2 ... Mc, r=1,2 ... MR。
In one embodiment, the relay node RrObtain the channel between communication source node A, B and its each antenna
Gain and analyze include: relay node RrObtain optimal power contribution when being transmitted by different antennaeWith
It saves as a result, then calculating end-to-end signal-to-noise ratio γ (t) in t symbol period.
In one embodiment, further comprise: relay node RrCombined relaying is carried out using distributed clock method
With day line options.
In one embodiment, the distributed clock method includes: relay node RrTimer, the timing of setting are set
The inverse of the time corresponding maximum signal to noise ratio of relay node thus, i.e.,
In one embodiment, timingCorresponding antenna serial number (j, l, k) relay node pair thus
The optimal antenna serial number answered.
In one embodiment,Maximum relaying is optimal relay node.
In one embodiment, antenna optimal in optimal relaying and each node is carried out according to minimal disruption probability strategy
Selection.
As specific embodiment, the power distribution method of combined relaying of the invention and day line options includes:
Step 1: source node A jth root antenna, source node B l root antenna are respectively simultaneously to relay node RrKth root antenna
Transmit known pilot frequency information, relay node RrEstimate the channel gain between source node A, B and its each antenna, wherein j=
1,2,…Ma, l=1,2 ... Mb, k=1,2 ... Mc, r=1,2 ... MR。
Step 2: relay node RrOptimization problem is initially set up, best function when being transmitted by different antennae is calculated
Rate distributionWithIt saves as a result, then calculating end-to-end signal-to-noise ratio γ (t) in t symbol period.
Step 3: relay node RrCombined relaying and day line options are carried out using distributed clock technology.Relay node Rr
Timer is set, the inverse of the timing of the setting corresponding maximum signal to noise ratio of relay node thus, i.e.,This
When corresponding antenna serial number (j, l, k) the i.e. corresponding optimal antenna serial number of relay node thus.
Step 4: for all relay nodes,It is maximum to that is to say the relaying with the minimum timing time most
First to two source nodes and other relay node broadcasts relayings and optimal antenna sequence number value, it means that it has become chosen
Optimal relay node, the remaining relay node not being selected then enters wait state；
Step 5: optimal antenna serial number is { J, L, K, R } in relaying optimal at this time and each node, i.e., in system total work
Rate PTUnder conditions of limited, using minimal disruption probability as the combined relaying of the optimal power allocation scheme of optimization aim and day line selection
Selecting strategy can be expressed as follows:
Step 6: after completing day line options optimal in optimal relaying and each node, completing information exchange.
In one embodiment, referring to Fig.1, the time varying channel bidirectional relay system that the present invention uses comprising MRIn a
After with two communication source nodes A and B.Source node A, B and the antenna number of relay node configuration are respectively Ma、MbAnd Mr, and all half
It works under duplex mode.Source node A jth root antenna and relaying RrChannel gain between kth root antenna is denoted asChannel cascaded
Degree isSource node B l root antenna and relaying RrChannel gain between kth root antenna is denoted asChannel cascaded degree is
As specific embodiment, the present invention is according to combined relaying and day line selection in Fig. 1 time varying channel bidirectional relay system
The step of power distribution method selected, is as follows:
Step 1: establishing non-ideal CSI and time varying channel model.
Source node A jth root antenna, source node B l root antenna are respectively simultaneously to relay node RrKth root antenna transmission is
The pilot frequency information known, relay node RrEstimate the channel gain between source node A, B and its each antenna, wherein j=1,2 ...
Ma, l=1,2 ... Mb, k=1,2 ... Mc, r=1,2 ... MR。
(1a) time selective fading can be described by a variety of channel models, and first order autoregressive model portrays it
Accuracy is higher, makees channel simulation using it in this example, i.e.,
Wherein hl,a,i、hl,b,iI-th, i ∈ { 1,2 } the root antenna and relaying l, l=1 ... of source node A, B have been respectively represented,
The channel gain of link between M, k and k-1 represent two adjacent symbol periods,It is the variable of link
Component, ρl,s,i=J0(2πfcν/RsC), s ∈ { a, b } is the related coefficient of adjacent-symbol periodic channel gain, ρl,s,iTable when=1
Show that channel is static decline, J0() is first kind zero Bessel function, fcIt is carrier frequency, RsIt is symbol transmission rate,
C is the light velocity, and v is the relative velocity of two movement nodes.
The symbol block length of (1b) transmission is N, and since channel is time selective fading, each receiving node is only every
Estimate that corresponding channel, channel estimation model are on first symbol period of a symbolic blocks
WhereinIt is the channel estimation value of first symbol period (t=1),It is the letter of first symbol period
Channel estimation error coefficient, it is assumed thatWithIt is independent from each other, and
Then t-th of symbol period channel is represented by
Step 2: relay node RrOptimization problem is initially set up, best function when being transmitted by different antennae is calculated
Rate distributionWithIt saves as a result, then calculating end-to-end signal-to-noise ratio γ (t) in t symbol period.
(2a) establishes optimization problem P1:
Wherein Pa、PbAnd PrIt is the transimission power of source node A, B and relay node, P respectivelyTFor system overall transmission power
Maximum value, PoutIt (t) is the system break probability in t symbol period.
(2b) solving optimization problem P1, obtains PaAnd PbAbout PrExpression formula；
(2c) is by PaAnd PbAvailable one is brought in the objective function of optimization problem into about PrFunction f (Pr)。
(2d) is due to function f (Pr) derivation is more complicated, at this time with the Fibonacci method in linear search method to f (Pr) ask
Solve optimal solutionThen corresponding optimal power value is solvedWithThe specific steps of Fibonacci method are described below:
1): enablingK=1 and convergence precision ε > 0 calculate f (ω1) and f (φ1), wherein ω1
=a1+0.382(b1-a1), φ1=a1+0.618(b1-a1)。
2): determining | bk-ak| < ε whether be it is true, if it is true, then optimal solutionStop iteration.Such as
Fruit is vacation, then if f (ω1) > f (φ1), then step 3 is gone to, step 4 is otherwise gone to；
3): enabling ak+1=ωk, bk+1=bk, ωk+1=φkAnd φk+1=ak+1+0.618(bk+1-ak+1), calculate f
(φk+1) and go to step 5；
4): enabling ak+1=ak, bk+1=φk, φk+1=ωkAnd ωk+1=ak+1+0.382(bk+1-ak+1), calculate f
(ωk+1) and go to step 5；
5): enabling k=k+1, go to step 2.
Step 3: relay node RrCombined relaying and day line options are carried out using distributed clock technology.Relay node Rr
Timer is set, the inverse of the timing of the setting corresponding maximum signal to noise ratio of relay node thus, i.e.,This
When corresponding antenna serial number (j, l, k) the i.e. corresponding optimal antenna serial number of relay node thus.
Step 4: for all relay nodes,It is maximum to that is to say the relaying with the minimum timing time most
First to two source nodes and other relay node broadcasts relayings and optimal antenna sequence number value, it means that it has become chosen
Optimal relay node, the remaining relay node not being selected then enters wait state；
Step 5: optimal antenna serial number is { J, L, K, R } in relaying optimal at this time and each node, i.e., in system total work
Rate PTUnder conditions of limited, using minimal disruption probability as the combined relaying of the optimal power allocation scheme of optimization aim and day line selection
Selecting strategy can be expressed as follows:
Step 6: after completing day line options optimal in optimal relaying and each node, completing information exchange.
First stage: in t symbol period, source node A J root antenna, source node B L root antenna are respectively simultaneously with powerWithTo relay node RRK root antenna transmission useful information；
Second stage: relay node decodes information, and judges whether decoding is correct: by superposed signal if correct
Linear amplifying operation is carried out according to channel condition, with transmission powerMixed information is sent to source node A, B simultaneously, it is complete
At information exchange.
Effect of the invention can be described further by following emulation:
1) simulated conditions:
Assuming that all channel magnitudes all obey independent identically distributed time selectivity in CSI time varying channel bidirectional relay system
Cascade Rayleigh fading, and cascade degreeThe symbol block length N of transmissionsym=20, adjacent-symbol week
The correlation coefficient ρ of phase channel gaina=ρb=ρ=0.9999 (corresponding relative velocity v=40km/h),The noise variance of all nodes is equal to 1, carrier frequency fc=2.4GHz, symbol transmission rate Rs
=25ksps, node rate threshold value Rth=1bit/s/Hz, Ma=Mb=2, Mr=MR={ 3,4 }.
2) emulation content and result:
Under above-mentioned simulated conditions, using the method for the present invention and traditional constant power distribution method, respectively to non-ideal CSI when
The outage probability for becoming channel bidirectional relay system carries out emulation comparison, as a result as shown in Figure 3.Abscissa is the letter of system in Fig. 3
It makes an uproar than SNR, unit dB, ordinate is the outage probability of system.
As seen from Figure 3, compared with constant power distributes transmission plan, the optimal power allocation transmission plan that is mentioned is
Performance of uniting is obviously more advantageous.In addition, when general power is larger, with the increase of relay node and antenna number, the function such as tradition
The gap of the system break probability performance of the system break probability and the method for the present invention of rate distribution method is also increasing.
The present invention realizes following beneficial technical effect:
It realizes simply, including MRA relay node RrWith two communications source node A, B, communicates source node A jth root antenna, leads to
Information source node B l root antenna is respectively simultaneously to relay node RrPilot frequency information known to kth root antenna transmission；Relay node RrIt obtains
The channel gain between communication source node A, B and its each antenna and analysis are taken, is carried out optimal in optimal relaying and each node
Day line options after, complete information exchange, fully considered practical communication environment interior joint it is mutual move and non-ideal letter
Channel state information, and it is not limited to the static and ideal channel state information communication scene of node, therefore the method for the present invention is more suitable
For practical communication system；Frequency spectrum resource is not only efficiently utilized compared with traditional constant power distribution method in the present invention, and
And system break probability can be made to optimize, the performance of communication system is effectively promoted.
Although the present invention has chosen preferable embodiment and discloses as above, it is not intended to limit the present invention.Obviously, it is not necessarily to here
Also all embodiments can not be exhaustive.Any this field researcher without departing from the spirit and scope of the present invention,
The design method and content that all can be used in embodiment disclosed above are changed and are modified to research approach of the invention, because
This, all contents without departing from the present invention program, research essence according to the present invention is to any simple made by above-described embodiment
Modification, Parameters variation and modification, belong to the protection scope of the present invention program.
Claims (10)
1. the power distribution system of a kind of combined relaying and day line options characterized by comprising MRA relay node RrWith two
A communication source node A, B, described communication source node A, B and relay node RrThe antenna number of configuration is respectively Ma、MbAnd Mr, described
It communicates the jth root antenna of source node A, communicate the l root antenna of source node B for respectively simultaneously to relay node RrKth root
Pilot frequency information known to antenna transmission, the relay node RrFor obtaining between communication source node A, B and its each antenna
Channel gain is simultaneously analyzed, and after carrying out day line options optimal in optimal relaying and each node, completes information exchange, wherein j=
1,2,…Ma, l=1,2 ... Mb, k=1,2 ... Mc, r=1,2 ... MR。
2. the power distribution system of combined relaying according to claim 1 and day line options, which is characterized in that the relaying
Node RrIt works under half-duplex mode with communication source node A, B.
3. the power distribution method of a kind of combined relaying and day line options characterized by comprising
Source node A jth root antenna, communication source node B l root antenna are communicated respectively simultaneously to relay node RrKth root antenna transmission
Known pilot frequency information；
Relay node RrThe channel gain between communication source node A, B and its each antenna and analysis are obtained, optimal relaying is carried out
After day line options optimal in each node, information exchange is completed, wherein j=1,2 ... Ma, l=1,2 ... Mb, k=1,2 ...
Mc, r=1,2 ... MR。
4. the power distribution method of combined relaying according to claim 3 and day line options, which is characterized in that the relaying
Node RrIt obtains the channel gain between communication source node A, B and its each antenna and analysis includes: relay node RrIt obtains and passes through
Optimal power contribution when different antennae is transmittedWithIt saves as a result, then calculating t symbol period inner end
To end signal-to-noise ratio γ (t).
5. the power distribution method of combined relaying according to claim 4 and day line options, which is characterized in that further packet
It includes: relay node RrCombined relaying and day line options are carried out using distributed clock method.
6. the power distribution method of combined relaying according to claim 5 and day line options, which is characterized in that the distribution
Formula clock method includes: relay node RrTimer is set, the timing of the setting corresponding maximum noise of relay node thus
The inverse of ratio, i.e.,
7. the power distribution method of combined relaying according to claim 6 and day line options, which is characterized in that timingCorresponding antenna serial number (j, l, k) the corresponding optimal antenna serial number of relay node thus.
8. the power distribution method of combined relaying according to claim 7 and day line options, which is characterized in that
Maximum relaying is optimal relay node.
9. the power distribution method of combined relaying according to claim 8 and day line options, which is characterized in that according to minimum
Outage probability strategy carries out day line options optimal in optimal relaying and each node.
10. the power distribution method of combined relaying according to claim 9 and day line options, which is characterized in that it is described most
Small outage probability strategy are as follows:
In formula, optimal antenna serial number is { J, L, K, R } in optimal relaying and each node.
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Application publication date: 20190416 |