CN109586835A - A kind of continuous pairs multiple-access communication control processor self-interference canceller synchronous method - Google Patents
A kind of continuous pairs multiple-access communication control processor self-interference canceller synchronous method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0026—Interference mitigation or co-ordination of multi-user interference
- H04J11/0036—Interference mitigation or co-ordination of multi-user interference at the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7087—Carrier synchronisation aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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Abstract
A kind of continuous pairs multiple-access communication control processor self-interference canceller synchronous method: when self-interference canceller is in desynchronizing state, stops sending data frame and empty local data frame buffer, start to continuously transmit training frames；Physical frame/timing combined synchronization of self-interference signal is carried out using received local training frames；After synchronizing, into physical frame/timing combined synchronization tracking of self-interference signal；Under synchronized tracking state, capture first local self-interference data frame is attempted；If successfully capturing, local data frame is sequentially extracted from local data frame buffer and carries out self-interference signal reconstruct and offsets.Estimate without the channel transmission time delay to self-interference signal, after the physical frame/timing combined synchronization for completing self-interference signal, the initial position of each self-interference signal physical frame can be correctly found, and then guarantees to receive the self-interference signal sequence in mixed signal and the self-interference signal sequence close alignment in local cache in cancellation process.
Description
Technical field
The invention belongs to simultaneous techniques, especially same with a kind of continuous pairs multiple-access communication control processor self-interference canceller
One step process is related.
Background technique
Frequency division multiple access (Frequency Division Multiple Access:FDMA) is wide in continuous number communication
A kind of general multi-access mode used, its main feature is that each user sends or receives signal by independent frequency range, so as to avoid
Interfere with each other (as shown in Figure 1).However, the availability of frequency spectrum of this multi-access mode is lower, and then lead to the user of communication system
Capacity is smaller.Paired carrier multiple access (Paired Carrier Multiple Access:PCMA) refers to two users same
Time sends or receives the multiple access technology (as shown in Figure 2) of signal using same frequency range.Due to communicating pair share spectrum resources,
Therefore, for the communication system using PCMA technology, the availability of frequency spectrum and user capacity than the communication system using FDMA technology
System is doubled.
According to the characteristics of PCMA technology it is found that the signal of communicating pair not only receives channel impairments, but also it is superposed on one another,
It interferes with each other.The signal that receiver receives is the mixed of self-interference signal (i.e. the signal of user's own transmission) and desired signal composition
Close signal.Therefore, a kind of typical reception scheme is to use self-interference cancellation techniques will be in mixed signal in local receiver
Self-interference signal removal, to obtain desired reception signal (as shown in Figure 3).
When progress self-interference offsets, if the self-interference signal sequence in mixed signal and the self-interference in local cache
Signal sequence close alignment, then canceller can sufficiently remove self-interference signal (as shown in Figure 4)；Conversely, can not then fill
Divide removal self-interference signal.Remaining self-interference signal, which can demodulate desired signal, to have an adverse effect.Therefore, pairs of carrier wave is more
The matter of utmost importance that communication control processor needs in location solve is: in self-interference cancellation process, making the self-interference signal in mixed signal
Self-interference signal sequence alignment in sequence and local cache, the i.e. stationary problem of self-interference canceller.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of continuous pairs multiple-access communication control processor self-interference canceller
Synchronous method is estimated without the channel transmission time delay to self-interference signal, when local receiver completes self-interference signal
After physical frame/timing combined synchronization, so that it may correctly find the initial position of each self-interference signal physical frame, and then guarantee
The self-interference signal sequence in mixed signal is received in cancellation process and the self-interference signal sequence in local cache is strictly right
Together.
The present invention uses following technology:
A kind of continuous pairs multiple-access communication control processor self-interference canceller synchronous method, which is characterized in that including following step
It is rapid:
S0 respectively scrambles the physical frame of communicating pair using the orthogonal scrambling code of an alignment；
Two kinds of isometric physical frames, data frame and training frames are defined, and are distinguish by frame head；It is all to have data frame frame head
Physical frame be accordingly to be regarded as data frame；All physical frames with training frames frame head are accordingly to be regarded as training frames, and all training frames all wrap
Containing identical data；Data frame frame head and training frames frame head standard are orthogonal；
Local receiver needs to detect physical frame type and its initial position of self-interference signal；
When self-interference canceller is in synchronous regime, local transmitter only sends data frame；
When self-interference canceller is in desynchronizing state, local transmitter only sends training frames；
The data frame and training frames send to local transmitter caches respectively, the data frame sequence sent is stored in local
Data frame buffer memory area；Local training frame buffer only stores a training frames；
S1 stops self-interference and offsets operation when self-interference canceller is in desynchronizing state；Local transmitter stops sending data
Frame simultaneously empties local data frame buffer, then starts to continuously transmit training frames；
S2 local receiver carries out physical frame/timing combined synchronization of self-interference signal using received local training frames；
S3 is after physical frame/timing combined synchronization that local receiver completes self-interference signal, into the object of self-interference signal
Manage frame/timing combined synchronization tracking；Local transmitter stops sending training frames, and starts to continuously transmit data frame, while will
The data frame sequence of transmission is stored in local data frame buffer；
For S4 under self-interference signal physical frame/timing combined synchronization tracking mode, local receiver attempts first local of capture
Self-interference data frame；
If S5 local receiver is successfully acquired first local self-interference data frame, the sequence from local data frame buffer
Local data frame is extracted to carry out self-interference signal reconstruct and offset；If local receiver, which fails, captures first local certainly
Data frame is interfered, then carries out desynchronizing state, and return to S1；
Physical frame/timing combined synchronization state that S6 local receiver continues to monitor self-interference signal returns to S1 if step-out.
Wherein, the physical frame of the self-interference signal/timing combined synchronization method the following steps are included:
S21 receiver carries out physics frame-grab to self-interference signal；
S22 receiver is timed synchronization using the self-interference signal that success captures；
S23 repeats the operation of S21 and S22, until Timing Synchronization is completed；
Under conditions of Timing Synchronization is completed, receiver continues to carry out physics frame-grab to self-interference signal S24；Successfully capturing
To after the initial position of self-interference signal physical frame, physical frame/timing combined synchronization of self-interference signal is completed.
Wherein, the physical frame of the self-interference signal/timing combined synchronization tracking the following steps are included:
S31 is under conditions of completing physical frame/timing combined synchronization of self-interference signal, self-interference of the receiver currently to capture
The initial position of signal physical frame is reference, and next self-interference signal physical frame is accurately captured by way of numeration；
S32 receiver is timed tracking using the self-interference signal that success captures；
S33 repeats S31 and S32, to keep physical frame and the timing of self-interference signal to be in synchronous regime.
Further, in the S31 step, the period of numeration is the sample number of a physical frame.
Wherein, in the S5 step, if local receiver is successfully acquired first local self-interference data frame, with this
Based on successively captured by way of numeration after each local self-interference data frame, wherein the numeration period is one
The sample number of a physical frame.
The invention has the advantages that:
Estimate without the channel transmission time delay to self-interference signal, when local receiver completes the physics of self-interference signal
After frame/timing combined synchronization, so that it may correctly find the initial position of each self-interference signal physical frame, and then guarantee right
The self-interference signal sequence in mixed signal and the self-interference signal sequence close alignment in local cache are received during disappearing.
Detailed description of the invention
Fig. 1 is the frequency spectrum distribution schematic diagram of two users in point-to-point FDMA communication.
Fig. 2 is the frequency spectrum distribution schematic diagram of two users in point-to-point PCMA communication.
Fig. 3 is the PCMA communication control processor schematic diagram offseted based on self-interference.
Fig. 4 is that the synchronization self-interference of PCMA communication control processor offsets schematic diagram.
Fig. 5 is the quasi- orthogonal property schematic diagram of the orthogonal scrambling code of an alignment.
Fig. 6 is the quasi- orthogonal property schematic diagram of data frame frame head and training frames frame head.
Fig. 7 is workflow relevant to transmitter in the method for the invention.
Fig. 8 is workflow relevant to receiver in the method for the invention.
Specific embodiment
In order to keep the purpose, technical solution and specific implementation method of the application apparent, in conjunction with attached Example to this Shen
It please be further elaborated.
This method includes following precondition:
1) in communication process, the physical frame of communicating pair is scrambled respectively using the orthogonal scrambling code of an alignment, it is such as specific to use
Scrambling code A and scrambling code B, quasi- orthogonal property are as shown in Figure 5.
2) two kinds of isometric physical frames: data frame and training frames are defined, and are distinguish by frame head.It is all to have data
The physical frame of frame frame head is accordingly to be regarded as data frame；All physical frames with training frames frame head are accordingly to be regarded as training frames, and all training
Frame all includes identical data.
3) data frame frame head and training frames frame head standard are orthogonal, as shown in Figure 6.
4) local receiver needs to detect physical frame type and its initial position of self-interference signal.
5) when self-interference canceller is in synchronous regime, local transmitter only sends data frame；When self-interference canceller
When in desynchronizing state, local transmitter only sends training frames, for assisting self-interference canceller synchronous.
6) data frame and training frames of local transmitter transmission are cached respectively.The data frame sequence sent is deposited
Enter local data frame buffer；Local training frame buffer only stores a training frames.
7) local receiver need to receive mixed signal in self-interference signal carry out physical frame/timing combined synchronization and
Tracking.
Under above-mentioned precondition, synchronize:
A kind of continuous pairs multiple-access communication control processor self-interference canceller synchronous method, comprising the following steps:
S1 stops self-interference and offsets operation when self-interference canceller is in desynchronizing state；Local transmitter stops sending data
Frame simultaneously empties local data frame buffer, then starts to continuously transmit training frames.
S2 local receiver carries out physical frame/timing combined synchronization of self-interference signal using received local training frames,
Synchronous method the following steps are included:
S21 receiver carries out physics frame-grab to self-interference signal；
S22 receiver is timed synchronization using the self-interference signal that success captures；
S23 repeats the operation of S21 and S22, until Timing Synchronization is completed；
Under conditions of Timing Synchronization is completed, receiver continues to carry out physics frame-grab to self-interference signal S24；Successfully capturing
To after the initial position of self-interference signal physical frame, physical frame/timing combined synchronization of self-interference signal is completed.
S3 is after physical frame/timing combined synchronization that local receiver completes self-interference signal, into self-interference signal
Physical frame/timing combined synchronization tracking；Local transmitter stops sending training frames, and starts to continuously transmit data frame, simultaneously
The data frame sequence sent is stored in local data frame buffer；Wherein, method for synchronized includes:
S31 is under conditions of completing physical frame/timing combined synchronization of self-interference signal, self-interference of the receiver currently to capture
The initial position of signal physical frame is reference, and next self-interference signal physical frame is accurately captured by way of numeration；Note
Several periods is the sample number of a physical frame；
S32 receiver is timed tracking using the self-interference signal that success captures；
S33 repeats S31 and S32, to keep physical frame and the timing of self-interference signal to be in synchronous regime.
For S4 under self-interference signal physical frame/timing combined synchronization tracking mode, local receiver attempts capture first
Local self-interference data frame；
If S5 local receiver is successfully acquired first local self-interference data frame, based on this by way of numeration
Each local self-interference data frame after successively capturing, wherein the numeration period is the sample number of a physical frame；From this
Local data frame is sequentially extracted in ground data frame buffer memory area to carry out self-interference signal reconstruct and offset；If local receiver fails into
Function captures first local self-interference data frame, then carries out desynchronizing state, and return to S1；
Physical frame/timing combined synchronization state that S6 local receiver continues to monitor self-interference signal returns to S1 if step-out.
The synchronization that continuous pairs multiple-access communication control processor self-interference canceller is completed by the above method, without to certainly
The channel transmission time delay of interference signal is estimated, when physical frame/timing joint that local receiver completes self-interference signal is same
After step, so that it may correctly find the initial position of each self-interference signal physical frame, and then guarantee to receive in cancellation process
The self-interference signal sequence close alignment in self-interference signal sequence and local cache in mixed signal.
Claims (7)
1. a kind of continuous pairs multiple-access communication control processor self-interference canceller synchronous method, which is characterized in that including following
Step:
S0 respectively scrambles the physical frame of communicating pair using the orthogonal scrambling code of an alignment；
Two kinds of isometric physical frames, data frame and training frames are defined, and are distinguish by frame head；It is all to have data frame frame head
Physical frame be accordingly to be regarded as data frame；All physical frames with training frames frame head are accordingly to be regarded as training frames, and all training frames all wrap
Containing identical data；
Data frame frame head and training frames frame head standard are orthogonal；
Local receiver needs to detect physical frame type and its initial position of self-interference signal；
S1 stops self-interference and offsets operation when self-interference canceller is in desynchronizing state；Local transmitter stops sending data
Frame simultaneously empties local data frame buffer, then starts to continuously transmit training frames；
S2 local receiver carries out physical frame/timing combined synchronization of self-interference signal using received local training frames；
S3 is after physical frame/timing combined synchronization that local receiver completes self-interference signal, into the object of self-interference signal
Manage frame/timing combined synchronization tracking；Local transmitter stops sending training frames, and starts to continuously transmit data frame, while will
The data frame sequence of transmission is stored in local data frame buffer；
For S4 under self-interference signal physical frame/timing combined synchronization tracking mode, local receiver attempts first local of capture
Self-interference data frame；
If S5 local receiver is successfully acquired first local self-interference data frame, the sequence from local data frame buffer
Local data frame is extracted to carry out self-interference signal reconstruct and offset；If local receiver, which fails, captures first local certainly
Data frame is interfered, then carries out desynchronizing state, and return to S1；
Physical frame/timing combined synchronization state that S6 local receiver continues to monitor self-interference signal returns to S1 if step-out.
2. continuous pairs multiple-access communication control processor self-interference canceller synchronous method according to claim 1, special
Sign is: the physical frame of the self-interference signal/timing combined synchronization method the following steps are included:
S21 receiver carries out physics frame-grab to self-interference signal；
S22 receiver is timed synchronization using the self-interference signal that success captures；
S23 repeats the operation of S21 and S22, until Timing Synchronization is completed；
Under conditions of Timing Synchronization is completed, receiver continues to carry out physics frame-grab to self-interference signal S24；Successfully capturing
To after the initial position of self-interference signal physical frame, physical frame/timing combined synchronization of self-interference signal is completed.
3. continuous pairs multiple-access communication control processor self-interference canceller synchronous method according to claim 1, special
Sign is: the physical frame of the self-interference signal/timing combined synchronization tracking the following steps are included:
S31 is under conditions of completing physical frame/timing combined synchronization of self-interference signal, self-interference of the receiver currently to capture
The initial position of signal physical frame is reference, and next self-interference signal physical frame is accurately captured by way of numeration；
S32 receiver is timed tracking using the self-interference signal that success captures；
S33 repeats S31 and S32, to keep physical frame and the timing of self-interference signal to be in synchronous regime.
4. continuous pairs multiple-access communication control processor self-interference canceller synchronous method according to claim 3, special
Sign is: in the S31 step, the period of numeration is the sample number of a physical frame.
5. continuous pairs multiple-access communication control processor self-interference canceller synchronous method according to claim 1, special
Sign is: in the S5 step, if local receiver is successfully acquired first local self-interference data frame, based on this
Each local self-interference data frame after successively being captured by way of numeration, wherein the numeration period is a physics
The sample number of frame.
6. continuous pairs multiple-access communication control processor self-interference canceller synchronous method according to claim 1, special
Sign is:
When self-interference canceller is in synchronous regime, local transmitter only sends data frame；
When self-interference canceller is in desynchronizing state, local transmitter only sends training frames.
7. continuous pairs multiple-access communication control processor self-interference canceller synchronous method according to claim 1, special
Sign is: the data frame and training frames send to local transmitter caches respectively, and the data frame sequence sent is stored in
Local data frame buffer；Local training frame buffer only stores a training frames.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110752869A (en) * | 2019-10-14 | 2020-02-04 | 南京天际易达通信技术有限公司 | Method for detecting stealing signal in satellite communication |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431498A (en) * | 2008-12-02 | 2009-05-13 | 清华大学 | Demodulation method and device for flexible sub-carrier modulation system |
| US20100054131A1 (en) * | 2008-08-26 | 2010-03-04 | Agence Spatiale Europeenne | Methods, apparatuses and system for asynchronous spread-spectrum communication |
| WO2010061993A1 (en) * | 2008-11-28 | 2010-06-03 | Sas Technologies Co., Ltd. | Apparatus and method for acquaring frame synchronization |
| CN101729089A (en) * | 2008-10-23 | 2010-06-09 | 弥亚微电子（上海）有限公司 | Transmitter and receiver of communication system and synchronization method thereof |
| CN203722632U (en) * | 2013-11-11 | 2014-07-16 | 四川安迪科技实业有限公司 | Satellite communication terminal having multiple receiving channels |
| CN106572037A (en) * | 2016-11-11 | 2017-04-19 | 中国航空无线电电子研究所 | Signal frame receiving method for aviation telemetering channel |
| CN106656400A (en) * | 2016-10-21 | 2017-05-10 | 南京邮电大学 | Accurate frequency difference fast acquisition method in time delay jitter condition of PCMA system |
| CN107359902A (en) * | 2017-07-17 | 2017-11-17 | 南京邮电大学 | A kind of PCMA Time Delay of Systems and frequency difference Fast Coarse method for catching based on frequency slots and FFT |
| CN108494467A (en) * | 2018-01-16 | 2018-09-04 | 四川安迪科技实业有限公司 | A kind of physical layer adaptive ACM synchronous method based on satellite communication |
-
2018
- 2018-10-19 CN CN201811218456.XA patent/CN109586835B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100054131A1 (en) * | 2008-08-26 | 2010-03-04 | Agence Spatiale Europeenne | Methods, apparatuses and system for asynchronous spread-spectrum communication |
| CN101729089A (en) * | 2008-10-23 | 2010-06-09 | 弥亚微电子（上海）有限公司 | Transmitter and receiver of communication system and synchronization method thereof |
| WO2010061993A1 (en) * | 2008-11-28 | 2010-06-03 | Sas Technologies Co., Ltd. | Apparatus and method for acquaring frame synchronization |
| CN101431498A (en) * | 2008-12-02 | 2009-05-13 | 清华大学 | Demodulation method and device for flexible sub-carrier modulation system |
| CN203722632U (en) * | 2013-11-11 | 2014-07-16 | 四川安迪科技实业有限公司 | Satellite communication terminal having multiple receiving channels |
| CN106656400A (en) * | 2016-10-21 | 2017-05-10 | 南京邮电大学 | Accurate frequency difference fast acquisition method in time delay jitter condition of PCMA system |
| CN106572037A (en) * | 2016-11-11 | 2017-04-19 | 中国航空无线电电子研究所 | Signal frame receiving method for aviation telemetering channel |
| CN107359902A (en) * | 2017-07-17 | 2017-11-17 | 南京邮电大学 | A kind of PCMA Time Delay of Systems and frequency difference Fast Coarse method for catching based on frequency slots and FFT |
| CN108494467A (en) * | 2018-01-16 | 2018-09-04 | 四川安迪科技实业有限公司 | A kind of physical layer adaptive ACM synchronous method based on satellite communication |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110752869A (en) * | 2019-10-14 | 2020-02-04 | 南京天际易达通信技术有限公司 | Method for detecting stealing signal in satellite communication |
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