CN101958766B - Source end network coding and alternated transmission-based relay cooperation method - Google Patents
Source end network coding and alternated transmission-based relay cooperation method Download PDFInfo
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Abstract
The invention discloses a source end network coding and alternated transmission-based relay cooperation method, which is characterized in that: two relays are positioned outside the receiving radius of each other; a source end performs network coding on binary information sequences which are sent by the source end every three time slots; the two relays alternatively send the information in the adjacent time slots, the relay which sends the information in the last time slot receives the information in the present time slot, and the relay which receives the information in the last time slot sends the information in the present time slot; and when one relay receives the information sent by the source end in every time slot, the other relay forwards the information which is received and processed in the last time slot to a target end. Under the condition of not influencing cooperative diversity gain, the characteristics of two relay transmission models are fully utilized, more informationcan be transmitted within the same number of time slots, multiplexing loss in relay cooperative transmission is reduced, the transmission efficiency of the information is improved by 2/3, and both transmission performance and efficiency are considered in an actual relay cooperative communication system.
Description
Technical field
The invention belongs to the cooperating relay technical field of radio communication, be specifically related to utilize in the wireless communication system method of relaying cooperation transmission information.
Background technology
The performance of wireless communication system mainly is subjected to the restriction of wireless channel.Wireless channel is fixing unlike wire message way also can be predicted, but has great randomness.Propagation path between the transmitter and receiver is often very complicated, from simple line-of-sight propagation, to the landform that meets with various complexity, as building, mountain range, leaf etc., this makes to transmit and has experienced serious channel fading, thereby the Signal-to-Noise that causes receiver to be received is lower, and error probability is bigger.In order to improve error performance, " international electronics and The Institution of Electrical Engineers-information theory international conference " (Proceedings.2001IEEEInternational Symposium on Information Theory:294) proposed a kind of cooperating relay technology, namely utilize one or more relaying booster transmitters to send information, like this, can receive a plurality of copies that send signal at the receiver place, and they have experienced separate channel fading.The probability of serious decline is very little because a plurality of channels are in simultaneously, and its error rate is more directly transmitted much lower, and this is equivalent to the space diversity reception to communicate in many antennas (MIMO) system, thereby is called collaboration diversity again.
In order to realize collaboration diversity, in the relaying collaboration method that " international electronics and The Institution of Electrical Engineers-information theory international conference " (Proceedings.2001IEEE International Symposium on Information Theory:294) proposes, the first step, the source end is to relaying and destination broadcast singal, second step, relaying is transmitted to destination after treatment successively with the signal that receives on the subchannel of quadrature, and source end is kept silent during this; The mode that relay process receives signal comprises amplification forward pass (AF) and decoding forward pass (DF).This traditional trunking method, be also referred to as the repeated encoding method, the independent channel that utilizes each relaying to provide, obtained good space diversity gain, but compare with direct transferring, because relaying will send signal at the channel of quadrature, this method has spent twice even more channel resource, such as time slot or frequency band, be referred to as multiplexing loss.
In order to reduce the multiplexing loss of traditional relay transmission method, coding and transmission method when " international electronics and The Institution of Electrical Engineers-information theory transactions " (IEEE Transactions on Information Theory 49 (10): 2415-2425,2003) proposed a kind of new distributed space.In this method, the source end is earlier to a plurality of information of a plurality of repeat broadcast, and each relaying adopts the distributed space time-code to send it to destination after handling the reception signal then.This method has obtained space diversity gain equally, efficiency of transmission is 1/2 under a plurality of relaying situations, namely average per two time slots send an information, the relaying number improves a lot than traditional relay transmission method more for a long time, but because destination has half the time not receive information, its efficiency of transmission can't be higher, and it need encode when relaying carries out distributed space and synchronously, and is higher to the performance requirement of trunking.
Summary of the invention
The objective of the invention is to propose a kind of relaying collaboration method based on source-end networks coding and alternate transmission, the identical space diversity gain of decoding transmission method when in the communication environment of two relayings, obtaining with traditional trunking method and distributed space, than these methods still less multiplexing loss is arranged simultaneously, further improve efficiency of transmission.
The present invention is based on the relaying collaboration method of source-end networks coding and alternate transmission, the whole cooperative communication system comprises a source end, two relayings and a destination, and the channel between source end and two relayings, between two relayings and the destination is wireless fading channel; The source end is positioned at outside the reception radius of destination, and the source end communicates by two relayings and destination; Each relaying is worked in semiduplex mode of time-division, that is: each relaying sends or reception information and can not sending and receiving information simultaneously in same time slot at different time slot; A relaying adopts amplification forward pass (AF) mode directly signal to be amplified when sending to destination then, another relaying also adopts amplification forward pass mode to work, perhaps, when relaying adopted decoding forward pass (DF) mode that its signal decoding that receives and recompile are sent to destination then, another relaying also adopted decoding forward pass mode to work; It is characterized in that: two relayings are positioned at mutually outside the other side's the reception radius; The source end carries out the primary network coding to per three time slots of its binary message sequence that will send; Two relayings alternately send information in adjacent time slot, send relaying reception information in this time slot of information in the last time slot, receive relaying transmission information in this time slot of information in the last time slot; In the time of relaying reception sources end sends in each time slot information, another relaying is transmitted on it information that time slot receives and decoding was handled to destination;
Described relaying collaboration method detailed process is as follows:
First time slot, source first information of end broadcast transmission, two relayings receive this information;
Second time slot, source end send the mixed information behind first and second the information via network code, and second relaying receives this information, and simultaneously, its information that receives of the previous time slot of first relaying decoding processing forward is given destination;
The 3rd time slot, the source end sends second information, and first relaying receives this information, and second its information that receives of the previous time slot of relaying decoding processing forward is given destination simultaneously;
The 4th time slot, source end send the 3rd information, and second relaying receives this information, and its information that receives of the previous time slot of first relaying decoding processing forward is given destination simultaneously;
Per three time slots afterwards, source end and two relayings are all according to the mode alternate transmission information of similar second to four time slot, and in each time slot, another relaying sends information when having a relaying to receive information of same;
3n-1 time slot, source end send the mixed information behind 2n-1 and 2n the information via network code, and a relaying receives this information, and simultaneously, its information that receives of the previous time slot of another relaying decoding processing forward is to destination;
3n time slot, the source end sends 2n information, and the relaying that sends information in the last time slot receives this information, and its information that receives of the previous time slot of another relaying decoding processing forward is given destination simultaneously;
3n+1 time slot, the source end sends 2n+1 information, and the relaying that sends information in the last time slot receives this information, and its information that receives of the previous time slot of another relaying decoding processing forward is given destination simultaneously.
Because the present invention has adopted the method for alternate transmission, during with traditional relaying collaboration method and distributed space in the decoding transmission method two relayings receive simultaneously, the method of Fa Songing is compared simultaneously, the characteristics of two relay transmission models have been taken full advantage of, relaying source end in the information of forwarding is no longer kept silent, but send information to another relaying, thereby the source of assurance end is ceaselessly sending information, destination is ceaselessly receiving information, make the present invention in the time slot of similar number, transmit more information, greatly reduce multiplexing loss, improved the efficient of transmission.
Because the present invention has also adopted the source-end networks Methods for Coding, be combined effectively with alternate transmission, utilize network code can improve throughput and saving time slot, send one through the mixed information behind the network code at per three time slots of source end, make destination in three time slots, receive two information respectively and comprise the network code information of these two information, decoding transmission method is compared during with distributed space with traditional relaying collaboration method, under the situation that obtains same space diversity performance, further save time slot, improved efficiency of transmission.Simultaneously, because the network code among the present invention carries out at the source end, the handling property of trunking there is not specific (special) requirements, relaying can be AF, also can be DF, and during distributed space in the decoding transmission method, require trunking can carry out Space Time Coding, and can only be operated in the DF mode.
Description of drawings
Fig. 1 is for adopting the structural model schematic diagram of relaying cooperation transmission wireless communication system of the present invention.
Fig. 2 is for adopting the transmission course schematic diagram of relaying cooperation transmission wireless communication system of the present invention.
Fig. 3 handles the schematic diagram that receives signal for destination.
Fig. 4 is the multiplexing trade off performance curve of the diversity comparison diagram of the present invention and existing relaying collaboration method.
Fig. 5 is the simulation performance comparison diagram that the outage probability of the present invention and existing relaying collaboration method changes with signal to noise ratio.
Fig. 6 is the simulation performance comparison diagram that the error rate of the present invention and existing relaying collaboration method changes with signal to noise ratio.
Embodiment
Embodiment 1: based on the relaying collaboration method of source-end networks coding and alternate transmission
Present embodiment is introduced the specific embodiment of the present invention with employing illustrated in figures 1 and 2 relaying cooperation transmission of the present invention wireless communication system schematic diagram.Fig. 1 has provided relaying cooperation transmission wireless communication system architecture model schematic diagram of the present invention.Fig. 2 is for adopting the transmission course schematic diagram of relaying cooperative transmission system of the present invention based on this structural model.
As shown in Figure 1, the present invention is based on the relaying collaboration method of source-end networks coding and alternate transmission, whole relaying cooperation communication system comprises a source end S, two relaying first relaying R1 and the second relaying R2 and a destination D.Source end S is positioned at outside the reception radius of destination D, and destination D can't directly receive the information that source end S sends, and source end S can only communicate by two relaying R1 and R2 and destination D.Between source end S and two relaying R1 and the R2, be rayleigh fading channel between two relaying R1 and R2 and the destination D, namely channel coefficients is separate multiple Gaussian random variable, its amplitude Rayleigh distributed.The first relaying R1 is positioned at outside the reception radius of the second relaying R2, and the same second relaying R2 also is positioned at outside the reception radius of the first relaying R1.Like this, when the first relaying R1 sends information and the second relaying R2 when receiving information, the second relaying R2 only can receive the information that source end S sends, and can not receive the information that the first relaying R1 sends, thereby has avoided interference.Two relayings all are that the time-division is semiduplex, that is: each relaying sends or reception information and can not sending and receiving information simultaneously in same time slot at different time slot; When a relaying adopted amplification forward pass (AF) mode directly the signal amplification to be sent to destination then, another relaying also adopted amplification forward pass mode to work; Perhaps, when relaying adopted decoding forward pass (DF) mode that its signal decoding that receives and recompile are sent to destination then, another relaying also adopted decoding forward pass mode to work.
Fig. 2 has provided the schematic diagram of relaying cooperation transmission process, and being divided into is seven components, with lowercase a-g sign, has listed and has adopted relaying collaboration method first of the present invention to the signals transmission of the 7th time slot respectively.
Source end S is the identical binary sequence s1 of length to destination D information transmitted, s2 ..., s2n, its relaying collaboration method detailed process is as follows:
Shown in the component a among Fig. 2, first time slot, source end S are broadcasted it and are wanted first binary message sequence s1 of sending, and the first relaying R1 and the second relaying R2 all receive this information, because the link that do not direct transfer, destination D does not receive signal in this time slot;
Shown in component b, second time slot, source end S send first binary message sequence s1 and second binary message sequence s2 through the mixed information behind the network code
The second relaying R2 receives this mixed information
Simultaneously, first relaying R1 decoding is transmitted its information of receiving of previous time slot and is given destination D;
Shown in component c, the 3rd time slot, source end S sends second binary message sequence s2, and the first relaying R1 receives this information, and second relaying R2 decoding is simultaneously transmitted its information of receiving of previous time slot and is given destination D;
Shown in component d, the 4th time slot, source end S send the 3rd binary message sequence s3, and the second relaying R2 receives this information, and first relaying R1 decoding is simultaneously transmitted its information of receiving of previous time slot and given destination D;
Shown in component e, the 5th time slot, source end S send the 3rd binary message sequence s3 and the 4th binary message sequence s4 through the mixed information behind the network code
The first relaying R1 receives this information, and simultaneously, second relaying R2 decoding is transmitted its information of receiving of previous time slot and given destination D;
Shown in component f, the 6th time slot, source end S send the 4th binary message sequence s4, and the second relaying R2 receives this information, and first relaying R1 decoding is simultaneously transmitted its information of receiving of previous time slot and given destination D;
Shown in component g, the 7th time slot, source end S send the 5th binary message sequence s5, and the first relaying R1 receives this information, and second relaying R2 decoding is simultaneously transmitted its information of receiving of previous time slot and given destination D;
Afterwards, in per three time slots, source end S and two relaying R1, R2 alternately transmit information according to the mode of second to four time slot and the 5th to seven time slot.
The signal that the signal that end S in source in each time slot, two relaying R1, R2 send and destination D receive is as shown in following table 1:
The signal that table 1 sends and receives
The first line display time slot in the form, second and third, four lines is respectively the binary message sequence that end S in source sends in each time slot, the first relaying R1 sends, the second relaying R2 sends, fifth line is the binary message sequence that destination D receives in each time slot.
Fig. 3 is that destination D handles the schematic diagram that receives signal.Be example with second to four time slot, two relayings are all decoded when correct, and the signal that destination D receives at second and third, in four time slots is respectively
y
d[2]＝h
1，ds1+z
d[2]
y
d[4]＝h
1，ds2+z
d[4]
Wherein, h
1, d, h
2, dBe respectively between the first relaying R1 and the destination D, the channel fading coefficient between the second relaying R2 and the destination D, y
d[k], z
d[k] is respectively signal and the noise that k time slot destination D receives.Destination D with its second and third, four signal y that time slot receives
d[2], y
d[3], y
d[4] through calculating the log-likelihood ratio steps A, calculate the network code sequence of first binary message sequence s1, first binary message sequence s1 and second binary message sequence s2 respectively
The log-likelihood ratio LLR (s1) of second binary message sequence s2,
LLR (s2); Carry out sum-product algorithm step B then, upgrade log-likelihood ratio LLR2 (s1), the LLR2 (s2) of first binary message sequence s1 and second binary message sequence s2 by sum-product algorithm; Carry out decision steps C at last, utilize log-likelihood ratio LLR2 (s1), LLR2 (s2) after upgrading to adjudicate first binary message sequence s1 that obtains original transmission, second binary message sequence s2 respectively.
Embodiment 2: performance and emulation
Fig. 4 has provided the multiplexing trade off performance curve of the diversity G of the relaying collaboration method that the present invention is based on source-end networks coding and alternate transmission, the comparison of the diversity multiplexing trade off performance curve F of decoding transmission method and the multiplexing trade off performance curve of the diversity H that direct transfers during with the multiplexing trade off performance curve of the diversity of traditional trunking method E, distributed space.As can be seen from Figure 4, under same diversity gain, decoding transmission method has bigger spatial multiplexing gain when adopting relaying collaboration method of the present invention than traditional trunking method and distributed space.Under the situation of two relayings, information of per three slot transmission of traditional trunking method, efficiency of transmission is 1/3, information of per two slot transmission of decoding transmission method during distributed space, efficiency of transmission is 1/2, and adopts every 3n+1 slot transmission 2n information of relaying collaboration method of the present invention, and efficiency of transmission is 2n/ (3n+1), n is tending towards 2/3 when big, has greatly improved efficiency of transmission.
Fig. 5 has provided the Monte-Carlo Simulation performance that outage probability changes with signal to noise ratio, and the outage probability performance curve J of decoding transmission method compares during by the outage probability performance curve I of the outage probability performance curve K that adopts relaying collaboration method of the present invention and traditional trunking method and distributed space.Establish relaying in the emulation and be correctly decoded, channel coefficients is that variance is 2 multiple Gaussian random process, and the speed thresholding is every hertz of 2 bits per second, information transmitted sequence number 2n=1000000, and each sequence is 1 bit.As can be seen from Figure 5, outage probability reduces along with the increase of signal to noise ratio, when signal to noise ratio was big, the curve of decoding transmission method had identical slope when adopting relaying collaboration method of the present invention with traditional trunking method and distributed space, illustrated that they have all obtained full diversity gain 2; And, under same signal to noise ratio, adopt the outage probability minimum of relaying collaboration method correspondence of the present invention.
Fig. 6 has provided the simulation performance that the error rate changes with signal to noise ratio, and the bit error rate performance curve M of decoding transmission method compares during by the bit error rate performance curve N that adopts relaying collaboration method of the present invention and the bit error rate performance curve L that direct transfers and distributed space.Adopt binary phase shift keying (bpsk) modulation system in the emulation, establish relaying and be correctly decoded, channel coefficients is that variance is 2 multiple Gaussian random process, its amplitude Rayleigh distributed, and information transmitted sequence number 2n=1000000, each sequence is 1 bit.As can be seen from Figure 6, code method is more approaching when adopting the error rate of relaying collaboration method of the present invention and distributed space, the gap of the 1dB that only has an appointment, and also they have same slope, namely all obtained full diversity gain 2, with respect to the ber curve that direct transfers remarkable advantages has been arranged.
Claims (1)
1. relaying collaboration method based on source-end networks coding and alternate transmission, the whole cooperative communication system comprises a source end, two relayings and a destination, and the channel between source end and two relayings, between two relayings and the destination is wireless fading channel; The source end is positioned at outside the reception radius of destination, and the source end communicates by two relayings and destination; Each relaying is worked in semiduplex mode of time-division, that is: each relaying sends or reception information and can not sending and receiving information simultaneously in same time slot at different time slot; A relaying adopts amplification forward pass mode directly signal to be amplified when sending to destination then, another relaying also adopts amplification forward pass mode to work, perhaps, when relaying adopted decoding forward pass mode that its signal decoding that receives and recompile are sent to destination then, another relaying also adopted decoding forward pass mode to work;
It is characterized in that:
Two relayings are positioned at mutually outside the other side's the reception radius; The source end carries out the primary network coding to per three time slots of its binary message sequence that will send; Two relayings alternately send information in adjacent time slot, send relaying reception information in this time slot of information in the last time slot, receive relaying transmission information in this time slot of information in the last time slot; In the time of relaying reception sources end sends in each time slot information, another relaying is transmitted on it that time slot receives and is handled or information that decoding was handled through amplifying to destination;
Described relaying collaboration method detailed process is as follows:
First time slot, source first information of end broadcast transmission, two relayings receive this information;
Second time slot, source end send the mixed information behind first and second the information via network code, and second relaying receives this information, and simultaneously, first relaying amplifies to be handled or its information that receives of the previous time slot of decoding processing forward is given destination;
The 3rd time slot, the source end sends second information, and first relaying receives this information, and second relaying amplification processing simultaneously or its information that receives of the previous time slot of processing forward of decoding are given destination;
The 4th time slot, source end send the 3rd information, and second relaying receives this information, and first relaying amplification is simultaneously handled or its information that receives of the previous time slot of decoding processing forward is given destination;
Per three time slots afterwards, source end and two relayings are all according to the mode alternate transmission information of similar second to four time slot, and in each time slot, another relaying sends information when having a relaying to receive information of same;
3n-1 time slot, source end send the mixed information behind 2n-1 and 2n the information via network code, and a relaying receives this information, simultaneously, another relaying amplify handle or its information that receives of the previous time slot of decoding processing forward to destination;
3n time slot, the source end sends 2n information, and the relaying that sends information in the last time slot receives this information, and another relaying amplification is simultaneously handled or its information that receives of the previous time slot of decoding processing forward is given destination;
3n+1 time slot, the source end sends 2n+1 information, and the relaying that sends information in the last time slot receives this information, and another relaying amplification is simultaneously handled or its information that receives of the previous time slot of decoding processing forward is given destination.
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| CN102684815A (en) * | 2011-03-09 | 2012-09-19 | 华为技术有限公司 | Transmission method and transmission system for cooperative communication and relay node |
| CN102136883B (en) * | 2011-03-15 | 2013-05-08 | 清华大学 | Network coding-based cooperative relay transmission method |
| CN103023628B (en) * | 2012-12-21 | 2015-08-05 | 无锡北邮感知技术产业研究院有限公司 | The relay cooperative HARQ method of coding Network Based |
| US9621253B2 (en) * | 2014-05-09 | 2017-04-11 | Empire Technology Development Llc | Single slot bi-directional message exchange in relay networks |
| CN107113912A (en) * | 2014-11-13 | 2017-08-29 | 华为技术有限公司 | A kind of device-to-device communicator, system and method |
| CN106255164A (en) * | 2015-06-11 | 2016-12-21 | 北京信威通信技术股份有限公司 | Collaboration communication processing method and processing device |
| CN109309522B (en) * | 2017-07-28 | 2021-12-03 | 广州极飞科技股份有限公司 | Method, device and system for signal transmission and unmanned aerial vehicle positioning |
| WO2019213940A1 (en) * | 2018-05-11 | 2019-11-14 | Oppo广东移动通信有限公司 | Relay system synchronization method and apparatus, and computer device and storage medium |
| CN111327380B (en) * | 2018-12-14 | 2022-08-16 | 鹤壁天海电子信息系统有限公司 | Bidirectional data transmission method and system and communication equipment |
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