CN103152141A - Cooperation space-time network coding method in multisource distributed cooperative network - Google Patents
Cooperation space-time network coding method in multisource distributed cooperative network Download PDFInfo
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- CN103152141A CN103152141A CN2013100895835A CN201310089583A CN103152141A CN 103152141 A CN103152141 A CN 103152141A CN 2013100895835 A CN2013100895835 A CN 2013100895835A CN 201310089583 A CN201310089583 A CN 201310089583A CN 103152141 A CN103152141 A CN 103152141A
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Abstract
The invention discloses a cooperation space-time network coding method based on a relay decode-forward protocol in a multisource distributed cooperative network. The method comprises the following steps that the multisource distributed cooperative network adopts multiple single antenna information sources, a relay node R, and a destination node D; the single antenna information sources send respectively generated bit source information to a transmitting antenna, and the multiple information sources simultaneously transmit information symbols to the relay node R and the destination node D; the relay node R carries out multi-antenna receiving, decoding processing and storing; the relay node R carries out space-time network coding; the relay node R sends signals according to a coding matrix, and the destination node D receives the signals; and the destination node D carries out joint maximum likelihood decoding on the received relay signals and the signals from the information sources. According to the method, the multiple information sources can be communicated mutually, a relay protocol is flexible so as to be suitable for different wireless network environments, the diversity gain can be obtained, and the transmission efficiency is improved.
Description
Technical field
The invention belongs to wireless communication field, be specifically related in a kind of multi-source distributed collaborative network to forward the cooperation of (Decoding and Forward) agreement network code (cooperation space-time network coding, CSTNC) method when empty based on relaying decoding.
Technical background
Along with the high speed development of wireless communication technology, require the higher rate of information throughput and more efficient communication quality.In recent years, a lot of wireless communication technologys occurred, wherein most study is many antennas MIMO technology, and this technology utilizes empty time-code (Space-Time Coding, STC) to increase to a great extent power system capacity, brings raising very large on performance.In addition, cooperative diversity technique has also obtained very large attention, and this technology has solved many antenna restrictions of the middle-size and small-size communication apparatus of MIMO technology, can improve diversity gain, enlarges network coverage, conserve network resources.And distributed multi-source cooperative system has structure flexibly, and multiple source communication is convenient, and trunk protocol is flexible and changeable, and is widely used applicable to the different networks environment.
In addition, the application of network code (network coding, NC) can not only effectively improve the resource utilization of system, increases network throughput, obtains the network code gain, further improves systematic function.This technology is utilized the nodes encoding technology, and the time interval resource when having saved to a greater extent the signal transmission can improve efficiency of transmission, increases System Error-tolerance Property.
At present, the research of network code when some scholars is devoted to sky, be mainly in the multiple source situation, the signal after with network code carries out distributed STC design based on a plurality of via nodes, realize that these methods must satisfy occasion and multiple source with a plurality of relayings and transmit two preconditions of signal according to the TDMA form.So just make existing method be only applicable to have the scene of a plurality of relayings, and each information source transmits signal and carry out between different time-gap, so not only cause a lot of time interval resources to be wasted, and reduced the efficiency of transmission of system.
Summary of the invention
In order to solve the above-mentioned technical problem that exists in prior art, the invention provides network coding method when in a kind of multi-source distributed collaborative network, cooperation is empty, comprise the steps:
(1) a plurality of single antenna information sources of described multi-source distributed collaborative network using
, a via node R, and a destination node D;
(2) single antenna information source
Be modulated on its transmitting antenna according to identical MPSK mode producing separately bit source information, single information source is according to the TDMA form, and a plurality of information source while transmission information symbol is to via node R and destination node D;
(3) via node R carries out many antenna receptions, and according to the decoding retransmission protocol, the symbol that a plurality of time slots are obtained carries out the decoding processing, and storage;
Network code when (4) via node R carries out sky divides into groups to the symbol after a plurality of moment decodings, and counts combined signal according to relay antenna, and carries out Space Time Coding according to the relay antenna number and process;
(5) via node R is according to the encoder matrix transmitted signal, and destination node D receives;
(6) destination node D carries out joint maximum likelihood decoding to the signal that receives relaying with from the signal of information source.
Further, the signal section to relay reception when using maximum-likelihood decoding in step (3) carries out change process, realizes the simplification of maximum-likelihood decoding is processed.
Further, described via node R is the base station with many antennas.
Further, each single antenna information source
The bit information that sends is random produces, separate, be independent of each other.
Further, in step (3) via node R to a plurality of antenna receptions to signal carry out joint decoding, obtain a plurality of signals in a plurality of moment.
Further, in step (4), network code when via node R carries out sky to received signal, the symbol that decoding is obtained carries out packet transaction according to the relay antenna number, and define a group network coding vector, and merge processing, obtain a plurality of network codes and merge symbol, then encode according to Space Time Coding, obtain encoder matrix.
Further, via node R is according to the encoder matrix transmitted signal.
Further, in step (6), destination node D adopts the maximum-likelihood decoding mode to carry out to received signal joint decoding, obtains at last the transmitted signal from a plurality of time slots of source node.
Beneficial effect of the present invention: distributed multi-source cooperative system has structure flexibly, and multiple source communication is convenient, and trunk protocol is flexible and changeable, and applicable to the different networks environment; Only use antenna relay more than in model, improved the system complexity that many relayings bring; Network coding method easy to understand when cooperation is empty, convenient operation is easily realized, can save to a great extent the transmission time slot resource, and guarantee systematic function preferably.
Description of drawings:
Fig. 1 is multi-source distributed collaborative network structure;
Fig. 2 is the separate fading channel analogous diagram of using the Jakes model, and carrier frequency is 900MHz, and rate travel is 30m/s;
Fig. 3 is the FB(flow block) of network coding method when in multi-source distributed collaborative network of the present invention, cooperation is empty;
Fig. 4 is receiving terminal BER performance chart during different relay antenna numbers (2 antennas, 4 antennas) in multiple source (2 information sources and 4 information sources) situation;
The BER performance chart that when Fig. 5 is different modulating mode on information source (BPSK and QPSK modulation system), receiving terminal detects.
Embodiment
The below mainly is described in detail the specific embodiment of the present invention by reference to the accompanying drawings.
Network code (cooperation space-time network coding when empty based on the cooperation of relaying decoding forwarding (Decoding and Forward) agreement in multi-source distributed collaborative network of the present invention, CSTNC) method, be illustrated in figure 1 as multi-source distributed collaborative network structure, when as shown in Figure 3, in multi-source distributed collaborative network of the present invention, cooperation is empty, network coding method mainly comprises the steps to carry out:
(1) multi-source distributed collaborative network comprises a plurality of single antenna information sources
, the base station with many antennas is as via node R, and a destination node D, and it is separate that each information source produces bit information;
(2) single antenna information source
Be modulated on its transmitting antenna according to identical MPSK mode producing separately bit source information, single information source is according to the TDMA form, and a plurality of information source while transmission information symbol is to via node R and destination node D;
(3) via node R carries out many antenna receptions, and according to the decoding retransmission protocol, the symbol that a plurality of time slots are obtained carries out the decoding processing, and storage;
Network code when (4) via node R carries out sky divides into groups to the symbol after a plurality of moment decodings, and counts combined signal according to relay antenna, and carries out Space Time Coding according to the relay antenna number and process;
(5) via node R is according to the encoder matrix transmitted signal, and destination node D receives;
(6) destination node D carries out joint maximum likelihood decoding to the signal that receives relaying with from the signal of information source.
Preferably, the signal section to relay reception when using maximum-likelihood decoding carries out certain change process, realizes the simplification of maximum-likelihood decoding is processed.
The below introduces an instantiation of network code when in two information source situations, via node has two antenna time-spaces, as shown in Figure 3, gets
,
Wherein:
(1) multi-source distributed collaborative network comprises two single antenna information sources
, two antenna relay R, and a destination node D;
(2) two information sources will produce separately bit information and be modulated on transmitting antenna according to the QPSK mode, and broadcast at synchronization
Give via node R and destination node D;
(3) via node R carries out many antenna receptions, and in conjunction with the signal that two antenna receptions arrive, the symbol that a plurality of time slots (i.e. 2 time slots or 4 time slots) are obtained carries out the joint decoding processing, and stores;
Network code when (4) via node R carries out sky divides into groups to the symbol after a plurality of moment decodings, and is merged into two signals according to the relay antenna number
With
, and carry out Space Time Coding according to antenna number, namely
(5) via node R is according to above-mentioned encoder matrix transmitted signal, and destination node receives;
(6) destination node D carries out joint maximum likelihood decoding to the signal that receives relaying with from the signal of information source.
Preferably, the signal section that when using maximum-likelihood decoding, via node D is received carries out certain change process, realizes the simplification of maximum-likelihood decoding is processed.
By example is verified, mainly describe by bit error rate performance after receiving terminal decoding.The calculating of the error rate can by the bit information after statistics destination node decoding and two information sources generation bit informations not corresponding the number of error bit number, obtain divided by total amount of bits.For the bit error rate performance simulation curve under different situations, see for details lower shown in Figure 4.Abscissa represents signal to noise ratio, and ordinate represents the error rate.When mainly having provided information source number N=2 in Fig. 4, the relay antenna amount is 2 and 4 o'clock error rate performance curves.And having compared bit error rate performance (being in non-relay situation) under traditional collaboration situation, result reflects that the present invention is greatly improved on performance, and decoding performance becomes better along with the increase of relay antenna number.Fig. 5 reflects the bit error rate performance curve under the different modulating mode, can find out that the performance under the Performance Ratio QPSK modulation under the BPSK modulation will be got well, and along with the increase error rate of relay antenna quantity reduces, improve systematic function.So when the cooperation that the present invention mentions is empty, network coding method can be that a kind of realization is simple, convenient operation, method with the obvious advantage.
The above has been described in detail specific embodiments of the invention by reference to the accompanying drawings, but the present invention is not limited to the above embodiments.In the spirit and scope situation of the claim that does not break away from the application, those skilled in the art can make various modifications or remodeling.
Claims (8)
1. network coding method when in a multi-source distributed collaborative network, cooperation is empty comprises the steps:
(1) a plurality of single antenna information sources of described multi-source distributed collaborative network using
, a via node R, and a destination node D;
(2) single antenna information source
Be modulated on its transmitting antenna according to identical MPSK mode producing separately bit source information, single information source is according to the TDMA form, and a plurality of information source while transmission information symbol is to via node R and destination node D;
(3) via node R carries out many antenna receptions, and according to the decoding retransmission protocol, the symbol that a plurality of time slots are obtained carries out the decoding processing, and storage;
Network code when (4) via node R carries out sky divides into groups to the symbol after a plurality of moment decodings, and counts combined signal according to relay antenna, and carries out Space Time Coding according to the relay antenna number and process;
(5) via node R is according to the encoder matrix transmitted signal, and destination node D receives;
(6) destination node D carries out joint maximum likelihood decoding to the signal that receives relaying with from the signal of information source.
2. network coding method when in multi-source distributed collaborative network as claimed in claim 1, cooperation is empty, it is characterized in that: the signal section to relay reception when using maximum-likelihood decoding in step (3) carries out change process, realizes the simplification of maximum-likelihood decoding is processed.
3. network coding method when in multi-source distributed collaborative network as claimed in claim 1, cooperation is empty, it is characterized in that: described via node R is the base station with many antennas.
4. network coding method when in multi-source distributed collaborative network as claimed in claim 1, cooperation is empty is characterized in that: each single antenna information source
The bit information that sends is random produces, separate, be independent of each other.
5. network coding method when in multi-source distributed collaborative network as claimed in claim 1, cooperation is empty is characterized in that: in step (3) via node R to a plurality of antenna receptions to signal carry out joint decoding, obtain a plurality of signals in a plurality of moment.
6. network coding method when in multi-source distributed collaborative network as claimed in claim 1, cooperation is empty, it is characterized in that: in step (4), network code when via node R carries out sky to received signal, the symbol that decoding is obtained carries out packet transaction according to the relay antenna number, and define a group network coding vector, and merge processing, obtain a plurality of network codes and merge symbol, then encode according to Space Time Coding, obtain encoder matrix.
7. network coding method when in multi-source distributed collaborative network as claimed in claim 6, cooperation is empty, it is characterized in that: via node R is according to the encoder matrix transmitted signal.
8. network coding method when in multi-source distributed collaborative network as claimed in claim 1, cooperation is empty, it is characterized in that: in step (6), destination node D adopts the maximum-likelihood decoding mode to carry out to received signal joint decoding, obtains at last the transmitted signal from a plurality of time slots of source node.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104539397A (en) * | 2015-01-19 | 2015-04-22 | 西安电子科技大学 | De-noising mutual-information keeping quantization forward method of orthogonal frequency division multiple access relay system |
| CN105553536A (en) * | 2015-12-21 | 2016-05-04 | 西安科技大学 | Overlapped code division multiplexing hybrid forwarding cooperative communication method |
| CN109613566A (en) * | 2018-12-11 | 2019-04-12 | 中国电子科技集团公司第五十四研究所 | A kind of credible radio navigation system architecture design method of distribution |
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| CN101771509A (en) * | 2009-01-07 | 2010-07-07 | 中兴通讯股份有限公司 | Orthogonal network space-time coding method and relay transmission system |
| US20120170619A1 (en) * | 2009-07-08 | 2012-07-05 | Electronics And Telecommunications Research Instit | Method for sending and receiving data on a cooperative communications system and a cooperative communications method |
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| CN101771509A (en) * | 2009-01-07 | 2010-07-07 | 中兴通讯股份有限公司 | Orthogonal network space-time coding method and relay transmission system |
| CN101494527A (en) * | 2009-03-05 | 2009-07-29 | 西安电子科技大学 | Time space encoding method of distributed quadrature network |
| US20120170619A1 (en) * | 2009-07-08 | 2012-07-05 | Electronics And Telecommunications Research Instit | Method for sending and receiving data on a cooperative communications system and a cooperative communications method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104539397A (en) * | 2015-01-19 | 2015-04-22 | 西安电子科技大学 | De-noising mutual-information keeping quantization forward method of orthogonal frequency division multiple access relay system |
| CN104539397B (en) * | 2015-01-19 | 2018-01-16 | 西安电子科技大学 | The denoising mutual information for dividing multiple access access relay system is handed over to keep quantifying retransmission method |
| CN105553536A (en) * | 2015-12-21 | 2016-05-04 | 西安科技大学 | Overlapped code division multiplexing hybrid forwarding cooperative communication method |
| CN109613566A (en) * | 2018-12-11 | 2019-04-12 | 中国电子科技集团公司第五十四研究所 | A kind of credible radio navigation system architecture design method of distribution |
| CN109613566B (en) * | 2018-12-11 | 2020-09-01 | 中国电子科技集团公司第五十四研究所 | Distributed credible radio navigation system architecture design method |
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Application publication date: 20130612 |