CN101483817B - Transmitting node power distribution method in multicast network based on regenerated network coding - Google Patents

Transmitting node power distribution method in multicast network based on regenerated network coding Download PDF

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CN101483817B
CN101483817B CN2009100450093A CN200910045009A CN101483817B CN 101483817 B CN101483817 B CN 101483817B CN 2009100450093 A CN2009100450093 A CN 2009100450093A CN 200910045009 A CN200910045009 A CN 200910045009A CN 101483817 B CN101483817 B CN 101483817B
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information source
frame
channel
nights
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CN101483817A (en
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李骏
陈文�
韦莎
陆旭
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Shanghai Jiaotong University
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Abstract

The invention discloses an emergent nodal point power splitting method in multicast network which is based on regenerated network code in wireless communication technology filed. In the invention, as for information source terminals, two information sources s1, s2,at the same time, send broadcast signals to a relay, r and information sinks d1, d2 in a first time slot; the information sink d1 receives the signals from the information source s1 and the information sink d2 receives the signals from the information source s2; the relay r receives the aliasing signals of information sources s1 ands2; the information source power is split according to the known situations of counting channel information and instant s1 r and s2 r channel information; the relay node carries on the maximum likelihood decoding process to the aliasing signals sent by the two information sources in the first time slot; complex field totaling process is carried on to the two signals and the power is separately split for the known situations of counting channel information and instant s1 r and s2 r channel information. The method of the invention can reduce the transmission delay of the system to reduce the frame error rate of the system and improve the thruput of the system.

Description

Based on transmitting node power distribution method in the multicast network of regenerated network coding
Technical field
The present invention relates to a kind of method of wireless communication technology field, specifically is a kind of based on transmitting node power distribution method in the multicast network of regenerated network coding.
Background technology
In traditional wireless relay network, because the restriction of information source transmitting power, relaying generally is used to enlarge the transmission range of information source.And in the wireless cooperative network that proposes in recent years, relaying then is used to increase the diversity gain of source signal, to reduce the error probability of message transmission.In these communication processs, via node is after the information of reception sources node, and the mode that adopts storage to transmit is not carried out any data processing.At present, the network code theory that occurs in computer network is a kind of effective ways that can significantly improve network capacity, and it improves the message transmission rate of whole network by the data processing that intermediate node carried out in network.Based on the network code Study on Theory in the computer network of cable network, become a big focus of academia in recent years.Yet in wireless network, because the phase mutual interference of decline, noise and the electromagnetic signal of channel, the application of network code is comparatively complicated.The existing wireless network code is confined to two kinds of models at present: bidirectional information flow model and multiple access model.Yet in complicated day by day network environment, these two kinds of models are difficult to be widely used.
Find by prior art documents, P.Popovski and H.Yomo is at IEEECommunications Letters (ieee communication) (vol.11, no.1, pp.16-18, Jan.2007.) deliver " Wireless network coding by amplify-and-forward for bi-directionaltraffic flows; " (Wireless Network Coding under the bidirectional information flow model) proposed a kind of bidirectional information flow model in this article.In this model, two information sources are carried out information exchange and have been adopted network code at node by some via nodes, thereby have increased the throughput of whole system;
Also find by retrieval, T.Wang and G.B.Giannakis is in Proc.of 41st AnnualInternational Conference on Information Sciences and Systems (CISS) (the 41st International Year meeting of information science and systems), Baltimore, MD, Mar.14-16,2007, pp.253-258. deliver " High-throughput cooperative communications with complexfield network coding; " (based on the high-throughput cooperation communication system of complex field network code) proposed a kind of multiple access model in this article.In this model, a plurality of information sources transmit to a stay of two nights and some via nodes simultaneously, and via node carries out network code after receiving the signal of information source, and is transmitted to information destination node, thereby provides diversity gain for information source under high-throughput.Bidirectional information flow model and multiple access model are the only two kinds of models of Wireless Network Coding, yet in complicated day by day network environment, these two kinds of models are difficult to be widely used.
Summary of the invention
The objective of the invention is at above-mentioned the deficiencies in the prior art, proposed a kind of based on transmitting node power distribution method in the multicast network of regenerated network coding, adopt a kind of by double source, the multicast network that Shuan Su and single relaying are formed, two stays of two nights all need to obtain the information of each information source, because the information source transmitting power is limited, signal can't be intersected transmission, therefore, via node will be responsible for transmitting the information of each information source, at this model, Wireless Network Coding based on symbol stack has been proposed to reduce the transmission delay of network at via node, the distribution method that has proposed the network node transmitting power simultaneously is with reduction system frame error rate, thus the high efficiency of transmission of realization wireless network data.
The present invention is achieved through the following technical solutions, the present invention includes following steps:
Step 1, for the information source end, two information source s 1, s 2At first time slot simultaneously to relaying r and stay of two nights d 1, d 2Broadcast singal, stay of two nights d 1Receive information source s 1Signal, stay of two nights d 2Receive information source s 2Signal, and relaying r receives information source s 1With information source s 2Aliasing signal, at the known and instantaneous s of statistic channel information 1→ r and s 2The situation that → r channel information is known is done following processing respectively, the frame error rate in the system-frame of reduction multicast network:
Because the symmetry of system channel model selects two information sources to have identical transmitting power;
At the instantaneous s of information source end 1→ r and s 2When → r channel information is known, because the emission symbol of any one information source is translated the wrong generation that all will cause system's mistake frame incident at relaying, according to instantaneous channel information maximization s 1→ r and s 2That of instantaneous received signal to noise ratio minimum in the → r channel distributes with this power to information source;
Step 2, via node carries out joint maximum likelihood decoding to the aliasing signal of two information source emissions in first time slot, and two signals are carried out the complex field addition, at the known and instantaneous r → d of statistic channel information 1And r → d 2The situation that channel information is known is done following processing respectively:
Under the known situation of statistic channel information,, distribute the power of information source and relaying simultaneously according to statistic channel information because the symmetry of system channel model is carried out the constant power addition with the symbol after two decodings;
At the instantaneous r → d of information source end 1And r → d 2When channel information was known, because the emission symbol of any one information source is translated the wrong generation that all will cause system's mistake frame incident at relaying, then two symbols should be according to instantaneous r → d before stack 1And r → d 2Channel information carries out power division, distributes the power of information source and relaying simultaneously according to instantaneous signal information.
Described system-frame, be meant an information frame of forming by two information sources transmission symbol separately, the length of a system-frame of definition is 2, wherein, the transmission time of system-frame is 2 time slots, be that each stay of two nights will receive 2 symbols by two information source transmission in 2 time slots, 1 symbol is from information source s 1, other 1 symbol is from information source s 2
Frame error rate in the described system-frame is meant because two stays of two nights all need the correct simultaneously system-frame that receives, therefore, when any one stay of two nights does not have correct receiving system frame, generation systems mistake frame incident, the expression formula of system's frame error rate is as follows: P Sys=P D1(1-P D2)+P D2(1-P D1)=P D1+ P D2-P D1P D2, wherein, P DkBe the frame error rate of k the stay of two nights, from the definition of system's frame error rate expression formula as can be known, the correct simultaneously frames that receive of two stays of two nights that and if only if think that just a frame is by the transmission of success.
Described statistic channel information is known, is meant that channel obedience probability statistics distribute, and has average and variance, and information source and relaying all can obtain the situation of channel information.
Compared with prior art, the present invention has following beneficial effect:
(1) the present invention has proposed the scheme of two kinds of network codes in multicast network, and the transmission plan of coding Network Based can reduce the transmission delay of system;
(2) the present invention proposes power allocation scheme, significantly reduced system's frame error rate, improved the throughput of system based on statistic channel information;
(3) the present invention proposes power allocation scheme, further reduce system's frame error rate based on instantaneous channel information.
Description of drawings
Fig. 1 is a multicast network channel mapping of the present invention;
Fig. 2 is the system's frame error rate curve comparison diagram under four kinds of transmission plans in the embodiments of the invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
The multicast network unit that relates to Liang Yuan, a Liang Su, single relaying in the present embodiment, as shown in Figure 1.Each stay of two nights all needs to receive the information of two information sources, because the through-put power of signal and be limited in scope d 1Do not receive s 2Information, d simultaneously 2Also can't receive s 1Information, the transmission range of via node r has then covered two stays of two nights, and can assist two information sources that information is sent to the stay of two nights.
In the present embodiment, defining a system-frame is x s=[x S1, x S2], x wherein S1Be s 1The symbol of emission.Suppose that all symbols are all from 2 RIndependent random is chosen on-qam constellation the figure, and the average energy of symbol is 2E.It is 0 that communication channel is average, and variance is 1 rayleigh distributed.The variance that each receiver observes is 0 average, and variance is σ 2Gaussian Profile.The signal to noise ratio of define system is ρ = E σ 2 . Use κ kThe power division of representing k information source is represented the power division of relaying r with τ, and after the r decoding success, the energy of two decoding of Fen Pei Give symbol are respectively τ 1And τ 2, τ is then arranged 1+ τ 2=τ, definition in addition κ = Δ κ 1 + κ 2 。According to the definition of system's frame error rate, and if only if d 1And d 2Correctly receive simultaneously x sThe time, then a system-frame is by the transmission of success.Because the decoding of relaying mistake will directly cause the generation of system's mistake frame incident, therefore can again system's frame error rate be written as:
P sys=P r+(1-P r)(P d1|r+P d2|r-P d1|rP d2|r)
Wherein, P rBe the joint decoding error probability of via node r, P D1|r(P D2|r) be stay of two nights d 1(d 2) probability of erroneous decoding when the r correct decoding.
Present embodiment comprises the steps:
Step 1, for the information source end, two information sources at first time slot simultaneously to relaying and stay of two nights broadcast singal, stay of two nights d 1Receive information source s 1Signal, stay of two nights d 2Receive information source s 2Signal, and relaying r receives information source s 1With information source s 2Aliasing signal, in order to reduce system's frame error rate of multicast network, do following processing respectively:
1. under the known situation of statistic channel information,, then have because the symmetry of channel model and channel parameter is selected to distribute to two power division factors that information source is identical κ 1 = κ 2 = 1 2 κ ;
2. at instantaneous s 1→ r and s 2Under the known situation of → r channel information, further optimize power allocation scheme.When relaying r does joint maximum likelihood decoding to the aliasing signal of two information sources, in order to maximize s 1→ r and s 2The channel capacity of minimum makes I (s in the → r channel 1R|g 1, g 2)=I (s 2R|g 1, g 2), then obtain instantaneous s 1→ r and s 2Power allocation scheme is as follows between the information source under the → r channel information:
κ 1 = κ | g 2 | 2 | g 1 | 2 + | g 2 | 2 , κ 2 = κ | g 1 | 2 | g 1 | 2 + | g 2 | 2 ;
Step 2, via node carries out joint maximum likelihood decoding to the aliasing signal of two information source emissions in first time slot, and two signals are carried out the complex field addition, at the known and instantaneous r → d of statistic channel information 1And r → d 2The situation that channel information is known is done following processing respectively:
1. under the known situation of statistic channel information based on the lagrangian optimization equation of minimization system frame error rate expression formula, obtain the optimal power allocation of information source and via node, specific as follows:
Obtain system's frame error rate expression formula under the known situation of statistic channel information, there is following relation in the frame error rate under the statistic channel information:
P sys ~ 2 R - 1 κ + 2 τ
Set up Lagrange's equation and minimize P power constraint condition κ+τ=1 time Sys, then the available power allocative decision is:
κ = 2 R - 1 + 2 2 R - 1 + 2 + 1 , τ = 1 2 R - 1 + 2 + 1 ;
2. at the instantaneous channel r → d of information source end 1And r → d 2During ten-four, because the emission symbol of any one information source is translated the wrong generation that all will cause system's mistake frame incident at relaying, then two symbols should be according to instantaneous channel r → d before stack 1And r → d 2Carry out power division, distribute the power of information source and relaying simultaneously according to instantaneous signal information, to obtain new κ, τ 1And τ 2Numerical value owing to be difficult to obtain, then minimize the sum reciprocal of each receiving terminal instantaneous signal-to-noise ratio, promptly at power constraint κ+τ based on system's frame error rate of instantaneous channel information 1+ τ 2Minimize formula=1 time:
2 R - 1 κ | g | 2 + 1 τ 1 | h 2 | 2 + 1 τ 2 | h 1 | 2
Wherein g = | g 1 g 2 | 2 | g 1 | 2 + | g 2 | 2 , By setting up the lagrangian optimization equation, obtain power division and be:
κ = η 2 R - 1 η 2 R - 1 + 1 , τ = 1 η 2 R - 1 + 1 , τ 1 = τ | h 1 | | h 1 | + | h 2 | , τ 2 = τ | h 2 | | h 1 | + | h 2 |
Wherein η = | h 1 h 2 | 2 ( | g 1 | 2 + | g 2 | 2 ) | g 1 g 2 | 2 ( | h 1 | 2 + | h 2 | 2 ) , So far, obtained the power allocation scheme of instantaneous channel information.
The purpose of present embodiment is the regenerated network coding of physical layer is introduced the wireless multicast network, to improve the throughput of system.
For via node, in traditional transmission mode, i.e. first slot s 1Broadcast singal is to r and d 1, second time slot r sends signal to d 2, the 3rd slot s 2Broadcast singal is to r iAnd d 2, the 4th time slot r iSend signal to d 1
Yet in the regenerated network coding scheme, utilize electromagnetic broadcast characteristic, the method that can adopt analog network coding is compressed to two time slots, i.e. first time slot: s with the transmission course of above-mentioned four time slots 1And s 2The information of broadcasting simultaneously oneself.D then 1Receive s 1Signal, d 2Receive s 2Signal, r receives s 1And s 2Aliasing signal.Second time slot, r carries out joint maximum likelihood decoding to the aliasing signal that receives, and then the symbol after the decoding is carried out network code, be about to decipher symbol and superpose in complex field, and the symbol after will superposeing is broadcast to two stays of two nights.Because d 1(d 2) received s at first time slot 1(s 2) information, so d 1(d 2) can from the signal of r transmission, extract s 2(s 1) information.
As seen, adopt the scheme of regenerated network coding transmission delay can be reduced to 2 time slots by 4 traditional time slots, the cost of paying is because the signal aliasing of via node causes the rising of frame error rate and the decline of systematic function.In order to improve systematic function, the method that has proposed power division further increases network throughput.
As shown in Figure 2, compared the system's frame error rate under four kinds of transmission plans respectively, be respectively: 1. during transmission rate R=2BPCU, optimal power allocation scheme (2BPCU based on statistic channel information, OSPAS), 2. during transmission rate R=2BPCU, based on the optimal power allocation scheme of instantaneous channel information (2BPCU, IPAS), 3. during transmission rate R=4BPCU, based on the optimal power allocation scheme of statistic channel information (4BPCU, OSPAS), 2. during transmission rate R=4BPCU, optimal power allocation scheme (4BPCU based on instantaneous channel information, IPAS), abscissa wherein is the signal to noise ratio ρ of system, and ordinate is the frame error rate of system.As seen from Figure 2, the power division side based on instantaneous channel information has better system performance.

Claims (4)

1. one kind based on transmitting node power distribution method in the multicast network of regenerated network coding, it is characterized in that, comprises the steps:
Step 1, for the information source end, two information source s 1, s 2At first time slot simultaneously to relaying r and stay of two nights d 1, d 2Broadcast singal, stay of two nights d 1Receive information source s 1Signal, stay of two nights d 2Receive information source s 2Signal, and relaying r receives information source s 1With information source s 2Aliasing signal, at the known and instantaneous s of statistic channel information 1→ r and s 2The situation that → r channel information is known is the frame error rate in the system-frame that reduces multicast network, does following processing respectively:
1. because the symmetry of system channel model selects two information sources to have identical transmitting power;
2. because the emission symbol of any one information source is translated the wrong generation that all will cause system's mistake frame incident at relaying, according to instantaneous channel information maximization s 1→ r and s 2That of instantaneous received signal to noise ratio minimum in the → r channel distributes with this power to information source;
Step 2, via node carries out joint maximum likelihood decoding to the aliasing signal of two information source emissions in first time slot, and two signals are carried out the complex field addition, at the known and instantaneous r → d of statistic channel information 1And r → d 2The situation that channel information is known is done following processing respectively:
1. because the symmetry of system channel model is carried out the constant power addition with the symbol after two decodings, distribute the power of information source and relaying simultaneously according to statistic channel information;
2. because the emission symbol of any one information source is translated the wrong generation that all will cause system's mistake frame incident at relaying, then two symbols should be according to instantaneous r → d before stack 1And r → d 2Channel information carries out power division, distributes the power of information source and relaying simultaneously according to instantaneous signal information.
2. according to claim 1 based on transmitting node power distribution method in the multicast network of regenerated network coding, it is characterized in that, described system-frame, be meant an information frame of forming by two information sources transmission symbol separately, the length of a system-frame of definition is 2, and wherein, the transmission time of system-frame is 2 time slots, be that each stay of two nights will receive 2 symbols by two information source transmission in 2 time slots, 1 symbol is from information source s 1, other 1 symbol is from information source s 2
3. according to claim 1 based on transmitting node power distribution method in the multicast network of regenerated network coding, it is characterized in that, frame error rate in the described system-frame, be meant because two stays of two nights all need the correct simultaneously system-frame that receives, when any one stay of two nights does not have correct receiving system frame, generation systems mistake frame incident, the expression formula of system's frame error rate is as follows: P Sys=P D1(1-P D2)+P D2(1-P D1)+P D1P D2=P D1+ P D2-P D1P D2, wherein, P DkBe the frame error rate of k the stay of two nights, from the definition of system's frame error rate expression formula as can be known, the correct simultaneously frames that receive of two stays of two nights that and if only if think that just a frame is by the transmission of success.
4. according to claim 1 based on transmitting node power distribution method in the multicast network of regenerated network coding, it is characterized in that described statistic channel information is known, be meant that channel obedience probability statistics distribute, have average and variance, information source and relaying all can obtain the situation of channel information.
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CN102123490B (en) * 2011-04-21 2013-03-27 重庆大学 Power distribution method of two-way multi-hop network based on physical layer network coding
CN102186231A (en) * 2011-06-01 2011-09-14 北京邮电大学 Power distribution mechanism for decode-and-forward relay system
CN102547594B (en) * 2012-01-10 2015-06-03 北京交通大学 Method for determining upper limit of transmission rate of self-adaptive collaborative wireless multicast communication data
CN103533000B (en) * 2012-07-05 2016-12-21 华为技术有限公司 Measure signal transmission/reconstructing method, relevant device and wireless sensor network
CN110944377B (en) * 2019-10-22 2024-02-02 浙江理工大学 Distribution method and system of network coding protocol power based on channel statistical information

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