CN102035629A - Network coding method based on multi-antenna pre-coded bidirectional relay system - Google Patents

Network coding method based on multi-antenna pre-coded bidirectional relay system Download PDF

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CN102035629A
CN102035629A CN2010106134139A CN201010613413A CN102035629A CN 102035629 A CN102035629 A CN 102035629A CN 2010106134139 A CN2010106134139 A CN 2010106134139A CN 201010613413 A CN201010613413 A CN 201010613413A CN 102035629 A CN102035629 A CN 102035629A
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base station
user
relaying
matrix
signal
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CN102035629B (en
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王超
陈晓明
王玮
张朝阳
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The invention discloses a network coding method based on a multi-antenna pre-coded bidirectional relay system. A base station and a user pre-code the transmit signals of the base station and the user and send the signals; and then after performing network coding on the received aliasing signals, a relay broadcasts the signals to the base station and the user. In the network coding method based on a bidirectional relay, two time slots are adopted for transmission, wherein in the first time slot, the base station and the user send the pre-coded signals to the relay at the same time; in the second time slot, the relay broadcasts the pre-coded signals; and after receiving the signals, the base station and the user subtract the self signal parts from the broadcast signals and demodulate the left signals so as to acquire the signals from the opposite part. Due to the introduction of multi-antenna pre-coding technology, the characteristic of high capacity of the bidirectional relay is kept and interference caused by bidirectional transmission is reduced, so that the error rate of the system is reduced.

Description

Network coding method based on the two-way relay system of many antennas precoding
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of network coding method of the two-way relay system based on the precoding of many antennas.
Background technology
Along with development of wireless communication devices, International Telecommunication Union has proposed very high communicating requirement for the system of broadband wireless communication IMT-Advanced of a new generation, and will support very high bandwidth and frequency, therefore causes the area coverage of base station to dwindle.Therefore, in order to reduce networking cost and Extended Cell coverage rate, improve the service quality of Cell Edge User, relaying becomes the emphasis that the communications field is paid close attention to.
The research about relaying technique in early stage is based on one-way communication, promptly in a time slot, relaying only transmits for the down link (base station is to the user) or the information of up link (user is to the base station), use this transmission method to finish information interaction between base station and user, need 4 time slots.Wherein first time slot sends information by the base station to relaying, and second time slot sends information by relaying to the user, and the 3rd time slot user sends information to relaying, and the 4th time slot relaying sends information to the base station.The introducing of relaying makes needs the information interaction of 2 time slots to become 4 time slots originally, has reduced spectrum efficiency.The two-way relaying research of coding techniques Network Based in recent years becomes focus, because the two-way relaying of coding techniques Network Based can make the auxiliary communication system of relaying can finish the transmission of up link and down link in two time slots.First time slot, base station and user send information to relaying simultaneously, and relaying obtains carrying out network code after the aliasing information.Second time slot, relaying is broadcasted the signal of handling well, and user and base station use network coding technique that self signal section is carried out Interference Cancellation after receiving broadcast singal, can demodulate the signal that self needs then from the signal of remainder.Therefore, in relay system, use network coding technique, can significantly promote spectrum efficiency, increase power system capacity.And multiaerial system can be by utilizing spatial reuse gain and space diversity gain, can be under identical bandwidth enhanced system transmission capacity or increase the reliability of transmission, be one of key technology of new generation of wireless communication system.Therefore with many antennas relay system of above-mentioned two kinds of technology combinations, the further performance of elevator system.
Summary of the invention
The network coding method that the purpose of this invention is to provide a kind of two-way relay system based on the precoding of many antennas, be that base station and user carried out precoding according to existing channel status to sending signal before sending signal, the network coding technique that cooperates relaying to use, significantly reduce the interference of two-way communication, reduced the error rate.
The technical solution used in the present invention is:
Base station and user carry out sending after the precoding to transmitting separately, and relaying carries out being broadcast to base station and user behind the network code to the aliasing signal that receives then; Specifically comprise the steps:
Pre-coding matrix is used in step (1.1) base station
Figure 2010106134139100002DEST_PATH_IMAGE002
To transmitting
Figure 2010106134139100002DEST_PATH_IMAGE004
Carry out precoding processing, the user uses pre-coding matrix simultaneously
Figure 2010106134139100002DEST_PATH_IMAGE006
To transmitting
Figure 2010106134139100002DEST_PATH_IMAGE008
Carry out precoding processing;
Step (1.2) is at first time slot, and base station and user be the information after relaying sends precoding separately simultaneously
Figure 2010106134139100002DEST_PATH_IMAGE010
With
Figure DEST_PATH_IMAGE012
, relaying receives aliasing signal , wherein
Figure DEST_PATH_IMAGE016
Be the channel of base station to relaying,
Figure DEST_PATH_IMAGE018
Be the channel of user to relaying,
Figure DEST_PATH_IMAGE020
Reception noise for the relaying place;
Step (1.3) relaying is to aliasing signal Use matrix
Figure DEST_PATH_IMAGE024
Carry out forming broadcast singal after the precoding
Figure DEST_PATH_IMAGE026
Step (1.4) is at second time slot, repeat transmitted broadcast singal
Figure DEST_PATH_IMAGE028
, system works then is relayed to the base station and is respectively to user's channel in the time division duplex environment
Figure DEST_PATH_IMAGE030
With
Figure DEST_PATH_IMAGE032
, subscript wherein The conjugate transpose of representing matrix, base station and user receive that respectively signal is
Figure DEST_PATH_IMAGE036
With
Figure DEST_PATH_IMAGE038
,
Wherein
Figure DEST_PATH_IMAGE040
With
Figure DEST_PATH_IMAGE042
Be respectively the reception noise of base station and user side;
Each deducts self signal section step (1.5) base station and user in the signal of receiving, obtain signal respectively
Figure DEST_PATH_IMAGE044
With
Figure DEST_PATH_IMAGE046
Step (1.6) base station and user are separately to handling the back signal With
Figure DEST_PATH_IMAGE050
Decipher, decoding matrix is respectively
Figure DEST_PATH_IMAGE052
With
Figure DEST_PATH_IMAGE054
, the decode results that obtains separately is
Figure DEST_PATH_IMAGE056
With
Figure DEST_PATH_IMAGE058
The pre-coding matrix of described step (1.1) lining
Figure 716974DEST_PATH_IMAGE002
With , the relaying encoder matrix in the step (1.3)
Figure 450761DEST_PATH_IMAGE024
,And the decoding matrix in the step (1.6)
Figure 788201DEST_PATH_IMAGE052
With
Figure 431672DEST_PATH_IMAGE054
Choose, the method for choosing is to satisfy under the condition of transmission power limit at base station, user and relaying, seeks matrix
Figure 197744DEST_PATH_IMAGE024
Figure 758038DEST_PATH_IMAGE052
Figure 529685DEST_PATH_IMAGE054
Make that the error rate of system is minimum, promptly minimize
Figure DEST_PATH_IMAGE060
Wherein
Figure DEST_PATH_IMAGE062
Be the minimized function of needs,
Figure DEST_PATH_IMAGE064
The mark of representing matrix,
Figure DEST_PATH_IMAGE066
The expression mathematic expectaion, base station transmit signals satisfies Power Limitation
Figure DEST_PATH_IMAGE068
, the user transmits and satisfies Power Limitation
Figure DEST_PATH_IMAGE070
, the repeat transmitted signal satisfies Power Limitation
Figure DEST_PATH_IMAGE072
, wherein
Figure DEST_PATH_IMAGE074
,
Figure DEST_PATH_IMAGE076
With
Figure DEST_PATH_IMAGE078
Be respectively the base station, the transmitting power of user and relaying,
Figure DEST_PATH_IMAGE080
,
Figure DEST_PATH_IMAGE082
With
Figure DEST_PATH_IMAGE084
Be respectively the base station, the maximum transmit power limit of user and relaying; Calculation code matrix step is as follows:
(2.1)
Figure 2296DEST_PATH_IMAGE060
Contain
Figure DEST_PATH_IMAGE086
Individual unknown number is designated as vector , wherein
Figure DEST_PATH_IMAGE090
,
Figure DEST_PATH_IMAGE092
With
Figure DEST_PATH_IMAGE094
Be respectively the base station, the antenna number of user and relaying,
Figure DEST_PATH_IMAGE096
, wherein
Figure DEST_PATH_IMAGE098
Expression launches to embark on journey vector with matrix by row;
(2.2) given initial interior point
Figure DEST_PATH_IMAGE100
, permissible error
Figure DEST_PATH_IMAGE102
, initial parameter
Figure DEST_PATH_IMAGE104
, coefficient of reduction
Figure DEST_PATH_IMAGE106
, put
Figure DEST_PATH_IMAGE108
(2.3) order
Figure DEST_PATH_IMAGE110
, wherein
Figure DEST_PATH_IMAGE112
, with
Figure DEST_PATH_IMAGE114
Be initial point, separate with steepest descent method
Figure DEST_PATH_IMAGE116
, try to achieve minimal point and be
Figure DEST_PATH_IMAGE118
(2.4) if Then stop to calculate, obtain a little
Figure 71752DEST_PATH_IMAGE118
Otherwise order
Figure DEST_PATH_IMAGE122
, put
Figure DEST_PATH_IMAGE124
, return step (2.3);
Wherein the steepest descent method in the step (2.3) is separated
Figure DEST_PATH_IMAGE126
Concrete steps are as follows:
(2.3.1) put given initial point
, permissible error , put
Figure DEST_PATH_IMAGE132
(2.3.2) calculate the direction of search
Figure DEST_PATH_IMAGE134
(2.3.3) if
Figure DEST_PATH_IMAGE136
, then stop to calculate, with season Otherwise from
Figure DEST_PATH_IMAGE140
Set out and carry out linear search, ask
Figure DEST_PATH_IMAGE142
Make
(2.3.4) order
Figure DEST_PATH_IMAGE146
, put
Figure DEST_PATH_IMAGE148
, go to step (2.3.2).
The beneficial effect that the present invention has is:
Base station and user carried out precoding according to existing channel status to sending signal before sending signal, the network coding technique that cooperates relaying to use, significantly reduced the interference between two-way communication, reduced the error rate, guaranteed that simultaneously two-way relaying itself has the characteristics of high power system capacity.
Description of drawings
Fig. 1 is the entire block diagram of the two-way junction network coded system of many antennas.
Fig. 2 is in the base station, and user and relaying all are equipped with under 2 antenna situations, has the network code performance of precoding and only has relaying to carry out the error rate comparison diagram of network code.
Embodiment
The two-way junction network coded system of many antennas as shown in Figure 1, user wherein, base station and relaying all are equipped with many antennas, its quantity is respectively
Figure 985088DEST_PATH_IMAGE092
, With
Figure 427888DEST_PATH_IMAGE094
The base station to the channel of relaying is
Figure 910822DEST_PATH_IMAGE016
, the user to the channel of relaying is
Figure 383391DEST_PATH_IMAGE018
, base station and user can obtain channel information by use channel reciprocity in tdd systems or by feedback, thereby can carry out precoding.Two-way relaying carries out two slot transmission, first time slot sends a signal to relaying simultaneously by base station and user, at second time slot broadcast singal, base station and user deduct self part signal and decipher after receiving broadcast singal after relaying carries out network code, obtain the information that needs.Concrete steps are as follows:
Pre-coding matrix is used in step (1.1) base station To transmitting
Figure 982924DEST_PATH_IMAGE004
Carry out precoding processing, the user uses pre-coding matrix simultaneously
Figure 269548DEST_PATH_IMAGE006
To transmitting
Figure 393362DEST_PATH_IMAGE008
Carry out precoding processing;
Step (1.2) is at first time slot, and base station and user be the information after relaying sends precoding separately simultaneously
Figure 677713DEST_PATH_IMAGE010
With
Figure 152557DEST_PATH_IMAGE012
, relaying receives aliasing signal
Figure 180556DEST_PATH_IMAGE014
, wherein
Figure 925920DEST_PATH_IMAGE016
Be the channel of base station to relaying, Be the channel of user to relaying,
Figure 77733DEST_PATH_IMAGE020
Reception noise for the relaying place;
Step (1.3) relaying is to aliasing signal
Figure 706160DEST_PATH_IMAGE022
Use matrix
Figure 7828DEST_PATH_IMAGE024
Carry out forming broadcast singal after the precoding
Figure 430719DEST_PATH_IMAGE026
Step (1.4) is at second time slot, repeat transmitted broadcast singal
Figure 817838DEST_PATH_IMAGE028
, system works then is relayed to the base station and is respectively to user's channel in the time division duplex environment
Figure 748492DEST_PATH_IMAGE030
With
Figure 701405DEST_PATH_IMAGE032
, subscript wherein
Figure 498459DEST_PATH_IMAGE034
The conjugate transpose of representing matrix, base station and user receive that respectively signal is
Figure 169612DEST_PATH_IMAGE036
With
Figure 343104DEST_PATH_IMAGE038
,
Wherein
Figure 416103DEST_PATH_IMAGE040
With
Figure 384059DEST_PATH_IMAGE042
Be respectively the reception noise of base station and user side;
Each deducts self signal section step (1.5) base station and user in the signal of receiving, obtain signal respectively
Figure 43972DEST_PATH_IMAGE044
With
Figure 817893DEST_PATH_IMAGE046
Step (1.6) base station and user are separately to handling the back signal
Figure 683081DEST_PATH_IMAGE048
With Decipher, decoding matrix is respectively
Figure 467683DEST_PATH_IMAGE052
With
Figure 779716DEST_PATH_IMAGE054
, the decode results that obtains separately is
Figure 764990DEST_PATH_IMAGE056
With
Figure 635600DEST_PATH_IMAGE058
The pre-coding matrix of step (1.1) lining
Figure 768641DEST_PATH_IMAGE002
With
Figure 822048DEST_PATH_IMAGE006
, the relaying encoder matrix in the step (1.3)
Figure 724145DEST_PATH_IMAGE024
,And the decoding matrix in the step (1.6)
Figure 267122DEST_PATH_IMAGE052
With
Figure 559563DEST_PATH_IMAGE054
Choose.The method of choosing is to satisfy under the condition of transmission power limit at base station, user and relaying, seeks matrix
Figure 980442DEST_PATH_IMAGE002
Figure 674729DEST_PATH_IMAGE006
Figure 388607DEST_PATH_IMAGE024
Figure 891449DEST_PATH_IMAGE054
Make that the error rate of system is minimum.In order to guarantee optimized characteristic, these 5 parameters are carried out combined optimization can obtain best performance.Concrete grammar is to use interior point method to separate the distance problem that minimizes received signal and original signal under the power constraint.Wherein base station transmit signals satisfies Power Limitation
Figure 440242DEST_PATH_IMAGE068
, the user transmits and satisfies Power Limitation
Figure 590601DEST_PATH_IMAGE070
, the repeat transmitted signal satisfies Power Limitation
Figure 418486DEST_PATH_IMAGE072
, wherein
Figure 617386DEST_PATH_IMAGE074
,
Figure 83003DEST_PATH_IMAGE076
With
Figure 404263DEST_PATH_IMAGE078
Be respectively the base station, the transmitting power of user and relaying,
Figure 158592DEST_PATH_IMAGE080
,
Figure 957921DEST_PATH_IMAGE082
With
Figure 45088DEST_PATH_IMAGE084
Be respectively the base station, the maximum transmit power limit of user and relaying.And the matrix system of selection that can guarantee error rate of system is the decode results that makes With
Figure DEST_PATH_IMAGE152
With primary signal
Figure 537249DEST_PATH_IMAGE008
With The spacing minimum promptly minimizes
Figure 178632DEST_PATH_IMAGE060
, wherein
Figure 822103DEST_PATH_IMAGE062
Be the minimized function of needs,
Figure 718121DEST_PATH_IMAGE064
The mark of representing matrix,
Figure 447043DEST_PATH_IMAGE066
The expression mathematic expectaion, use interior point method to ask the step of encoder matrix as follows:
(2.1) Contain
Figure 86152DEST_PATH_IMAGE086
Individual unknown number is designated as vector
Figure 654536DEST_PATH_IMAGE088
, wherein
Figure 933071DEST_PATH_IMAGE090
, With
Figure 731842DEST_PATH_IMAGE094
Be respectively the base station, the antenna number of user and relaying,
Figure 674390DEST_PATH_IMAGE096
,Wherein
Figure 174641DEST_PATH_IMAGE098
Expression launches to embark on journey vector with matrix by row;
(2.2) given initial interior point , permissible error
Figure 130145DEST_PATH_IMAGE102
, initial parameter
Figure 40332DEST_PATH_IMAGE104
, coefficient of reduction
Figure 965563DEST_PATH_IMAGE106
, put
Figure 774160DEST_PATH_IMAGE108
(2.3) order , wherein
Figure 447904DEST_PATH_IMAGE112
, with
Figure 922748DEST_PATH_IMAGE114
Be initial point, separate with steepest descent method , try to achieve minimal point and be
Figure 929067DEST_PATH_IMAGE118
(2.4) if
Figure 384319DEST_PATH_IMAGE120
Then stop to calculate, obtain a little Otherwise order
Figure 476351DEST_PATH_IMAGE122
, put
Figure 512440DEST_PATH_IMAGE124
, return step (2.3);
Wherein the steepest descent method in the step (2.3) is separated
Figure 200911DEST_PATH_IMAGE126
Concrete steps are as follows:
(2.3.1) put given initial point
Figure 650347DEST_PATH_IMAGE128
, permissible error
Figure 315421DEST_PATH_IMAGE130
, put
Figure 471596DEST_PATH_IMAGE132
(2.3.2) calculate the direction of search
Figure 330967DEST_PATH_IMAGE134
(2.3.3) if
Figure 939803DEST_PATH_IMAGE136
, then stop to calculate, with season
Figure 175612DEST_PATH_IMAGE138
Otherwise from Set out and carry out linear search, ask
Figure 216567DEST_PATH_IMAGE142
Make
Figure 876480DEST_PATH_IMAGE144
(2.3.4) order
Figure 322505DEST_PATH_IMAGE146
, put
Figure 515589DEST_PATH_IMAGE148
, go to step (2.3.2).
After calculating above encoder matrix, just can carry out precoding and network code,, reduce in the two-way relaying because the interference that signal aliasing causes to the result that all parameters are carried out global optimization, because the introducing of precoding has reduced the influence of channel, reduced the error rate simultaneously.Emulation by computer shows (see figure 2), by introducing the method that global optimization is carried out in precoding simultaneously, than only carrying out network code at relaying the lower error rate is arranged.

Claims (2)

1. network coding method based on the two-way relay system of many antennas precoding, it is characterized in that: base station and user carry out sending after the precoding to transmitting separately, and relaying carries out being broadcast to base station and user behind the network code to the aliasing signal that receives then; Specifically comprise the steps:
Pre-coding matrix is used in step (1.1) base station
Figure 2010106134139100001DEST_PATH_IMAGE001
To transmitting
Figure 91763DEST_PATH_IMAGE002
Carry out precoding processing, the user uses pre-coding matrix simultaneously
Figure 2010106134139100001DEST_PATH_IMAGE003
To transmitting
Figure 298360DEST_PATH_IMAGE004
Carry out precoding processing;
Step (1.2) is at first time slot, and base station and user be the information after relaying sends precoding separately simultaneously
Figure 2010106134139100001DEST_PATH_IMAGE005
With
Figure 610393DEST_PATH_IMAGE006
, relaying receives aliasing signal , wherein
Figure 720300DEST_PATH_IMAGE008
Be the channel of base station to relaying,
Figure 2010106134139100001DEST_PATH_IMAGE009
Be the channel of user to relaying,
Figure 593841DEST_PATH_IMAGE010
Reception noise for the relaying place;
Step (1.3) relaying is to aliasing signal
Figure 2010106134139100001DEST_PATH_IMAGE011
Use matrix Carry out forming broadcast singal after the precoding
Figure 2010106134139100001DEST_PATH_IMAGE013
Step (1.4) is at second time slot, repeat transmitted broadcast singal
Figure 904922DEST_PATH_IMAGE014
, system works then is relayed to the base station and is respectively to user's channel in the time division duplex environment
Figure 2010106134139100001DEST_PATH_IMAGE015
With
Figure 305554DEST_PATH_IMAGE016
, subscript wherein
Figure 2010106134139100001DEST_PATH_IMAGE017
The conjugate transpose of representing matrix, base station and user receive that respectively signal is
Figure 910848DEST_PATH_IMAGE018
With
Figure 2010106134139100001DEST_PATH_IMAGE019
,
Wherein With
Figure 2010106134139100001DEST_PATH_IMAGE021
Be respectively the reception noise of base station and user side;
Each deducts self signal section step (1.5) base station and user in the signal of receiving, obtain signal respectively
Figure 686485DEST_PATH_IMAGE022
With
Figure 2010106134139100001DEST_PATH_IMAGE023
Step (1.6) base station and user are separately to handling the back signal With Decipher, decoding matrix is respectively
Figure 780136DEST_PATH_IMAGE026
With
Figure 2010106134139100001DEST_PATH_IMAGE027
, the decode results that obtains separately is
Figure 887769DEST_PATH_IMAGE028
With
2. the network coding method of a kind of two-way relay system based on the precoding of many antennas according to claim 1 is characterized in that: the pre-coding matrix of described step (1.1) lining
Figure 407612DEST_PATH_IMAGE001
With
Figure 956405DEST_PATH_IMAGE003
, the relaying encoder matrix in the step (1.3) , and the decoding matrix in the step (1.6)
Figure 937579DEST_PATH_IMAGE026
With
Figure 870900DEST_PATH_IMAGE027
Choose, the method for choosing is to satisfy under the condition of transmission power limit at base station, user and relaying, seeks matrix
Figure 602095DEST_PATH_IMAGE001
Figure 923355DEST_PATH_IMAGE003
Figure 975549DEST_PATH_IMAGE026
Make that the error rate of system is minimum, promptly minimize Wherein Be the minimized function of needs, The mark of representing matrix, The expression mathematic expectaion, base station transmit signals satisfies Power Limitation , the user transmits and satisfies Power Limitation
Figure 2010106134139100001DEST_PATH_IMAGE035
, the repeat transmitted signal satisfies Power Limitation
Figure 636468DEST_PATH_IMAGE036
, wherein
Figure 2010106134139100001DEST_PATH_IMAGE037
,
Figure 361848DEST_PATH_IMAGE038
With
Figure 2010106134139100001DEST_PATH_IMAGE039
Be respectively the base station, the transmitting power of user and relaying,
Figure 386042DEST_PATH_IMAGE040
,
Figure 2010106134139100001DEST_PATH_IMAGE041
With Be respectively the base station, the maximum transmit power limit of user and relaying; Calculation code matrix step is as follows:
(2.1)
Figure 353047DEST_PATH_IMAGE030
Contain
Figure 2010106134139100001DEST_PATH_IMAGE043
Individual unknown number is designated as vector
Figure 921431DEST_PATH_IMAGE044
, wherein
Figure 2010106134139100001DEST_PATH_IMAGE045
,
Figure 763748DEST_PATH_IMAGE046
With
Figure 2010106134139100001DEST_PATH_IMAGE047
Be respectively the base station, the antenna number of user and relaying,
Figure 708570DEST_PATH_IMAGE048
, wherein
Figure 2010106134139100001DEST_PATH_IMAGE049
Expression launches to embark on journey vector with matrix by row;
(2.2) given initial interior point
Figure 123371DEST_PATH_IMAGE050
, permissible error
Figure 2010106134139100001DEST_PATH_IMAGE051
, initial parameter
Figure 423509DEST_PATH_IMAGE052
, coefficient of reduction
Figure 2010106134139100001DEST_PATH_IMAGE053
, put
Figure 923760DEST_PATH_IMAGE054
(2.3) order , wherein
Figure 672273DEST_PATH_IMAGE056
, with
Figure DEST_PATH_IMAGE057
Be initial point, separate with steepest descent method
Figure 505362DEST_PATH_IMAGE058
, try to achieve minimal point and be
(2.4) if
Figure 681129DEST_PATH_IMAGE060
Then stop to calculate, obtain a little
Figure 668676DEST_PATH_IMAGE059
Otherwise order
Figure DEST_PATH_IMAGE061
, put
Figure 477274DEST_PATH_IMAGE062
, return step (2.3);
Wherein the steepest descent method in the step (2.3) is separated
Figure DEST_PATH_IMAGE063
Concrete steps are as follows:
(2.3.1) put given initial point
, permissible error
Figure DEST_PATH_IMAGE065
, put
Figure 839433DEST_PATH_IMAGE066
(2.3.2) calculate the direction of search
Figure DEST_PATH_IMAGE067
(2.3.3) if , then stop to calculate, with season
Figure DEST_PATH_IMAGE069
Otherwise from
Figure 201330DEST_PATH_IMAGE070
Set out and carry out linear search, ask
Figure DEST_PATH_IMAGE071
Make
(2.3.4) order
Figure DEST_PATH_IMAGE073
, put
Figure 461334DEST_PATH_IMAGE074
, go to step (2.3.2).
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CN102237921A (en) * 2011-08-02 2011-11-09 中国科学技术大学 Physical layer network coding method for bidirectional relay channel of cellular system
CN102421194A (en) * 2011-12-29 2012-04-18 上海交通大学 Uplink and downlink transmission method and device based on two-way relay protocol
CN102857292A (en) * 2012-09-19 2013-01-02 上海交通大学 Multi-user bidirectional relay transmission system and multi-user bidirectional relay transmission method
CN102882655A (en) * 2012-10-29 2013-01-16 北京邮电大学 Base station and user combined transmission method of multi-antenna system based on network code
CN103516484A (en) * 2013-10-09 2014-01-15 中国计量学院 Orthogonality difference space-time network coding method of double-direction relay channel model
CN104981004A (en) * 2015-05-25 2015-10-14 北京理工大学 Transceiver energy efficiency optimization method and device based on multi-user two-way relay system
CN105634579A (en) * 2016-03-04 2016-06-01 北京工业大学 Multi-antenna two-way relay evidence theory receiving method based on decode-and-forward network coding
CN106455034A (en) * 2016-10-21 2017-02-22 浙江万里学院 Simultaneous information and energy transmission method for cellular relay system

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