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 PDFInfo
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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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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
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
To transmitting
Carry out precoding processing, the user uses pre-coding matrix simultaneously
To transmitting
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
With
, relaying receives aliasing signal
, wherein
Be the channel of base station to relaying,
Be the channel of user to relaying,
Reception noise for the relaying place;
Step (1.3) relaying is to aliasing signal
Use matrix
Carry out forming broadcast singal after the precoding
Step (1.4) is at second time slot, repeat transmitted broadcast singal
, system works then is relayed to the base station and is respectively to user's channel in the time division duplex environment
With
, subscript wherein
The conjugate transpose of representing matrix, base station and user receive that respectively signal is
Each deducts self signal section step (1.5) base station and user in the signal of receiving, obtain signal respectively
With
Step (1.6) base station and user are separately to handling the back signal
With
Decipher, decoding matrix is respectively
With
, the decode results that obtains separately is
With
The pre-coding matrix of described step (1.1) lining
With
, the relaying encoder matrix in the step (1.3)
,And the decoding matrix in the step (1.6)
With
Choose, the method for choosing is to satisfy under the condition of transmission power limit at base station, user and relaying, seeks matrix
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
, the repeat transmitted signal satisfies Power Limitation
, wherein
,
With
Be respectively the base station, the transmitting power of user and relaying,
,
With
Be respectively the base station, the maximum transmit power limit of user and relaying; Calculation code matrix step is as follows:
(2.1)
Contain
Individual unknown number is designated as vector
, wherein
,
With
Be respectively the base station, the antenna number of user and relaying,
, wherein
Expression launches to embark on journey vector with matrix by row;
(2.2) given initial interior point
, permissible error
, initial parameter
, coefficient of reduction
, put
(2.3) order
, wherein
, with
Be initial point, separate with steepest descent method
, try to achieve minimal point and be
(2.3.1) put given initial point
(2.3.3) if
, then stop to calculate, with season
Otherwise from
Set out and carry out linear search, ask
Make
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
,
With
The base station to the channel of relaying is
, the user to the channel of relaying is
, 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
Carry out precoding processing, the user uses pre-coding matrix simultaneously
To transmitting
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
With
, relaying receives aliasing signal
, wherein
Be the channel of base station to relaying,
Be the channel of user to relaying,
Reception noise for the relaying place;
Step (1.3) relaying is to aliasing signal
Use matrix
Carry out forming broadcast singal after the precoding
Step (1.4) is at second time slot, repeat transmitted broadcast singal
, system works then is relayed to the base station and is respectively to user's channel in the time division duplex environment
With
, subscript wherein
The conjugate transpose of representing matrix, base station and user receive that respectively signal is
Each deducts self signal section step (1.5) base station and user in the signal of receiving, obtain signal respectively
With
Step (1.6) base station and user are separately to handling the back signal
With
Decipher, decoding matrix is respectively
With
, the decode results that obtains separately is
With
The pre-coding matrix of step (1.1) lining
With
, the relaying encoder matrix in the step (1.3)
,And the decoding matrix in the step (1.6)
With
Choose.The method of choosing is to satisfy under the condition of transmission power limit at base station, user and relaying, seeks matrix
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
, the user transmits and satisfies Power Limitation
, the repeat transmitted signal satisfies Power Limitation
, wherein
,
With
Be respectively the base station, the transmitting power of user and relaying,
,
With
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
With primary signal
With
The spacing minimum promptly minimizes
, wherein
Be the minimized function of needs,
The mark of representing matrix,
The expression mathematic expectaion, use interior point method to ask the step of encoder matrix as follows:
(2.1)
Contain
Individual unknown number is designated as vector
, wherein
,
With
Be respectively the base station, the antenna number of user and relaying,
,Wherein
Expression launches to embark on journey vector with matrix by row;
(2.2) given initial interior point
, permissible error
, initial parameter
, coefficient of reduction
, put
(2.3) order
, wherein
, with
Be initial point, separate with steepest descent method
, try to achieve minimal point and be
(2.3.1) put given initial point
(2.3.3) if
, then stop to calculate, with season
Otherwise from
Set out and carry out linear search, ask
Make
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
To transmitting
Carry out precoding processing, the user uses pre-coding matrix simultaneously
To transmitting
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
With
, relaying receives aliasing signal
, wherein
Be the channel of base station to relaying,
Be the channel of user to relaying,
Reception noise for the relaying place;
Step (1.3) relaying is to aliasing signal
Use matrix
Carry out forming broadcast singal after the precoding
Step (1.4) is at second time slot, repeat transmitted broadcast singal
, system works then is relayed to the base station and is respectively to user's channel in the time division duplex environment
With
, subscript wherein
The conjugate transpose of representing matrix, base station and user receive that respectively signal is
Each deducts self signal section step (1.5) base station and user in the signal of receiving, obtain signal respectively
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
With
, the relaying encoder matrix in the step (1.3)
, and the decoding matrix in the step (1.6)
With
Choose, the method for choosing is to satisfy under the condition of transmission power limit at base station, user and relaying, seeks matrix
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
, the repeat transmitted signal satisfies Power Limitation
, wherein
,
With
Be respectively the base station, the transmitting power of user and relaying,
,
With
Be respectively the base station, the maximum transmit power limit of user and relaying; Calculation code matrix step is as follows:
(2.1)
Contain
Individual unknown number is designated as vector
, wherein
,
With
Be respectively the base station, the antenna number of user and relaying,
, wherein
Expression launches to embark on journey vector with matrix by row;
(2.2) given initial interior point
, permissible error
, initial parameter
, coefficient of reduction
, put
(2.3) order
, wherein
, with
Be initial point, separate with steepest descent method
, try to achieve minimal point and be
(2.3.1) put given initial point
(2.3.3) if
, then stop to calculate, with season
Otherwise from
Set out and carry out linear search, ask
Make
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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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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 |
CN102237921B (en) * | 2011-08-02 | 2014-05-14 | 中国科学技术大学 | Physical layer network coding method for bidirectional relay channel of cellular system |
CN102421194B (en) * | 2011-12-29 | 2014-07-16 | 上海交通大学 | Uplink and downlink transmission method and device based on two-way relay protocol |
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 |
CN102857292B (en) * | 2012-09-19 | 2015-05-20 | 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 |
CN102882655B (en) * | 2012-10-29 | 2015-06-17 | 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 |
CN103516484B (en) * | 2013-10-09 | 2017-04-12 | 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 |
CN104981004B (en) * | 2015-05-25 | 2018-05-08 | 北京理工大学 | Transceiver efficiency optimization method and device based on multi-user's bidirectional 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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