[1]刘萍,黄学军. 循环前缀不足异步协作系统中继非线性预编码[J].计算机技术与发展,2015,25(03):193-196.
　LIU Ping,HUANG Xue-jun. Relay No-linear Precoder in Asynchronous Cooperative Systems with Insufficient Cyclic Prefix[J].,2015,25(03):193-196.
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 循环前缀不足异步协作系统中继非线性预编码()
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《计算机技术与发展》[ISSN:1006-6977/CN:61-1281/TN]

卷:
25
期数:
2015年03期
页码:
193-196
栏目:
应用开发研究
出版日期:
2015-03-10

文章信息/Info

Title:
 Relay No-linear Precoder in Asynchronous Cooperative Systems with Insufficient Cyclic Prefix
文章编号:
1673-629X（2015)03-0193-04
作者:
 刘萍; 黄学军
 南京邮电大学 通信与信息工程学院
Author(s):
 LIU Ping; HUANG Xue-jun
关键词:
 ; 异步协作OFDM通信系统; 循环前缀; 非线性预编码; 时延
Keywords:
 ; asynchronous cooperative OFDM system; Cyclic Prefix ( CP) ; no-linear precoder; time-delay
分类号:
TP302
文献标志码:
A
摘要:
 在异步协作OFDM通信系统中，正交频分复用( OFDM)技术用于对抗各中继节点到目标节点的时延干扰。各中继节点到目标节点的信道可以被看作多径信道，当循环前缀( CP)的长度大于等于中继时延长度时，可以有效地避免时延引起的符号间干扰( ISI)。实际上协作通信时延多变且与特定情景有关，时延无法被预先知道，同时加入循环前缀降低了码元传输速率，所以有必要研究缩短CP情况下的异步协作OFDM传输方案。但是，当CP长度小于时延长度时，符号间干扰无法被完全消除。为了解决这个问题，文中设计了一种中继节点非线性预编码方案。仿真结果表明，中继节点非线性预编码方案能够很好地降低误码率，提高系统带宽利用率，并且中继节点非线性预编码方案性能优于接收端采用判决反馈均衡的方案。
Abstract:
 In the asynchronous cooperative OFDM system,Orthogonal Frequency Division Multiplexing ( OFDM) technology is applied to combat the time delays from the relay nodes. Channel from relay nodes to the destination node are treated as multipath channel,when the Cyclic Prefix ( CP) is not less than time-delay length,Inter-Symbol Interference ( ISI) caused by the time delay can be effectively a-voided. Actually,the time delays from relay nodes may vary and depend on a particular scenario in a cooperative system,thus time-delay cannot be known in advance,and adding cyclic prefix will reduce code transmission rate. Therefore,it is necessary to research transmis-sion scheme for asynchronous cooperative OFDM system with insufficient CP. However,when the CP length is less than the length of the time-delay,inter-symbol interference cannot be completely eliminated. In order to solve this problem,design a scheme of no-linear pre-coder in relay node. Simulation results show that the scheme of no-linear precoder in relay node can significantly lower bit error rate,im-prove the utilization rate of system bandwidth,and prove the performance of the scheme is better than the scheme of decision feedback e-qualizer in receiver.

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更新日期/Last Update: 2015-05-04