计算机技术与发展Issue(3)：193-196,4.DOI:10.3969/j.issn.1673-629X.2015.03.044
循环前缀不足异步协作系统中继非线性预编码
Relay No-linear Precoder in Asynchronous Cooperative Systems with Insufficient Cyclic Prefix
摘要
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.关键词
异步协作OFDM通信系统/循环前缀/非线性预编码/时延Key words
asynchronous cooperative OFDM system/Cyclic Prefix ( CP)/no-linear precoder/time-delay分类
信息技术与安全科学引用本文复制引用
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,(3):193-196,4.基金项目
国家“973”重点基础研究发展计划项目(2013CB329005) （2013CB329005）
国家科技重大专项(2012ZX03001008-003,2011ZX03005-004-03) （2012ZX03001008-003,2011ZX03005-004-03）
江苏省自然科学基金重点专项(江苏“973”)(BK2011027) （江苏“973”）
