无CP的OFDM系统中的检测算法的实现及性能分析
首发时间:2013-05-22
摘要:由于在OFDM中加入了循环前缀(CP),从而消除了由于多径时延产生的符号间干扰(ISI)。但是循环前缀的加入同时也带来了数据速率和信号功率的损失。于是,针对CP不足或者无CP的OFDM系统,提出了残留ISI删除(Residual ISI Cancellation)算法,可以消除由于循环前缀(CP)长度不足或者无CP而产生的符号间干扰(ISI)。残留ISI删除算法主要包括尾删除和循环前缀重构两部分,尾删除操作用来消除接收信号的残留符号间干扰(ISI),循环重构则用来避免信道间干扰(ICI)。本文对该算法在不同信道条件和不同迭代次数的情况下进行了算法的性能分析,该技术将被证明是一项具有合理复杂度并且极为有效的对抗残留符号间干扰的技术。
关键词: 通信与信息系统 符号间干扰(ICI) 信道间干扰(ISI) 正交频分复用(OFDM)系统 残留ISI删除算法
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The Realization and Performance Analysis of Detection Algorithm for OFDM System with no CP
Abstract:Due to the addition of cyclic prefix to the OFDM symbol ,we can mitigate the residual ISI.However,the addition of cyclic prefix also introduces the loss of data rate and signal power .Thus, we propose RISIC (Residual ISI Cancellation) algorithm for the OFDM system which is lack of CP or without CP,RISIC algorithm is an iterative algorithm which can eliminate the ISI introduced by lack of CP or no CP .RISIC algorithm includes two procedures , tail cancellation and cyclic reconstruction,the first is to remove the residual ISI from the received signal,and the second is to use reconstruction to restore cyclicity and avoid ICI.This article provides performance analysis of the algorithm in different channel evironment and different iterations of the algorithm. The RISIC technique will be shown to be highly effective in combating residual ISI with reasonable complexity.
Keywords: Communication and information system Interchannel interference(ICI) Intersymbol interference(ISI) Orthogonal frequency division multiplexing(OFDM) system Residual ISI Cancellation algorithm
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