一种基于预处理的OFDM低复杂度频域线性均衡算法  

A Low Complexity Frequency-Domain Linear Equalization Algorithm Based on Pre-processing in OFDM System

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作  者:何晨[1] 徐行辉[1] 陈勇[1] 蒋铃鸽[1] 

机构地区:[1]上海交通大学电子工程系,上海200240

出  处:《电子学报》2011年第7期1481-1485,共5页Acta Electronica Sinica

基  金:国家863高技术研究发展计划基金(No.2009AA011505);国家自然科学基金(No.60772100;No.60832009;No.60872017)

摘  要:针对高频段OFDM无线传输系统中严重的载波间干扰(Inter-Carrier Interference,ICI),提出了一种基于预处理的低复杂度频域线性均衡算法.在接收端先对各时刻的信道响应提取时变因子,进行一维时域滤波预处理;再用带状结构去近似提取时变因子后信道的频域矩阵,进行频域线性均衡.仿真结果表明,相对于MMSE算法,该算法以1~2dB的性能代价将系统复杂度降低到10%以下;相对于对信道信息进行部分丢弃的低复杂度算法,高信噪比时该算法可以不增加复杂度而获得5dB以上的性能增益.Considering the serious Inter-Carrier Interference(ICI) in Orthogonal Frequency Division Multiplexing(OFDM) wireless systems with high frequency,a low complexity frequency-domain linear equalization algorithm based on pre-processing is proposed.The new algorithm first extracts a time-variant factor from every channel response.Consequently,one-dimensional filtering pre-processing in time-domain can be achieved at the receiver.As for the time-variant channel after time-variant factor extraction,Banded structure is used to approximate its frequency response matrix,which achieves low complexity frequency-domain linear equalization at the receiver.The analysis and simulation results show that,the proposed algorithm can reduce the complexity to 10% or less at the cost of 1-2dB performance,relative to MMSE algorithm;the proposed algorithm can obtain at least 5dB relative performance gain with the same complexity,compared to the existing low complexity algorithm which discards part channel information.

关 键 词:正交频分复用 载波间干扰 线性时变信道 频域线性均衡 预处理 

分 类 号:TN911.4[电子电信—通信与信息系统]

 

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