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.
出处
《电子学报》
EI
CAS
CSCD
北大核心
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)
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
OFDM
ICI
Linear Time-Variant（LTV） Channel
Frequency-domain Linear Equalization（FDLE）
Pre-processing
