一种适用于快衰落信道的ICI抑制方案  

An ICI Mitigation Method in Fast Fading Channel

作　　者：郦荣 陈建民[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2010年第2期22-24,31,共4页Radio Engineering

摘　　要：针对高速移动环境下多普勒频偏造成信道的快衰落和正交频分复用(OFDM)系统中子载波间干扰(ICI)的问题,提出了一种适合快衰落环境的OFDM系统子载波间干扰抑制算法。此算法用线性变化模型来近似一个OFDM符号周期内的信道冲激响应,并以此为基础采用迭代MMSE均衡方法抑制载波间干扰。分析和仿真结果表明,此方法能有效地保证载波间的正交性,从而改善了OFDM系统的误码率(BER)性能。Doppler frequency offset in rapid mobile environment results in both the fast fading and inter-carrier interference (ICI) in orthogonal frequency division multiplexing (OFDM) systems.In order to combat the impact of ICI on OFDM systems in fast fading channels,an ICI mitigation algorithm is proposed in this paper.The algorithm approximates the channel response in one OFDM symbol to a linear model,and then uses frequency domain iteration to mitigate ICI of OFDM symbols.The analysis and simulation results demonstrate the ICI mitigation method can keep the orthogonality between subcarriers effectively and improve the performance of bit error rate (BER) of OFDM system.

关 键 词：OFDM 载波间干扰(ICI) 信道估计 均衡 

分 类 号：TN919.3[电子电信—通信与信息系统]