【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。更多还原

【Abstract】 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.更多还原