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多普勒频移和接收载波频差使OFDM系统中各个子载波的正交性得到破坏,产生载波间干扰(IC I)。本文分析了分组衰落信道下OFDM系统各个子载波的信干比(SIR),得出载波间干扰主要集中在相邻的几个子载波上,由此提出了一种估计部分干扰系数来线性均衡OFDM符号中子信号的方法,从而改善接收信号的信干比,提高系统性能。仿真结果表明,使用相邻2个和4个子载波的干扰系数时,接收信号的信干比增益为6dB和10dB,较有效地克服了OFDM系统中载波间干扰。
The Doppler frequency shift and the received carrier frequency difference destroy the orthogonality of each subcarrier in the OFDM system, resulting in intercarrier interference (IC I). In this paper, the signal-to-interference ratio (SIR) of each sub-carrier in OFDM system under packet fading channel is analyzed. It is found that the inter-carrier interference mainly concentrates on several adjacent subcarriers. Therefore, an estimate of partial interference coefficient Symbol neutron signal method to improve the signal-to-interference ratio of the received signal to improve system performance. The simulation results show that the signal to interference gain of the received signal is 6dB and 10dB when the interference coefficients of two adjacent sub-carriers and four sub-carriers are used, which can effectively overcome the inter-carrier interference in the OFDM system.