时变信道下OFDM系统中基于载频间干扰抑制的迭代检测算法

为了有效地抑制OFDM系统载频间干扰（ICI），提出一种并行干扰消除的迭代检测算法。基于检测信号的信干噪比最大化的准则，通过对接收信号进行判决、重构、干扰抵消处理，建立了ICI抑制的迭代检测算法，给出了信号检测流程。通过对时变信道的分析，研究了时变信道中归一化频偏对系统陛能的影响，给出了性能仿真结果。仿真结果表明所建议的算法可有效地利用时变信道的时间分集特性来提高系统性能，计算复杂度从O（N^3）降低到O（N）。

Intercarrier interference cancellation based on iterative detection algorithm for OFDM systems over time-varying channels

In order to effectically cancel the intercarrier interference(ICI) in the OFDM(orthogonal frequency-division multiplexing) systems,a novel iterative detection algorithm was proposed based on parallel interference cancellation.With the principle of maximize the minimum signal-to-interference and noise power ratio,the received signal was proc-essed by decision,reconstruction and ICI cancellation,iterative algorithm based on ICI cancellation was set up,the flow chart on signal detection was given.On the basis of analysis on time-varying channel,the influence of the normalized Doppler frequency offset on the system performance was investigated.Computer simulation results were presented.Simulation results show that the proposed scheme can improve the system performance significantly by using of the time diversity of time varying channel.The computational complexity can be reduced form O(N 3) toO(N).