多径时变OFDM系统中消除ICI的新方法

Novel Method of Canceling Inter-Carrier Interference in Multi-Path Time Variant OFDM System

针对无线正交频分复用(OFDM)系统存在载波间干扰(ICI)的问题,提出了一种可用于WLAN和WMAN系统的并行干扰消除(PIC)均衡方法.用该方法估计出前导序列所在符号的信道时域冲激响应,在假设信道冲激响应为线性变化的基础上,使用预滤波器和ICI干扰消除滤波器来消除ICI干扰.仿真结果表明,通过预滤波器的初始判决可以减少噪声加强,能很好地提高抗载波间干扰性能.

Considering the inter-carrier interference （ICI） when the variety of channel is comparatively large, a novel paraller interference cancellation （PIC） equalization method is proposed that can be applied to the time variant WLAN and WMAN systems. The time impulse response of the channel is estimated using the preamble sequence. By assuming the channel to be linearly variant, the pre-filter and ICI cancellation filter is used at the same time to cancel the ICI, the initial decision of the pre-filter can reduce the enhancement of the noise attaining better performance.