一种快速时变信道下的单载波频域均衡算法

A Frequency Domain Equalization Algorithm for Single-Carrier Systems over Fast Time-Varying Channels

借鉴多载波系统中的迭代和判决反馈干扰消除算法,提出一种适用于快速时变信道的单载波频域均衡算法.通过线性均衡得到信号的初始估计,从接收信号中迭代消除由于快速衰落所引起的符号间干扰,基于最小均方误差准则进行频域均衡,并将信道时变所造成的符号间干扰视为等效噪声.仿真结果表明,所提出的算法能够有效降低快速时变信道下的误码平层.

An iterative decision feedback frequency domain equalization algorithm for single-carrier systems over fast time-varying channels was presented,referring to the inter-carrier interference（ICI） cancellation schemes of multi-carrier systems.The interference induced by fast fading was iteratively cancelled using a tentative estimation of the received signal obtained from linear equalization.The inter-symbol interference induced by fast fading was treated as equivalent noise power during frequency domain equalization based on minimum mean-squared error（MMSE） criteria.Simulations show that the proposed method using iteration and decision-feedback can effectively lower the error floor in fast fading environment.