基于稀疏多径信道的均衡技术分析

Analysis on Equalization Based on Sparse Multipath Channel

为了解决宽带通信稀疏多径信道下均衡器结构复杂和收敛速度慢的问题,介绍了稀疏多径信道和基于伪随机序列的多径搜索。针对稀疏多径信道的特点,对判决反馈均衡器进行改进,提出了一种基于正交匹配追踪信道估计的完全判决反馈均衡器。利用正交匹配追踪估计结果在前馈均衡器前消除已判决码元对当前判决码元的码间串扰,降低了均衡器的复杂度,提高了收敛速度。通过仿真分析表明完全判决反馈均衡器能取得良好的性能。

In order to solve the problem that the, structure is too complexity and the convergent time is too long under sparse multipath channel in wideband communication, this paper intr3duces the sparse muhipath channel and muhipath searching technique based on PN sequence. Exploiting the sparseness of the channel, the decision feedback equalizer is improved. Based on that, the paper proposes the complete feedback equalizer using orthogonal matching pursuit channel estimate. The postcursor ISI is eliminated before the feedforward filtering using the estimated multipath parameters, which reduces the complexity and speeds up the convergence. Simulation results are presented to demonstrate the feasibility of the proposed techniques.