基于改进Viterbi算法的无线城域网均衡器

T. Majumder, R. R. Raja Kumar
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引用次数: 0

摘要

多径信道均衡的最佳方法是利用Viterbi算法进行最大似然序列估计(MLSE)。然而,该算法具有指数复杂度,使得它不适合在无线城域网场景中典型的具有大延迟扩展的信道中使用。在这里,我们提出了一种替代基本的维特比解码算法,该算法考虑了信道的性质。在模拟中使用的通道类型是基于斯坦福大学临时(SUI)模型。改进的Viterbi算法包括使用维纳滤波器估计信道响应并使用分接延迟来固定要使用的栅格状态,实际修改的Viterbi解码器和决策反馈元件。整个方案符合各种设计标准,并取得了较好的效果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A modified Viterbi algorithm based equaliser for wireless metropolitan area networks
The optimum method of equalisation for channels with multi-path propagation is maximum likelihood sequence estimation (MLSE) using Viterbi algorithm. This algorithm, however, has exponential complexity that makes it unsuitable for use in channels with large delay spreads as is typical in wireless MAN scenarios. Here, we propose an alternative to the basic Viterbi decoding algorithm that takes into account the nature of the channel. The type of channel used in simulations is based on the Stanford University Interim (SUI) model. The modified Viterbi algorithm constitutes estimating the channel response using a Wiener filter and using the tap delays to fix the trellis states to be used, the actual modified Viterbi decoder and a decision feedback element. The entire scheme matches various design criteria and produces reasonably good results.
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