基于对数似然比的Chase型MIMO-HARQ合并检测方案

摘要

Multiple-input multiple-output (MIMO) systems with Hybrid Automatic Repeat reQuest (HARQ) promises high throughput with high reliability. Some novel sphere decoding MIMO-HARQ receiving algorithms with Chase combining schemes (SLC-Ⅰ SD, SLC-Ⅱ SD, BLC SD) are proposed based on the log-likelihood ratio (LLR). Using a "list of candidate" version of the sphere decoder, a simple method to save the bit LLR in every transmission is provided. With the analyses and the simulations, the suggested algorithms have better tradeoff of performance and complexity and they can be used for MIMO-HARQ systems with either Chase combining or Incremental Redundancy (IR) combining.%MIMO-HARQ系统具有MIMO系统高信息传输率和HARQ系统的高可靠性.将球形译码算法用于MIMO-HARQ,提出了基于对数似然比(LLR)的Chase合并MIMO-HARQ的几种球形译码方案(SLC-Ⅰ SD、SLC-ⅡSD、BLCSD).在各次传输中,采用“候选列表”保存各信号点的LLR.分析和仿真表明,相对ML检测算法,所提方案具有很好的性能与复杂度之间的折中,可应用于Chase合并和增量冗余(IR)合并中.