MIMO-OFDM系统的GFDFR空频编码分组方法及其检测
doi: 10.3724/SP.J.1146.2007.00201
A Subcarrier Grouping Approach and Detection for MIMO-OFDM Systems with GFDFR Space-Frequency Coding
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摘要: 该文提出了一种可应用于具有保护虚载波和直流虚载波的多输入多输出正交频分复用(MIMO-OFDM)系统的分组满分集满速率(GFDFR)空频编码分组方法，并给出了适合GFDFR空时(频)编码系统的混合概率数据关联与球形译码(PDA-SD)硬判检测算法和基于硬判检测结果的邻域搜索软输出检测算法。在此基础上提出了一种基于硬判检测结果的一维邻域搜索软输出检测算法，有效降低了运算复杂度。仿真结果表明，提出的GFDFR空频编码分组方法对保护虚载波数目不敏感，具有较好的鲁棒性和实用价值，相应的硬、软判检测算法均获得了较好的性能。Abstract: In this paper, a subcarrier grouping approach for Group-wise Full-Diversity Full-Rate (GFDFR) coded MIMO-OFDM systems with virtual and DC subcarriers is proposed. A PDA-SD hard detection algorithm and a neighbor searching soft detection algorithm, which all have low complexities, are presented to decode the GFDFR code. A one-dimensional neighbor searching detection algorithm, which is based on the hard detection algorithm and can effectively reduces the detection complexity, is proposed. Simulation results show that the subcarrier grouping approach is robust and insensitive to the numbers of virtual and DC subcarriers and all the detection algorithms have better bit-error rate performance.
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