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Bit-Interleaved Coded OFDM With Signal Space Diversity: Subcarrier Grouping and Rotation Matrix Design

机译:具有信号空间分集的比特交织编码OFDM:子载波分组和旋转矩阵设计

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This paper investigates the application of bit-interleaved coded modulation and iterative decoding (BICM-ID) in orthogonal-frequency-division-multiplexing (OFDM) systems with signal space diversity (SSD) over frequency-selective Rayleigh-fading channels. Correlated fading over subcarriers is assumed. At first, a tight bound on the asymptotic error performance for the general case of precoding over all N subcarriers is derived and used to establish the best achievable asymptotic performance by SSD. It is then shown that precoding over subgroups of at least L subcarriers per group, where L is the number of channel taps, is sufficient to obtain this best asymptotic error performance, while significantly reducing the receiver complexity. The optimal joint subcarrier grouping and rotation matrix design is subsequently determined by solving the Vandermonde linear system. Illustrative examples show a good agreement between various analytical and simulation results
机译:本文研究了比特交织编码调制和迭代解码(BICM-ID)在频率选择瑞利衰落信道上具有信号空间分集(SSD)的正交频分复用(OFDM)系统中的应用。假定子载波上的相关衰落。首先,推导了在所有N个子载波上进行预编码的一般情况下渐近错误性能的严格界限,并将其用于建立SSD可以实现的最佳渐近性能。然后表明,在每组至少L个子载波的子组上进行预编码(其中L是信道抽头的数量)足以获得最佳的渐近差错性能,同时显着降低了接收机的复杂度。随后,通过求解范德蒙德线性系统,确定最佳的联合子载波分组和旋转矩阵设计。说明性示例显示了各种分析结果和模拟结果之间的良好一致性

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