衰落信道上变速率变功率并行级连格状编码调制

Based on the union bound and code weight distributions,the upper limits of turbo codes and turbo coded modulation performance are derived. Closed-form solutions for the correlated Rayleigh fading channel capacity under maximum ratio combining（MRC）or selection combining（SC）diversity reception are obtained . The performance of adaptive M-ary quadrature amplitude modulation (M-QAM) schemes over correlated Rayleigh channels under MRC or SC diversity reception is investigated. Closed-form solutions of adaptive MQAM performance for Rayleigh fading channel under practical maximum ratio combining（MRC）are obtained.A subband adaptive coded modulation OFDM modem is presented.A new adaptive turbo coded modulation and a new decoding algorithm for fading channels are proposed.

发展变速率变功率并行级连格状编码调制在各种衰落信道上应用和性能分析的新理论。探索并行级连格状编码调制和自适应传输相结合构成变速率变功率并行级连格状编码调制实现衰落信道上频谱效率接近山农极限的高速数字传输，以满足多媒体无线通信等特殊应用的要求。研究变速率变功率并行级连格状编码调制译码算法实现的结构，使该项技术能够实用化。