【摘要】 为了增强高速多媒体无线通信系统在衰落环境中的传输效率,提出了一种基于最大比合并的Turbo乘积码自适应编码调制的通信方法;通过采用信道补偿最佳速率自适应策略,研究了优化的模式切换门限;分析了在瑞利信道环境中自适应传输的系统容量性能.研究表明:所设计的自适应系统具有较强的抗衰落能力;随着分集阶数的增加,其频谱利用率将可以逼近高斯信道香农容量限.更多还原

【Abstract】 In order to improve the transmission efficiency of high speed multi-media wireless communication systems in fading channels,an adaptive turbo product coded modulation communication scheme based on maximum ratio combining is proposed.By using channel compensated optimal rate adaptive strategy,the threshold of adaptive scheme is studied.In flat Rayleigh channels,the system capacity is investigated.Simulation results show that the proposed adaptive system has the robust performance in fading channels.In addition,with the increment of diversity order,the system can achieve the Gaussian channel Shannon’s capacity limit.更多还原