【摘要】 构建了一种Turbo乘积码结合分级16QAM调制方式,该码可以在高效率的前提下提供强大的纠错能力,而分级调制可以在同一信道内支持多种业务。同时,给出了收端的分级解调和迭代译码算法,从理论上分析了该方案的纠错性能限,并通过仿真证明其信噪比门限对于实际系统来说是非常容易满足的。更多还原

【Abstract】 A new application of TPC in connection with hierarchical 16QAM modulation is presented. TPC can achieve error-correcting at a high coding rate, while hierarchical modulation supports multi-services within one physical channel. The algorithms of hierarchical demodulation and iterative decoding are introduced and the performance bound of TPC in this application is theoretically analyzed. Simulations show that the SNR threshold of this scheme is very easy to fulfill in a practical digital communication system.更多还原