一种实用自适应Turbo编码调制的优化设计  

Optimal Design of Pragmatic Adaptive Turbo Coded Modulation

作　　者：左健存[1] 宋文涛[1] 罗汉文[1] 徐友云[1] 

机构地区：[1]上海交通大学电子工程系,上海200030

出　　处：《上海交通大学学报》2004年第5期673-677,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(60072028);国家高技术研究发展计划(863)项目(2001AA121031)

摘　　要：提出一种用于慢衰落信道上的实用自适应Turbo编码调制方案.该自适应方案在所有衰落域中使用相同的、由码率可变Turbo编码器和速率、功率可变多阶正交幅度(MQAM)调制器组成的Turbo编码调制器,具有较低的实现复杂度.给出了满足各种系统约束条件下的优化设计,并通过系统仿真验证其性能.结果表明,同时自适应调整Turbo编码调制器的速率和传输功率可以达到距Shannon容量限仅2.5dB的优异性能.This paper presented a pragmatic adaptive scheme for TuCM over slowly fading channels. The adaptive scheme employs a single turbo coded modulator composed of a variable-rate turbo encoder and a variable-rate variable-power MQAM for all fading regions, which has an acceptable complexity to implement. The optimal adaptive TuCM scheme is determined subject to various system constraints. Simulations were performed to measure the performance of the scheme for different parameters. The results show that adapting both the turbo coded modulator and the transmit power achieves the performance within 2.5 dB of the fading channel capacity.

关 键 词：自适应Turbo编码调制 衰落信道 频谱效率 最优化 

分 类 号：TN929.5[电子电信—通信与信息系统]