16QAM解调算法及其在HSDPA中的应用  

Demodulation Algorithm for 16QAM And it's application in HSDPA

作　　者：常萌[1] 申敏[1] 

机构地区：[1]重庆邮电学院通信学院,重庆400065

出　　处：《信息通信》2006年第2期53-56,59,共5页Information & Communications

基　　金：中华人民共和国科学技术部863计划引导项目项目编号:2004AA001390

摘　　要：对16QAM解调软信息输出(LLR)理论计算方法进行分析,推导出其简化解调算法。将两者在性能和计算复杂度方面进行了分析比较,并分别在高斯白噪声信道和瑞利衰落信道环境下进行仿真。结果表明,简化算法的性能只比理论计算方法的性能有少许降低,即保持相同误码率的性能下前者所需信噪比只比后者提高约0．1dB,但是计算复杂度却大大降低。同时也阐述了将其应用于第三代移动通信系统增强型技术HSDPA中星座图重排技术的实现方法。本文给出的计算方法也可推广到其它的通信系统中。In this paper, the theoretical algorithm of bit-level soft-output demodulation for 16QAM is analyzed, and a simplified algorithm to calculate LLR is developed. The performance and computational complexity are compared between them. The simulation results for them under theAWGN channel and Rayleigh fading channel displays that the simplified algorithm has nearly no performance loss to the theoretical one, The SNR needed in the simplified algorithmic is approximately 0.1dB greater than the theoretical one under the same performance. But it will remarkably reduce the computational complexity. At the same time, the method for it＇s employing to signal constellation rearrangement in HSDPAis developed, It could be applied to other communication systems.

关 键 词：16QAM LLR HSDPA 星座图重 

分 类 号：TN929.533[电子电信—通信与信息系统]