改进的GSM话音业务信道调制解调算法  

Improved Modulation and Demodulation Algorithm for GSM Voice Business Channel

作　　者：杨于村[1,2] 冯穗力[1] 崔苗[1] 叶梧[1] 

机构地区：[1]华南理工大学电子与信息学院,广州510641 [2]国家数字交换系统工程技术研究中心,郑州450002

出　　处：《计算机工程》2010年第18期13-14,18,共3页Computer Engineering

基　　金：国家"863"计划基金资助项目(2007AA01Z431)

摘　　要：现有移动通信系统中话音业务的工作模式使移动话音业务信道难以直接传输数据信息,需要设计专用调制解调器。采用数据与波形符号的相互映射实现调制解调是一种可行方案,其中波形码本是设计关键。针对现有算法仿真周期长、收敛速度慢的缺点,对GSM增强型全速率话音业务信道进行建模分析,设计波形符号,并对交叉策略进行改进。仿真结果表明,改进算法的误码性能得到改善。It is difficult for data transmission over mobile voice business channel because of the working mode of mobile voice service in existing mobile communication system. It is necessary to design a special modem. Mapping from data to waveforms and from waveforms to data are good solutions to modulation and demodulation, and the key problem consists in the designer of waveform codebook. Some disadvantages of this method such as long stimulation epoch and slow convergence speed confined its application. Aiming at this problem, modeling analysis for GSM EFR voice business channel is done. Waveform code is designed and crossover scheme is improved. Stimulation results show that the improved algorithm has better error code performance.

关 键 词：GSM 系统 增强型全速率声码器 信道建模 系统辨识 遗传算法 调制解调器 

分 类 号：TN929.5[电子电信—通信与信息系统]