CDMA2000移动通信系统语音编码算法研究及仿真  

Research and Simulation of Speech Coding Algorithm of CDMA 2000 Mobile Communication System

作　　者：孙浩海[1] 张雄伟[2] 邹霞[2] 

机构地区：[1]解放军理工大学通信工程学院研究生 2队 [2]解放军理工大学通信工程学院电子信息工程系

出　　处：《军事通信技术》2005年第1期26-31,共6页Journal of Military Communications Technology

摘　　要：全面介绍了3GPP2公布的CDMA2000移动通信系统中的可选择模式语音编码算法(SMV),并着重讨论了SMV算法对语音进行编码和解码过程中的EX-CELP算法、语音分类处理,自适应码本贡献时域去加重和编码速率选择等关键技术。仿真结果表明,它在灵活调整平均编码速率的同时可以提供优良的话音质量,满足第三代移动通信系统对语音编码高质量和变速率的要求,能够使通话服务质量与信道利用率之间达到较为理想的均衡。The Selectable Mode Vocoder(SMV) algorithm has been chosen by 3GPP2 as the standard for CDMA2000. In this paper, the whole speech coding algorithm was introduced, with the emphasis on the key techniques throughout the procedure of speech coding and decoding, such as EX-CELP, temporal deemphasising of LTP contribution, speech classification, rate decision, etc. The result of simulation shows that, SMV can provide excellent speech quality with the flexibility of operating at various ABR(Average Bit Rate), and it is able to resolve the problem of tradeoff between the speech quality and CDMA system capacity in an effective way.

关 键 词：语音编码 可选择模式声码器 扩展码激励线性预测 

分 类 号：TN912.3[电子电信—通信与信息系统]