Turbo-Coded Modulation of EVRC Speech Encoder with Unequal Error Protection for Fading Channels  

作　　者：阿哈麦德 潘志文 高西奇 尤肖虎 

机构地区：[1]Dept. of Radio Eng., Southeast Univ., Nanjing 210096, China

出　　处：《Journal of Shanghai Jiaotong university(Science)》2003年第2期150-156,共7页上海交通大学学报（英文版）

基　　金：National Natural Science Foundation ofChina( No.6972 5 0 0 1)

摘　　要：The Enhanced Variable Rate Codec (EVRC) is a standard for the Speech Service Option 3 for Wideband Spread Spectrum Digital System, which has been employed in both IS-95 cellular systems and ANSI J-STC-008 PCS (Personal Communications Systems). This paper investigated the combination of turbo codes with Unequal Error Protection (UEP) and 16-QAM modulation for EVRC codec of Rate 1 to get power and bandwidth efficient coding scheme. The results show that the UEP system outperforms the Equal Error Protection (EEP) one by 1.45 dB at BER of 10 -5.The Enhanced Variable Rate Codec (EVRC) is a standard for the Speech Service Option 3 for Wideband Spread Spectrum Digital System, which has been employed in both IS-95 cellular systems and ANSI J-STC-008 PCS (Personal Communications Systems). This paper investigated the combination of turbo codes with Unequal Error Protection (UEP) and 16-QAM modulation for EVRC codec of Rate 1 to get power and bandwidth efficient coding scheme. The results show that the UEP system outperforms the Equal Error Protection (EEP) one by 1.45 dB at BER of 10 -5.

关 键 词：enhanced variable rate codec (EVRC) turbo codes unequal error protection (UEP) quadrature amplitude modulation (QAM) 

分 类 号：TN762[电子电信—电路与系统]