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Turbo-Coded Modulation of EVRC Speech Encoder with Unequal Error Protection for Fading Channels |
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| Authors: | Ahmed J. Jameel PAN Zhi-wen GAO Xi-qi YOU Xiao-hu |
| Affiliation: | Dept.of Radio Eng., Southeast Univ., Nanjing 210096, China;Dept.of Radio Eng., Southeast Univ., Nanjing 210096, China;Dept.of Radio Eng., Southeast Univ., Nanjing 210096, China;Dept.of Radio Eng., Southeast Univ., Nanjing 210096, China |
| Abstract: | 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. |
| Keywords: | enhanced variable rate codec (EVRC) turbo codes unequal error protection (UEP) quadrature amplitude modulation (QAM) |
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