wcdma手机的音频信号从基带到射频的处理流程是什么呀
时间：10-02
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GSM信号流程，Microphone—>采样—>PCM量化—>64Kbit/s数据流—>A律非线形量化（13bit GSM协议规定数据流—>RPE-LTP语音编码—>13Kbit/s 数据流
20ms的数据量此时为260bit
260bit—>CRC code—>267bit—>Convolutional coe—>456bit—>Reordering and Partitioning —>456 bit—>块间交织—>456bit既22.8Kbit/s—>加密突发模式建立—>GMSK调制出IQ信号（调制频率67.708KHZ，一时隙0.577s，传送156.25比特）—>RF混频
20ms的数据量此时为260bit
260bit—>CRC code—>267bit—>Convolutional coe—>456bit—>Reordering and Partitioning —>456 bit—>块间交织—>456bit既22.8Kbit/s—>加密突发模式建立—>GMSK调制出IQ信号（调制频率67.708KHZ，一时隙0.577s，传送156.25比特）—>RF混频
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