CDMA业务信道卷积解码实现，根据上下行信道区分生成不同码率的卷积码序列，original_sequence是原始输入序列，channel_select是信道选择参数，其中下行码率为1/2，上行信道为1/3 -CDMA business channel decoder Convolutional achieve, according to the distinction between upper and lower line to generate a different channel b