【文件属性】：
文件名称：信道编码-华为CDMA2000
文件大小：3.95MB
文件格式：PPT
更新时间：2021-04-23 12:05:20
cdma
信道编码
信道编码采用卷积码或者TURBO码。
对于卷积码：
约束长度：移位寄存器数+1。
编码效率：输入bit数 / 输出bit数。
卷积码编码器
Input (bits)
Output (symbols)
CDMA 核心技术
convolution code is an error correcting code. Convolution aims to associate a previous signal with a subsequent one and the association of the previous signal and the subsequent one actually means that this signal is capable of detecting and/or correcting an error. Error correcting or error detecting certainly will increase some redundancy signals, therefore the output bit rate increases to 3 times that at the input terminal of a convolution encoder.