为了在数字芯片上实现TURBO码译码时，降低硬件实现代价，提高运算速度，针对LOGMAP算法，研究了turbo码的译码过程中接收信号、路径度量值，对数似然比的量化方法，并分析了量化方法对译码性能的影响。-In order to achieve in the digital TURBO decoding chip, the lower hardware costs, improve processing speed, for LOGMAP algorithm to study the process of turbo decoding the received signal, the path metric, likelihood ratio of the number of quantitative methods quantitative methods and analysis of the decoding performance.