一、什么是软判决?软判决是相对于硬判决而言的,与具体的纠错编码或后续算法没有必然关联。软硬判决的区别在于:硬判决以阈值为准绳,武断地对输入信号进行判定;软判决以阈值为参考,对输入信号进行猜测,并声明猜测的可信度。软判决并未判决,仅提供猜测信息和可信度信息,便于后续算法(如Viterbi算法)结合其他信息进一步处理、综合判定。 First, what is a soft decision? Soft decisions are relative to hard decisions, and specific error correction coding or subsequent algorithms are not necessarily related. The difference between hard and soft judgments lies in: the hard decision to the threshold as the criterion, arbitrarily determine the input signal; soft decision threshold value as a reference to guess the input signal, and to declare the credibility of the guess. Soft judgments have not been ruled out, providing only guessing information and credibility information to facilitate subsequent algorithms (such as the Viterbi algorithm) combined with other information for further processing and comprehensive judgments.