将置信传播(belief propagation,BP)算法从马尔科夫随机域的角度进行理解， 并通过变量节点和校验界定之间的迭代来实现信息传递，进而提高系统的误码率性能。 -The belief propagation (belief propagation, BP) algorithm is understood from the perspective of Markov random field, and by defining the iteration variable nod