The extrinsic information delivered by every BP iteration is averaged and the averaged LLR values are used as a prior LLR fed back to the input of demodulator for the next iteration.

• 与传统的解调/译码算法不同在于，该算法对每次BP迭代中译码器输出的各编码比特的外附LLR分别求均值后，再将其作为先验信息反馈给软解调器开始下次的迭代解调/译码。