国家重点实验室 核心思想 o Channel Polarization >Create extreme channels:Either noiseless or useless. o Channel coding problem trivial for these two types of channels >Perfect channels:C(W)=1,the output Y determines the input X Useless channels:C(W)=0,the output Y is independent of the input X o Channel polarization is a technique to convert any binary-input channel into a mixture of binary-input extreme channels 。极化方法 >信道合并与分裂（由编译码共同完成） 4核心思想 Channel Polarization Create extreme channels: Either noiseless or useless. Channel coding problem trivial for these two types of channels  Perfect channels: C(W)=1, the output Y determines the input X  Useless channels: C(W)=0, the output Y is independent of the input X Channel polarization is a technique to convert any binary-input channel into a mixture of binary-input extreme channels 极化方法 信道合并与分裂（由编译码共同完成） 4