A Modified Belief Propagation Polar Decoder

In this paper, a modified belief propagation (BP) polar decoder is proposed. Unlike the orignal BP polar decoders, a check node is added to each node of the proposed decoder. In the BP decoding, the propagated messages of the nodes are modified by multiplying the messages from the check nodes, so as to enhance the reliability of these propagated messages. Numerical results show that the proposed decoder achieves better performance than that of the original BP decoders, only at cost of some additional multiplications, which indicates its effectiveness.