A Novel Log-BP Decoding Algorithm for LDPC Codes

In this paper, we present a simplification of log-BP algorithm which is able to reduce iterative times of decoding algorithm and save the hardware resource of decoder for LDPC codes. This simplification designs an improved layered-iterative decoding method without reducing the decoding performance, of which speed the updating of check nodes and variable nodes. Simulation results show that the improved layered-iterative log-BP algorithm with six-time iteration exhibits similar decoding performance to the traditional log-BP algorithm with ten-time iteration. When the improved log-BP and traditional log-BP both are simulated in ten-time iteration, the SNR of improved layer-iterative method decreases about 0.25 dB than that of traditional log-BP in the BER of 1e-2.