Analysis of Structure and Performance of VSPC-LDPC Serial Concatenated Codes

A serial concatenated coding method is presented based on low-density parity-check (LDPC) codes and vertical single-parity-check (VSPC) product codes. By applying the decoded result of LDPC codes instead of the horizontal checks of conventional product codes, the performance of the component SPC product codes can be improved with the reduced complexity. The performance of the new concatenated codes is analyzed. Simulation results show that the proposed concatenated codes significantly outperform LDPC codes alone on AWGN channels and Raleigh fading channels, and the additional decoding complexity is very low. Moreover, the error floors of LDPC codes can be impaired effectively.