Influence of Design-SNR on BER Performance under BP Decoder

In order to reduce the decoding latency, the belief propagation (BP) decoder, which is generally used for decoding of the low-density parity-check (LDPC) codes, is effective. In general, the error rate performance of BP decoder is degraded. Therefore, this paper investigates the influence of design signal-to-noise ratio (SNR) on the bit error rate (BER) performance under BP decoder. We first generate the multiple polar codes by setting the multiple design-SNR. The BER performance is used to optimize the polar code for the BP decoder. The simulation results employing N = 1024 and the coding rate of 1/2 show that by setting slightly larger design-SNR compared to the SC decoder, the BER performance is slightly improved.