Simplified soft-decision demapping algorithm for DVB-S2

This paper presents a simplified soft-decision demapping algorithm for digital video broadcasting via satellite, second generation (DVB-S2). To achieve a good bit error rate (BER) performance of a low density parity check (LDPC) code decoder, the received signal should be soft-decided rather than hard-decided. However, the soft-decision demapper requires high hardware complexity to support higher-order modulation modes. The proposed soft-decision demapping algorithm can reduce computation complexity by eliminating a square operation. In addition, simulation results show that the proposed algorithm has negligible performance degradation compared with the conventional algorithms.