Low complexity soft-decision demapper for DVB-S2 using phase selection method
Jea Hack Lee, Myung Hoon Sunwoo, Pan Soo Kim, Dae‐Ig Chang · 2011
This paper presents a simplified soft-decision demapping algorithm using the phase selection method 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) decoder and support higher-order modulation modes, the soft-decision demapper should require high hardware complexity. The proposed soft-decision demapping algorithm can reduce computation complexity by eliminating square operations. In addition, simulation results show that the proposed algorithm has negligible performance degradation compared with the conventional algorithms. Moreover, the proposed soft-decision demapper has been verified using the Virtex IV-LX 200 FPGA board. Comparing with the direct implementation, the proposed demapper can reduce about 81% hardware resources.