PAPR reduction of GFDM system using Parallel concatenation of LDPC codes

Abstract

In this paper, we propose a peak to average power ratio (PAPR) reduction scheme for generalised frequency-division multiplexing (GFDM) systems based on parallel concatenation of low-density parity-check codes (PC-LDPC) codes. The proposed scheme maps the PC-LDPC codewords onto subcarriers to construct a symbol of channel coded GFDM. Then, these sub symbols are combined with subcarriers to form symbols, and these symbols are applied to the PAPR expression of the GFDM system for calculation. The BER value is higher at 10dB for the RRC filter-based GFDM system than the RC filter. The RC filter configuration has less BER at 10dB in 0.2 roll-off factor value with 100 iterations and 200 iterations in soft decision algorithm. When the value of Complementary Cumulative Distribution Function (CCDF) =0.001, the PC-LDPC GFDM system reduces the PAPR by 4 to 4.5 dB compared to the uncoded GFDM signal. The coding gain of 0.5dB is observed in Raised cosine pulse shaping filter with PC-LDPC codes.