An efficient anti-jamming piecewise coding in cognitive OFDM

An efficient anti-jamming piecewise coding based on cognitive OFDM modulation in cognitive radio network (CRN) is proposed in this paper. The optimal design methods of building piecewise code with low redundancy are presented. In cognitive OFDM, anti-jamming piecewise coding could recover the lost packets in parallel interference channels by implementing different number of parity check blocks, thus it could recover the lost packets and protect secondary users (SUs) from the interference by primary users (PUs). Frame error rate (FER) and throughput performance of SU employing anti-jamming piecewise coding are analyzed respectively. Performance comparison of piecewise coding and another anti-jamming rateless coding are presented simultaneously. Simulation results proved that, anti-jamming piecewise coding provides better FER performance by non-uniform sub-channel selection, and it could achieve better throughput performance with designed smaller overhead in low jamming rate situation.