认知OFDM中的抗干扰分段编码设计

摘要

认知正交频分复用(OFDM)中主用户突发干扰会造成认知用户数据包丢失.为此,提出一种基于认知OFDM的抗干扰分段编码方案.分段编码基于低冗余度的优化设计方法进行构造.该抗干扰分段编码方案可通过对偶校验分组恢复丢失的数据包,在认知用户通信过程中避免主用户突发干扰.实验结果表明,在低干扰率情况下,该方案比无码率编码方案具有更低的帧差错率和更高的吞吐量性能.%Aiming at the problem of cognitive user package lost caused by primary user burst interference in cognitive Orthogonal Frequency Division Multiplexing(OFDM), an efficient anti-jamming piecewise coding scheme based on cognitive OFDM is proposed. The construction of piecewise coding is presented with low redundancy optimization method. Anti-jamming piecewise coding can recover the lost packets by implementing different number of parity check blocks, thus it can protect Secondary Users(SU) from Primary Users(PU) by burst interference avoiding. Simulation results prove that by non-uniform sub-channel selection, anti-jamming piecewise coding with smaller overhead provides better Frame Error Rate(FER) and throughput performance than anti-jamming rateless coding in low jamming rate region.