基于QC-LDPC码联合分层译码混合转发协作系统

Hybrid-and-forward cooperative system based on joint layered decoding of QC-LDPC codes

为了提高中继协作系统的整体性能,设计了基于QC-LDPC(Quasi-Cycle Low-Density Parity-Check)码联合分层译码的混合转发协作系统,给出了用于源节点和中继节点编码的QC-LDPC系统码的构造方法,并提出了适用于该协作系统的联合分层译码新算法.根据传统译码转发和编码协作的特点,采用了中继混合转发协作策略,无论中继是否译码成功,中继节点都发送一定形式的冗余信息给目的节点,从而提高协作系统的编码增益和分集增益.仿真结果表明:所提出的混合转发协作系统可以充分发挥中继的分集和编码优势;与非协作系统相比,可以显著提高中继协作系统译码性能.

A hybrid-and-forward cooperative system based on the joint layered decoding of quasi-cycle low-density parity-check（ QC-LDPC） codes was designed to improve the overall performance of the relay cooperative system. The construction method of the QC-LDPC systematic codes used between source node and relay node was presented and a new joint layered decoding algorithm for the cooperative system was proposed.According to the characteristics of traditional decode-and-forward and coded cooperation,a relay hybrid-andforward cooperative strategy was adopted. Regardless of the decoding results of the relay,the relay node sent some redundant information to the destination node,so as to improve the coding gain and diversity gain of the cooperative system. Simulation results show that the designed hybrid-and-forward cooperative system can sufficiently play the advantages of diversity and coding brought by relay. Compared to non-cooperative system,the proposed hybrid-and-forward cooperative system can improve the decoding performance of the relay cooperative system.