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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.
In order to improve the overall performance of the relay cooperative system, a hybrid forwarding cooperative system based on QC-LDPC (Joint Discriminating Code) and hierarchical decoding is designed, and a scheme for source and relay nodes And proposes a new joint layered decoding algorithm which is suitable for this collaborative system.According to the characteristics of traditional transcoding and coding cooperation, a relay hybrid forwarding cooperation strategy is adopted, Following the success of decoding, the relay node sends some kind of redundant information to the destination node to improve the coding gain and diversity gain of the cooperative system.The simulation results show that the proposed hybrid-forward cooperative system can give full play to the relay diversity And coding advantages; Compared with non-cooperative system, can significantly improve the performance of relay cooperative system decoding.