We combine the Turbo codes with differential frequency hopping (DFH) technique and propose a new technique called Turbo-DFH coding. The structures of Turbo-DFH encoder and decoder are given. Taking aim at characterist...We combine the Turbo codes with differential frequency hopping (DFH) technique and propose a new technique called Turbo-DFH coding. The structures of Turbo-DFH encoder and decoder are given. Taking aim at characteristic of Turbo-DFH system, the modified Log-MAP algorithm is presented and used for iterative decoding of Turbo-DFH decoder. Simulation results show that because the ideas of random coding and iterative decoding are used, the bit error rate (BER) performance of the Turbo-DFH system is better than that of the conventional DFH system.展开更多
设计了一种基于回归移位寄存器的差分跳频(Differential Frequency Hopping,DFH)码,定义了DFH码的路径重量分布和距离谱,给出了快速计算方法;采用两种不同方法推导了维特比检测算法的误比特率上界,通过计算机仿真对理论推导结果进行了验...设计了一种基于回归移位寄存器的差分跳频(Differential Frequency Hopping,DFH)码,定义了DFH码的路径重量分布和距离谱,给出了快速计算方法;采用两种不同方法推导了维特比检测算法的误比特率上界,通过计算机仿真对理论推导结果进行了验证,在频率集频点个数为8,误比特率为10^(-3)时,理论分析给出的性能估计已经非常精确.对DFH码距离谱特性的分析表明,自由距尽可能大,距离谱尽可能小的是好码.展开更多
文摘We combine the Turbo codes with differential frequency hopping (DFH) technique and propose a new technique called Turbo-DFH coding. The structures of Turbo-DFH encoder and decoder are given. Taking aim at characteristic of Turbo-DFH system, the modified Log-MAP algorithm is presented and used for iterative decoding of Turbo-DFH decoder. Simulation results show that because the ideas of random coding and iterative decoding are used, the bit error rate (BER) performance of the Turbo-DFH system is better than that of the conventional DFH system.
文摘设计了一种基于回归移位寄存器的差分跳频(Differential Frequency Hopping,DFH)码,定义了DFH码的路径重量分布和距离谱,给出了快速计算方法;采用两种不同方法推导了维特比检测算法的误比特率上界,通过计算机仿真对理论推导结果进行了验证,在频率集频点个数为8,误比特率为10^(-3)时,理论分析给出的性能估计已经非常精确.对DFH码距离谱特性的分析表明,自由距尽可能大,距离谱尽可能小的是好码.