基于联合迭代算法的多层编码超宽带通信系统

Combined Iterative Algorithm for Multilevel Coded UWB Communications Systems

该文提出一种多层编码的超宽带通信系统,给出接收端脉冲解映射器和译码器之间联合迭代处理算法。三层编码的超宽带系统的误码性能仿真表明:比较未编码系统,误码性能得到明显的改善;AWGN信道下,多级迭代算法和并行迭代算法分别需要3次和4次迭代收敛到最佳性能;而在室内信道环境中,多级迭代算法和并行迭代算法各自需要2次和3次迭代收敛到最佳性能;最佳迭代次数下,两种算法的性能相当,但并行迭代算法的时延约为多级迭代算法时延的1/3。

In this paper, a multilevel coded ultra wideband system with combined iterative pulses demapping and decoding algorithm is proposed. The simulation result of three level coded ultra wideband systems show that the bit error performance has been improved prominently compared with uncoded situation. Iterative multistage algorithm and iterative parallel algorithm can achieve optimal performance through three and four iterations respectively in AWGN channel, but in indoor multipath channels, two and three iterations are enough to get the optimal performance respectively. Compared to iterative multistage algorithm, iterative parallel algorithm achieves equivalent performance under optimal iteration and requires only about 1/3 time delay than latter.