MPPM软判决方案及其在超宽带通信中的应用  

Soft-decision Decoding of MPPM and Its Application in Ultra Wideband Communications

作　　者：李昌[1] 蔡启博[1] 万东冬[2] 

机构地区：[1]温州大学物理与电子信息学院,浙江温州325007 [2]北京邮电大学电子工程学院,北京100876

出　　处：《重庆大学学报（自然科学版）》2007年第5期62-64,69,共4页Journal of Chongqing University

基　　金：浙江省自然科学基金资助项目(600046)

摘　　要：脉冲位置调制(PPM)是一种非常适用于超宽带通信的调制方式,现有的对于M元脉冲位置调制(MPPM)译码都是通过硬判决进行的。软判决充分利用了接收信号信息,因而能更有效地实现信号解调。理论推导出了脉冲位置调制的软判决实现方法。仿真结果显示了在AWGN信道中,基于该方法的软译码误码性能比传统的硬译码性能有很大的优势,该方案可用于超宽带通信。Pulse Position Modulation is quite suitable for UWB. Existing methods for MPPM decoding are based on harddecision. As the information of the received signal has been deeply used by the soft decode technology, demodulation can be realized more perfectly. The soft decode technology of pulse position modulation was proposed. Formulas for soft-decision computaion have educed. Theoretic analysis and simulation results show that the proposed method achieves excellent performance than the hard decoding method, and that it is fit for UWB.

关 键 词：超宽带 脉冲位置调制 对数似然比 软译码 

分 类 号：TN911.22[电子电信—通信与信息系统]