一种新的TDCS基函数生成方法及性能分析  

A New Method of Generating TDCS′s Basis Function and the Analysis of Its Performance

作　　者：王杰[1] 毛玉泉[1] 张衡阳[1] 袁天[1] 郭尧[1] 

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《空军工程大学学报（自然科学版）》2014年第1期67-71,共5页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61202490);陕西省自然科学基金资助项目(2010JQ8010)

摘　　要：针对变换域通信系统基函数生成过程中硬判决门限难以精确设置且判决复杂度高的问题,提出了一种功率谱翻转的基函数生成方法。该方法在对电磁环境采样估计的基础上,利用环境谱翻转来构造基函数幅度谱,省去了传统门限值设置和判决的步骤,从而大大降低了通信系统的运算复杂度;另外,由于没有完全舍弃被干扰的频段,与传统的"0"、"1"硬判决相比,该方法生成的基函数频率组成更加丰富而具有更好的相关特性。仿真结果表明:功率反转的基函数生成方法可以降低系统的运算复杂度,同时提高基函数的相关性能,为TDCS的深入研究提供了新的思路。Aimed at the problem that the decision threshold is difficult to precisely set and the complexity of hard decision is high,a new method of power spectrum flip to generate basis function is proposed based on the sampling and estimates of electromagnetic environmental and the environmental spectrum flip is used to construct basis function＇s amplitude spectrum.In this way,lots of the threshold setting and decision steps are eliminated,thus greatly reducing the computational complexity in the communication system.Further-more,compared with the traditional ‘0’and ‘1 ’hard decision method,the new method can be used to generate the basis function with more frequency components and a better correlation performance because the jammed band is not discarded completely.Simulation results show that the new method of generating basis function in power spectrum flip can reduce the computational complexity of the communication sys-tem and simultaneously improve the correlation performance of the basis function,which provides a new way of thinking for the in-depth study of TDCS.

关 键 词：变换域通信系统 基函数 功率谱翻转 抗干扰 

分 类 号：TN92[电子电信—通信与信息系统]