摘要
针对变换域通信系统在幅度谱成型采用硬判决门限算法和基于m序列的伪随机相位生成算法两方面存在的不足,提出了一种改进的变换域通信系统(tranform domain communication,TDCS)基函数生成算法。在对电磁环境估计的基础上,翻转功率谱进行免门限幅度谱成型,同时利用"注水定理"功率分配法改变调幅因子,增强了系统的抗干扰能力;使用gold序列代替传统的m序列进行伪随机相位生成,伪随机相位的随机性得到很大的提高,增大了噪声系数NFI,改善了系统的射频隐身性能。仿真结果表明,通过同时改进幅度谱和伪随机相位生成,基函数的性能得到明显的改善,使变换域通信系统具有良好的低截获/低检测特性,同时兼顾抗干扰与射频隐身能力。
Aimed at the defects and insufficiencies of transform domain communication system （ TDCS） in the amplitude spectrum shaping by hard threshold judgment algorithm and adoptingm sequence to generate pseudo random phase, ane＇w algorithm is proposed in this paper to generate the basis function in TDCS. Based on the estimation of electromagnetic envi-ronment ,power spectrum is reversed for exemption threshold amplitude spectrum shaping and changing the amplitude mod-ulation factor by using the aWater injection theorem” energy distribution method at the same time, enhancing the anti-inter-ference ability of the system. Additionally, gold sequence is used to replace traditional m sequence dom phase , where the randomness of pseudorandom phase is greatly improved , thus increasing the improving the performance of radio frequency（ RF） stealth. The simulation results show^ that by modifying amptrum and pseudo random phase , the performance of the basis function can be greatly improved , which enables the TDCS tohave good low probability of interaeption/low probability of detection（LPI/LPD） characteristics, with favorable anti-jamming and RF stealth ability at the same time.
出处
《重庆邮电大学学报（自然科学版）》
CSCD
北大核心
2016年第3期312-318,共7页
Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)
基金
国家自然科学基金(61202490)
航空科学基金项目(2013ZC15008)~~
关键词
n变换域通信系统
免门限判决
GOLD序列
抗干扰
射频隐身
transform domain communication system
avoid threshold judgment
gold sequence
anti-jamming
radio fre-quency stealth
