摘要
针对相关延迟键控(CDSK)混沌通信方案存在的缺点,提出了一种改进的混沌键控调制方案——分段移位相关延迟键控(SSCDSK)。作为一种多进制调制方案,SSCDSK将延迟信号等分成M个信号段,根据传送的M进制数字码元,将M个信号段循环右移n(0≤n<M)段,并逐位加到原来的混沌信号中构成输出信号。系统仿真表明,在相同的误码率条件下,二进制SSCDSK的信噪比要求比相关延迟键控小3 dB,在混沌信号长度相同的条件下,M进制(M=4,8,16,…)SSCDSK的信息传输速率比相关延迟键控提高log2M倍。
To overcome the disadvantage of correlation delay shift keying （CDSK） based chaotic communication scheme, an improved chaotic communication method is proposed using chaosSegment Shift Correlation Delay Shift Keying （SSCDSK）. As a multilevel modulation scheme, the delayed signal of SSCDSK is divided into M parts followed by shifting n segments out of M segments rightward circularly （ 0 〈 n 〈 M） according to the transmitted Mnary digital code and added to the original chaotic signal bit by bit to form the output signal. The system simulation has shown that the noisesignal ratio requirement of binary SSCDSK is nearly 3 dB less than that of CDSK under the condition of the same BER, and the information transmit rate of Mnary SSCSK （M =4,8,16,…）is log2M times higher than that of CDSK under the condition of the same length of chaotic signal.
出处
《南京邮电大学学报（自然科学版）》
北大核心
2012年第1期71-74,共4页
Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition
基金
国家自然科学基金(60874091)
江苏省"六大人才高峰"高层次人才项目(SJ209006)
江苏省自然科学基金(BK2010526)
高等学校博士点基金(20103223110003)资助项目
