摘要
为解决传统差分混沌移位键控(DCSK)通信方案信息速率低和误码率性能差的问题,提出了一种高速差分混沌移位键控(HR-DCSK)通信方案。在发送端,将发送信号的信息帧由2个时隙扩展为3个时隙,并利用希尔伯特变换技术使得一帧发送信号可携带4 bit数据信息;在接收端,采用相关解调法提取数据信息,通过检测相关器输出值的极性恢复数据信息。进一步提出了误码性能更好的多输入多输出(MIMO)HR-DCSK通信方案。利用高斯近似法推导了AWGN和多径Rayleigh衰落信道下MIMO-HR-DCSK方案的比特误码率公式,并与典型的方案进行了仿真比较。仿真结果表明:相同条件下,与MIMO高效差分混沌移位键控(HE-DCSK)方案相比,MIMO-HR-DCSK方案的信息速率提升了约33%,在信噪比为11 dB时,误码性能提升了约73%。
A high rate differential chaos shift keying(HR-DCSK)communication scheme is proposed to improve the problems of low information rate and poor bit error rate(BER)performance of traditional differential chaos shift keying(DCSK)communication scheme.The information frame of the transmitted signal is expanded from two slots to three slots at the transmitter,and the Hilbert transform technology is used to make one frame of the transmitted signal carry 4 bits of data information.The correlation demodulation method is used to extract data information at the receiver,and the data information is recovered by detecting the polarity of the output value of the correlator.Furthermore,a HR-DCSK communication scheme having better bit error rate performance with multiple input and multiple output(MIMO)is proposed.BER expressions of the MIMO-HR-DCSK scheme under AWGN and multi-path Rayleigh fading channels are derived by using Gaussian approximation(GA)method,and the simulation results are compared with that of the typical schemes.The simulation results and comparison with the MIMO high-efficiency differential chaos shift keying(HE-DCSK)scheme under the same channel conditions show that the information rate of the MIMO-HR-DCSK scheme increases by about 33%,and the BER performance increases by about 73% when the signal-to-noise ratio is 11dB.
作者
陈俊
贺利芳
张天骐
CHEN Jun;HE Lifang;ZHANG Tianqi(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2020年第2期137-143,174,共8页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(61771085,61671095)
重庆市教育委员会科研基金资助项目(KJQN201900601)
关键词
高速差分混沌移位键控
多输入多输出
信息速率
误码性能
高斯近似法
high rate differential chaos shift keying
multiple input multiple output
information rate
bit error rate performance
Gaussian approximation method
