双选信道下混合载波调制的均衡及优化  

Equalization and Optimization of Hybrid Carrier Modulation Under Doubly-Selective Channel

作　　者：翟东 达新宇[1] 梁源[1] ZHAI Dong;DA Xin-yu;LIANG Yuan(College of Information and Navigation,Air Force Engineering University,Xi'an 710077,China)

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：《测控技术》2018年第4期68-71,77,共5页Measurement & Control Technology

基　　金：国家自然科学基金资助项目(61571460)

摘　　要：针对双选信道条件下基于加权分数阶傅里叶变换(Weighted-Type Fractional Fourier Transform,WFRFT)的混合载波调制(Hybrid Carrier Modulation,HCM)系统的干扰抑制问题,提出采用优化方法,使混合载波调制系统的性能达到最佳。首先在特定的双选信道下选择合适的均衡器及基带调制方式,然后通过对均衡接收后残余干扰及噪声的理论分析,建立优化模型,并采用遍历法,逐次扫描,寻找最佳的调制阶数,得到最优的系统性能。理论分析和仿真结果表明,在双选信道下,通过优化方法,得到了混合载波调制系统最佳的调制阶数(a),其最佳调制阶数系统的性能优于单/多载波调制系统。In order to solve the interference-suppression problem of the hybrid carrier modulation(HCM)sys-tem based on weighted-type fractional Fourier transform(WFRFT)under doubly-selective channel,the optimi-zation method is proposed to optimize the performance of the HCM system.Firstly,the appropriate baseband modulation mode and equalizer under the specific doubly-selective channel were selected,and then the opti-mum model was established through the theoretical analysis of the residual interference and noise after equali-zation.The optimum modulation order(α)can be obtained by the traversal method to get the optimal perform-ance of the HCM system.Theoretical analysis and simulation results show that the optimum modulation order(α)can be obtained by the optimization method,and the performance of the HCM system is better than the single carrier modulation system and multi-carrier modulation system when modulation order is optimum under the doubly-selective channel.

关 键 词：加权分数阶傅里叶变换 混合载波调制 均衡 优化方法 

分 类 号：TN914.42[电子电信—通信与信息系统]