信道突变对正交调制传输性能影响的分析方法  

Quadrature Modulation Transmission Performance Analysis Method of Channel Break Impact

作　　者：刘建成 郝学坤 王赛宇[1] 王超 姜少飞 LIU Jiancheng;HAO Xuekun;WANG Saiyu;WANG Chao;JIANG Shaofei(The 54th Research Institute of CETC,Shijiazhuang 050081,China;The 50th Research Institute of CETC,Shanghai 200331,China;Unit 31634 of PLA,Kunming 650217,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]中国电子科技集团公司第五十研究所,上海200331 [3]解放军31634部队,云南昆明611731

出　　处：《探测与控制学报》2020年第6期49-54,60,共7页Journal of Detection & Control

基　　金：河北省博士后择优项目资助(B2019003033)。

摘　　要：针对传输信道的不确定性、外界环境和射频器件等突变易对卫星通信链路产生严重影响的问题,提出了信道突变对正交调制信号传输性能影响的分析方法。该方法以典型正交调制信号为对象,建立信道突变时刻对应的信号数学模型,进而推导信号误差矢量幅度(EVM)与幅度陡降、频率变化和相位突变之间的数学关系式,同时推导得出信道突变导致的信噪比变化,进而计算对应的系统误码率。仿真和理论计算结果均表明,幅度陡降50%、相位突变25°时,信号EVM值恶化高达1.5倍以上,为后续改善系统性能提供了理论依据。Considering the satellite communication channel was uncertainty,and the sudden channel distortion seriously worsening the transmission performance of communication link,the impact of channel break on quadrature modulation transmission were researched and investigated in different dimensions.Firstly,the mathematical signal model with channel change was built for the common quadrature modulation,and then the mathematical relationship between signal error vector magnitude(EVM)and amplitude drop,frequency aberration,phase break were deduced.At the same time,the clossed expression of system error bit rate,corresponding to channel break,is also achieved.Finally,simulation results and theoretical calculation both showed that the EVM value would deteriorate more than 150%corresponding to amplitude reduction 50%and phase change 25°,which could support the improvement of system performance in theory.

关 键 词：卫星通信 信道突变 正交调制 幅度陡降 误差矢量幅度 系统误码率 

分 类 号：TN918[电子电信—通信与信息系统]