摘要
利用Simulink建立了采用网格编码调制(TCM)的跳频系统模型和窄带、多音、跟踪3种干扰的仿真模型.在3种干扰情况下,限定输出端失真度不大于5%,通过在输入端改变信源频率,得出TCM-8PSK系统未加干扰以及加3种干扰情况下的误码率情况,并计算出各干扰对于原系统误码率的相关系数,经对比可知该系统受各干扰的影响程度由强到弱依次为:跟踪干扰,窄带干扰,多音干扰;为提高抗跟踪干扰能力,在对系统幅频特性进行测量后发现该曲线两端衰落过快,为此对系统采用LC校正电路进行幅频补偿,提高了系统抗跟踪干扰能力.
A frequency hopping system model using trellis coded modulation(TCM)and a simulation model of narrowband,multi-tone and tracking interference are established by simulation model.The distortion degree at the output is limited to not more than 5%under the three interference conditions.By changing the source frequency at the input,the BER conditions of TCM-8PSK system without interference and with three interference conditions are obtained,and the correlation coefficient of each interference to the BER of the original system is calculated.Through comparison,it is found that the system is most affected by tracking interference,narrowband interference is second,and multi-tone interference is weakest.In order to improve the ability to resist tracking interference,the amplitude-frequency characteristics of the system are measured.After measuring,it is found that the two ends of the curve fade too fast.Therefore,LC correction circuit is adopted to compensate the amplitude-frequency of the system,thus improving the anti-tracking interference capability of the system.
作者
刘家昊
章小梅
LIU Jiahao;ZHANG Xiaomei(Qingdao Campus,Naval Aeronautical University,Qingdao 266041,China)
出处
《沈阳大学学报（自然科学版）》
CAS
2019年第5期394-399,共6页
Journal of Shenyang University：Natural Science
基金
国家社会科学基金军事学项目(16GJ003-111)
关键词
TCM-8PSK调制
失真度
误码率
相关系数
LC校正
TCM-8PSK modulation
degree of distortion
bit error rate
correlation coefficient
LC correction
