CAJ | 학술논문

针对时相调制功率谱的特殊性，设计了一种能够提取时相调制相位突变特征的陷波滤波技术。根据输入的时相调制信号参数，设计对应的陷波滤波器；然后对接收信号进行滤波，利用陷波特性将相位突变时间段内的信号幅度突显出来，从而将时相调制信号的相位信息转化为可被门限检测的幅度信息；最后针对陷波滤波效果、系统误码性能以及频带利用率进行了仿真与分析。仿真表明，时相调制系统中采用陷波滤波技术，不仅可以完成对输入数字信息的有效恢复，而且使系统传输性能保持很好，并能有效提高频带利用率。
침대시상조제공솔보적특수성，설계료일충능구제취시상조제상위돌변특정적함파려파기술。근거수입적시상조제신호삼수，설계대응적함파려파기；연후대접수신호진행려파，이용함파특성장상위돌변시간단내적신호폭도돌현출래，종이장시상조제신호적상위신식전화위가피문한검측적폭도신식；최후침대함파려파효과、계통오마성능이급빈대이용솔진행료방진여분석。방진표명，시상조제계통중채용함파려파기술，불부가이완성대수입수자신식적유효회복，이차사계통전수성능보지흔호，병능유효제고빈대이용솔。
Considering the power spectrum of time-phase modulation (TPM), this paper presents a notch filter design technique which can extract the phase change characteristics of TPM. The notch filter is designed according to the parameters of TPM signals. The received TPM signals are filtered by the notch filter, which can weaken the amplitude of time-phase modulation signals at the carrier frequency point and highlight the amplitude at phase change period at the same time. So the phase change information is converted into the amplitude information that can be detected through some amplitude threshold. Finally, the detailed simulation and analysis on notch filter effect, BER performance and bandwidth efficiency are presented. The simulation results show that the TPM system adopting notch filter technology can effectively recover the input digital information and improve the bandwidth efficiency, while maintaining the system transmission performance.