CAJ | 학술논문

针对高阶部分响应连续相位调制（CPM）信号盲定时同步中存在定时精度较低以及容易出现假锁等问题，该文从脉冲幅度调制（PAM）分解的角度出发，设计了一种新的适用于高阶部分响应 CPM信号的定时同步器结构，并在此基础上结合基于马尔科夫链模型的定时假锁检测方法，提出了一种适用于高阶部分响应 CPM信号的盲定时同步算法。该算法通过对 CPM信号的 PAM脉冲进行优化处理，有效减少了匹配滤波器以及网格状态的数目，同时使用辅助定时误差检测器和假锁检测器来实时监测假锁现象。理论分析和仿真结果表明，对于四阶部分响应 CPM信号，在低信噪比并存在较大初始定时误差条件下，该算法也能够实现精确快速的定时同步。
침대고계부분향응련속상위조제（CPM）신호맹정시동보중존재정시정도교저이급용역출현가쇄등문제，해문종맥충폭도조제（PAM）분해적각도출발，설계료일충신적괄용우고계부분향응 CPM신호적정시동보기결구，병재차기출상결합기우마이과부련모형적정시가쇄검측방법，제출료일충괄용우고계부분향응 CPM신호적맹정시동보산법。해산법통과대 CPM신호적 PAM맥충진행우화처리，유효감소료필배려파기이급망격상태적수목，동시사용보조정시오차검측기화가쇄검측기래실시감측가쇄현상。이론분석화방진결과표명，대우사계부분향응 CPM신호，재저신조비병존재교대초시정시오차조건하，해산법야능구실현정학쾌속적정시동보。
To solve the issues of the poor performance and false lock in the blind timing synchronization for M-ary partial-response continuous phase modulation (CPM)signals,a new PAM-based timing synchronization scheme was developed from the perspective of pulse amplitude modulation (PAM)decomposition.A novel blind timing synchronization algorithm for M-ary partial-response CPM signals was proposed on the basis of the combination of this scheme and timing false lock detection based on Markov chain model.The algorithm reduced the number of matched filters and trellis states by optimizing the PAM pulse.Simultaneously,an auxiliary timing error detector and a false lock detector were used to monitor the appearance of false lock in real time.The analysis and simulation results show that the proposed algorithm provides accurate and rapid synchronization under low SNR and large initial timing error condition.