CAJ | 학술논문

频率成形脉冲是连续相位调制(CPM)信号解调所必需的调制参数,由脉冲形状和脉冲长度两个参数共同决定.该文利用CPM信号的自相关特性,深入分析了CPM信号调制参数与自相关函数之间的内在联系,并在此基础上提出了一种频率成形脉冲的盲估计算法.该算法首先实现脉冲形状的盲识别,然后将CPM信号的调制指数调整为整数,最后通过自相关函数中非零值的个数来实现脉冲长度的盲估计.计算机仿真结果与分析表明,该算法实现简单,能够在任意调制阶数和调制指数下有效估计出频率成形脉冲.
빈솔성형맥충시련속상위조제(CPM)신호해조소필수적조제삼수,유맥충형상화맥충장도량개삼수공동결정.해문이용CPM신호적자상관특성,심입분석료CPM신호조제삼수여자상관함수지간적내재련계,병재차기출상제출료일충빈솔성형맥충적맹고계산법.해산법수선실현맥충형상적맹식별,연후장CPM신호적조제지수조정위정수,최후통과자상관함수중비령치적개수래실현맥충장도적맹고계.계산궤방진결과여분석표명,해산법실현간단,능구재임의조제계수화조제지수하유효고계출빈솔성형맥충.
Frequency-shaping pulse is one of the essential modulation parameters for the demodulation of Continuous Phase Modulation (CPM), and it is determined by the pulse shape and pulse length. In this paper, based on the features of the auto-correlation of CPM-signal, an in-depth study is proposed on the internal relationship of the modulation parameters and the auto-correlation function of CPM-signal. Then a blind estimation algorithm of frequency-shaping pulse is developed. First, the pulse shape is identified; second, the modulation index of the CPM-signal is adjusted to an integer; Finally, the pulse length is estimated using the number of non-zero value of auto-correlation function of CPM-signal. The simulation study shows that the proposed algorithm has the ability to provide a good estimation of frequency-shaping pulse of CPM-signal with any arbitrary modulation order and modulation index. In addition, the algorithm design is computation efficient and thus facilitates hardware implementation.