CAJ | 학술논문

提出一种盲接收环境下的慢跳频(SFH)系统频率跳变时刻同步算法。该算法针对慢跳频系统中1跳数据包含多个调制符号的特征，通过非线性变换得到包含离散谱线的信号。利用跳频信号在每1跳内能量恒定的特性，将1跳信号均匀划分为2段，提取分段信号非线性变换后离散谱线能量差异，作为调整频率跳变时刻的判决量，通过反馈环路实现盲接收环境下频率跳变时刻的精确同步。对典型慢跳频DPSK(SFH/DPSK)系统在盲接收环境下的同步性能进行仿真，在Eb/N0大于16 dB时，算法同步性能接近10-3，验证了算法的有效性。
제출일충맹접수배경하적만도빈(SFH)계통빈솔도변시각동보산법。해산법침대만도빈계통중1도수거포함다개조제부호적특정，통과비선성변환득도포함리산보선적신호。이용도빈신호재매1도내능량항정적특성，장1도신호균균화분위2단，제취분단신호비선성변환후리산보선능량차이，작위조정빈솔도변시각적판결량，통과반궤배로실현맹접수배경하빈솔도변시각적정학동보。대전형만도빈DPSK(SFH/DPSK)계통재맹접수배경하적동보성능진행방진，재Eb/N0대우16 dB시，산법동보성능접근10-3，험증료산법적유효성。
A frequency hopping signals hop timing synchronization algorithm for Slow Frequency Hopping(SFH) system is proposed. Considering that the slow frequency hopping system has more than one symbol in a single hop, non-linear transform is used to generate the spectrum lines. Considering the energy in each hop is constant, a single hop is equally divided into two segments, and the energy difference of the spectrum lines between these segments is used to decide whether the hop timing is early or late. Then, a feedback loop is used to adjust the hop timing and make the system be synchronized. The hop timing performance is verified by computer simulation in a typical SFH/DPSK blind-receiving environment. The synchronization error is about 10-3 while Eb/N0 is more than 16 dB.