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APSK调制在新一代卫星广播系统中得到广泛应用。本文研究了APSK信号的位定时恢复环路,提出将一种Gardner位定时误差检测改进算法应用于该环路,并仿真比较了采用传统DD-Gardner位定时误差检测算法与采用新的改进算法的位定时恢复环路的时钟捕获和跟踪性能。
APSK modulation is widely used in next-generation satellite broadcasting systems. In this paper, the bit timing recovery loop of APSK signal is studied. A modified Gardner bit timing error detection algorithm is proposed for this loop. The simulation is compared with the traditional DD-Gardner bit timing error detection algorithm and the new improved algorithm Bit timing recovery loop clock capture and tracking performance.