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提出一种新颖的全数字PN码跟踪,该跟踪环采用符号判决电路和数字序贯滤波器取代经典的环路滤波器来提高衰落环境下的跟踪性能。通过将定时调整过程等效为一时间离散变量离散的齐次马尔可夫链,导出了瑞利衰落下该环路定时误差的稳态概率分布,并对该结果进行了计算机仿真验证。
A novel all-digital PN code tracking is proposed. The tracking loop uses the symbol decision circuit and the digital sequential filter instead of the classical loop filter to improve the tracking performance in the fading environment. By equating the timing adjustment process to a discrete homogeneous Markov chain of discrete time variables, the steady-state probability distribution of the timing error of the loop under Rayleigh fading is derived, and the result is verified by computer simulation.