单音干扰下相干扩频系统早迟门延迟锁定环路性能分析

研究了单音干扰下扩频接收机延迟锁定环路（delay lock loop, DLL）的性能，提出在每个码元符号间隔内有整数个码片扩频序列的相干扩频系统中，单音干扰对DLL环路产生一个离散正弦波，而不是通常认为的高斯噪声.单音干扰下DLL环路的稳态误差，在无高斯噪声干扰的情况下，以离散正弦波形态振荡；在有高斯噪声干扰的情况下，为离散正弦波叠加高斯噪音.离散正弦波的频率、幅度和单音干扰与本地接收机的频率之差、接收信号的信息速率，以及码速率有关.

Performance analysis of delay lock loop in coherent spread-spectrum system with single tone interference

This work presented that in a coherent spread-spectrum system with spread-spectrum sequence consisting of integer chips in a symbol interval,single tone interference brings a discrete sinusoid,not a Gaussian noise as generally thought.The steady-state error of delay lock loop(DLL) under single tone interference,without Gaussian noise interference,is a state of discrete sinusoid;with Gaussian noise interference,is an addition of Gaussian noise to the discrete sinusoid.The frequency and amplitude of the discrete sinusoid wave relate to the deference between the single tone interference and the local frequency,the chip rate and the bit rate of the received signal.