摘要
在频谱监测、电子侦听等非协作通信中,接收机要对直接扩频序列信号进行侦收,必须要首先估计信号的参数,包括波特率、码片速率和载波频率等。由于噪声功率电平远高于接收到的信号功率电平,常规的基于能量和谱的参数估计方法在此并不适用。针对这些问题提出了一种估计算法,该算法首先对接收信号的自相关函数进行累积以消除噪声的影响,然后在此基础上估计信号的波特率、码片速率和载波频率。所有这些算法都不需要知道DSSS信号的具体调制类型。计算机仿真结果表明了这些算法的有效性。
In non-cooperative communication systems such as spectrum surveillance and electronic interception, the receiver must estimate the parameters of direct spread spectrum sequence (DSSS) signal, including baud rate, chip rate and carrier frequency for demodulation. Because the noise power is much higher than the power of the intercepted signal, the ordinary method based on the power spectrum is not available. An estimation algorithm is proposed. The algorithm eliminates the effect of noise based on the cumulation of the self-correlation functions of the received signal, then estimates the values of baud rate, chip rate and carrier frequency. In the algorithm, it is not necessary to know the modulation type. Computer simulations verify the effectiveness of the algorithm.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2004年第9期1176-1178,1197,共4页
Systems Engineering and Electronics
关键词
直接扩频序列信号
参数估计
波特率
chip率
载波频率
direct spread spectrum sequence
parameter estimation
baud rate
chip rate
carrier frequency
