基于延迟相乘-相关及谱分析的直扩信号检测与符号周期、码片时宽估计分析

The Detection,Symbol Period and Chip Width Estimation of DSSS Signals Based on Delay-Multiply,Correlation and Spectrum Analysis

该文基于直扩信号经过延迟相乘处理后表现出的周期性,提出了一种对直扩信号检测的有效方法——基于延迟相乘-相关及谱分析的直扩信号检测法。计算机仿真显示该方法不但能够适应直扩信号检测的低信噪比要求,而且能方便地实现对直扩信号符号周期和码片时宽的估计。特别地,该方法能够在数据采样速率不变的情况下通过增加算法所处理的采样数据长度来提高对符号周期估计的精度,这在对直扩信号的检测中是非常重要的。

Based on the periodicity that the signals which are gotten by doing delay-multiply with the Direct Sequence Spread Spectral （DSSS） signals, the paper proposes an efficient method for the detection of DSSS signals： the detection, symbol period and chip width estimation of DSSS signals based on delay-multiply, correlation and spectrum analysis. The computer simulations show that it can not only fit the need of the low signal to noise ratio which is quite common in the detection of DSSS signals, but also can give the estimations of the symbol period and chip width in a simple way. Especially, the method proposed in the paper can enhance the precision of the symbol period estimation by increasing the processed sampling data when the sampling rate is flied, which is very important for the detection of DSSS signals.