An Estimation Method of Direct Spread Signal Pseudo-Code Rate Based on Delay-and-Multiplication Autocorrelation

In order to solve parameter estimation problem of Direct spread signal (DS signal) pseudo-code rate in low SNR, the generation mechanism of DS signal and autocorrelation characteristics are deeply studied. The received DS signal is processed by follows, such as delay-and-multiply, autocorrelation, low-pass filtering and fast fourier transform, which reduce noise interference. Finally the effective estimation of pseudo-code rate can be realized by searching for the pseudo-code rate spectral lines. Finally by searching for pseudo-code rate spectral lines method can realize the effective estimation of pseudo-code rate. In the case of SNR is -16dB, Simulation results show that the method can realize effective estimation of the pseudo-code rate parameters. And effective estimation of pseudo-code rate in lower SNR can be realized by increasing the processing data points.