Parameter estimation for direct spread spectrum sequence signals
Zhengxin Ma · Systems engineering and electronics · 2004
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.