A semi-blind method based on principal component analysis (PCA) and sequence synchronisation is proposed to detect direct sequence spread-spectrum (DSSS) signals in a noncooperative setting under low signal-to-noise ratio (SNR) conditions. The intercepted signal is segmented to form a detection matrix from which a feature is extracted through cyclic shifting. Signal detection is then performed using a test statistic based on this feature. The carrier frequency and sequence duration of the signal to be detected are assumed known. Theoretical analysis and a computer simulation study show that the performance of the new detection method is superior to classic energy detection (ED) in an additive white Gaussian noise (AWGN) channel.
Reference:
Vlok, JD and Olivier, JC. 2012. Non-cooperative detection of weak spread-spectrum signals in AWGN. IET Communications, vol. 6(16), pp. 2513-2524
Vlok, J., & Olivier, J. (2012). Non-cooperative detection of weak spread-spectrum signals in AWGN. http://hdl.handle.net/10204/6448
Vlok, JD, and JC Olivier "Non-cooperative detection of weak spread-spectrum signals in AWGN." (2012) http://hdl.handle.net/10204/6448
Vlok J, Olivier J. Non-cooperative detection of weak spread-spectrum signals in AWGN. 2012; http://hdl.handle.net/10204/6448.