Detection & discrimination of covert DS/SS signals using triple correlation
Mamdouh Gouda, E.R. Adams, Peter C. Hill · 2002
In light of the growing use of direct sequence spread spectrum techniques and the increasingly congested communication environments, conventional linear and nonlinear intercept receivers are ineffective in detecting direct-sequence spread spectrum (DS/SS) signals if the transmissions are designed to be covert and the chip code sequences are unavailable. An investigation into using correlation-based processing is reported showing that the cyclostationary property of DS/SS provides detection capability. Results are given of a feasibility study into using the triple correlation function (TCF) for DS/SS detection taking into account the discrete polynomial structure of the chip code sequences involved. However, it is possible under certain conditions to detect and estimate the DS/SS length and its code generating function g(X).