Title :
Detection & discrimination of covert DS/SS signals using triple correlation
Author :
Gouda, Mamdouh ; Adam, Ernest R. ; Hill, P.C.J.
Author_Institution :
Dept. of Inf. & Simulation, Cranfield Univ., Swindon, UK
Abstract :
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)
Keywords :
code division multiple access; correlation methods; m-sequences; polynomials; pseudonoise codes; signal detection; spread spectrum communication; chip code sequences; code generating function; correlation-based processing; covert DS/SS signals; cyclostationary property; detection capability; direct sequence spread spectrum techniques; discrete polynomial structure; length; receivers; triple correlation; Informatics; Interference; Military communication; Milling machines; Multiaccess communication; Signal analysis; Signal design; Signal processing; Spread spectrum communication; Wideband;
Conference_Titel :
Radio Science Conference, 1998. NRSC '98. Proceedings of the Fifteenth National
Conference_Location :
Cairo
Print_ISBN :
0-7803-5121-5
DOI :
10.1109/NRSC.1998.711496