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Spread spectrum signals are now widely used for secure communications, as well as for multiple access interference (MAI). They have many interesting properties, including low probability of interception. Indeed, DS/SS transmitters use a periodical pseudo-random sequence to modulate the baseband signal before transmission. A receiver which does not know the sequence can not demodulate the signal. Blind...
Without the knowledge of the userspsila carrier frequency or the channel parameters, this paper proposes a new arithmetic to blind estimate the pseudo-random sequences, based on the space-time complex independent component analysis (ST-CICA), phase lock loop (PLL) and principal component analysis (PCA). The received carrier modulated signals are firstly separated by the ST-CICA, while the multi-path...
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