Pulse or digital communications – Repeaters – Testing
Patent
1985-11-05
1991-03-19
Tarcza, Thomas H.
Pulse or digital communications
Repeaters
Testing
375 85, 375 87, 375 94, 375 96, 375 83, 364819, 455 61, 329304, 329305, 329306, 380 46, H04L 2730
Patent
active
050017233
ABSTRACT:
A spread spectrum communications system is described for recovering data from a signal having a first carrier frequency modulated by one of at least four phase modulations, each phase modulation orthogonal to one another and the signal further modulated by a predetermined spreading function incorporating a frequency synthesizer for generating a plurality of frequencies, including one of the phase modulations, a plurality of mixers, a combiner, a broadband convolver, a second combiner coupled to a reference signal generator for generating respective orthogonal modulations on spaced apart carrier frequencies, a power divider coupled to the output of the convolver and filters each having a frequency passband for recovering or separating the output signals of the convolver. The invention overcomes the problem of additional hardware complexity to accomodate Walsh orthogonal functions and of requiring a plurality of broadband convolvers to decode a plurality of orthogonal modulations of lesser bandwidth.
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Allied-Signal Inc.
Gregory Bernarr Earl
Massung Howard G.
Tarcza Thomas H.
Walsh Robert A.
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