Pulse or digital communications – Repeaters – Testing
Patent
1993-12-07
1995-11-21
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
380 33, H04B 169
Patent
active
054694698
ABSTRACT:
A composite spread spectrum signal including modulator and demodulator therefor is disclosed. The composite signal having a multi-dimensional signal space, comprising a pulse position modulation dimension generated by varying starting positions of cyclically repeated chipping sequences, a frequency shift key dimension generated by varying a carrier frequency between a plurality of frequencies, code shift keyed dimensions generated by selecting the chipping sequences from among a plurality of orthogonal sequences, and amplitude shift key dimensions generated by selecting amplitudes of each subcarrier for each message bundle. This signal may further comprise a phase shift key dimension generated by assigning a phase relationship of the orthogonal subcarriers.
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Cangialosi Salvatore
University of Massachusetts Lowell Research Foundation
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