Four frequency-shift keying (4-FSK) spread spectrum modulator and demodulator
Murray, Terrence J.
Ha, Tri T.
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This thesis explores the potential use of a four frequency-shift keying (4-FSK), spread spectrum modulator and demodulator (MODEM) in a low orbit satellite. In this first approach a short maximal length sequence of 127 chips would be used to spread the four frequencies. After successful implementation, the design could be extended to longer codes which would provide for greater processing gain. This MODEM was not preselected for use in satellite communications based on the merits of 4-FSK, but was assigned as one of four possible digital communication designs. A MODEM would be selected for use in the Petite Amateur Navy Satellite after a thorough design review.
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