Spread-time code division multiple access technique with arbitrary spectral shaping
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United States of America Patent
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Dec 29, 1992
Grant Date -
N/A
app pub date -
Nov 22, 1991
filing date -
Nov 22, 1991
priority date (Note) -
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Abstract
A spread-time code division multiple access (ST-CDMA) technique is disclosed for bandlimited access to a channel. With ST-CDMA, pseudo-random (PN) sequences are assigned to each transmitter in the multi-transmitter system, and the Fourier transform of the transmitter pulse for a given transmitter is determined by modulating the phase of the desired transmitter spectrum by the PN sequence assigned to the transmitter. The data symbols produced by the transmitter are conveyed by delayed versions of the transmitter pulse. The transmitted data for a particular transmitter is recovered at a receiver synchronized to the transmitter by sampling the output of a filter matched to the corresponding transmitter pulse.
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