Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Patent
1996-05-15
1998-08-04
Pham, Chi H.
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
370441, 375206, 375207, 375208, H04B 7216
Patent
active
057905371
ABSTRACT:
A code division multiple access (CDMA) communications system comprises a plurality of CDMA transmitters and at least one reception station coupled together by a communications channel. Each CDMA transmitter encodes a digital signal with a spreading code, each bit of the digital signal being encoded by a spreading code segment comprising a multiplicity of chips. All of the transmitters transmit their respective encoded signals to the reception station asynchronously via the communications channel so as to occupy the same bandwidth. Each receiver receives the combined signals of all of the transmitters and correlates it with a selected one of the spreading code segments to detect the digital signal from the corresponding transmitter. Each receiver uses also the signal-to-noise ratios of detected signals other than its own, with respect to chip delays relative to a reference one of the signals, to suppress multiple access interference (MAI) caused by such other detected signals.
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Leib Harry
Yoon Young C.
Adams Thomas
McGill University
Ngo Ricky Q.
Pham Chi H.
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