Multiplex communications – Wide area network – Packet switching
Patent
1994-07-26
1996-09-03
Kizou, Hassan
Multiplex communications
Wide area network
Packet switching
375205, 375207, 375343, 375346, 380 34, H04B 1707, H04T 1304
Patent
active
055530621
ABSTRACT:
A spread-spectrum code division multiple access interference canceler system and method for reducing interference in a spread-spectrum CDMA receiver having N chip-code channels, with each of the N channels identified by a distinct chip-code signal. The interference canceler system comprises a plurality of interference cancelers, each having chip-code generators, delay devices, correlators, spread-spectrum-processing circuits, and subtracting means. Using a plurality of chip-code signals, the correlators despread the spread-spectrum CDMA signal as a plurality of despread signals, respectively. The spread-spectrum-processing circuits use a timed version of the plurality of chip-code signals, generated by the delay devices, for spread-spectrum processing the plurality of despread signals, respectively, with a timed chip-code-signal corresponding to a respective despread signal. For recovering a channel, subtracting means subtracts the spread-spectrum-processed-despread signals other than the signal of the desired channel of the spread-spectrum CDMA signal. The system may further comprise a CDMA/DS detector for receiving a spread-spectrum signal, a plurality of interference cancelers connected in series for generating a plurality of estimates of the spread-spectrum signal, combining means for combining the estimates as averaged estimates, and decision means for receiving the averaged estimates.
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Kowalski John
Moshavi Shimon
Schilling Donald L.
InterDigital Communication Corporation
Kizou Hassan
Rao Seema S.
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