Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Reexamination Certificate
2005-03-15
2005-03-15
Pham, Chi (Department: 2667)
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
C370S441000, C375S346000
Reexamination Certificate
active
06868078
ABSTRACT:
A spread-spectrum code division multiple access interference canceller for reducing interference in a direct sequence CDMA, employed at a base station receiver having N chip-code channels. The interference canceller includes a plurality of correlators or matched filters, a plurality of spread-spectrum-processing circuits, subtracting circuits, and channel correlators or channel-matched filters. Using a plurality of chip-code signals, the plurality of correlators despreads the spread-spectrum CDMA signal as a plurality of despread signals, respectively. The spread-spectrum-processing circuits use a timed version of the chip-code signals, for spread-spectrum processing the despread signals, respectively, with a chip-code-signal corresponding to a respective despread signal. For recovering a code channel using an ithchip-code-signal, the subtracting circuits subtracts from the spread-spectrum CDMA signal, the N−1 spread-spectrum-processed-despread signals generating a subtracted signal. The N−1 spread-spectrum-processed-despread signals exclude the spread-spectrum-processed-despread signal of the ithchannel. The channel correlator or channel-matched filter despreads the subtracted signal.
REFERENCES:
patent: 5553062 (1996-09-01), Schilling et al.
patent: 6014373 (2000-01-01), Schilling et al.
Kowalski John
Schilling Donald L.
Boakye Alexander O.
InterDigital Technology Corporation
Pham Chi
Volpe and Koenig P.C.
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