Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1996-12-10
1998-07-28
Ghebretinsae, Temesghen
Pulse or digital communications
Receivers
Interference or noise reduction
375206, 370342, 370441, 455296, H04B 110, H03D 104
Patent
active
057871302
ABSTRACT:
A technique for decoding and removing a single subscriber's signal from a composite signal in a DS-CDMA system is provided. A particular subscriber's signal is removed from the composite signal by despreading the composite signal (120) to form a multiplicity of despread QPSK signals representative of multiple subscribers. Next, multipath characteristics are determined (303) for each of the multiple subscribers. Utilizing multipath characteristics (204), the multiple subscribers' signals are determined by combining multipath components of each signal (305). Next, data related to a particular subscriber is determined (307) and the subscriber's signal is "reconstructed" to contain multipath characteristics (204) as originally received (309). Finally, the reconstructed signal is output to a summing node (128) where it is combined with the delayed composite signal (120).
REFERENCES:
patent: 5235612 (1993-08-01), Stilwell et al.
patent: 5418814 (1995-05-01), Hulbert
patent: 5553062 (1996-09-01), Schilling et al.
patent: 5687162 (1997-11-01), Yoshida et al.
Kotzin Michael D.
Meidan Reuven
Ghebretinsae Temesghen
Haas Kenneth A.
Motorola Inc.
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