Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2005-09-13
2005-09-13
Liu, Shuwang (Department: 2634)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S346000, C375S348000, C455S296000, C455S306000
Reexamination Certificate
active
06944245
ABSTRACT:
An iterative method (400) and apparatus (200) for a receiver for reducing interference in a desired signal in a GSM communication system that use a finite-impulse-response filter combined with alternate quadrature component output selection for alternate linear equalization. The method includes inputting a burst of data of a received waveform including interference, training an alternate linear output filter with a midamble of known quadrature phase, providing an estimate of the desired signal by operating on the received waveform with the finite-impulse-response filter, generating log likelihood ratio estimates for a plurality of bits in the burst of data, selecting bits from the burst of data base upon a predetermined condition, and re-training the alternate linear output filter to provide a second improved estimate of the desired signal.
REFERENCES:
patent: 5933768 (1999-08-01), Skold et al.
patent: 6026130 (2000-02-01), Rahmatullah et al.
patent: 6044111 (2000-03-01), Meyer et al.
patent: 6144710 (2000-11-01), Chen et al.
patent: 6314147 (2001-11-01), Liang et al.
patent: 6604220 (2003-08-01), Lee
patent: 2002/0131488 (2002-09-01), Alpress et al.
patent: 2002/0131489 (2002-09-01), Alpress et al.
patent: 2004/0161065 (2004-08-01), Buckley et al.
patent: WO 98/16021 (1998-04-01), None
patent: WO 00/64061 (2000-10-01), None
patent: WO 01/50291 (2001-07-01), None
U.S. Appl. No. 10/366,106, filed Feb. 13, 2003, Buckley et al.
“Downlink GMSK Interference Suppression Performance Evaluation”, 3GPP TSG GERAN #9, Seattle, WA, USA, Apr. 15th-19th2002, Ericsson, 15 pages.
“Single Antenna Interference Cancellation in MS for GSM Networks”, 3GPP TSG-GERAN #9, Seattle, WA, USA, Apr. 15th-19th2002, Cingular Wireless, Philips Semidonductors, SBC Technology Resources, Inc., 4 pages.
“Laboratory & Field Testing of SAIC for GSM Networks”, 3GPP TSG GERAN #11, Los Angeles, CA, USA, Cingular Wireless, Philips Semiconductors, 20 pages.
Piero Castoldi, Richardo Raheli and Giovanni Marion, “Efficient Trellis Search Algorithms for Adaptive MLSE on Fast Rayleigh Fading Channels”, Dipartimento di Ingegneria del'Informazione, Universita di Parma, Parma—Italy, 1994 IEEE, 5 pages.
Abdulrauf Hafeez, Karl J. Molnar, Gregory E. Bottomley, “Co-Channel Interference Cancellation for D-AMPS Handsets”, EECS Dept., U. of Michigan, Ericsson Inc., 1999 IEEE, 6 pages.
Hafedh Trigui and Dirk T.M. Slock, “Training Sequence Based Multiuser Channel Identification for Co-Channel Interference Cancellation in GSM”, Insitu EURECOM, France, 1999 IEEE, 20 pages.
OMA Open Mobile Alliance “Download Architecture Version 1.0”, Version Jun. 10, 2002, 24 pages.
Bachu Raja S.
Buckley Michael E.
Stewart Kenneth A.
Wilkins Clint S.
Liu Shuwang
Motorola Inc.
Wang Ted M.
Watanabe Hisashi D.
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