Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2011-03-29
2011-03-29
Fan, Chieh M (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S316000, C375S136000, C375S137000, C375S147000, C375S148000, C375S150000, C375S152000, C375S229000, C375S232000, C375S346000
Reexamination Certificate
active
07916817
ABSTRACT:
A method for reducing interference from at least one narrowband interferer in a pilot symbol assisted receiver (10) includes the steps of; receiving a stream of received data, passing the stream of received data through an adaptive filter that reduces interference from any narrowband interferer, passing the filtered data through a correlator (7, 8) arranged to detect pilot symbols, when a pilot symbol is detected passing the stream of received data to a receiving apparatus without first passing the received data through the adaptive filter (3), and wherein the pilot symbol includes one or more repetitions of known data or pseudo noise.
REFERENCES:
patent: 4910521 (1990-03-01), Mellon
patent: 5192918 (1993-03-01), Sugiyama
patent: 5355126 (1994-10-01), Nelson et al.
patent: 5787118 (1998-07-01), Ueda
patent: 6169770 (2001-01-01), Henely
patent: 6400781 (2002-06-01), Vandendorpe et al.
patent: 6590833 (2003-07-01), Teller
patent: 6807224 (2004-10-01), Takahashi et al.
patent: 6904079 (2005-06-01), Hoffmann et al.
patent: 2001/0033625 (2001-10-01), Ninomiya et al.
patent: 2002/0094020 (2002-07-01), Yellin
patent: 2002/0106018 (2002-08-01), D'Luna et al.
patent: 2002/0173341 (2002-11-01), Abdelmonem et al.
patent: 2002/0196876 (2002-12-01), Takada
patent: 2003/0235254 (2003-12-01), Fanson et al.
patent: 2004/0100939 (2004-05-01), Kriedte et al.
patent: 2004/0109670 (2004-06-01), Kim et al.
patent: 2004/0136478 (2004-07-01), Yu et al.
patent: 2004/0198452 (2004-10-01), Roy
patent: 0 721 264 (1996-07-01), None
patent: 1 176 731 (2002-01-01), None
patent: 1 202 468 (2002-05-01), None
patent: 1 263 179 (2002-12-01), None
patent: WO 99/05815 (1999-02-01), None
patent: WO 02/23781 (2002-03-01), None
patent: WO 02/069515 (2002-09-01), None
patent: WO 02/101953 (2002-12-01), None
patent: WO 03/090422 (2003-10-01), None
M.G. Amin et al., “Optimum Interference Excision in Spread Spectrum Communications Using Open-Loop Adaptive Filters,” IEEE, v. 47, No. 7, Jul. 1999.
R. Nilsson et al., “A Narrow-Band Interference Canceller for OFDM-based Systems,” 4th Euro. Personal Mobile Com. Conf., Feb. 2001.
G.J. Saulnier et al., “Performance of a Spread Spectrum OFDM System in a Dispersive Fading Channel with Interference,” IEEE, 1998.
J.A. Young et al., “Performance Metrics for Windows Used in Real-Time DFT-Based Multiple-Tone Frequency Excision,” IEEE, 1999.
S. Kapoor et al., “Interference Suppression in DMT Receivers Using Windowing,” IEEE, 2000.
L.B. Milstein et al., “An Analysis of a Real-Time Transform Domain Filtering Digital Communication System-Part I: Narrow-Band Interference Rejection,” IEEE, 1980.
S.D. Sandberg, “Adapted Demodulation for Spread-spectrum Receivers which Employ Transform-Domain Interference Excision,” IEEE, 1995.
G. Carron et al., “Comparison of Two Modulation Techniques Using Frequency Domain Processing for In-House Networks,” IEEE, 2001.
K. Witrisal, “Impact of DC-offsets and Carrier Feed-through on Correlation-based Frequency Synchronization for OFDM,” 6th Intl. OFDM Workshop, 2001.
D. Gerakoulis et al., “An Interference Suppressing OFDM System for Wireless Communications,” IEEE, 2002.
M. Kuhn et al., “Linear block codes for frequency selective PLC channels with colored noise and multiple narrowband interference,” IEEE, 2002.
R.W. Lowdermilk et al., “Interference Mitigation in Orthogonal Frequency Division Multiplexing (OFDM),” IEEE, 1996.
J.G. Proakis, “Interference Suppression in Spread Spectrum Systems,” IEEE, 1996.
T.K. Blankenship, “Design and Implementation of a Pilot Signal Scanning Reeiver for CDMA Personal Communication Services Systems,” May 1998.
S.J. Howard, “Narrowband Interference Rejection Using Small FFT Block Sizes,” IEEE, 1992.
Dann Dorfman Herrell and Skillman, P.C.
Fan Chieh M
Industrial Research Limited
Lee Siu M
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