Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2008-05-06
2008-05-06
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S349000
Reexamination Certificate
active
07369631
ABSTRACT:
A symbol synchronizer (100) is provided for a software-defined communications system (10). The symbol synchronizer (100), when integrated into either a pre- or post-detection diversity signal combiner (108, 208), enables highly accurate signal synchronization with minimal added system complexity. The symbol synchronizer (100) includes a single complex sliding window-matched filter (102) for filtering an input digital signal with a match filtering function based on predetermined signal transfer function characteristics to average out receiver noise from the signal. A signal delay bank (84) includes a plurality of delay blocks each for delaying the digital signal filtered by the single matched filter for a predetermined number of samples. A complex correlator (88) correlates the digital signal filtered by the single complex sliding window matched filter (102) and delayed by the complex correlator (88) with a correlator reference signal, and selects an index of a path having a peak correlator value. As a result of such a configuration, the symbol synchronizer (100) is capable of determining symbol boundaries of channel signals in a multi-channel communications system to enable system signal measurement statistics and demodulated to be more accurately generated.
REFERENCES:
patent: 5297171 (1994-03-01), Koch
patent: 6304750 (2001-10-01), Rashid-Farrokhi et al.
patent: 6987746 (2006-01-01), Song
patent: 2002/0041637 (2002-04-01), Smart et al.
patent: 2002/0061056 (2002-05-01), Smolyar et al.
patent: 2004/0190603 (2004-09-01), Dabak et al.
“Blind Algorithms for Joint Clock Recovery and Baseband Combining in Digital Radio”, F. Guglielmi et al., Radio Relay Systems Conference, Publication No. 386, Oct. 1993, pp. 279-286.
“Combined Equalization, Decoding, and Antenna Diversity Combining for Mobile/Personal Digital Radio Transmission Using Feedforward Synchronization”, S. A. Fachtel et al., Proceedings of Vehicular Technology Conference, 43rdIEEE, 1993, pp. 633-636.
“Performance of Nonlinear Receivers in Mobile Communications”, A.R.S. Bahai, Proceedings of ICC, vol. 2, 1993, pp. 1209-1212.
Digital Communications,B. Sklar, Fundamentals and Applications, Prentice Hall, 1988. (not included).
Digital Communications,J.G. Proakis, 3rdEd. McGraw-Hill, 1995. (not included).
“Blind Adaptation Using Maximin Algorithm”, D. Torrieri et al., Asilomar Conference on Signals, Systems and Computers, Nov. 1993, pp. 638-642.
Digital Communication Receivers,H. Meyr et al., John Wiley & Sons, 1998. (not included).
“Joint Blind Equalization, Carrier Recovery, and Timing Recovery for 64-QAM and 128-QAM Signal Constellations”, N.K. Jablon, Proceedings of ICC, vol. 2, 1989, pp. 1043-1049.
“Digital Communications in Fading Channels”, Mission Research Corporation, Final Report PL-TR-92-1024, Mar. 1993. (not included).
“Real-time Implementation of a Reconfigurable IMT-2000 Base Station Channel Modem”, D. Murotake et al., Software and DPS'IN Radio, IEEE Communications Magazine, Feb. 2000, pp. 148-152.
“An ADEPT Performance Model of the Mercury RACEway Crossbar Interconnection Network”, G. Han et al., PROCEEDINGS of 6THAnnual Conference on Parallel Interconnects (PI'99), pp. 83-90.
Bergstrom Chad S.
Chuprun Jeffery Scott
Gifford Carl Steven
Kleider John Eric
Fan Chieh M.
General Dynamics C4 Systems, Inc.
Jenner & Block LLP
Perilla Jason M.
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