Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2008-01-22
2008-01-22
Odom, Curtis (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S148000
Reexamination Certificate
active
10716085
ABSTRACT:
To receive a signal from a multiple-input-multiple-output (MIMO) communication channel, initial channel taps are generated based on an impulse response estimate of the MIMO communication channel. The received signal is pre-filtered using the initial channel taps to generate output channel taps and a corresponding output signal having an increased signal-to-noise ratio (SNR) and uncorrelated noise. The SNR is based on a ratio of the energy in a first subset of the output channel taps to the energy in a second subset of the output channel taps.
REFERENCES:
patent: 5946351 (1999-08-01), Ariyavisitakul et al.
patent: 6108517 (2000-08-01), Arslan et al.
patent: 6314147 (2001-11-01), Liang et al.
patent: 6452981 (2002-09-01), Raleigh et al.
patent: 6466616 (2002-10-01), Stenstrom et al.
patent: 2002/0110205 (2002-08-01), Piirainen
patent: 2002/0176492 (2002-11-01), Zangi et al.
patent: 2003/0035491 (2003-02-01), Walton et al.
patent: 2003/0063596 (2003-04-01), Arslan et al.
patent: 2004/0017846 (2004-01-01), Fernandez-Corbaton et al.
patent: 0952711 (1999-10-01), None
patent: 1289182 (2003-03-01), None
patent: WO 01/15399 (2001-03-01), None
patent: WO 01/35608 (2001-05-01), None
patent: WO 02/33923 (2002-04-01), None
Al-Dhahir et al. “The Finite-Length Multi-Output MMSE-DFE”IEEE Transactions on Signal Processing48(10): 2921-2936 (2000).
Al-Dhahir et al. “Finite-Length MIMO Decision Feedback Equalization for Space-Time Block-Coded Signals Over Multipath-Fading Channels”IEEE Transactions on Vehicular Technology50(4): 1176-1182 (2001).
Al-Dhahir “FIR Channel-Shortening Equalizers for MIMO ISI Channels”IEEE Transactions on Communications49(2): 213-218 (2001).
Al-Dhahir “Finite-Length Channel-Shortening Space-Time Equalizers for MIMO Linear Frequency-Selective Channels”IEEE Signals, Systems and Computers1: 705-709 (2000).
Melsa et al. “Impulse Response Shortening for discrete Multitone Transceivers”IEEE Transactions on Communications44(12): 1662-1672 (1996).
Younis et al. “Joint Prefiltering and MLSE Equalization of Space-Time-Coded Transmissions Over Frequency-Selective Channels”IEE Transactions on Vehicular Technology51(1): 144-154 (2002).
Fragouli et al. “Prefiltered Space-Time M-BCJR Equalizer for Frequency-Selective Channels”IEEE Transactions on Communications50(5): 742-753 (2002).
Duel-Hallen “Delayed Decision-Feedback Sequence Estimation”IEEE Transactions on Communications37(5): 428-436 (1989).
Al-Dhahir “Finite-Length Channel-Shortening Space-Time Equalizers for MIMO Linear Frequency-Selective Channels”Signals, Systems, and Computers, 2000. Conference Record of the Thirty-fourth Asilomar Conference1: 705-709(2000).
Bauch “Reduced-Complexity Space-Time Turbo-Equalization for Frequency-Selective MIMO Channels”IEEE Transactions on Wireless Communications1(4): 819-828 (2002).
Hafeez et al. “Interference Cancellation for EDGE via Two-User Joint Demodulation”2003 58thIEEE Vehicular Technology Conference2: 1025-1029 (2003).
International Search Report and Written Opinion for Application No. PCT/US2004/038412 mailed on Apr. 19, 2005.
Ramesh et al. “Prefilter Design for Low-Complexity Equalization of MIMO Systems”2004 IEEE 59thVehicular Technology Conference2: 871-875 (2004).
Zangi et al. “Physical-Layer Issues for Deploying Transmit Diversity in GPRS/EGPRS Networks”IEEE 54thVehicular Technology Conference2: 538-542 (2001).
Al-Dhahir et al. “The Finite-Length Multi-Input Multi-Output MMSE-DFE,”IEEE Transactions on Signal Processing, 48(10): 2921-2936 (Oct. 2000).
Al-Dhahir, Naofal “FIR Channel-Shortening Equalizers for MIMO ISI Channels,”IEEE Transactions on Communications, 49(2) 213-218 (Feb. 2001).
Duel-Hallen et al. “Delayed Decision-Feedback Sequence Estimation,”IEEE Transactions on Communications, 37(5) 428-435 (May 1989).
Duel-Hallen, Alexandra “Equalizers for Multiple Input/Multiple Output Channels and PAM Systems with Cyclostationary Input Sequences,”IEEE Journal on Selected Areas in Communications10(3) 630-639 (Apr. 1992).
Arslan Huseyin
Hafeez Abdulrauf
Hui Dennis
Ramesh Rajaram
Cameron Michael
Odom Curtis
Telefonaktiebolaget LM Ericsson (publ)
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