Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2004-09-03
2008-08-12
Payne, David C. (Department: 2611)
Pulse or digital communications
Equalizers
Automatic
C375S229000, C375S232000
Reexamination Certificate
active
07412000
ABSTRACT:
A maximum likelihood CCK detector has a first subtractor which subtracts the contents of a pre-equalize register from a current symbol, and the output of this subtractor is coupled to a simple Fast Walsh Transform (FWT) with an iteration variable k. The output of the FWT is coupled to a second subtractor for subtracting a plurality of ICI corrections for all possible current symbols computed from the post-FWT domain value of the current CCK symbol and stored in post equalization registers. A post equalization register contains values computed from feedback filter coefficients determined during a packet preamble, where the feedback filter coefficients are provided to a reduced complexity post equalization value generator which populates the post equalization register using an iteration variable i.
REFERENCES:
patent: 5402445 (1995-03-01), Matsuura
patent: 6233273 (2001-05-01), Webster et al.
patent: 6563858 (2003-05-01), Fakatselis et al.
patent: 6674818 (2004-01-01), King et al.
patent: 6690715 (2004-02-01), Webster et al.
patent: 6748011 (2004-06-01), Ekvetchavit et al.
patent: 7180963 (2007-02-01), Wang et al.
patent: 7187730 (2007-03-01), Hu et al.
patent: 7277515 (2007-10-01), Yen
patent: 2004/0190440 (2004-09-01), Kim et al.
patent: 2004/0196933 (2004-10-01), Shan et al.
patent: 2005/0053172 (2005-03-01), Heikkila
Cosovic, Ivan, “Performance of Coded Uplink MC-CDMA with Combined-Equalaztion in Fadin Channels”, German Aerospace Center, Institute of Communications and Navigation.
Cosovic, Ivan, “Pre- Post- and Combined -Equalization Single-User Bounds for MC-CDMA”, 2004, European Conference on Wireless Technology, 321-324.
Dlugaszewski, Z., “Performance of Several OFDM transceivers in the indoor radiochannels in 17GHz band”, 2001, Vehicular Technology Conference, vol. 2, 825-829.
Cosovic, Ivan, “Combined Pre- and Post- Equalization for uplink time division duplex MC-CDMA in Fading Channels”, 2004, Kluwer Academic Publishers.
Audeh, Kahn and Barry, “Decision-Feedback Equalization of Pulse-Position Modulation on Measured Non-Directed Indoor Infrared Channels”, IEEE Transactions on Communications V47, No. 4, Apr. 1999.
Hwang, Liu & Han, Novel Block Equalization Design for Wireless Communications with ISI and Rayleigh Fading Channels, National University of Science & Technology, Touliu, Yulin, Taiwan ROC.
Batabyal & Sarmah, “A Computationally Efficient Algorithm for Code Decision in CCK Based High Data Rate Wireless Communications”, Hellosoft, Hederabad, India.
Lin, Chang, Huang & Lin, “A Flexible Design for a Decision Feedback Equalizer and a Novel CCK Technique for Wireless LAN Systems”, National Chung-Hsing University, Taiwan ROC.
Barman, Bansiomar, & Reddy, “A Reduced Complexity Decision Feedback Equalization in Spread Spectrum Based in LAN”, Hellosoft, Hyderabad, India.
Barman and Halipatil, “ICI Equalizer in a CCK Based DSSS Communication System”, Hellosoft, Hyderabad, India.
Murali Parthasarathy
Sailaja Sankabathula Dharani Naga
Venkatesh Narasimhan
Chesavage Jay A.
Payne David C.
RedPine Signals, Inc.
Stevens Brian J
LandOfFree
Maximum likelihood block decision feedback estimation for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Maximum likelihood block decision feedback estimation for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Maximum likelihood block decision feedback estimation for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3993192