Pulse or digital communications – Receivers – Automatic baseline or threshold adjustment
Reexamination Certificate
2007-03-27
2007-03-27
Kim, Kevin (Department: 2611)
Pulse or digital communications
Receivers
Automatic baseline or threshold adjustment
C375S322000, C375S287000
Reexamination Certificate
active
09240275
ABSTRACT:
An improved decoding technique useful for hard decision decoding, such as quadrature phase shift keying (PSK) and quadrature amplitude modulation (QAM), as well as soft-decision techniques, such as Viterbi decoding and trellis decoding. The system in accordance with the present invention provides adaptive decision regions for hard-decision decoding techniques and adaptive metrics for soft-decision detection techniques in which the decision boundaries and reference constellations, respectively are optimized in order to minimize the bit error rate (BER). In particular, the decision boundaries and metrics are optimized based on the locations of the received constellation points. By adaptively adjusting the decision boundaries and metrics, the BER can be greatly improved with the need for nonlinear predistortion at the transmitter thus reducing the hardware complexity and weight of the transmitter which provides additional benefits in applications, such as satellite communication systems, where the transmitter is located on the satellite.
REFERENCES:
patent: 4099121 (1978-07-01), Fang
patent: 4873701 (1989-10-01), Tretter
patent: 5307377 (1994-04-01), Chouly et al.
patent: 5343499 (1994-08-01), Jasper et al.
patent: 5363408 (1994-11-01), Paik et al.
patent: 5384810 (1995-01-01), Amrany
patent: 5440259 (1995-08-01), Yokomura
patent: 5440268 (1995-08-01), Taga et al.
patent: 5442655 (1995-08-01), Dedic
patent: 5485489 (1996-01-01), Chiba
patent: 5491698 (1996-02-01), Patel et al.
patent: 5500876 (1996-03-01), Nagata
patent: 5519356 (1996-05-01), Greenberg
patent: 5537439 (1996-07-01), Choi
patent: 5550868 (1996-08-01), Boccuzzi
patent: 5598441 (1997-01-01), Kroeger et al.
patent: 5604768 (1997-02-01), Fulton
patent: 5612651 (1997-03-01), Chethik
patent: 5615230 (1997-03-01), Günther et al.
patent: 5640417 (1997-06-01), Barabash et al.
patent: 5654986 (1997-08-01), Lim
patent: 5710793 (1998-01-01), Greenberg
patent: 5761216 (1998-06-01), Sotome et al.
patent: 5832039 (1998-11-01), Rijns
patent: 6487261 (2002-11-01), Iwamatsu et al.
patent: 3239043 (1991-10-01), None
patent: 5236039 (1993-09-01), None
patent: 7288552 (1995-10-01), None
“Error Bounds for Convolutional Codes and Asymptotically Optimum Decoding Algorithm” by A.J. Viterbi,IEEE Trans. Inf. Theory, IT-13pp. 260-269, Apr. 1967.
“Error Coding Cookbook”, by C. Britton Rorabaugh, McCraw Hill copyright 1996, pp. 105-125.
Becker James C.
Berger Harvey L.
Friedberg Samuel J.
Kim Kevin
Northrop Grumman Corporation
Paniaguas John S.
LandOfFree
Adaptive decision regions and metrics does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive decision regions and metrics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive decision regions and metrics will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3724769