Multiplex communications – Wide area network – Packet switching
Patent
1993-06-24
1995-08-15
Marcelo, Melvin
Multiplex communications
Wide area network
Packet switching
370 19, 370 21, 375205, H04K 100
Patent
active
054426278
ABSTRACT:
A method and apparatus for decoding an orthogonally encoded data signal in a noncoherent receiver system. The method is referred to as dual-maxima metric generation. It comprises the steps of sequentially searching for a maximum energy level in each of two subsets of a given set of symbol indexes and associated energy levels and calculating a difference of the two values to form a soft decision output value. The two subsets are identified by the binary value (either "0" or "1") of a given digit of the binary equivalent of the symbol index. The soft decision output value reflects a measure of confidence of the value of the corresponding digit of the original signal. The dual-maxima generator sequences through the steps one time for each binary digit of the original signal. The method allows the correlated energy from multiple receivers to be combined before the decoding of the signals, thus further reducing the complexity of the circuitry and improving the performance of the decoder.
REFERENCES:
patent: 3678204 (1972-07-01), Harmuth
patent: 4494228 (1985-01-01), Gutleber
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5159608 (1992-10-01), Falconer et al.
patent: 5204874 (1993-04-01), Falconer et al.
patent: 5204876 (1993-04-01), Bruckert et al.
patent: 5305349 (1994-04-01), Dent
Globecom '91 publication vol. 2 of 3 entitled "Performance of a CDMA Radio Communications System with Feed-Back Power Control and Multipath Dispersion" by Chang et al; published Dec. 1991; pp. 1017-1021.
1990 IEEE Military Communications Conference publication vol. 3 of 3 entitled "Performance of a RAKE Demodulator with Pre-decision Multipath Thresholding" by Kane et al; published Oct. 1990; pp. 11025-11029.
Viterbi Andrew J.
Viterbi Audrey
Marcelo Melvin
Miller Russell B.
Ogrod Gregory D.
Qualcomm Incorporated
Vu Huy D.
LandOfFree
Noncoherent receiver employing a dual-maxima metric generation p does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Noncoherent receiver employing a dual-maxima metric generation p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noncoherent receiver employing a dual-maxima metric generation p will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2188384