Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1997-07-16
2000-09-12
Pham, Chi H.
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375265, 371 437, H04L 512, H04L 2302
Patent
active
061188263
ABSTRACT:
A method and apparatus for encoding and decoding QAM trellis modulated data. In the transmitter, a subset of bits of an input bit set are convolutionally encoded based upon a punctured convolutional code of a lower data rate to provide a set of coded symbols. The coded symbols and the uncoded bits of the input bit set are provided to a QAM modulator to provide a QAM modulation signal indicative of the values of coded symbols and the uncoded bits. In the receiver a QAM demodulator converts the received QAM signal to QAM signal space coordinates. A decoder employing the Viterbi algorithm is used to reconstruct a corrected estimate of the values of the coded data bits from the received signal coordinates. The corrected estimate of the values of the coded data bits are then used in conjunction with the received signal coordinates to provide corrected estimates of the values of the uncoded input bits.
REFERENCES:
patent: 5233629 (1993-08-01), Paik et al.
patent: 5511082 (1996-04-01), How et al.
patent: 5633881 (1997-05-01), Zehavi et al.
patent: 5848102 (1998-12-01), Zehavi et al.
Wolf Jack Keil
Zehavi Ephraim
Edmonston Brian S.
English Sean
Miller Russell B.
Pham Chi H.
Qualcomm Incorporated
LandOfFree
Method and apparatus for encoding/decoding QAM trellis coded dat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for encoding/decoding QAM trellis coded dat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for encoding/decoding QAM trellis coded dat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-102880