Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1996-09-09
1998-12-08
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375265, 371 43, H04L 512
Patent
active
058481028
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: 4562425 (1985-12-01), Turner et al.
patent: 4755988 (1988-07-01), Gallager
patent: 4805174 (1989-02-01), Kubota
patent: 4939555 (1990-07-01), Calderbank
patent: 5233629 (1993-08-01), Paik et al.
patent: 5363408 (1994-11-01), Paik et al.
patent: 5418798 (1995-05-01), Wei
Biglieri et al., "Introduction to Trellis-Coded Modulation with Applications", Macmillan Publishing pp. 149-150, 502-503, Jan. 1991.
Wang et al "Coded QAM using a binary Convolutisal Code" Milcom '90: A New Era. 1990 pp. 126-130.
3. Bibb Cain et al, "Punctured Convolutional Codes of Rate (N-1)/N and Simplified Max Likelihood Decoding," IEEE Trans. on Information Theory vol. IT-25 No. 1 Jan. 1979 pp. 97-100.
Wang, Q et al, "Coded QAM using a binary convolutional code," MILCOM 90. A New Era. 1990 IEEE Military Communications Conf. Conf. Record pp. 126-130.
Wolf Jack Keil
Zehavi Ephraim
Chin Stephen
English Sean
Miller Russell B.
Qualcomm Incorporated
Webster Bryan
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-186199