Patent
Distributed trellis encoder
William L. Betts,Kenneth Martinez,Gordon Bremer +2 more
- 01 Mar 1985
63
TL;DR: In this paper, the output of each encoder is modulated using QAM to generate sequential baud signal elements, and the redundant data bits generated are distributed between several non-consecutive bauds.
read more
Abstract: In the transmitter of a data communication system using QAM, a plurality of trellis coders with delay units are used for forward error correction. The output of each encoder is modulated using QAM to generate sequential baud signal elements. The redundant data bits generated are distributed between several non-consecutive bauds. Likewise, at the receiver a plurality of distributed convolutional decoders are utilized to decode the received signal element. The distributed trellis decoder is self-synchronizing.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Patent
Error-correction coding method with at least two systematic convolutional codings in parallel, corresponding iterative decoding method, decoding module and decoder
Claude Berrou
- 16 Apr 1992
TL;DR: In this article, an error correction method for the coding of source digital data elements to be transmitted or broadcast, notably in the presence of high transmission noise, was proposed, the method comprising at least two independent steps of systematic convolutional coding, each of the coding steps taking account of all of the source data elements, and a corresponding iterative decoding method using, for the decoding, at each iteration, an intermediate data element obtained by the combination of the received data element with a data element estimated during the previous iteration.
259
Patent
Multiple vocoder mobile satellite telephone system
Robert A. Wiedeman
- 23 Dec 1998
TL;DR: In this article, the encoder/decoder or vocoder selection is made in the gateway based on one or more criterion such as a presence of an RF signal impairment or RF interference, a predicted and/or actual communications system, a user-selected voice quality, and a signal quality received from the user terminal.
254
Patent
Multicarrier modulation transmission system with variable delay
John M. Cioffi,Po Tong,James T. Aslanis,Antoinette H. Gooch +3 more
- 17 Aug 1993
TL;DR: In this paper, a transmission system using multicarrier modulation applies FECC (forward error correcting code) coding and codeword interleaving differently to input signals from a plurality of different data channels to produce encoded data signals having different reliabilities and different coding delays.
172
Patent
Qam system in which the constellation is modified in accordance with channel quality
William Webb
- 02 Jun 1992
TL;DR: In this paper, a radio system is designed as to allow each of a pair of transceivers to assess the quality of the link and to modify the signal constellation accordingly, and each transceiver monitors the quality by assessing the strength of the received signal, or the bit error rate, or both.
157
Patent
Trellis coded modulation for transmission over fading mobile satellite channel
Marvin K. Simon,Dariush Divasalar +1 more
- 15 Sep 1988
TL;DR: In this article, the combination of trellis coding and MPSK signaling with asymmetry (nonuniform spacing) to the signal set is disclosed with regard to its suitability for a fading mobile satellite communication channel.
References
Patent
Concatenated error correcting system
George D. Doland
- 29 Mar 1979
TL;DR: The error correcting system comprising this invention consists of a Modified Viterbi Decoder concatenated with an Improved Multiple Decoding System as mentioned in this paper, which provides a soft decision quality signal output used by the Improved Multiple Decoder so that the error correcting capabilities of each type decoder are additive yielding net coding gains not heretofore achievable.
40
Patent
Bit serial convolutional decoder for vlsi implementation
Glen D. Rattlingourd,Robert J. Currie,Stanley D. Moss +2 more
- 31 Aug 1983
TL;DR: In this paper, a decoder for forward error-correcting (FEC) convolutional codes using the Viterbi algorithm is presented. But the decoder is not suitable for the implementation on a single monolithic VLSI integrated circuit chip and includes a branch metric calculator circuit which produces output signals representative of input symbol signals.
36
Patent
Decoder for implementing an approximation of the Viterbi algorithm using analog processing techniques
Acampora Anthony
- 19 Apr 1977
TL;DR: In this article, two novel approaches for implementing an approximation of the Viterbi decoding algorithm using analog processing techniques were proposed, which offer the potential for decoding at higher rates than currently achievable with digital processing decoders.
30
Patent
Multi-rate branch metric processor for maximum-likelihood convolutional decoder
Ronald D. Mccallister,James J. Crawford +1 more
- 04 Oct 1982
TL;DR: A branch metric processor for use in a maximum-likelihood convolutional decoder accepts a set of softdecision symbols, an indicator of a level of quantization thereof and erase control signals and generates branch metrics for base code rates of 1/3 and 1/2 as discussed by the authors.
25