NDLI: Six-dimensional trellis-coding with QAM signal sets

Content Provider	IEEE Xplore Digital Library
Author	Chouly, A. Sari, H.
Copyright Year	1972
Abstract	A family of 6-D trellis-coded modulation (TCM) schemes which involve a 2-step partitioning of the constituent QAM signal alphabet is presented. With infinite constellations without shaping, the asymptotic coding gain is 3 dB for the 2-state code, 4 dB for the 4- and 8-state codes, and 5 dB for the 16- and 32-state codes which involve a smaller alphabet expansion. The authors also describe a rotationally invariant 16-state code that achieves the same asymptotic gain as its linear counterpart. Practical signal constellations are described for 6-D TCM with the spectral efficiency of uncoded 64-QAM, and the performance of these schemes is studied by means of computer simulations. It was found that they achieve an additional coding gain of 0.2-0.3 dB over infinite hypercube-type constellations. The performance of the presented schemes at practical signal-to-noise ratio values is evaluated using transfer function techniques.<>
Starting Page	24
Ending Page	33
Page Count	10
File Size	1023068
File Format	PDF
ISSN	00906778
Volume Number	40
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1992-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quadrature amplitude modulation Constellation diagram Convolutional codes Gain Multidimensional systems Signal to noise ratio Linear code Transfer functions Two dimensional displays Phase shift keying
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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