NDLI: Generalized square and hexagonal constellations for intersymbol-interference channels with generalized Tomlinson-Harashima precoders

Content Provider	IEEE Xplore Digital Library
Author	Lee-Fang Wei
Copyright Year	1972
Abstract	For channels with severe amplitude distortion such as high-speed digital subscriber loops, using a Tomlinson-Harashima (TH) precoder in the transmitter has the same intersymbol-interference-elimination and noise-suppression advantages as using a decision feedback equalizer in the receiver, but without its disadvantage of error propagation. TH precoders have a further advantage of interworking easily with coded modulation techniques. Square constellations are generally preferred in systems using conventional TH precoders. The choice for the size of square constellations is, however, limited. The authors widen that choice by designing new families of generalized square and hexagonal constellations together with their matched generalized TH precoders. The design of the constellation and TH precoder is closely related to the design. Using a generalized TH precoder also results in a smaller peak-to-average power ratio of the transmitted signal than that for conventional TH precoders. Simple modifications of Viterbi decoders required by the use of TH precoders are also discussed.<>
Starting Page	2713
Ending Page	2721
Page Count	9
File Size	927651
File Format	PDF
ISSN	00906778
Volume Number	42
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Decision feedback equalizers Modulation coding Transmitters Quadrature amplitude modulation AWGN DSL Noise level Viterbi algorithm Decoding Transceivers
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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