NDLI: Trellis and convolutional precoding for transmitter-based interference presubtraction

Content Provider	IEEE Xplore Digital Library
Author	Wei Yu Varodayan, D.P. Cioffi, J.M.
Copyright Year	1972
Abstract	This paper studies the combination of practical trellis and convolution codes with Tomlinson-Harashima precoding (THP) for the presubtraction of multiuser interference that is known at the transmitter but not known at the receiver. It is well known that a straightforward application of THP suffers power, modulo, and shaping losses. This paper proposes generalizations of THP that recover some of these losses. At a high signal-to-noise ratio (SNR), the precoding loss is dominated by the shaping loss, which is about 1.53 dB. To recover shaping loss, a trellis-shaping technique is developed that takes into account the knowledge of a noncausal interfering sequence, rather than just the instantaneous interference. At rates of 2 and 3 bits per transmission, trellis shaping is shown to be able to recover almost all of the 1.53-dB shaping loss. At a low SNR, the precoding loss is dominated by power and modulo losses, which can be as large as 3-4 dB. To recover these losses, a technique that incorporates partial interference presubtraction (PIP) within convolutional decoding is developed. At rates of 0.5 and 0.25 bits per transmission, PIP is able to recover 1-1.5 dB of the power loss. For intermediate SNR channels, a combination of the two schemes is shown to recover both power and shaping losses.
Starting Page	1220
Ending Page	1230
Page Count	11
File Size	502389
File Format	PDF
ISSN	00906778
Volume Number	53
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Transmitters Convolutional codes Convolution Propagation losses DSL Broadcasting Gaussian noise Signal to noise ratio Decoding vectored digital subscriber line (DSL) Broadcast channel channels with noncausal side information convolutional codes dirty-paper precoding shaping codes Tomlinson–Harashima precoding (THP) trellis codes trellis precoding (TP) trellis shaping (TS)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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