Design of Dirty Paper Codes for Wireless Broadcast Channels
Date Issued
2004-07-31
Date
2004-07-31
Author(s)
DOI
922213E002078
Abstract
“Writing on Dirty Paper” is a paper written by M.
Costa in 1983 that dealt with the channel capacity when the
interference is known only to the transmitter. The conclusion of that
paper was that when one wants to write a message on a dirty paper,
because the dirt spots are known, one could find a special way to
write and convey the message as if the message was written on a
clean paper. In information-theoretic terminology, the capacity of a
channel with interference known to the transmitter is the same as the
clean channel capacity.
Recently, with the new developments in applications such as
high speed downlink broadcast (for wireless systems, as well as for
digital subscriber lines) and multi-media information hiding and
watermarking, there has been a resurgence of interest in Costa’s
“Dirty Paper Coding (DPC)”. The general view is that DPC allows
interference cancellation at transmitter which resembles decisionfeedback
detection at receiver. Thus, conventional detection
techniques at receiver can be moved to the transmitter if interference
and channel side information are known to it. The advantages of
doing so are prevention of error propagation in detection and, in the
case of practical downlink broadcast, relieving the mobile receivers
of complicated detection.
Practical approaches to the design of DPC, however, were not
available until 2000 when Erez, Shamai and Zamir established the
connection between DPC and Tomlinson-Harashima precoding
(THP) for channels with intersymbol interference. In their work,
Erez et al showed that there is a “shaping loss” in capacity
associated with the conventional THP approach. To recover the
shaping loss, higher dimensional equivalent of the THP can be used,
but the coding complexity is usually high. In addition, THP applies
only to cubic constellations which incur a further shaping loss. In
this paper, we consider the design of DPC for wireless broadcast
channels. In order to reduce the high dimensional precoding and
shaping complexity, Eyuboglu and Forney’s trellis precoding and
shaping approach will be adopted. It will be shown that combined
trellis DPC and shaping is feasible and indeed retains the clean
channel performance.
Subjects
Dirty paper coding
Tomlinson-Harashima
precoding
precoding
equalization
broadcast channel
information
hiding
hiding
watermarking
Publisher
臺北市：國立臺灣大學電信工程學研究所
Type
report
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