NDLI: Multiuser transmit optimization for multicarrier broadcast channels: asymptotic FDMA capacity region and algorithms

Content Provider	IEEE Xplore Digital Library
Author	Hoo, L.M.C. Halder, B. Tellado, J. Cioffi, J.M.
Copyright Year	1972
Abstract	We derive optimal and suboptimal multiuser transmit-optimization methods for a multicarrier broadcast channel with intersymbol interference under the frequency-division multiple-access (FDMA) restriction. The general FDMA-based multicarrier broadcast problem is formulated as a maximum weighted rate-sum problem. Given each user's subchannel assignment, the optimal transmit strategy is achieved by multilevel waterfilling. Unfortunately, the problem of finding the optimal subchannel assignments is combinatorial. However, by relaxing the FDMA restriction, we obtain a convex reformulation that allows for efficient computation of the optimal solution, and therefore, a characterization of the FDMA capacity region for a broadcast channel. If all users share the same transmission medium, we prove that the optimal frequency partitioning among the users has an ordered structure that can be exploited to significantly reduce the computational complexity. To make multiuser transmit-optimization schemes practical for applications with relatively fast time-varying user data-rate requirements or priorities, further reduction in computational complexity is necessary. This is achieved by restricting the energy distribution to be constant across the used subchannels. Simulations indicate the low-complexity constant-energy methods presented are very robust, and suffer from negligible performance loss.
Starting Page	922
Ending Page	930
Page Count	9
File Size	409231
File Format	PDF
ISSN	00906778
Volume Number	52
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Broadcasting Frequency division multiaccess Channel capacity Intersymbol interference Bandwidth Computational complexity Frequency division multiplexing OFDM Wireless communication Feedback
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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