Downlink throughput maximization for interference limited multiuser systems: TDMA versus CDMA

Changyoon Oh, Aylin Yener

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    We consider the downlink throughput maximization problem for interference limited multiuser systems. Our goal is to characterize the optimum base station transmission strategy, i.e., whether the base station transmits to one-user (TDMA) or multiple users (CDMA). Specifically, we aim at determining the optimum number of users to be scheduled and finding the corresponding power allocation. We model the interference by the aid of the orthogonality factor, and determine the throughput maximizing transmission strategy for a range of the values of the orthogonality factor, and the channel gains, subject to a total power constraint. Although the resulting optimization problem may turn out to be non-convex, we show that valuable observations regarding the structure of the optimum solution can be obtained by examining the performance metric from an individual user's point of view. We propose an exact and a near-exact algorithm to determine whether one-user-transmission is the optimum strategy, or more than one user should be transmitted to. Numerical results to support our analysis, as well as the modifications to the proposed algorithms in the presence of individual power constraints are presented.

    Original languageEnglish (US)
    Pages (from-to)2454-2463
    Number of pages10
    JournalIEEE Transactions on Wireless Communications
    Volume6
    Issue number7
    DOIs
    StatePublished - Jul 1 2007

    Fingerprint

    Time division multiple access
    Code Division multiple Access
    Code division multiple access
    Throughput
    Interference
    Base stations
    Orthogonality
    Power Allocation
    Performance Metrics
    Exact Algorithms
    Optimization Problem
    Numerical Results
    Range of data
    Strategy

    All Science Journal Classification (ASJC) codes

    • Computer Science Applications
    • Electrical and Electronic Engineering
    • Applied Mathematics

    Cite this

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    abstract = "We consider the downlink throughput maximization problem for interference limited multiuser systems. Our goal is to characterize the optimum base station transmission strategy, i.e., whether the base station transmits to one-user (TDMA) or multiple users (CDMA). Specifically, we aim at determining the optimum number of users to be scheduled and finding the corresponding power allocation. We model the interference by the aid of the orthogonality factor, and determine the throughput maximizing transmission strategy for a range of the values of the orthogonality factor, and the channel gains, subject to a total power constraint. Although the resulting optimization problem may turn out to be non-convex, we show that valuable observations regarding the structure of the optimum solution can be obtained by examining the performance metric from an individual user's point of view. We propose an exact and a near-exact algorithm to determine whether one-user-transmission is the optimum strategy, or more than one user should be transmitted to. Numerical results to support our analysis, as well as the modifications to the proposed algorithms in the presence of individual power constraints are presented.",
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    Downlink throughput maximization for interference limited multiuser systems : TDMA versus CDMA. / Oh, Changyoon; Yener, Aylin.

    In: IEEE Transactions on Wireless Communications, Vol. 6, No. 7, 01.07.2007, p. 2454-2463.

    Research output: Contribution to journalArticle

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