Asymptotically optimal transmission power and rate control for CDMA channels with multiple user classes

Zvi Rosberg

    Research output: Contribution to journalConference articlepeer-review

    1 Scopus citations

    Abstract

    An asymptotically combined optimal transmission power and rate control policy is derived for a DS-CDMA time varying fading channel with multiple user classes, random spreading codes and a linear MMSE multiuser detector. The rigorous optimization problem is presented as a non-convex constrained program explicitly solved in a closed-form given by a function of a single Lagrangian multiplier. The optimal multiplier is derived by a low number of independent bisection searches for a zero, where each search is done in a single-valued function. The optimal control policy is demonstrated by an application, where the transmission power is adapted to the channel fade variations, and the transmission rates are adapted to the tier in which the mobile is located. The effect of the number of tiers on the optimal transmission rate is presented in an environment with Lognormal and Rayleigh fading.

    Original languageEnglish
    Pages (from-to)79-89
    Number of pages11
    JournalProceedings - IEEE INFOCOM
    Volume1
    StatePublished - 10 Oct 2005
    EventIEEE INFOCOM 2005 - Miami, FL, United States
    Duration: 13 Mar 200517 Mar 2005

    Keywords

    • Adaptive rate transmission
    • CDMA
    • Fading channels
    • MMSE multiuser receiver
    • Matched filter receiver
    • Outage probability
    • Random spreading codes
    • Transmission power control
    • Transmission rate control

    ASJC Scopus subject areas

    • General Computer Science
    • Electrical and Electronic Engineering

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