Asymptotically optimal power control policies for MMSE multiuser detector

Zvi Rosberg

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Asymptotically optimal uplink transmission power control policies are derived for synchronous and asynchronous CDMA time varying fading channels with multiple user classes, random spreading sequences and MMSE multiuser detector. One optimal policy minimizes the outage probability subject to maximum average power budget and maximum transmission power constraints. Another minimizes the average power budget subject to maximum outage probability and maximum transmission power constraints. If the channel states are available, we show that both optimal policies are channel inversion threshold cut-off policies and express them explicitly. When channel states are estimated, we show how to transform the optimal policies into estimator-based policies while controlling the degradation of their performance measures . Finally, we compare between the performance of the optimal policies and other policies in an environment with Lognormal and Rayleigh fading.

Original languageEnglish
Pages (from-to)105-117
Number of pages13
JournalWireless Networks
Volume12
Issue number1
DOIs
StatePublished - 1 Feb 2006

Keywords

  • CDMA
  • Fading channels
  • MMSE multiuser detector
  • Outage probability
  • Power control
  • Random spreading sequence

ASJC Scopus subject areas

  • Information Systems
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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