Performance analysis of scheduling in multiuser MIMO systems with zero-forcing receivers

Chiung Jang Chen*, Li-Chun Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

94 Scopus citations

Abstract

Despite its low-complexity, the zero-forcing receiver is known to suffer from noise enhancement to restore the spatially multiplexed data in a single-user MIMO system. Nevertheless, in the multiuser system, the poor-channel avoidance property of the scheduling technique provides a natural way to overcome the drawback of noise enhancement [20]. In this paper, we present an analytical framework to evaluate the performance of the zero-forcing receiver operating in the multiuser MIMO system with user scheduling. Using the order statistics technique, we derive closed-form expressions for the sum-rate capacity of the multiuser MIMO system that employs the simple spatial multiplexing at the transmitter and zero-forcing processing at the receiver with a number of scheduling algorithms. These closed-form expressions hold for an arbitrary finite number of users and facilitate efficient numerical evaluations for cases of practical interest. In addition, the tractable analysis provides insight into how the scheduling technique affects the performance of the multiuser MIMO system under scalar feedback and vector feedback. The results are also extended to the case of heterogenous users with unequal average SNR.

Original languageEnglish
Pages (from-to)1435-1445
Number of pages11
JournalIEEE Journal on Selected Areas in Communications
Volume25
Issue number7
DOIs
StatePublished - 1 Sep 2007

Keywords

  • Cross-layer cooperation
  • Fading channels
  • MIMO systems
  • Scheduling
  • Zero-forcing receiver

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