Distributed closed-loop spatial multiplexing for uplink multiuser systems

Youngwook Ko, Cihan Tepedelenlioglu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Focusing on the uplink, where mobile users (each with a single transmit antenna) communicate with a base station with multiple antennas, we treat multiple users as antennas to enable spatial multiplexing across users. Introducing distributed closed-loop spatial multiplexing with threshold-based user selection, we propose two uplink channel-assigning strategies with limited feedback. We prove that the proposed system also outperforms the standard greedy scheme with respect to the degree of fairness, measured by the variance of the time averaged throughput. For uplink multi-antenna systems, we show that the proposed scheduling is a better choice than the greedy scheme in terms of the average BER, feedback complexity, and fairness. The numerical results corroborate our findings.

Original languageEnglish (US)
Article number4450811
Pages (from-to)470-474
Number of pages5
JournalIEEE Transactions on Wireless Communications
Issue number2
StatePublished - Feb 2008


  • Adaptive modulation
  • Fairness
  • Multi-antenna systems
  • Multiuser systems
  • Scheduling
  • Spatial multiplexing
  • Substream selection
  • Uplink

ASJC Scopus subject areas

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


Dive into the research topics of 'Distributed closed-loop spatial multiplexing for uplink multiuser systems'. Together they form a unique fingerprint.

Cite this