Scheduling algorithm with power allocation for random unitary beamforming

Yuki Tsuchiya, Tomoaki Ohtsuki, Toshinobu Kaneko

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Random unitary beamforming is one of the schemes that can reduce the amount of feedback information in multiuser diversity techniques with multiple-antenna downlink transmission. In Multiple-Input Multiple-Output (MIMO) systems, throughput performance is greatly improved using AMC (Adaptive Modulation and Coding). Throughput performance is also improved by allocating power among streams appropriately. In random unitary beamforming, the transmitter has only partial channel state information (CSI) of each receiver. Thus, it is difficult for random unitary beamforming to use conventional power allocation methods that assumes that all receivers has full CSI. In this paper, we propose a new scheduling algorithm with power allocation for downlink random unitary beamforming that improves throughput performance without full CSI. We provide numerical results of the proposed scheduling algorithm and compare them to those of the conventional random unitary beamforming scheduling algorithm. We show that random unitary beamforming achieves the best system throughput performance with two transmit antennas. We also show that the proposed algorithm attains higher throughput with the small increase of feedback than the random unitary beamforming scheduling algorithm.

Original languageEnglish
Pages (from-to)232-238
Number of pages7
JournalIEICE Transactions on Communications
VolumeE91-B
Issue number1
DOIs
Publication statusPublished - 2008

Fingerprint

Beamforming
Scheduling algorithms
Throughput
Channel state information
Antennas
Feedback
Adaptive modulation
Transmitters

Keywords

  • AMC
  • MIMO
  • Power allocation
  • Random beamforming

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Software

Cite this

Scheduling algorithm with power allocation for random unitary beamforming. / Tsuchiya, Yuki; Ohtsuki, Tomoaki; Kaneko, Toshinobu.

In: IEICE Transactions on Communications, Vol. E91-B, No. 1, 2008, p. 232-238.

Research output: Contribution to journalArticle

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