Orthogonal beamforming using gram-Schmidt orthogonalization for multi-user MIMO downlink system

Kunitaka Matsumura, Tomoaki Ohtsuki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Simultaneous transmission to multiple users using orthogonal beamforming, known as space-division multiple-access (SDMA), is capable of achieving very high throughput in multiple-input multiple-output (MIMO) broadcast channel. In this paper, we propose a new orthogonal beamforming algorithm to achieve high capacity performance in MIMO broadcast channel. In the proposed algorithm, the base station generates a unitary beamforming vector set using Gram-Schmidt orthogonalization. We extend the algorithm of LF-OSDMA (Opportunistic SDMA with Limited Feedback) to guarantee that the system never loses multiplexing gain for fair comparison with the proposed algorithm by informing unallocated beams. Finally, we show that the proposed method can achieve a significantly higher sum capacity than LF-OSDMA and the extended LF-OSDMA without a large increase in the amount of feedback bits and latency.

Original languageEnglish
Title of host publication2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Proceedings
DOIs
Publication statusPublished - 2011 Aug 29
Event2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Budapest, Hungary
Duration: 2011 May 152011 May 18

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252

Other

Other2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring
CountryHungary
CityBudapest
Period11/5/1511/5/18

ASJC Scopus subject areas

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

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    Matsumura, K., & Ohtsuki, T. (2011). Orthogonal beamforming using gram-Schmidt orthogonalization for multi-user MIMO downlink system. In 2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Proceedings [5956775] (IEEE Vehicular Technology Conference). https://doi.org/10.1109/VETECS.2011.5956775