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 publicationIEEE Vehicular Technology Conference
DOIs
Publication statusPublished - 2011
Event2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Budapest, Hungary
Duration: 2011 May 152011 May 18

Other

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

Fingerprint

Orthogonalization
Multiple-input multiple-output (MIMO) Systems
Beamforming
Space division multiple access
Broadcast Channel
Multiple Access
Multiple-input multiple-output (MIMO)
Division
Feedback
Limited Feedback
Multiplexing
Base stations
High Throughput
Latency
Throughput

ASJC Scopus subject areas

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

Cite this

Orthogonal beamforming using gram-Schmidt orthogonalization for multi-user MIMO downlink system. / Matsumura, Kunitaka; Ohtsuki, Tomoaki.

IEEE Vehicular Technology Conference. 2011. 5956775.

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

Matsumura, K & Ohtsuki, T 2011, Orthogonal beamforming using gram-Schmidt orthogonalization for multi-user MIMO downlink system. in IEEE Vehicular Technology Conference., 5956775, 2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring, Budapest, Hungary, 11/5/15. https://doi.org/10.1109/VETECS.2011.5956775
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