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Random beamforming OFDMA for future generation cellular communication systems

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)516 - 520
Number of pages5
JournalIEEE 66th Vehicular Technology Conference, VTC-2007 Fall
StatePublished - 30 Sep 2007
Event66th Vehicular Technology Conference 2007 (VTC 2007-Fall) - Baltimore, MD, United States


This paper presents a downlink performance analysis of a Layered Random Beamforming (LRB) - MIMO-OFDMA Physical Layer (PHY) as applicable to future generation wireless communication systems. OFDMA is a popular multiple access candidate for future generation cellular communication systems which facilitates multi-user diversity by enabling multiple access in the frequency domain. Random Beamforming (RB) is a method which enables the exploitation of spatial multi-user diversity gain and a spatial multiplexing capacity gain. Unlike a conventional beamforming system, an RB system only requires effective signal to noise ratios (ESNR) as feedback and thus has potentially much lower feedback requirements than a system which requires feedback of more detailed channel information. The Layered method (LRB) enables the spatial multiplex of data transmitted simultaneously to different destinations. As a result it is able to offer a further spatial multi-user diversity gain, referred to here as layer multi-user diversity gain to distinguish from that achieved by the RB technique. An LRB-OFDMA system is thus able to achieve the rich benefits of spatial multiplexing capacity gain in combination with spatial, layer and spectral multi-user diversity gains. In this paper, the design of both RB-OFDMA and LRB-OFDMA systems are proposed and the performance of the system is evaluated by software simulation using various statistical channel models.

Additional information

Publisher: Institute of Electrical and Electronics Engineers, Inc. (IEEE) Name and Venue of Conference: IEEE 66th Vehicular Technology Conference, VTC-2007 Fall, Baltimore Rose publication type: Conference contribution Additional information: With accompanying conference presentation Sponsorship: The authors wish to acknowledge the financial support of Dorothy Hodgkin Postgraduate Awards (DHPA) and Toshiba Research Europe Limited (TREL) and to thank Dr. Magnus Sandell of TREL and Dr. Matthew Webb of University of Bristol for their technical input. Terms of use: Copyright © 2007 IEEE. Reprinted from IEEE 66th Vehicular Technology Conference, Fall 2007. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

    Research areas

  • Layered Random Beamforming (LRB), OFDMA


66th Vehicular Technology Conference 2007 (VTC 2007-Fall)

Duration30 Sep 2007 → …
CityBaltimore, MD
CountryUnited States

Event: Conference

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