Reduced feedback opportunistic and layered random beamforming for MIMO-OFDMA systems

C Han, M Nicolaou, A Doufexi, SMD Armour

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

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Abstract

This paper considers a number of techniques employed in opportunistic and layered random beamforming OFDMA schemes that aim to reduce the feedback required to perform scheduling whilst also minimising the throughput degradations resulting from this reduced throughput (due to the lack of full CSI at the Base Station (BS). Frequency response correlation among subcarriers can be exploited to group adjacent subcarriers into clusters which can then be treated as a single unit for feedback purposes to reduce the total amount of feedback. Given that these grouped subcarriers are highly correlated, good throughput performance can be preserved. In addition, it is possible to schedule clusters of size greater that 1 with a single feedback bit per cluster, achieving the same rate growth as a full CSI aware scheme. The idea of transmitting multiple weights to increase diversity has also been developed for an OFDM/OFDMA scenario where different clusters pick different weighting vectors for transmission, resulting in an overall throughput increase at the expense of only a minor increase in feedback information.
Translated title of the contributionReduced feedback opportunistic and layered random beamforming for MIMO-OFDMA systems
Original languageEnglish
Title of host publicationIET Seminar on Smart Antennas and Coooperativve Communication, London
PublisherInstitution of Engineering and Technology (IET)
Publication statusPublished - 22 Oct 2007
EventIET Seminar on Smart Antennas and Cooperative Communication - London, United Kingdom
Duration: 22 Oct 2007 → …

Conference

ConferenceIET Seminar on Smart Antennas and Cooperative Communication
CountryUnited Kingdom
CityLondon
Period22/10/07 → …

Bibliographical note

Conference Proceedings/Title of Journal: IET Seminar on Smart Antennas and Coooperativve Communication
Rose publication type: Conference contribution

Additional information: With accompanying conference presentation

Sponsorship: The authors wish to acknowledge the financial support of Toshiba Research Europe Limited (TREL) and DHPA and EPSRC

Terms of use: This is a postprint of a paper submitted to and accepted for publication in IET Seminar on Smart Antennas and Cooperative Communication, and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library

Keywords

  • opportunistic beamforming
  • MIMO-OFDMA
  • frequency correlation
  • multiple weights
  • 1 bit feedback

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  • Cite this

    Han, C., Nicolaou, M., Doufexi, A., & Armour, SMD. (2007). Reduced feedback opportunistic and layered random beamforming for MIMO-OFDMA systems. In IET Seminar on Smart Antennas and Coooperativve Communication, London Institution of Engineering and Technology (IET). http://hdl.handle.net/1983/1781