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Downlink beamforming with delayed channel estimates under total power, element power and equivalent isotropic radiated power (EIRP) constraints

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

  • P Zetterberg
  • M Bengtsson
  • DP Mcnamara
  • PB Karlsson
  • MA Beach
Original languageEnglish
Title of host publicationIEEE VTC
Publisher or commissioning bodyInstitute of Electrical and Electronics Engineers (IEEE)
Pages516 - 520
StatePublished - Sep 2001
Event54th Vehicular Technology Conference 2001 (VTC 2001-Fall) - Atlantic City, United States

Publication series

ISSN (Print)10903038


Conference54th Vehicular Technology Conference 2001 (VTC 2001-Fall)
CountryUnited States
CityAtlantic City
Period1/10/01 → …


A WLAN-type scenario where a base-station (access point) equipped with multiple antennas is transmitting and a mobile with only a single antenna is receiving, is considered. Three approaches are investigated: grid-of-beams (GOB), maximal-ratio (MR) and equal-gain (EG), each with one of the following constraints 1) total transmit power over all antenna elements, 2) maximum power on any antenna element 3) equivalent isotropic radiated power (EIRP). The median diversity gain for the MR approach is estimated to be 14.8 dB, 10.6 dB, and 11.4 dB using constraint 1-3, respectively at 5.2 GHz in a modern university building at 5-50 meter range. For GOB corresponding numbers are 9.4 dB, 9.4 dB, 2.3 dB and for EG 13.9 dB, 13.9 dB, 10.3 dB, respectively. These results are virtually independent of delay between channel estimation and use of the same estimate, when the delay is less than 130 ms. This result is obtained although there were people moving in the environment. The diversity gain under the EIRP constraint is encouraging and shows that coverage improvements are possible even under EIRP limitations.

Additional information

Other: Proceedings Rose publication type: Conference contribution Sponsorship: This report is a part of the work done within the EU IST-SATURN project Terms of use: Copyright © 2001 IEEE. Reprinted from Proceedings of IEEE Vehicular Technology Conference, Fall 2001. 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

  • wireless LAN


54th Vehicular Technology Conference 2001 (VTC 2001-Fall)

Duration1 Oct 2001 → …
CityAtlantic City
CountryUnited States

Event: Conference

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