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

P Zetterberg; M Bengtsson; DP Mcnamara; PB Karlsson; MA Beach

doi:10.1109/VTC.2001.956654

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

P Zetterberg, M Bengtsson, DP Mcnamara, PB Karlsson, MA Beach

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

9 Citations (Scopus)

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Abstract

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.

Translated title of the contribution	Downlink beamforming with delayed channel estimates under total power, element power and equivalent isotropic radiated power (EIRP) constraints
Original language	English
Title of host publication	IEEE VTC
Publisher	Institute of Electrical and Electronics Engineers (IEEE)
Pages	516 - 520
Volume	1
DOIs	https://doi.org/10.1109/VTC.2001.956654
Publication status	Published - Sept 2001
Event	54th Vehicular Technology Conference 2001 (VTC 2001-Fall) - Atlantic City, United States Duration: 1 Oct 2001 → …

Publication series

Name
ISSN (Print)	10903038

Conference

Conference	54th Vehicular Technology Conference 2001 (VTC 2001-Fall)
Country/Territory	United States
City	Atlantic City
Period	1/10/01 → …

Bibliographical note

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 [email protected].

By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

Keywords

wireless LAN

Access to Document

10.1109/VTC.2001.956654

Zetterberg IEEE VTC Fall2001Accepted author manuscript, 527 KB

http://hdl.handle.net/1983/269

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Cite this

@inproceedings{b22c1937f8dc42b2b56e7fbb3c818cbf,

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

abstract = "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.",

keywords = "wireless LAN",

author = "P Zetterberg and M Bengtsson and DP Mcnamara and PB Karlsson and MA Beach",

note = "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 {\textcopyright} 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 [email protected]. By choosing to view this document, you agree to all provisions of the copyright laws protecting it. ; 54th Vehicular Technology Conference 2001 (VTC 2001-Fall) ; Conference date: 01-10-2001",

year = "2001",

month = sep,

doi = "10.1109/VTC.2001.956654",

language = "English",

volume = "1",

publisher = "Institute of Electrical and Electronics Engineers (IEEE)",

pages = "516 -- 520",

booktitle = "IEEE VTC",

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Zetterberg, P, Bengtsson, M, Mcnamara, DP, Karlsson, PB & Beach, MA 2001, Downlink beamforming with delayed channel estimates under total power, element power and equivalent isotropic radiated power (EIRP) constraints. in IEEE VTC. vol. 1, Institute of Electrical and Electronics Engineers (IEEE), pp. 516 - 520, 54th Vehicular Technology Conference 2001 (VTC 2001-Fall), Atlantic City, United States, 1/10/01. https://doi.org/10.1109/VTC.2001.956654

Downlink beamforming with delayed channel estimates under total power, element power and equivalent isotropic radiated power (EIRP) constraints. / Zetterberg, P; Bengtsson, M; Mcnamara, DP et al.
IEEE VTC. Vol. 1 Institute of Electrical and Electronics Engineers (IEEE), 2001. p. 516 - 520.

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

TY - GEN

T1 - Downlink beamforming with delayed channel estimates under total power, element power and equivalent isotropic radiated power (EIRP) constraints

AU - Zetterberg, P

AU - Bengtsson, M

AU - Mcnamara, DP

AU - Karlsson, PB

AU - Beach, MA

N1 - 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 [email protected]. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

PY - 2001/9

Y1 - 2001/9

N2 - 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.

AB - 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.

KW - wireless LAN

U2 - 10.1109/VTC.2001.956654

DO - 10.1109/VTC.2001.956654

M3 - Conference Contribution (Conference Proceeding)

VL - 1

SP - 516

EP - 520

BT - IEEE VTC

PB - Institute of Electrical and Electronics Engineers (IEEE)

T2 - 54th Vehicular Technology Conference 2001 (VTC 2001-Fall)

Y2 - 1 October 2001

ER -

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

Abstract

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Bibliographical note

Keywords

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