Performance improvement of opportunistic beamforming with conservative link adaptation in the presence of channel estimation error

Yohan Kim, Dong Ku Kim

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

1 Citation (Scopus)

Abstract

Opportunistic Beamforming (OBF) offers a way to provide the multiuser diversity in slow fading channel by using randomly generated beam weights, leading to the substantial reduction of the required feedback from users. In spite of the advantage of the reduced feedback, the imperfect channel estimation might influence the quality of the estimated SNR and channel scheduler so bad that the selected AMC level would be higher than the achievable rate of the actual channel, which is called outage. In this paper, we propose a conservative link adaptation, where the estimated SNR is scaled down by a conservative factor which minimizes the variance of the difference between the actual channel SNR and the resultant SNR. Simulation results show that the introduction of conservative factor shows two-fold performance improvement in the presence of channel estmiation error.

Original languageEnglish
Title of host publicationMilitary Communications Conference 2006, MILCOM 2006
DOIs
Publication statusPublished - 2007 Oct 15
EventMilitary Communications Conference 2006, MILCOM 2006 - Washington, D.C., United States
Duration: 2006 Oct 232006 Oct 25

Other

OtherMilitary Communications Conference 2006, MILCOM 2006
CountryUnited States
CityWashington, D.C.
Period06/10/2306/10/25

Fingerprint

Channel estimation
Beamforming
Telecommunication links
Feedback
Outages
Fading channels

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

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title = "Performance improvement of opportunistic beamforming with conservative link adaptation in the presence of channel estimation error",
abstract = "Opportunistic Beamforming (OBF) offers a way to provide the multiuser diversity in slow fading channel by using randomly generated beam weights, leading to the substantial reduction of the required feedback from users. In spite of the advantage of the reduced feedback, the imperfect channel estimation might influence the quality of the estimated SNR and channel scheduler so bad that the selected AMC level would be higher than the achievable rate of the actual channel, which is called outage. In this paper, we propose a conservative link adaptation, where the estimated SNR is scaled down by a conservative factor which minimizes the variance of the difference between the actual channel SNR and the resultant SNR. Simulation results show that the introduction of conservative factor shows two-fold performance improvement in the presence of channel estmiation error.",
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doi = "10.1109/MILCOM.2006.302025",
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Kim, Y & Kim, DK 2007, Performance improvement of opportunistic beamforming with conservative link adaptation in the presence of channel estimation error. in Military Communications Conference 2006, MILCOM 2006., 4086436, Military Communications Conference 2006, MILCOM 2006, Washington, D.C., United States, 06/10/23. https://doi.org/10.1109/MILCOM.2006.302025

Performance improvement of opportunistic beamforming with conservative link adaptation in the presence of channel estimation error. / Kim, Yohan; Kim, Dong Ku.

Military Communications Conference 2006, MILCOM 2006. 2007. 4086436.

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

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