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Opportunistic Beamforming Using Dumb Antennas (2002)

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by Pramod Viswanath , David Tse , Rajiv Laroia
Venue:IEEE Transactions on Information Theory
Citations:807 - 1 self
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BibTeX

@ARTICLE{Viswanath02opportunisticbeamforming,
    author = {Pramod Viswanath and David Tse and Rajiv Laroia},
    title = {Opportunistic Beamforming Using Dumb Antennas},
    journal = {IEEE Transactions on Information Theory},
    year = {2002},
    volume = {48},
    pages = {1277--1294}
}

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Abstract

Multiuser diversity is a form of diversity inherent in a wireless network, provided by independent time-varying channels across the different users. The diversity benefit is exploited by tracking the channel fluctuations of the users and scheduling transmissions to users when their instantaneous channel quality is near the peak. The diversity gain increases with the dynamic range of the fluctuations and is thus limited in environments with little scattering and/or slow fading. In such environments, we propose the use of multiple transmit antennas to induce large and fast channel fluctuations so that multiuser diversity can still be exploited. The scheme can be interpreted as opportunistic beamforming and we show that true beamforming gains can be achieved when there are sufficient users, even though very limited channel feedback is needed. Furthermore, in a cellular system, the scheme plays an additional role of opportunistic nulling of the interference created on users of adjacent cells. We discuss the design implications of implementing this scheme in a complete wireless system.

Keyphrases

opportunistic beamforming using dumb antenna    limited channel feedback    channel fluctuation    little scattering    multiple transmit antenna    diversity benefit    design implication    diversity inherent    opportunistic beamforming    different user    diversity gain increase    wireless network    sufficient user    instantaneous channel quality    opportunistic nulling    dynamic range    cellular system    multiuser diversity    fast channel fluctuation    additional role    true beamforming gain    independent time-varying channel    complete wireless system    adjacent cell   

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