Opportunistic Beamforming Using Dumb Antennas

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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:	810 - 1 self

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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