How to Fully Exploit the Degrees of Freedom in the Downlink of MISO Systems With Opportunistic Beamforming

Details How to Fully Exploit the Degrees of Freedom in the Downlink of MISO Systems With Opportunistic Beamforming How to Fully Exploit the Degrees of Freedom in the Downlink of MISO Systems With Opportunistic Beamforming

2008-09-03

arxiv.org/abs/0809.0536v2

Computer Science

Information Theory

v2, revised Jan. 5, 2009. Few typo and error corrections, better clarification

Scientific paper

The opportunistic beamforming in the downlink of multiple-input single-output (MISO) systems forms $N$ transmit beams, usually, no more than the number of transmit antennas $N_t$. However, the degrees of freedom in this downlink is as large as $N_t^2$. That is, at most $N_t^2$ rather than only $N_t$ users can be simultaneously transmitted and thus the scheduling latency can be significantly reduced. In this paper, we focus on the opportunistic beamforming schemes with $N_t

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