Optimal Design of Random Unitary Beamforming for Energy Efficiency in MIMO Broadcast Channels

Random unitary beamforming (RUB) achieves multiuser diversity gain over multiple-input multiple-output broadcast channels with partial channel state information (CSI). RUB can asymptotically achieve the same growth of rate M log log K as the optimal dirty paper coding or sub-optimal zero-forcing bea...

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Bibliographic Details
Published in:IEEE access 2017-01, Vol.5, p.12865-12877
Main Authors: Kwon, Jae-Hong, Ko, Young-Chai, Nam, Sung Sik
Format: Article
Language:English
Subjects:
Array signal processing
Beamforming
Channels
Energy efficiency
Interference
joint optimization
MIMO
MIMO (control systems)
Optimization
power control
Probability density function
Random unitary beamforming
Signal to noise ratio
Streams
Transmitters
Upper bound
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Summary:Random unitary beamforming (RUB) achieves multiuser diversity gain over multiple-input multiple-output broadcast channels with partial channel state information (CSI). RUB can asymptotically achieve the same growth of rate M log log K as the optimal dirty paper coding or sub-optimal zero-forcing beamforming, which need full CSI at the transmitter. In this paper, we propose energy efficient RUB systems that select the optimal number of streams and transmission power to maximize energy efficiency (EE). In contrast to other beamforming schemes that use full CSI, optimizing RUB in terms of EE is a difficult task due to the CSI constraints. To solve this problem, we first select the EE-optimal number of streams and transmission power by using the statistical characteristics of RUB, which have been studied in previous works. Next, based on partial CSI feedback from users, we propose the method whereby the transmitter of RUB can adaptively control the transmission power. Simulation results demonstrate that our proposed systems can improve the EE performance of RUB and that the analytical results derived in this paper are accurate.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2017.2723078