Regularized Zero‐Forcing Beam Design under Time‐Varying Channels

In this paper, an efficient beam tracking algorithm for a regularized zero‐forcing (RZF) approach in slowly fading multiple‐input and single‐output (MISO) broadcast channels is considered. By modifying an RZF equation, an RZF beam tracking algorithm is proposed using matrix perturbation theory. The...

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Bibliographic Details
Published in:ETRI journal 2016, 38(3), , pp.435-443
Main Authors: Yu, Heejung, Kim, Taejoon
Format: Article
Language:English
Subjects:
matrix perturbation
MISO broadcast channels
RZF beamforming
tracking algorithm
전자/정보통신공학
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Summary:In this paper, an efficient beam tracking algorithm for a regularized zero‐forcing (RZF) approach in slowly fading multiple‐input and single‐output (MISO) broadcast channels is considered. By modifying an RZF equation, an RZF beam tracking algorithm is proposed using matrix perturbation theory. The proposed algorithm utilizes both beams from the previous time step and channel difference (between the previous and current time steps) to calculate the RZF beams. The tracking performance of the proposed algorithm is analyzed in terms of the mean square error (MSE) between a tracking approach and an exact recomputing approach, and in terms of the additional MSE caused by the beam tracking error at the receiver. Numerical results show that the proposed algorithm has almost the same performance as the exact recomputing approach in terms of the sum rate.
ISSN:1225-6463
2233-7326
DOI:10.4218/etrij.16.0115.0753