Open AccessRegularized Zero‐Forcing Beam Design under Time‐Varying Channels
Author(s) -
Yu Heejung,
Kim Taejoon
Publication year - 2016
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.16.0115.0753
Subject(s) - tracking (education) , tracking error , beam (structure) , algorithm , forcing (mathematics) , fading , channel (broadcasting) , control theory (sociology) , mathematics , perturbation (astronomy) , mean squared error , matrix (chemical analysis) , computer science , engineering , physics , mathematical analysis , telecommunications , statistics , artificial intelligence , psychology , pedagogy , civil engineering , decoding methods , control (management) , quantum mechanics , materials science , composite material
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.