IEICE Communications Express
Online ISSN : 2187-0136
ISSN-L : 2187-0136
Parameter estimation refinement of MIMO propagation channel by nonlinear conjugate gradient approach
Kentaro SaitoYunyi YaoJun-ichi Takada
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2018 Volume 7 Issue 9 Pages 328-333


Nowadays, multiple-input multiple-output (MIMO) transmission becomes an essential technology for wireless communication systems. Because the MIMO transmission performance heavily depends on the propagation channel characteristics, those channel parameters have been investigated through various radio measurements. In this paper, we propose a parameter estimation refinement method based on the nonlinear conjugate gradient (NLCG) approach. In our proposal, the accurate propagation parameters are obtained with a few iterations without falling into the local maximum points of the likelihood function. The proposed method was evaluated through a computer simulation, and the results showed that the residual signal power ratio (RSPR) of the channel reconstructed was improved by approximately 17% compared with the space-alternating generalized expectation-maximization (SAGE) algorithm. The proposed method is expected to be utilized for channel measurements in the future work.

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© 2018 The Institute of Electronics, Information and Communication Engineers
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