Blind CFOs Estimation by Capon Method for Multi-User MIMO-OFDMA Uplink System

Singh, S and Kumar, S and Majhi, S and Satija, U (2024) Blind CFOs Estimation by Capon Method for Multi-User MIMO-OFDMA Uplink System. In: IEEE Signal Processing Letters, 31 . pp. 2545-2549.

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Abstract

This letter presents a blind carrier frequency offset (CFO) estimator for multi-user multiple input multiple outputorthogonal frequency division multiple access (MIMO-OFDMA) uplink system by Capon method using covariance matrix decomposition in the presence of Rayleigh fading channel. In this method, a covariance matrix is derived from the received signal, followed by QR factorization of the covariance matrix to get the upper triangular matrix. Then, a cost function is formulated by calculating the inverse of the upper triangular matrix. The proposed estimator does not require channel state information or any pilot symbols, which makes the system spectrum efficient. The exact Cramer Rao lower bound is also derived, establishing a lower limit for the mean squared error of the proposed estimator. Simulation results indicate that our proposed method outperforms existing methods. The proposed method also provides a lower computational complexity. © 1994-2012 IEEE.

Item Type:	Journal Article
Publication:	IEEE Signal Processing Letters
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Publisher.
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	01 Oct 2024 10:44
Last Modified:	01 Oct 2024 10:44
URI:	http://eprints.iisc.ac.in/id/eprint/86365

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