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      Blind Cyclic Prefix-based CFO Estimation in MIMO-OFDM Systems

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          Abstract

          Low-complexity estimation and correction of carrier frequency offset (CFO) are essential in orthogonal frequency division multiplexing (OFDM). In this paper, we propose a low-overhead blind CFO estimation technique based on cyclic prefix (CP), in multi-input multi-output (MIMO)-OFDM systems. We propose to use antenna diversity for CFO estimation. Given that the RF chains for all antenna elements at a communication node share the same clock, the carrier frequency offset (CFO) between two points may be estimated by using the combination of the received signal at all antennas. We improve our method by combining the antenna diversity with time diversity by considering the CP for multiple OFDM symbols. We provide a closed-form expression for CFO estimation and present algorithms that can considerably improve the CFO estimation performance at the expense of a linear increase in computational complexity. We validate the effectiveness of our estimation scheme via extensive numerical analysis.

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          Author and article information

          Journal
          29 August 2023
          Article
          2308.15650
          c34031bf-ec6e-477a-89b7-f1bb974802cd

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          To Appear in Proceedings of IEEE Globecom 2023
          cs.IT eess.SP math.IT

          Numerical methods,Information systems & theory,Electrical engineering
          Numerical methods, Information systems & theory, Electrical engineering

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