Blind CFO (Carrier Frequency Offset) Estimation refers to the process of estimating the carrier frequency offset without relying on explicit pilot signals or known reference symbols. This is particularly important in scenarios where the receiver does not have prior information about the transmitted signal. In wireless communication, the accuracy of carrier frequency synchronization is crucial.

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

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