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This paper investigates an improved integer frequency offset (IFO) estimator based on guard band power ratio detection (PRD) in orthogonal frequency division multiplexing (OFDM) systems, which can work with large residual fractional frequency offsets (FFOs) and therefore large inter-carrier-interference (ICIs), resulting in excellent performance in very low signal-to-noise ratio (SNR) environments...
As receiver performance will be degraded by carrier frequency offset (CFO), Doppler shift, and low signal-to-noise ratio (SNR), a novel estimator that jointly considers CFO, Doppler shift, and SNR is proposed in this paper. The proposed algorithm uses the Fourier transform (FT) to calculate the power spectral density of time-varying channels through channel estimates. Then, a new periodogram technique...
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