Orthogonal frequency-division multiplexing (OFDM) systems are highly sensitive to synchronization errors. In this paper, we introduce an algorithm for the blind estimation of symbol timing and carrier frequency offset in wireless OFDM systems. The proposed estimator is an extension of the Gini–Giannakis estimator for single-carrier systems. It exploits the cyclostationarity of OFDM signals and ...

—A high-accurate frequency estimation algorithm is proposed in the 60GHz OFDM wireless communication system. The phase offset is caused by the carrier frequency offset, and its accumulation has a linear relationship in the time. So the preamble sequence phase can be obtained by the algorithm in this paper, and then the carrier frequency offset value is calculated by the linear regression theor...

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This paper deals with the problem of blind estimation of the carrier frequency offset of a linearly modulated noncircular transmission through an unknown frequency-selective channel. A frequency estimator is developed based on the unique conjugate cyclic frequency of the received signal, which is equal to twice the frequency offset. Consistency and asymptotic normality of the frequency estimato...

In this paper, the problem of carrier frequency offset estimation for frequency-selective channels in a data-aided context is considered. The channel is assumed to be contaminated with an unknown noise and the Cramér-Rao bound (CRB) is used as an estimation accuracy criterion. The minimax approach consists in minimizing the worst-case (maximum) CRB of the frequency offset. Under certain assumpt...

The outage probability of reverse link multicarrier (MC) code-division multiple access (CDMA) systems with beamforming in the presence of carrier frequency offset (CFO) is studied. A conventional uniform linear array (ULA) beamformer is utilized. An independent Nakagami fading channel is assumed for each subcarrier of all users. The outage probability is first investigated under a scenario wher...

In this paper we present two extensions to a previously published OFDM carrier frequency-offset estimation method. The previously presented algorithm is based on locating the spectral minimas within so-called null or virtual subcarriers embedded in the spectrum. In this paper we develop this idea further by using a steepest descent method to find the minima and the estimate. We also study the e...

In this paper, a new model and compensation scheme of quadrature imbalance in analog I/Q OFDM transceivers is presented. Classically, the effect of I/Q imbalance is modeled by a cross-talk between pairs of symmetrical OFDM sub-carriers. We show that this model is not valid when the carrier frequency offset is compensated after the source of I/Q mismatch. Assuming a perfect digital compensation ...

The performance of an OFDM system is affected by parameters such as carrier frequency offset and phase noise. In the presence of such parameters the performance of OFDM system degrades. Under Rayleigh fading environment the performance fluctuates depending on the signal strength. In this paper the performance of an OFDM system is studied in the presence of Rayleigh fading channel. Results show ...