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It is well known that Carrier frequency offset (CFO) is a performance limiting factor in orthogonal frequency division multiplexing (OFDM) systems. In this paper, we present maximum-likelihood estimators (MLE) for the CFO in OFDM systems in static and time-varying channels and evaluate the Cramer-Rao lower bounds (CRLB) for both cases. In addition, we examine the effect of power amplifiers' (PA) nonlinearity,...
Orthogonal frequency division multiplexing (OFDM) is a bandwidth efficient modulation technique suitable for broadband wireless communications in frequency selective fading channels, yet, its performance is sensitive to timing and carrier synchronization errors. This paper provides an overview on the causes and the effects of these synchronization errors. The authors survey various symbol timing and...
Carrier frequency offset (CFO) is a major contributor to the inter-carrier interference in OFDM systems. This effect becomes more severe when compounded by the presence of Doppler fading in wireless channels. This paper presents two maximum-likelihood CFO estimation schemes, one in frequency domain and another in time-domain, both under Doppler fading. The properties of the estimators are analyzed...
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