Analysis of Carrier Frequency Offset in Alamouti Space-Time-Frequency Coded OFDM Systems

Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany

Proceedings: PIMRC 2005

Pages: 5Language: englishTyp: PDF

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Suraweera, Himal A.; Armstrong, Jean (Department of Electrical and Computer Systems Engineering, Monash University, Melbourne Victoria 3800, Australia)

It is well known that orthogonal frequency division multiplexing (OFDM) systems are sensitive to carrier frequency offset (CFO). In this paper we present the effects of CFO for OFDM systems where the Alamouti code is used to map adjacent subcarriers (space-frequency) or symbols (space-time) across the space-frequency grid. Simulation results show that space-time-frequency coded OFDM systems are more sensitive to CFO effects than conventional OFDM. We have also presented an analytical error performance analysis for the case of STC-OFDM over frequency flat Rayleigh fading channels. The theoretical results have been validated from the simulations. However the usually assumed signal independent Gaussian ICI analysis provides pessimistic results.