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Carrier frequency offset estimation for OFDM/SDMA systems using consecutive pilots

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1 Author(s)
X. Dai ; Dept. of Electron. & Commun. Eng., Sun Yat-sen Univ., Guangzhou, China

Carrier frequency offsets (CFO) greatly degrade the performance of orthogonal frequency-division multiplexing (OFDM) systems because they may violate the orthogonality of subcarriers and introduce intercarrier interferences. CFO effects of uplink of a spatial-diversity multiple-access (SDMA) OFDM system are first approximated by the CFO-vectors which are the fast Fourier transform (FFT) of complex exponential functions associated with the CFO. Then, the CFO-vectors are optimally estimated in a minimum mean square error sense by appropriately designing pilots which are in fact the δ-sequences subject to a specified distribution. In addition, the estimation is further improved by imposing a window function on the received signals to reduce the side-lobe leakages of the CFO-vectors. Through simulations, it is shown that the new estimators provide a satisfactory CFO estimation for fine tracking of uplink of OFDM/SDMA systems.

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IEE Proceedings - Communications  (Volume:152 ,  Issue: 5 )