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Null sub-carrier based carrier frequency offset estimation for OFDMA uplink systems

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3 Author(s)
Gul, M.M.U. ; Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA ; Sungeun Lee ; Ma, Xiaoli

We propose a null sub-carrier based carrier frequency offset (CFO) estimation technique for OFDMA uplink systems. We discuss the effect of multi-user interference and channel nulls on the identifiability of CFO estimation. We also derive the CFO acquisition range of the algorithm and the optimum location of the null sub-carriers. We prove that the identifiability due to multi-user interference is guaranteed under the CFO estimation range supported by the algorithm. The performance of the algorithm is also evaluated through simulation results.

Published in:

Digital Signal Processing Workshop and IEEE Signal Processing Education Workshop (DSP/SPE), 2011 IEEE

Date of Conference:

4-7 Jan. 2011