Abstract
This comment points out some inaccurate formulae, and shows some irrelevant comparison of different estimators. Moreover, the correct formulae are provided and the modification to the fractional frequency offset (FFO) estimator is indicated. On the other hand, Our analysis have shown that the integer frequency offset (IFO) estimator of Ai is of serious theoretic problem.
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References
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Speth, M., Fechtel, S.A., Fock, G., Meyr, H. Receiver Design for Wireless Broad-Band Systems Using OFDM Part I. IEEE Transactions on Communications, 47(11), 1668–1677.
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Schmidl T.M., Cox D.C. (1997) Robust frequency and timing synchronization for OFDM. IEEE Transactions on Communications 45(12): 1613–1621
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Hua, J., Xu, Z., Xu, X. et al. Comment and further results on paper “Carrier Frequency Recovery Technique in OFDM systems”. Wireless Pers Commun 43, 737–742 (2007). https://doi.org/10.1007/s11277-007-9278-z
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DOI: https://doi.org/10.1007/s11277-007-9278-z