Apparatus and methods for estimating and compensating...

Details Apparatus and methods for estimating and compensating... Apparatus and methods for estimating and compensating...

2008-05-07

2010-11-30

Rao, Seema S (Department: 2462)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

C375S259000, C375S260000, C375S371000

Reexamination Certificate

active

07843806

ABSTRACT:
An apparatus for sampling clock recovery (SCO) and methods for estimating and compensating SCO are provided. The apparatus comprises a symbol timing adjustment module for shifting forward or backward symbol timing of the transmitted OFDM symbols; a discrete Fourier transform (DFT) processor for performing DFT to an output from the symbol timing adjustment module; a channel estimator for undertaking a channel frequency response estimation based on a channel estimation sequence; a SCO phase rotator for receiving and performing phase shift on the transmitted OFDM symbols of a frame header and a frame payload; an SCO estimation stage for undertaking an SCO estimation based on a pilot-subcarrier-related output of the SCO phase rotator and the CFR estimation; and an SCO compensation distributor for dividing the SCO estimation into integer and fractional portions and then distributing them into the symbol timing adjustment module and the SCO phase rotator, respectively.

REFERENCES:
patent: 2007/0133392 (2007-06-01), Shin et al.
patent: 2007/0223605 (2007-09-01), Voltz et al.
patent: 2008/0130813 (2008-06-01), Hwang et al.
“A Fine Frequency and Fine Sample Clock Estimation Technique for OFDM Systems” by R Heaton, S. Duncan, B.Hodson published on Mar. 13, 2001.
A. Batra, J. Balakrishnan, G. R. Aiello, J. R. Foerster, and A. Dabak, “Design of a multiband OFDM system for realistic UWB channel environments,”IEEE Trans. Microwave Theory and Techniques, vol. 52, No. 9, pp. 2123-2138, Sep. 2004.
WiMedia MBOA,MultiBand OFDM Physical Layer Specification, ver. 1.1.5, Jul. 14, 2006.
P.-Y. Tsai, H.-Y. Kang, and T.-D. Chiueh, “Joint weighted least-squares estimation of carrier-frequency offset and timing offset for OFDM systems over multipath fading channels,” IEEE Trans. Veh. Technol., vol. 54, No. 1, pp. 211-223, Jan. 2005.
J. Liu and J. Li, “Parameter estimation and error reduction for OFDM-based WLANs,” IEEE Trans. Mobile. Computing, vol. 3, No. 2, pp. 152-163, Apr.-Jun. 2004.
L. Deneire, P. Vandenameele, L. V. D. Perre, B. Gyselinckx, and M. Engels, “A low complexity ML channel estimator for OFDM,” IEEE Trans. Commun., vol. 51, No. 2, pp. 135-140, Feb. 2003.

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