Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2008-03-25
2008-03-25
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S260000, C375S261000, C375S267000
Reexamination Certificate
active
07349500
ABSTRACT:
An apparatus and method for performing coarse frequency synchronization in an orthogonal frequency division multiplexing (OFDM) receiver includes cyclically shifting a received signal X(k) by a predetermined shift amount d, determining the length of a summation interval according to a phase coherence bandwidth and a number K of sub-bands into which the summation interval is divided, generating and adjusting a symbol time offset according to the number K of sub-bands, generating a weighted phase reference signal Z(k) which is phase-shifted by the symbol time offset and weighted by a weighting vector determined according to a frequency band, partially correlating the shifted signal X(k+d) and the weighted phase reference symbol Z(k) and calculating a partial correlation value for each of the K sub-bands; and determining the shift amount dmaxat a maximum sum of the partial correlation values and outputs the shift amount dmaxas an estimated coarse frequency offset.
REFERENCES:
patent: 6134286 (2000-10-01), Chennakeshu et al.
patent: 6373861 (2002-04-01), Lee
patent: 6628606 (2003-09-01), Hong et al.
patent: 7088782 (2006-08-01), Mody et al.
patent: 1 220 505 (2002-07-01), None
patent: 1 460 814 (2004-09-01), None
patent: 2 364 868 (2002-02-01), None
patent: 2000-236322 (2000-08-01), None
patent: 2001-156742 (2001-06-01), None
patent: 2003-134078 (2003-05-01), None
patent: WO 99/17511 (1999-04-01), None
Wideband Orthogonal Frequency Division Multiplexing (W-OFDM), 2000 Wi-Lan Inc.
Lee et al. “Coarse Symbol Synchronization Algorithms for OFDM Systems in Multipath Channels”, 2002, pp. 446-448.
Muller et al. “Analysis of a Frame- and Frequency Synchronizer for (Bursty) OFDM”, 1998, pp. 201-206.
Bang (I), et al., “A Coarse Frequency Offset Estimation in an OFDM System Using the Concept of the Coherence Phase Bandwidth”, IEEE International Conference on Communications, vol. 2 of 3, pp. 1135-1139, (Jun. 18, 2000).
Bang (II), et al., “A Coarse Frequency Offest Estimation in an OFDM System Using the Concept of the Coherence Phase Bandwidth”, IEEE Transactions on Communications, vol. 49, No. 8, pp. 1320-1324, (Aug. 2001).
You, et al., “Low-complexity Coarse Frequency-offset Synchronization for OFDM Applications”, IEEE International Conference on Communications, vol. 1 of 10, pp. 2494-2498 (Jun. 11, 2001).
Cho, et al. “PC-Based Receiver for Eureka-147 Digital Audio Broadcasting”, IEEE Transactions on Broadcasting, vol. 47, No. 2, pp. 95-102, (Jun. 2001).
Hsieh, et al., “A Frequency Acquisition Scheme for OFDM Systems” IEEE International Symposium on Personal, Indoor, and Mobile Radio Communications, vol. 3, pp. 843-847, (Oct. 1996).
Aghdam Freshteh N.
Fan Chieh M.
Lee & Morse P.C.
Samsung Electronics Co,. Ltd.
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