Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2011-01-04
2011-01-04
Torres, Juan A (Department: 2611)
Pulse or digital communications
Equalizers
Automatic
C375S232000, C375S229000
Reexamination Certificate
active
07864836
ABSTRACT:
An orthogonal frequency division multiplexing (OFDM) equalizer includes a memory that stores OFDM frame information, a partial sum calculator configured to calculate a partial sum of a data cell corresponding to an OFDM reception signal based on a current pilot cell and a fixing coefficient corresponding to the current pilot cell, an adapting coefficient calculator configured to calculate a channel response of the data cell and calculate an adapting coefficient based on the calculated channel response and an interpolated channel response, an interpolated channel response calculator configured to calculate the interpolated channel response based on the partial sum and the adapting coefficient, and a channel compensation unit configured to output a corrected OFDM reception signal based on the fast Fourier transformed OFDM reception signal and the interpolated channel response. Related receivers and channel equalization methods are also disclosed.
REFERENCES:
patent: 7474611 (2009-01-01), Svensson et al.
patent: 7668269 (2010-02-01), Ma et al.
patent: 7697412 (2010-04-01), Anderson et al.
patent: 2003/0128656 (2003-07-01), Scarpa
patent: 2004/0161057 (2004-08-01), Malladi et al.
patent: 2005/0174929 (2005-08-01), Hayashi et al.
patent: 2006/0056496 (2006-03-01), Smee et al.
patent: 2007/0058734 (2007-03-01), Kao et al.
patent: 2007/0116141 (2007-05-01), Li et al.
patent: 2008/0260052 (2008-10-01), Hayashi
patent: 2009/0067518 (2009-03-01), Melis et al.
patent: 1441484 (2004-07-01), None
patent: 2004228853 (2004-08-01), None
patent: 1020060044087 (2006-05-01), None
P. Hoeher, S. Kaiser and P. Robertson, “Two-Dimensional Pilot-Symbol-Aided Channel Estimation by Wiener Filtering,” in Proc. IEEE ICASSP '97, Munich, Germany pp. 18451848, Apr. 1997.
F. Sanzi and J. Speidel, “An Adaptive Two-Dimensional Channel Estimator for Wireless OFDM with Application to Mobile DVB-T,” IEEE Transactions on Broadcasting, vol. 46, No. 2, Jun. 2000.
X. Hou, S. Li, D. Liu, C. Yin; G. Yue, “On-two-dimensional adaptive channel estimation in OFDM systems,” IEEE 60th Vehicular Technology Conference, VTC2004-Fall, 2004.
P. Schniter, “Low-complexity Equalization of OFDM in Doubly Selective Channels,” IEEE Trans. Signal Processing, vol. 52, No. 4, Apr. 2004, pp. 1002-1011.
Myers Bigel & Sibley & Sajovec
Samsung Electronics Co,. Ltd.
Torres Juan A
LandOfFree
Adaptive orthogonal frequency division multiplexing (OFDM)... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive orthogonal frequency division multiplexing (OFDM)..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive orthogonal frequency division multiplexing (OFDM)... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2719867