Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2008-07-01
2008-07-01
Tran, Khai (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
Reexamination Certificate
active
10919396
ABSTRACT:
An apparatus includes a converter separating the OFDM signal into the several sub-carriers, an extraction circuit extracting the reference symbol from at least one of a plurality of sub-carriers, an estimation circuit estimating a transmission distortion channel every the sub-carrier based on the amplitude and phase characteristic of the reference symbol, an adder adding channel estimation results of a first sub-carrier be set at least one of the plurality of sub-carriers, a second sub-carrier adjacent to a high-band side of the first sub-carrier and a third sub-carrier adjacent to a low-band side of the first sub-carrier, a calculator calculating the average of the added value to obtain amplitude and phase correction values with respect to the first sub-carrier, and a correction circuit correcting amplitude and phase with respect to each of the plurality of sub-carriers based on the amplitude and phase correction values.
REFERENCES:
patent: 2006/0039331 (2006-02-01), Abeta et al.
patent: 2001-197032 (2001-07-01), None
patent: 2001-268048 (2001-09-01), None
Takeshi Onizawa, et al., “A Novel Channel Estimation Scheme Employing Adaptive Selection of Frequency-Domain Filters for OFDM Systems”, IEICE Trans. Commun., vol. E82-B, No. 12, Dec. 1999, pp. 1923-1931.
Kabushiki Kaisha Toshiba
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Tran Khai
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