Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers
Reexamination Certificate
2005-11-08
2009-08-04
Moe, Aung S (Department: 2416)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Quadrature carriers
C370S208000, C375S262000, C375S341000
Reexamination Certificate
active
07570578
ABSTRACT:
An OFDM demodulator that demodulates an OFDM signal includes an antenna that receives a signal including delayed signals, an estimation circuit that estimates the channel response of the received signal, and a control circuit that controls a length of a retention time interval based on the estimated channel response. The retention time interval includes a time period from the head of a delayed signal having a maximum delay time in the delayed signals to the tail of a preceding signal in the delayed signals based on the estimated channel response. The OFDM demodulator also includes a retention memory that retains a portion of the received signal corresponding to the retention time period, and a selection circuit that selects an OFDM symbol based on a calculation of a maximum likelihood that the retained received signal is equivalent to a signal replica based on the channel response.
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Kasami Hideo
Matsuoka Hidehiro
Tsuruta Makoto
Kabushiki Kaisha Toshiba
Mered Habte
Moe Aung S
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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