OFDM receiver and doppler frequency estimating circuit

Details OFDM receiver and doppler frequency estimating circuit OFDM receiver and doppler frequency estimating circuit

2011-07-19

2011-07-19

Odom, Curtis B (Department: 2611)

Pulse or digital communications

Receivers

C375S260000, C375S267000, C375S344000, C375S348000, C370S203000, C370S208000

Reexamination Certificate

active

07983360

ABSTRACT:
A radiofrequency signal is converted to an intermediate frequency signal by a tuner, which is amplified by a variable gain amplifier. The so-amplified signal is converted into a digital signal by an ADC, which is supplied to an FFT, where it is separated into signals set every carrier, followed by being supplied to equalizers different in characteristic. The digital signal outputted from the ADC is further supplied to a level converting circuit from which a control signal is generated. The control signal is supplied to a DAC and a Doppler frequency detector. The DAC generates a gain control signal and supplies the same to the variable gain amplifier. The Doppler frequency detector outputs a frequency component of the control signal as a Doppler detection signal. The Doppler detection signal is compared with a threshold value by a comparator. A selector selects one of signals outputted from the equalizers, in accordance with a select signal indicative of the result of comparison.

REFERENCES:
patent: 2004/0190657 (2004-09-01), Seki et al.
patent: 2000-022661 (2000-01-01), None
patent: 2004-153811 (2004-05-01), None
patent: 2005-045664 (2005-02-01), None

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