OFDM demodulation device

Details OFDM demodulation device OFDM demodulation device

2007-05-21

2011-12-13

Payne, David C. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C340S384720, C370S480000, C375S340000, C708S290000, C708S313000, C708S847000

Reexamination Certificate

active

08077784

ABSTRACT:
An OFDM (Orthogonal Frequency Division Multiplexing) demodulator includes: an FFT (Fast Fourier Transform) circuit for performing a fast Fourier transform on an OFDM signal; a circuit for extracting an SP (Scattered Pilot) signal from the fast Fourier transformed signal; a circuit for adding a positive or negative sign to the extracted SP signal; a memory for temporarily storing the signed SP signal and an information transmission signal; a carrier interpolation circuit for performing time axis interpolation and frequency axis interpolation on the signed SP signal by a plurality of methods; a complex division circuit for performing a complex division of the information transmission signal by interpolated data; and a memory interface for detecting a timing a prescribed number of signed SP signals have been obtained and an output timing of the interpolated data according to the interpolation method.

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Iguchi, N., et al., “Channel Estimation using Diagonal Interpolation in Digital Terrestrial Broadcasting Receiver,” 2005 IEEE Communications Society, Sep. 2005, p. 531.

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