Ofdm demodulation device

Details Ofdm demodulation device Ofdm demodulation device

2003-12-18

2008-11-04

Payne, David C. (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S295000, C375S303000, C375S304000, C375S344000, C375S272000

Reexamination Certificate

active

07447277

ABSTRACT:
An OFDM receiver (1) is provided which includes a clock-frequency error calculation circuit (41) to calculate a difference in clock frequency between a clock for a received signal and an operation clock used in the receiver (1), and a guard correlation/peak detection circuit (12) to determine an autocorrelation of a guard interval and detect a peak timing of the correlation signal. The guard correlation/peak detection circuit (12) incorporates a free-running counter, and outputs a count of the free-running counter at the peak timing to the clock-frequency error calculation circuit (41). The clock-frequency error calculation circuit (41) uses a plurality of time-change rate detection circuits provided at different time intervals to calculate a time-change rate of an input count. The clock-frequency error calculation circuit (41) plots the time-change rates to generate a histogram and calculates a clock-frequency error from the histogram.

REFERENCES:
patent: 6246717 (2001-06-01), Chen et al.
patent: 6735255 (2004-05-01), Smart et al.
patent: 2003/0117943 (2003-06-01), Sakata et al.

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