Fine FFT window position recovery apparatus of an OFDM system re

Details Fine FFT window position recovery apparatus of an OFDM system re Fine FFT window position recovery apparatus of an OFDM system re

1998-01-09

2000-05-02

Olms, Douglas W.

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via frequency channels

708404, H04J 100, G01R 2300

Patent

active

060581212

ABSTRACT:
A fine fast Fourier transform window position recovering apparatus of an OFDM system receiver for recovering the phase error of an FFT window by using the number of zero-crossings of the phase variation value calculated between transmitted and received complex values is provided. The fine FFT window position recovering apparatus includes: an analog to digital converter, a symbol start detector, an FFT means, a phase calculator, a zero-crossing counter and an FFT window controller. The apparatus makes it possible to guarantee the reliability of a system by adjusting the phase error of the FFT window by using the number of zero-crossings of the phase variation calculated between the transmitted and received complex values and the number of the zero-crossings of the amplitude of the real part or the imaginary part of the received complex value.

REFERENCES:
patent: 5301123 (1994-04-01), Kay

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