Method and apparatus for guard interval detection in...

Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels

Reexamination Certificate

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C370S504000

Reexamination Certificate

active

07570666

ABSTRACT:
An apparatus and method for guard interval detection in a multi-carrier receiver has been disclosed. According to the present invention, the apparatus and method are employed for determining a guard interval length of an input signal to be one of a plurality of available guard interval lengths. The apparatus of the present invention includes an auto-correlator, a power density calculator and a maximum detector. The auto-correlator is used to generate a correlation result in response to the input signal, and the power density calculator is used to generate a plurality of power density results in response the correlation result and the available guard interval lengths. The maximum detector is employed to generate a determination result in response to the maximum value of the plurality of power density results.

REFERENCES:
patent: 6125124 (2000-09-01), Junell et al.
patent: 2002/0186791 (2002-12-01), Foxcroft et al.
patent: 2003/0219084 (2003-11-01), Parker
patent: 2004/0066802 (2004-04-01), Ro et al.
patent: 2005/0286485 (2005-12-01), Golden et al.
Hiroshi Nogami, et al. A Transmission Mode Detector for OFDM Systems, Electroncis and Communications in Japan, Part 1, vol. 86, No. 8, pp. 79-94, (2003).
Shiou-Hong Chen, et al. Mode Detection, Synchronization, and Channel Estimation for DVB-T OFDM Receiver, Globecom, 0-7803-7974-8/3 (2003), pp. 2416-2420.

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