Synchronization method and apparatus for guard interval-based OF

Details Synchronization method and apparatus for guard interval-based OF Synchronization method and apparatus for guard interval-based OF

1997-08-05

1999-11-23

Hsu, Alpus H.

Multiplex communications

Communication over free space

Combining or distributing information via time channels

370504, 375326, 375260, H04B 708

Patent

active

059912898

ABSTRACT:
A synchronization system for an input signal having a plurality of OFDM symbols, each symbol having at least one guard interval, includes a correlation device for providing a product of the input signal with a complex conjugate of the input signal delayed for a predetermined period, an arithmetic device for obtaining an argument value of the product, and a detection device for detecting a transition in phase values of an output of the arithmetic device, wherein the transition occurring when the phase value in one portion of the symbol duration is substantially smaller than another portion of the symbol duration. The system additionally includes a power estimator for detecting an OFDM symbol frame of the input signal with reference to a predetermined threshold, and a device for estimating fractional carrier frequency offset.

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