Guard interval analysis method and apparatus

Details Guard interval analysis method and apparatus Guard interval analysis method and apparatus

2003-01-10

2008-09-09

Burd, Kevin M (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

07424048

ABSTRACT:
A receiver circuit processes a received signal to determine information regarding a guard interval therein. The receiver circuit typically forms digital samples from the received signal; generates a correlation function with peaks at positions that are determined by the size of the guard interval and a position of the guard interval within the received signal. The receiver circuit includes one or more comb filters, each corresponding to a possible guard interval size, each receiving a series of locations at which the correlation function exceeds a predetermined threshold, and each producing an output that provides information about the guard interval size and/or position. This advantageously allows the receiver circuit to determine the guard interval size quickly, for example, even in the case of received signals with relatively low signal-noise ratio.

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Scalise, et al., A Prototype VLSI Solution for Digital Terrestrial TV Receivers Conforming to the DVB-T Standard , SMPTE Journal, Nov. 1997.

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