GUARD INTERVAL ANALYSIS METHOD AND APPARATUS
First Claim
1. A method of processing a received signal, determining a size of a guard interval therein, the method comprising:
- a) forming digital samples of the received signal;
b) generating from the digital samples 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;
c) determining a series of sample locations at which the correlation function exceeds a predetermined threshold;
d) applying at least one comb filter, corresponding to a guard interval size, to the series of sample locations; and
e) deducing information about the guard interval from outputs of the comb filter.
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Accused Products
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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Citations
1 Claim
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1. A method of processing a received signal, determining a size of a guard interval therein, the method comprising:
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a) forming digital samples of the received signal; b) generating from the digital samples 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; c) determining a series of sample locations at which the correlation function exceeds a predetermined threshold; d) applying at least one comb filter, corresponding to a guard interval size, to the series of sample locations; and e) deducing information about the guard interval from outputs of the comb filter.
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Specification