Fast blind scan method insensitive to adjacent channel interference
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United States of America Patent
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Jan 20, 2015
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May 3, 2013
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Dec 19, 2012
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Abstract
A fast blind scan method first initializes pointers to fetch a block of spectrum and then checks whether the block contains a high spectrum signal and whether the difference between a carrier frequency of the high spectrum signal and a start pointer is greater than a first threshold. When the high spectrum signal is absent or the difference is not greater than the first threshold, it checks whether there is a full band channel in the block. When the full band channel exists, a signal detection and parameter extraction operation is performed and the start pointer is set to be a frequency of a second cross point. Then, it checks whether the difference between the start pointer and an end pointer is greater than a second threshold and, if not, a carrier frequency pointer is set to enable a tuner to fetch a next block.
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