CAPTURE FREQUENCY DECISION METHODS AND RECEIVERS
First Claim
1. A capture frequency decision method of deciding a capture frequency by executing a frequency search in which a correlation operation on a received Code Division Multiple Access signal is performed at a plurality of search frequencies, the method comprising:
- executing a first frequency search;
setting a frequency for a side lobe check on the basis of a correlation integration time used in the first frequency search;
selecting a plurality of search frequencies including the frequency for a side lobe check on the basis of a result of the first frequency search;
executing a second frequency search of performing the correlation operation at the plurality of selected search frequencies; and
deciding a capture frequency by executing a third frequency search using a result of the second frequency search.
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Abstract
A capture frequency decision method of deciding a capture frequency by executing a frequency search in which a correlation operation on a received signal, which is a CDMA (Code Division Multiple Access) signal, is performed at a plurality of search frequencies, includes: executing a first frequency search; setting a frequency for a side lobe check on the basis of a correlation integration time used in the first frequency search; selecting a plurality of search frequencies including the frequency for a side lobe check on the basis of a result of the first frequency search; executing a second frequency search of performing the correlation operation at the plurality of selected search frequencies; and deciding a capture frequency by executing a third frequency search using a result of the second frequency search.
9 Citations
8 Claims
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1. A capture frequency decision method of deciding a capture frequency by executing a frequency search in which a correlation operation on a received Code Division Multiple Access signal is performed at a plurality of search frequencies, the method comprising:
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executing a first frequency search; setting a frequency for a side lobe check on the basis of a correlation integration time used in the first frequency search; selecting a plurality of search frequencies including the frequency for a side lobe check on the basis of a result of the first frequency search; executing a second frequency search of performing the correlation operation at the plurality of selected search frequencies; and deciding a capture frequency by executing a third frequency search using a result of the second frequency search. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A receiver that captures a CDMA signal, which is a received signal, by deciding a capture frequency by executing a frequency search of performing a correlation operation on the CDMA signal in a frequency direction, the receiver comprising:
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a first search executing section that executes a first frequency search; a setting section that sets a frequency for a side lobe check on the basis of a correlation integration time used in the first frequency search; a second search frequency selecting section that selects a plurality of search frequencies including the frequency for a side lobe check on the basis of a result of the first frequency search; a second frequency search executing section that executes a second frequency search of performing the correlation operation at the plurality of selected search frequencies; and a capture frequency deciding section that decides a capture frequency by executing a third frequency search using a result of the second frequency search.
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Specification