Automatic gain control in radio frequency receivers
First Claim
1. A method of automatically controlling gain in a white space device, the method comprising:
- entering a quiet time of the white space device;
responsive to entering the quiet time, selecting a first operational mode associated with detecting licensed signals on at least one white space channel, the first operational mode testing a measured received signal strength indicator (RSSI) value to determine which one of a plurality of gain states of an automatic gain control (AGC) to use corresponding to a gain for application to input white space signals on the at least one whitespace channel; and
entering a second operational mode outside of the quiet time, the second operational mode setting a fixed gain state of the plurality of gain states to apply in selecting one of the at least one white space channel on which no licensed signals were detected.
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Accused Products
Abstract
An automatic gain controller (AGC) in white space devices is configured with two operational modes. When entering a quiet time of the white space device, the AGC selects the first operational mode. The first operational mode is associated with detecting licensed signals on one or more white space channels by testing a measured received signal strength indicator (RSSI) value to determine which one of a number of the AGC'"'"'s gain states should be used corresponding to a gain for application to input white space signals on the whitespace channels. When not in the quiet time, the AGC enters a second operational mode. The second operational mode sets a fixed gain state of the AGC'"'"'s multiple gain states to apply in selecting one of the white space channels on which no licensed signals were detected.
10 Citations
16 Claims
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1. A method of automatically controlling gain in a white space device, the method comprising:
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entering a quiet time of the white space device; responsive to entering the quiet time, selecting a first operational mode associated with detecting licensed signals on at least one white space channel, the first operational mode testing a measured received signal strength indicator (RSSI) value to determine which one of a plurality of gain states of an automatic gain control (AGC) to use corresponding to a gain for application to input white space signals on the at least one whitespace channel; and entering a second operational mode outside of the quiet time, the second operational mode setting a fixed gain state of the plurality of gain states to apply in selecting one of the at least one white space channel on which no licensed signals were detected. - View Dependent Claims (2, 3, 4)
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5. A system for automatically controlling gain in a white space device, the system comprising:
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means for entering a quiet time of the white space device; means, executable responsive to execution of the means for entering the quiet time, for selecting a first operational mode associated with detecting licensed signals on at least one white space channel, the first operational mode comprising; means for testing a measured received signal strength indicator (RSSI) value to determine which one of a plurality of gain states of an automatic gain control (AGC) to use corresponding to a gain for application to input white space signals on the one or more whitespace channels; and means for entering a second operational mode outside of the quiet time, the second operational mode setting a fixed gain state of the plurality of gain states to apply in selecting one of the at least one white space channel on which no licensed signals were detected. - View Dependent Claims (6, 7, 8)
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9. A computer program product, comprising:
a computer-readable medium having program code recorded thereon, the program code comprising; program code to enter a quiet time of the white space device; program code, executable in response to entering the quiet time, to select a first operational mode associated with detecting licensed signals on at least one white space channel, the first operational mode comprising; program code to test a measured received signal strength indicator (RSSI) value to determine which one of a plurality of gain states of an automatic gain control (AGC) to use corresponding to a gain for application to input white space signals on the at least one whitespace channel; and program code to enter a second operational mode outside of the quiet time, the second operational mode automatically setting a fixed gain state of the plurality of gain states to apply in selecting one of the at least one white space channel on which no licensed signals were detected. - View Dependent Claims (10, 11, 12)
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13. A white space device comprising:
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a processor; a linear noise amplifier (LNA) coupled to the processor; a digital variable gain amplifier (DVGA) coupled to the LNA; and an automatic gain controller (AGC) coupled to the LNA and the DVGA, the AGC comprising; a first operational mode associated with detecting licensed signals on at least one white space channel, the first operational mode configured to test a measured received signal strength indicator (RSSI) value to determine which one of a plurality of gain states to use corresponding to a gain for application by one of the LNA and the DVGA to input white space signals on the one or more whitespace channels; and a second operational mode configured to automatically set a fixed gain state of the plurality of gain states to apply in selecting one of the at least one white space channel on which no licensed signals were detected. - View Dependent Claims (14, 15, 16)
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Specification