LOW LATENCY FREQUENCY SWITCHING
First Claim
1. A receiver, comprising:
- a synthesizer tunable to at least first and second frequencies respectively corresponding to at least first and second communication modes; and
a receive chain configured to transition between the at least first and second communication modes prior to the synthesizer respectively settling between the at least first and second frequencies.
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Abstract
Techniques for improved low latency frequency switching are disclosed. In one embodiment, a controller receives a frequency switch command and generates a frequency switch signal at a time determined in accordance with a system timer. In another embodiment, gain calibration is initiated subsequent to the frequency switch signal delayed by the expected frequency synthesizer settling time. In yet another embodiment, DC cancellation control and gain control are iterated to perform gain calibration, with signaling to control the iterations without need for processor intervention. Various other embodiments are also presented. Aspects of the embodiments disclosed may yield the benefit of reducing latency during frequency switching, allowing for increased measurements at alternate frequencies, reduced time spent on alternate frequencies, and the capacity and throughput improvements that follow from minimization of disruption of an active communication session and improved neighbor selection.
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Citations
21 Claims
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1. A receiver, comprising:
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a synthesizer tunable to at least first and second frequencies respectively corresponding to at least first and second communication modes; and a receive chain configured to transition between the at least first and second communication modes prior to the synthesizer respectively settling between the at least first and second frequencies. - View Dependent Claims (2, 3, 4, 5)
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6. A dual-mode receiver, comprising:
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a retunable synthesizer alternatingly configurable between a first communication mode corresponding to a first frequency and a second communication mode corresponding to a second frequency; and a reconfigurable receive chain alternatingly configurable between the first communication mode and the second communication mode, the synthesizer and receive chain substantially concurrently configurable such that the receive chain is reconfigured before the synthesizer settles. - View Dependent Claims (7, 8, 9, 10)
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11. A computer-readable medium including computer-executable instructions for causing a computer to changing communication modes, comprising:
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instructions for causing the computer to retune from a first frequency to a second frequency respectively corresponding to a first communication mode and a second communication mode; and instructions for causing the computer to reconfigure a receive chain from the first communication mode to the second communication mode before the second frequency settles. - View Dependent Claims (12, 13, 14, 15)
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16. A method for monitoring a communication mode, comprising:
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determining a time gap of a first communication mode; retuning at a beginning of the time gap from a first frequency corresponding to the first communication mode to a second frequency corresponding to the second communication mode; and reconfiguring a receiver from the first communication mode to the second communication mode before the second frequency settles. - View Dependent Claims (17, 18, 19, 20)
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21. A computer-readable medium including computer-executable instructions comprising:
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instructions for causing a computer to determine a time gap of a first communication mode; instructions for causing the computer to retune at a beginning of the time gap from a first frequency corresponding to the first communication mode to a second frequency corresponding to the second communication mode; and instructions for causing the computer to reconfigure a receiver from the first communication mode to the second communication mode before the second frequency settles.
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Specification