Compensation for frequency adjustment in mobile communication-positioning device with shared oscillator
First Claim
1. In a mobile communication device, a method for compensating for a frequency adjustment in an oscillator shared between a communication circuit and a positioning signal receiver, comprising:
- at a first point in time, beginning receiving into a positioning signal received from the positioning signal receiver;
at a second time point, adjusting a frequency of the oscillator;
recording a frequency adjustment of the oscillator;
at a third time point, completing receiving the positioning signal into the positioning signal receiver; and
processing the positioning signal, taking into consideration the frequency adjustment.
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Accused Products
Abstract
In a mobile communication device, a method for compensating for a frequency adjustment in an oscillator shared between a communication circuit and a positioning signal receiver is provided. In one embodiment, the method begins to receive and store a positioning signal at a first time point. When, at a second time point, the operating frequency of the shared oscillator is adjusted, the frequency adjustment is recorded. After the positioning signal is completely received and stored, the processing of the positioning signal takes into consideration the frequency adjustment. In that embodiment, the processing hypothesizes a frequency shift in the received positioning signal. According to another aspect of the present invention, a method for determining the operating frequency of an oscillator detects a beginning time point of a reference signal received by the mobile communication device and enables a counter to count in step with a clock signal derived from the oscillator. When an ending time point of the reference signal is received by the mobile communication device, the count is stopped, and the frequency of the oscillator is determined based on the count in the counter and an expected time that elapsed between the beginning time point and the ending time point.
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Citations
41 Claims
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1. In a mobile communication device, a method for compensating for a frequency adjustment in an oscillator shared between a communication circuit and a positioning signal receiver, comprising:
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at a first point in time, beginning receiving into a positioning signal received from the positioning signal receiver;
at a second time point, adjusting a frequency of the oscillator;
recording a frequency adjustment of the oscillator;
at a third time point, completing receiving the positioning signal into the positioning signal receiver; and
processing the positioning signal, taking into consideration the frequency adjustment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 18, 19)
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14. In a communication device, a method for determining an operating frequency of an oscillator based on a reference signal from a reliable time base, comprising:
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detecting a beginning time point of the reference signal received by the communication device;
upon detection of the beginning time point of the reference signal, enabling a counter to count in accordance with a clock signal derived from the oscillator;
detecting an ending time point of the reference signal received by the communication device;
upon detecting the ending time point of the reference signal, disabling the counter to stop the counter from further counting; and
determining the frequency of the oscillator based on the count in the counter and an expected time that elapsed between the beginning time point and the ending time point. - View Dependent Claims (15, 16, 17, 20, 21)
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22. A mobile communication device, comprising:
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a communication circuit;
a positioning signal receiver;
an oscillator shared between a communication circuit and a positioning signal receiver providing a frequency that is adjustable from the communication circuit; and
a central processing unit, wherein the central processing unit records a frequency adjustment of the oscillator, and processes the positioning signal, taking into consideration the frequency adjustment. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 38, 39)
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34. An oscillator frequency determining apparatus in a communication device, comprising:
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an oscillator providing a periodic output signal;
a receiver receiving a reference signal from a reliable time base;
a detector detecting a beginning time point and an ending time point of the reference signal received by the communication device;
a counter that begins counting the number of periods in the output signal of the oscillator in response to the detector detecting the beginning time point and stops counter in response to the detector detecting the ending time point of the reference signal; and
arithmetic unit for determining the frequency of the oscillator based on the count in the counter and an expected time that elapsed between the beginning time point and the ending time point. - View Dependent Claims (35, 36, 37, 40, 41)
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Specification