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AssigneeEnuvis, Inc.
InventorsL. Scott Bloebaum, Piyush Bharti, Sherk Chung, Benjamin Van Roy, Wallace Mann
Estimating the term…
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.
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:
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:
A mobile communication device, comprising:
An oscillator frequency determining apparatus in a communication device, comprising:
Dependencies are inferred from the claim text.
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Acquisition or tracking or demodulation of signals transmitted by the system: carrier including Doppler, related
Testing, monitoring, correcting or calibrating of receiver elements: calibration of receiver components
Constructional details or hardware or software details of the signal processing chain: hardware or software details of the signal processing chain
Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general: using a central processing unit,…
Term end not estimated
1. Field of the Invention
The present invention relates to a mobile communication device with a positioning capability. In particular, the present invention relates to a mobile communication device (e.g., a cellular telephone) that is also capable of receiving a global positioning system (GPS) signal, and which shares an oscillator between the communication and positioning functions.
2. Description of the Related Art
FIG. 1 shows a block diagram of mobile communication device 100 to which a method of the present invention is applicable.
FIG. 2 shows a flow chart of method 200 that compensates for the frequency adjustment in shared local oscillator 108, in accordance with one embodiment of the present invention.
FIG. 3 shows a block diagram of mobile communication device 100 to which a method of the present invention is also applicable.
To facilitate comparison between figures and to simplify the detailed description below, like reference numerals are used for like elements in the figures.
The present invention provides a method that compensates the frequency adjustment effects in the positioning signal detection process. According to another aspect of the present invention, a method for accurately determining the frequency of a local oscillator is provided.
FIG. 1 shows a block diagram of mobile communication device 100 to which a method of the present invention is applicable. Mobile communication device 100 can be, for example, a cellular telephone handset. As shown in FIG. 1, mobile communication device 100 includes communication receiver 101, communication transmitter 102, positioning signal receiver 103, analog baseband circuit 106, digital baseband circuit 107, shared local oscillator 108 and synthesizer 109. In mobile communication device 100, shared local oscillator 108 is the frequency source for communication receiver 101, communication transmitter 102, and positioning signal receiver 103. Shared local oscillator 108 can be implemented, for example, by a voltage-controlled oscillator. Antenna 104 serves both communication receiver 101 and communication receiver 102, and antenna 105 serves positioning signal receiver 103.