# US 2013/0278459 A1 · Wireless communication device and associated method including control of positioning-system receiver and shared oscillator

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- Number: US 2013/0278459 A1
- Document ID: US20130278459A1
- Status: Published application
- Kind: A1
- Application number: 13/922,522
- Filed: 2013-06-20
- Published: 2013-10-24
- Earliest claimed: 2006-04-06
- Assignees: Research In Motion Limited
- Applicants: Research In Motion Limited
- Inventors: XIN JIN
- Web page: https://patentgrep.com/patent/US20130278459A1

## CPC

- G01S 19/21: Interference related issues {; Issues related to cross-correlation, spoofing or other methods of denial of service}
- G01S 19/235: {Calibration of receiver components}
- G01S 19/35: Constructional details or hardware or software details of the signal processing chain
- H04B 1/3805: with built-in auxiliary receivers
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- H04B: TRANSMISSION

## Abstract

The wireless communication device includes a wireless communication transceiver to generate an oscillator control signal and an activation signal, a positioning-system receiver (e.g. a GPS receiver) to process received positioning signals, and a shared oscillator (e.g. a temperature compensated and voltage controlled crystal oscillator TCVCXO) responsive to the oscillator control signal and to generate a reference frequency signal for the wireless communication transceiver and the positioning-system receiver. The positioning-system receiver may control processing of the received positioning signals based upon the activation signal to reduce a noise contribution (e.g. phase noise) due to frequency control of the shared oscillator based upon the oscillator control signal. The activation signal may indicate that the oscillator control signal is being varied to provide frequency control or adjustment of the shared oscillator.

## Claims

### Claim at position 1

1-21. (canceled)

### Claim 22

A mobile wireless communication device comprising:
a cellular transceiver configured to generate an oscillator control signal and an activation signal;
a global positioning system (GPS) receiver; and
a shared oscillator configured to generate a reference frequency signal for the cellular transceiver and the GPS receiver based upon the oscillator control signal;
the GPS receiver configured to control coherent correlation of received positioning signals based upon the activation signal.

### Claim 23 (depends on 22)

The mobile wireless communication device of claim 22 wherein the cellular transceiver comprises a first frequency synthesizer configured to generate first clock signals based upon the reference frequency signal.

### Claim 24 (depends on 23)

The mobile wireless communication device of claim 23 wherein the GPS receiver comprises:
a second frequency synthesizer configured to generate second clock signals based upon the reference frequency signal; and
a controller configured to control processing of the received positioning signals based upon the activation signal.

### Claim 25 (depends on 24)

The mobile wireless communication device of claim 24 wherein the GPS receiver further comprises:
a coherent correlator configured to correlate locally generated pseudo noise with the received positioning signals;
a non-coherent combiner configured to non-coherently combine correlation results from the coherent correlator; and
a pseudo-range calculator configured to calculate pseudo-ranges based upon non-coherently combined correlation results from the non-coherent combiner;
the controller configured to provide control signals to the coherent correlator and the non-coherent combiner based upon the activation signal.

### Claim 26 (depends on 22)

The mobile wireless communication device of claim 22 wherein the cellular transceiver comprises:
a first down converter configured to down convert received communication signals;
a digital-to-analog converter (DAC) receiving the oscillator control signal; and
a first frequency synthesizer configured to generate first clock signals to at least the first down converter based upon the reference frequency signal.

### Claim 27 (depends on 26)

The mobile wireless communication device of claim 26 wherein the GPS receiver comprises:
a second down converter configured to down convert received positioning signals;
a coherent correlator downstream from the second down converter configured to correlate locally generated pseudo noise with the received positioning signals;
a non-coherent combiner configured to non-coherently combine correlation results from the coherent correlator;
a pseudo-range calculator configured to calculate pseudo-ranges based upon non-coherently combined correlation results from the non-coherent combiner;
a second frequency synthesizer configured to generate second clock signals to at least the second down converter based upon the reference frequency signal; and
a controller configured to provide control signals to the coherent correlator and the non-coherent combiner based upon the activation signal.

### Claim 28 (depends on 22)

The mobile wireless communication device of claim 22 wherein the activation signal indicates that the oscillator control signal is being varied to provide frequency control of the shared oscillator.

### Claim 29 (depends on 22)

The mobile wireless communication device of claim 22 wherein the shared oscillator comprises a temperature compensated and voltage controlled crystal oscillator (TCVCXO).

### Claim 30

A mobile wireless communication device comprising:
a wireless transceiver configured to generate an oscillator control signal and an activation signal, the activation signal indicating that the oscillator control signal is being varied to provide frequency control;
a global positioning system (GPS) receiver; and
a shared voltage controlled crystal oscillator (VCXO) configured to generate a reference frequency signal for the wireless transceiver and the GPS receiver;
the GPS receiver configured to control coherent correlation of received positioning signals based upon the activation signal.

### Claim 31 (depends on 30)

The mobile wireless communication device of claim 30 wherein the wireless transceiver comprises a first frequency synthesizer configured to generate first clock signals based upon the reference frequency signal.

### Claim 32 (depends on 31)

The mobile wireless communication device of claim 31 wherein the GPS receiver comprises:
a second frequency synthesizer configured to generate second clock signals based upon the reference frequency signal; and
a controller configured to control processing of the received positioning signals based upon the activation signal.

### Claim 33 (depends on 32)

The mobile wireless communication device of claim 32 wherein the GPS receiver further comprises:
a coherent correlator configured to correlate locally generated pseudo noise with the received positioning signals;
a non-coherent combiner configured to non-coherently combine correlation results from the coherent correlator; and
a pseudo-range calculator configured to calculate pseudo-ranges based upon non-coherently combined correlation results from the non-coherent combiner;
the controller configured to provide control signals to the coherent correlator and the non-coherent combiner based upon the activation signal.

### Claim 34 (depends on 30)

The mobile wireless communication device of claim 30 wherein the wireless transceiver comprises:
a first down converter configured to down convert received communication signals;
a digital-to-analog converter (DAC) receiving the oscillator control signal; and
a first frequency synthesizer configured to generate first clock signals to the first down converter based upon the reference frequency signal.

### Claim 35 (depends on 34)

The mobile wireless communication device of claim 34 wherein the GPS receiver comprises:
a second down converter configured to down convert received positioning signals;
a coherent correlator downstream from the second down converter configured to correlate locally generated pseudo noise with the received positioning signals;
a non-coherent combiner configured to non-coherently combine correlation results from the coherent correlator;
a pseudo-range calculator configured to calculate pseudo-ranges based upon non-coherently combined correlation results from the non-coherent combiner;
a second frequency synthesizer configured to generate second clock signals to the second down converter based upon the reference frequency signal; and
a controller configured to provide control signals to the coherent correlator and the non-coherent combiner based upon the activation signal.

### Claim 36 (depends on 30)

The mobile wireless communication device of claim 30 wherein the activation signal indicates that the oscillator control signal is being varied to provide frequency control of the shared oscillator.

### Claim 37

A method of operating a mobile wireless communication device comprising:
generating an oscillator control signal and an activation signal with a cellular transceiver;
processing received positioning signals with a global positioning system (GPS) receiver;
generating a reference frequency signal for the cellular transceiver and the GPS receiver with a shared oscillator responsive to the oscillator control signal; and
controlling coherent correlation of the received positioning signals based upon the activation signal.

### Claim 38 (depends on 37)

The method of claim 37 further comprising generating first clock signals from a first frequency synthesizer of the cellular transceiver based upon the reference frequency signal.

### Claim 39 (depends on 38)

The method of claim 38 wherein processing received positioning signals with the GPS receiver comprises:
generating second clock signals from a second frequency synthesizer based upon the reference frequency signal; and
controlling processing of the received positioning signals with a controller of the GPS receiver based upon the activation signal.

### Claim 40 (depends on 39)

The method of claim 39 wherein processing received positioning signals with the GPS receiver further comprises:
correlating locally generated pseudo noise with the received positioning signals via a coherent correlator;
non-coherently combining correlation results from the coherent correlator via a non-coherent combiner; and
calculating pseudo-ranges with a pseudo-range calculator based upon non-coherently combined correlation results from the non-coherent combiner;
providing control signals to the coherent correlator and the non-coherent combiner from the controller based upon the activation signal.

### Claim 41 (depends on 37)

The method of claim 37 wherein generating the oscillator control signal and the activation signal comprises:
down converting received communication signals in a first down converter;
performing a digital-to-analog conversion of the oscillator control signal; and
generating first clock signals for the first down converter with a first frequency synthesizer based upon the reference frequency signal.

### Claim 42 (depends on 41)

The method of claim 41 wherein processing received positioning signals with the GPS receiver comprises:
down converting received positioning signals with a second down converter;
correlating locally generated pseudo noise with the received positioning signals via a coherent correlator downstream from the second down converter;
non-coherently combining correlation results from the coherent correlator with a non-coherent combiner;
calculating pseudo-ranges with a pseudo-range calculator based upon non-coherently combined correlation results from the non-coherent combiner;
generating second clock signals with a second frequency synthesizer to at least the second down converter based upon the reference frequency signal; and
providing control signals from a controller to the coherent correlator and the non-coherent combiner based upon the activation signal.

### Claim 43 (depends on 37)

The method of claim 37 wherein the activation signal indicates that the oscillator control signal is being varied to provide frequency control of the shared oscillator.