Apparatus and method for sharing a TCXO of a mobile terminal using a global positioning system in a mobile communication system

• US 20070205939A1
• Filed: 02/15/2007
• Published: 09/06/2007
• Est. Priority Date: 02/15/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Limited (Samsung Electronics Co. Ltd.)
• Inventors: Bae, Hyung-Jin
• Application Number:
  US11/706,844
• Publication Number:
  US 20070205939A1
• Time in Patent Office: Days
• US Class Current: 342/357.620
• CPC Class Codes: G01S 19/235 Calibration of receiver components
• CPC Class Codes: H04B 1/3805 with built-in auxiliary receivers

Abstract

An apparatus and a method for sharing a temperature compensated crystal oscillator (TCXO) of a mobile terminal using a global positioning system (GPS). A communication system processor performs a process for a mobile communication system, computes a frequency variation according to a frequency change and outputs a value corresponding to the computed frequency variation to a system TCXO and a GPS processor. The GPS processor receives and processes a GPS signal, receives the value of the computed frequency variation from the communication system processor, and performs an operation for frequency compensation according to the value.

Claims

1. An apparatus for sharing a temperature compensated crystal oscillator (TCXO) of a mobile terminal using a global positioning system (GPS), comprising:

a communication system processor for performing a process for a mobile communication system, computing a frequency variation according to a frequency change and outputting a value of the computed frequency variation to a system TCXO and a GPS processor; and

the GPS processor for receiving and processing a GPS signal, receiving a value of the computed frequency variation from the communication system processor, and performing an operation for frequency compensation according to the value.

2. The apparatus of claim 1, wherein the communication system processor comprises:

a pulse density modulation (PDM) signal controller for computing the frequency variation and outputting the value of the computed frequency variation to the system TCXO.

3. The apparatus of claim 1, wherein the GPS processor comprises:

a carrier numerically controlled oscillator (NCO) for performing the operation for the frequency compensation according to the value received from the communication system processor; and

a frequency compensator for compensating a frequency according to a value computed by the carrier NCO.

4. The apparatus of claim 3, wherein the carrier NCO comprises:

an adder for performing an operation according to the frequency change; and

a buffer register for storing a predetermined value for the operation.

5. A method for sharing a temperature compensated crystal oscillator (TCXO) of a mobile terminal for a global positioning system (GPS), comprising the steps of:

detecting a frequency variation of a communication system and comparing a value of the frequency variation with a predetermined reference value;

adjusting a frequency value of a system TCXO according to a comparison result; and

synchronizing the TCXO to a base station signal according to an automatic frequency control operation.