A method for eliminating frequency deviation and mobile terminal

A mobile terminal and frequency offset technology, applied in the field of communications, can solve the problems of low accuracy, inability to effectively eliminate frequency offset, limited accuracy, etc., to achieve the effect of eliminating frequency offset, improving the probability of successful search, and good synchronization

Inactive Publication Date: 2008-03-26
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage of this method is that the accuracy of frequency offset estimation is not high, especially in the case of poor wireless channel environ

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  • A method for eliminating frequency deviation and mobile terminal
  • A method for eliminating frequency deviation and mobile terminal
  • A method for eliminating frequency deviation and mobile terminal

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Embodiment Construction

[0021] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0022] An embodiment of the present invention provides a method for eliminating frequency offset, as shown in FIG. 1 , including;

[0023] Step 101, receiving GPS satellite signals to obtain timing information. The frequency stability of the satellite can reach 0.001ppm, and the timing information accuracy received by the mobile terminal can reach 0.005ppm.

[0024] Step 102: Output a timing pulse signal according to the timing information. The timing pulse signal can reach 1PPS (One Pulse Per Second, one pulse per second), that is, a pulse signal with a width of 50ns is output every second.

[0025] Step 103, using the timing pulse signal to estimate the frequency offset of the VCXO of the mobile terminal.

[0026] The method for frequency offset estimation may be as follows: using the timing pulse signal as a counting control signal, measuring the n...

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Abstract

This invention discloses a method for eliminating frequency deviation and mobile terminals, in which, the method includes: receiving GPS satellite signals to get time information, estimating the frequency deviation of a voltage-controlled crystal oscillator of the mobile terminal based on the time inforamtion, regulating the deviation voltage of the oscillator of the mobile terminal and utilizing the regulated deviation voltage to control the working frequency of the oscillator. This invention utilizes GPS signals to eliminate deviation of a mobile terminal at the beginning to enable it synchronized with the base station so as to increase probability of success for searching local regions initially.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a method for eliminating frequency offset and a mobile terminal. Background technique [0002] In the WCDMA (Wide-Band Code Division Multiple Access) wireless mobile communication system, the base station on the network side uses a high-stability temperature-compensated crystal oscillator as a working clock source, and its frequency stability usually reaches 0.05 ppm (part per million, parts per million), while the mobile terminal on the terminal side uses a VCXO (Voltage-Controlled Crystal Oscillator, Voltage-Controlled Crystal Oscillator), and its frequency stability is generally only about 5ppm. This causes the mobile terminal to generate a frequency offset (Frequency Offset) when receiving the downlink signal sent by the base station, which is generally referred to as frequency offset for short. In addition to generating frequency deviation in this case, Doppl...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B1/10G01S5/02
CPCH04L2027/0016H04L2027/0036H04L2027/0065H04B2201/70715H04B1/707
Inventor 薛林
Owner HUAWEI TECH CO LTD
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