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Method and device for automatically adjusting the frequency deviation of crystal oscillator in GSM base station

A GSM base station, automatic correction technology, applied in the field of GSM base station, can solve the problem of inability to correct the frequency offset of the base station crystal oscillator

Inactive Publication Date: 2009-09-02
郝亚敏 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution cannot correct the crystal oscillator frequency offset of the base station

Method used

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  • Method and device for automatically adjusting the frequency deviation of crystal oscillator in GSM base station
  • Method and device for automatically adjusting the frequency deviation of crystal oscillator in GSM base station
  • Method and device for automatically adjusting the frequency deviation of crystal oscillator in GSM base station

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Embodiment Construction

[0040] A kind of GSM base station crystal oscillator frequency offset automatic correction device described in the present invention is as figure 1 shown. It consists of the following parts: receiving antenna 101; radio frequency receiver 102; baseband processing unit 103; main control unit 104; digital-to-analog conversion unit (DAC) 105; TCXO crystal oscillator 106; temperature sensor 107.

[0041] Among them, the receiving antenna 101 is used for receiving wireless signals; the radio frequency receiver 102 is used for amplification, filtering, frequency mixing and analog-to-digital conversion of radio frequency signals, and the receiver can receive the downlink signal of the base station; the baseband processing unit 103 completes the FCCH channel , and perform frequency offset estimation according to the detected FCCH channel; main control unit 104, as the control core, initiates frequency offset correction, and completes the control of baseband processing unit 103, radio ...

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Abstract

The invention relates to a method for automatically correcting the frequency deviation of a crystal oscillator in a GSM base station, which comprises the following steps: step 1. a linear change relatThe invention relates to a method for automatically correcting the frequency deviation of a crystal oscillator in a GSM base station, which comprises the following steps: step 1. a linear change relationship between a register value configured to a digital-to-analog conversion unit and the frequency deviation value of the crystal oscillator is tested offline; step 2. when preset conditions are sationship between a register value configured to a digital-to-analog conversion unit and the frequency deviation value of the crystal oscillator is tested offline; step 2. when preset conditions are satisfied, the frequency deviation of the crystal oscillator is estimated in the base station; step 3. a benchmark frequency point where the frequency deviation of the crystal oscillator is compensated iisfied, the frequency deviation of the crystal oscillator is estimated in the base station; step 3. a benchmark frequency point where the frequency deviation of the crystal oscillator is compensated is selected; and step 4. the frequency deviation of the crystal oscillator is compensated according to the linear change relationship in the base station, for the purpose of automatically correcting ths selected; and step 4. the frequency deviation of the crystal oscillator is compensated according to the linear change relationship in the base station, for the purpose of automatically correcting the frequency deviation of the crystal oscillator in the GSM base station. The method and the device take the crystal oscillator in other peripheral base stations as a benchmark to realize the automatice frequency deviation of the crystal oscillator in the GSM base station. The method and the device take the crystal oscillator in other peripheral base stations as a benchmark to realize the automatic adjustment of the frequency deviation of a TCXO crystal oscillator in the base station. By the automatic adjustment of the frequency deviation, the clock frequency of the base station keeps consistenadjustment of the frequency deviation of a TCXO crystal oscillator in the base station. By the automatic adjustment of the frequency deviation, the clock frequency of the base station keeps consistent with that in other peripheral base stations; therefore, the application of the TCXO crystal oscillator in base station design is possible.t with that in other peripheral base stations; therefore, the application of the TCXO crystal oscillator in base station design is possible.

Description

technical field [0001] The invention relates to a GSM base station, in particular to a method and device for automatically correcting the crystal oscillator frequency deviation of the GSM base station. Background technique [0002] In the field of wireless communication, the base station crystal oscillator is the source of the base station clock, and the clock accuracy generated by the base station crystal oscillator has a great impact on the performance of the base station, such as demodulation performance and switching. When the clock frequency deviation generated by the crystal oscillator of the base station is large, the demodulation performance of the base station will be deteriorated sharply, and the mobile phone cannot be switched between different base stations. [0003] Usually, an OCXO (Oven Controlled Crystal Oscillator, Oven Controlled Crystal Oscillator) crystal oscillator with better performance indicators is selected as the system crystal oscillator in base st...

Claims

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Application Information

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IPC IPC(8): H04B7/01H04W88/08
Inventor 卢勤博王剑崔亦军
Owner 郝亚敏
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