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Method for calibrating frequency of HF-oscillator in mobile part of mobile communication device

A technology of mobile communication equipment and high-frequency oscillators, which is applied to automatic frequency control components, communication between multiple stations, electrical characteristic frequency control, etc., can solve expensive problems and achieve the effect of improving accuracy

Inactive Publication Date: 2006-08-09
辛特里昂无线电模块有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is also expensive

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  • Method for calibrating frequency of HF-oscillator in mobile part of mobile communication device
  • Method for calibrating frequency of HF-oscillator in mobile part of mobile communication device
  • Method for calibrating frequency of HF-oscillator in mobile part of mobile communication device

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Embodiment Construction

[0023] For example with the help of the application in the UMTS standard figure 1 method shown. In UMTS, synchronization with an accuracy of + / -3 parts per million is required with respect to the carrier frequency used in order to perform the subsequent time synchronization. The average component spuriousness of a production series of HF oscillators is typically + / -25 parts per million in terms of natural frequency. This is then reduced to + / - 3 parts per million component spurs by automatic frequency calibration as described below. A signal 4 transmitted by a base station (not shown) is received in a receiver 5 by the mobile part 1 of the mobile communication device. The transmitted signal 4 comes from the baseband of the base station, which is located around approximately 2.1 GHz. The received signal 4 is demodulated by known means, and the signal 6 thus demodulated is compared within the evaluation and synchronization procedure 3 by means of a correlator with a pSCH sequ...

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Abstract

The invention relates to a method for calibrating the frequency of an HF-oscillator (2) in a mobile part (1) of a mobile communications device when the mobile communications device is switched on for the first time. The method comprises the following steps: sampling a modulated carrier which is transmitted by a base station and which has a predetermined frequency precision, by means of a frequency search algorithm; determining the frequency error by comparing the frequency that is found with a channel raster of the base station already known to the mobile communications device; synchronising the mobile communications device with the modulated support; and adopting the frequency corrected by the frequency error as the reference frequency.

Description

technical field [0001] The invention relates to a method for calibrating the frequency of an HF (high frequency) oscillator in a mobile part of a mobile communication device when the mobile part is switched on for the first time, having the steps of: a) scanning the signals sent from the base station and having a modulated carrier wave of predetermined frequency accuracy, b) finding the frequency error between the frequency of the high frequency oscillator in the mobile part of the mobile communication device and a known base station channel frequency, c) synchronizing said mobile communication device to on the modulated carrier. Background technique [0002] Such a method is known from EP 0735675 A2, in which the sequence error is continuously determined by extending the search range for the base station frequency until the frequency of the base station is found. Although the channel frequency of the base station is known in principle, it is not known on the part of the mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03J1/00H03J7/04H04B1/40H04B7/26
CPCH03J1/0066H03J7/04
Inventor B·比内克A·法尔肯伯格S·卡格尔T·克罗伊尔A·昆茨H·兰登伯格
Owner 辛特里昂无线电模块有限责任公司