WO2009052716A1 - Procédé et terminal mobile pour éliminer une déviation de fréquence - Google Patents

Procédé et terminal mobile pour éliminer une déviation de fréquence Download PDF

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Publication number
WO2009052716A1
WO2009052716A1 PCT/CN2008/072156 CN2008072156W WO2009052716A1 WO 2009052716 A1 WO2009052716 A1 WO 2009052716A1 CN 2008072156 W CN2008072156 W CN 2008072156W WO 2009052716 A1 WO2009052716 A1 WO 2009052716A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency offset
crystal oscillator
controlled crystal
mobile terminal
voltage controlled
Prior art date
Application number
PCT/CN2008/072156
Other languages
English (en)
Chinese (zh)
Inventor
Lin XUE
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009052716A1 publication Critical patent/WO2009052716A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70715—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with application-specific features
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0016—Stabilisation of local oscillators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset
    • H04L2027/0036—Correction of carrier offset using a recovered symbol clock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0063—Elements of loops
    • H04L2027/0065—Frequency error detectors

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method for eliminating frequency offset and a mobile terminal. Background technique
  • the base station on the network side uses a high-stability temperature-compensated crystal oscillator as the working clock source, and its frequency stability usually reaches 0.05.
  • Ppm part per million, parts per million
  • VCXO Voltage-Controlled Crystal Oscillator
  • its frequency stability is generally only about 5 ppm.
  • the mobile terminal also generates a Doppler shift in the case of high-speed movement.
  • the frequency offset of the mobile terminal relative to the base station generally includes two parts: one part is the carrier frequency offset between the down-conversion radio frequency carrier generated by the mobile terminal VCX0 and the downlink carrier sent by the base station; the other part is the sampling clock frequency generated by the mobile terminal VCX0. Partial. For example, for a 2 GHz carrier used in a WCDMA system, the frequency stability of the mobile terminal VCXO lppm will result in a carrier frequency offset of 2 kHz, while the 15.36 MHz sample clock has a 15.36 Hz sampling frequency offset.
  • the above two partial frequency offsets are generally relatively large when the mobile terminal is powered on, at around 2 kHz.
  • the carrier frequency offset will cause the signal-to-noise ratio of the cell search to deteriorate, and the probability of cell search failure will increase; the frequency offset of the sample will cause the searched radio frame real-band boundary and frame boundary to deviate from the correct position.
  • the mobile terminal can use the following method to eliminate the frequency offset, that is, by establishing synchronization with the network side, and using the network downlink reference channel for frequency locking, so that the frequency stability of the mobile terminal is controlled within O.lppm.
  • the prior art proposes a method for calibrating the initial bias voltage of the VCXO of each mobile terminal during the manufacturing process of the mobile terminal, and obtaining the VCXO required to generate the nominal frequency at different temperatures.
  • the initial bias voltage value table (referred to as a configuration table) stores the configuration table in the memory of the mobile terminal. After the mobile terminal is turned on, query the configuration table according to the temperature measured at the time of power-on, find the bias voltage for controlling the VCXO, and calibrate the operating frequency of the VCXO.
  • the bias voltage of the VCXO will cause the actual frequency offset to increase.
  • the prior art also has a solution to the problem that the phase error accumulated by the frequency offset causes the cell search to fail.
  • the mobile terminal uses the PSCH (Primary Synchronous Channel) of WCDMA to estimate the frequency offset of the VCXO, and adjusts the bias voltage of the VCXO according to the frequency offset estimation amount to achieve elimination.
  • PSCH Primary Synchronous Channel
  • the disadvantage of this method is that the accuracy of the frequency offset estimation is not high, especially in the case of a relatively harsh wireless channel environment, which is affected by noise and interference, and the accuracy of the frequency offset estimation is more limited, and the frequency offset cannot be effectively eliminated.
  • the embodiment of the invention provides a method for eliminating frequency offset and a mobile terminal, so as to eliminate the frequency offset when the mobile terminal is initially powered on, and improve the probability of successful initial cell search.
  • a method for eliminating frequency offset comprising: receiving a GPS satellite signal to obtain time information;
  • a mobile terminal includes:
  • a GPS receiving module configured to receive a GPS satellite signal, and obtain time information
  • a first frequency offset estimating module configured to perform frequency offset estimation on the voltage controlled crystal oscillator of the mobile terminal according to the time information
  • a bias voltage adjustment module for adjusting a bias voltage of the voltage controlled crystal oscillator of the mobile terminal according to a frequency offset of the voltage controlled crystal oscillator
  • a frequency offset calibration module that controls the operating frequency of the voltage controlled crystal oscillator using the adjusted bias voltage.
  • the embodiment of the present invention eliminates the frequency offset of the mobile terminal at the initial startup by utilizing the GPS (Global Positioning System) signal with high frequency stability, and improves the probability of successful initial cell search.
  • GPS Global Positioning System
  • FIG. 2 is a schematic diagram of an apparatus according to an embodiment of the present invention. detailed description
  • the embodiment of the present invention provides a method for eliminating frequency offset.
  • the method includes the following steps: Step 101: Receive a GPS satellite signal to obtain timing information.
  • the frequency stability of the satellite can reach O.OOlppm, and the accuracy of the timing information received by the mobile terminal can reach
  • Step 102 Output a timing pulse signal according to the timing information.
  • the timing pulse signal can reach IPPS (One Pulse Per Second), which is a pulse signal with a width of 50 ns per second.
  • Step 103 Perform frequency offset estimation on the VCXO of the mobile terminal by using the timing pulse signal Count.
  • the method for performing frequency offset estimation may be: using the timing pulse signal as a count control signal, measuring a number of VCXO output clocks in a statistical period, and obtaining a number of VCXO output clocks measured in the statistical period to obtain a mobile terminal The frequency offset of VCXO.
  • the mobile terminal can be calculated by N ⁇ ⁇ ⁇
  • ⁇ is the number of VCXO output clocks obtained for the first measurement
  • w is the number of repeated measurements, F ⁇ .
  • ⁇ is the frequency offset of the VCXO of the mobile terminal.
  • Steps 104 and 4 adjust the bias voltage of the VCXO of the mobile terminal according to the frequency offset of the VCXO.
  • Step 105 Control the operating frequency of the VCXO by using the adjusted bias voltage to eliminate the frequency offset of the VCXO.
  • Step 106 Perform frequency offset estimation on the VCXO after the frequency offset calibration by using the timing pulse signal.
  • the method for estimating the frequency offset is the same as the method of step 103, and details are not described herein again.
  • Step 107 when the frequency offset of the VCXO.
  • the initial cell search is performed; when the VCXO is frequency offset.
  • it is greater than or equal to the preset frequency offset perform step 104 until the VCXO frequency offset.
  • the method may further comprise the steps of:
  • the adjusted bias voltage value is saved, and the adjusted bias voltage value is used as the initial bias voltage of the mobile terminal VCXO. In this way, when the mobile terminal VCXO is powered on for the next time, or after the first frequency offset adjustment is performed by using the above embodiment, the frequency offset of the VCXO is small, and the time for eliminating the frequency offset is shortened.
  • the embodiment of the invention further provides a mobile terminal, as shown in FIG. 2, comprising: GPS The receiving module 21, the first frequency offset estimating module 22, the bias voltage adjusting module 23, the frequency offset calibration module 24, the second frequency offset estimating module 25, and the determining module 26.
  • the GPS receiving module 21 is configured to receive a GPS satellite signal and obtain timing information.
  • the frequency stability of the satellite can reach O.OOlppm, and the timing information received by the mobile terminal can reach 0.005ppm.
  • the first frequency offset estimation module 22 is configured to perform frequency offset estimation on the VCXO of the mobile terminal according to the time information.
  • the first frequency offset estimation module 22 includes: a timing pulse signal module, configured to output a timing pulse signal according to the timing information; and a first frequency offset estimation submodule, configured to use the timing pulse signal to the mobile terminal
  • the voltage controlled crystal oscillator performs frequency offset estimation.
  • the timing pulse signal can reach 1PPS (One Pulse Per Second), which is a pulse signal with a width of 50ns per second.
  • the first frequency offset estimation sub-module includes: a measurement module, configured to use the timing pulse signal as a count control signal to measure a number of VCXO output clocks in a statistical period; and a frequency offset calculation module, configured to perform statistics according to the The number of VCXO output clocks measured during the period is calculated, and the frequency offset of the VCXO of the mobile terminal is calculated.
  • the frequency offset calculation module may be a first frequency offset calculation module, configured according to a formula
  • the bias voltage adjustment module 23 is configured to adjust a bias voltage of the VCXO of the mobile terminal according to a frequency offset of the VCXO.
  • the adjusted VCXO bias voltage is v o + AV vcxo , where .
  • the frequency offset calibration module 24 is configured to control the operating frequency of the VCXO by using the adjusted bias voltage to eliminate the frequency offset of the VCXO.
  • the second frequency offset estimation module 25 is configured to use the timing pulse signal to frequency offset
  • the calibrated VCXO performs frequency offset estimation.
  • the second frequency offset estimation module 25 and the first frequency offset estimation module 22 may be two independent modules, or may be combined into one module, or two independent parts of one module.
  • the determining module 26 is configured to determine a frequency offset of the VCXO. Is it less than the preset frequency offset? When the frequency offset of the VCXO is ⁇ «. When less than the preset frequency offset threshold ⁇ , the cell search module 27 is notified to perform an initial cell search; when the frequency offset of the VCXO is greater than or equal to a preset frequency offset threshold ⁇ , the bias voltage adjustment module 23 is notified according to the bias voltage adjustment module 23 The calibrated frequency offset adjusts the bias voltage of the mobile terminal VCXO, and the frequency offset calibration module 24 recalibrates the frequency offset of the VCXO until the frequency offset of the VCXO is ⁇ «. Less than the preset frequency offset value ⁇ .
  • the mobile terminal may further include: a cell search module 27, configured to perform an initial cell search when the frequency offset of the VCXO is less than a preset frequency offset threshold.
  • the mobile terminal may further include: a setting module, configured to save the adjusted bias voltage value, and use the adjusted bias voltage value as an initial bias voltage of the mobile terminal VCXO.
  • a setting module configured to save the adjusted bias voltage value, and use the adjusted bias voltage value as an initial bias voltage of the mobile terminal VCXO.
  • the embodiments of the present invention can be applied to mobile terminals of WCDMA systems and other 2G or 3G systems.
  • the frequency offset of the mobile terminal at the initial startup is eliminated by using the GPS signal with high frequency stability, and the probability of successful initial cell search is improved.
  • the present invention can be implemented by hardware or by software plus a necessary general hardware platform.
  • the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

Abstract

Procédé pour éliminer une déviation de fréquence comprenant les étapes suivantes : un signal de satellite GPS est reçu et des informations temporelles sont obtenues ; l'estimation de la déviation de fréquence est effectuée au moyen d'un oscillateur à quartz contrôlé en tension d'un terminal mobile, selon les informations temporelles ; une tension de polarisation de l'oscillateur à quartz contrôlé en tension du terminal mobile est ajustée selon la déviation de fréquence de l'oscillateur à quartz contrôlé en tension ; la fréquence de travail de l'oscillateur à quartz contrôlé en tension est commandée au moyen de la tension de polarisation ajustée. Le terminal mobile est utilisé pour mettre en œuvre le procédé.
PCT/CN2008/072156 2007-10-22 2008-08-27 Procédé et terminal mobile pour éliminer une déviation de fréquence WO2009052716A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNA2007101240661A CN101150330A (zh) 2007-10-22 2007-10-22 一种消除频偏的方法及移动终端
CN200710124066.1 2007-10-22

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WO2009052716A1 true WO2009052716A1 (fr) 2009-04-30

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CN (1) CN101150330A (fr)
WO (1) WO2009052716A1 (fr)

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CN113419414A (zh) * 2021-07-13 2021-09-21 贵州省计量测试院 一种具有gnss驯服和间隔时间保持能力的标准计时系统
CN117527497A (zh) * 2024-01-05 2024-02-06 中国电力科学研究院有限公司 频偏校准方法、装置、电子设备和存储介质

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CN101150330A (zh) * 2007-10-22 2008-03-26 华为技术有限公司 一种消除频偏的方法及移动终端
US8558738B2 (en) * 2008-05-22 2013-10-15 Novatel Inc. GNSS receiver using signals of opportunity and assistance information to reduce the time to first fix
CN102062817B (zh) * 2009-11-13 2015-05-20 中兴通讯股份有限公司 用于电子产品的晶体振荡器的频偏检测方法和装置
CN102073055B (zh) * 2010-11-03 2012-09-19 东南大学 Gps接收机中温度补偿晶体振荡器固定偏差的测试方法
CN102158950A (zh) * 2011-04-26 2011-08-17 上海华为技术有限公司 时钟同步方法、系统、装置及基站
CN102185627B (zh) * 2011-05-06 2014-11-12 京信通信系统（中国）有限公司 一种在td-scdma制式下的频率校准方法及装置
CN103023433B (zh) * 2012-12-27 2015-06-24 无锡中星微电子有限公司 改进型高精度振荡器
CN103117980B (zh) * 2013-01-31 2016-01-13 南京正保通信网络技术有限公司 用于正交频分复用接收机的快速数字自动频率控制方法
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CN106603167B (zh) * 2015-10-15 2020-03-27 普天信息技术有限公司 一种终端的占空比与输出频率对应关系表校正的方法和装置
CN106549720A (zh) * 2016-10-13 2017-03-29 广东欧珀移动通信有限公司 一种改善移动终端射频频偏的方法和移动终端
CN108390732A (zh) * 2018-01-04 2018-08-10 晶晨半导体(上海)股份有限公司 一种通过射频信号来校准晶体偏振的方法
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