WO2016082606A1 - Procédé et appareil de correction de décalage de fréquence - Google Patents

Procédé et appareil de correction de décalage de fréquence Download PDF

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Publication number
WO2016082606A1
WO2016082606A1 PCT/CN2015/090037 CN2015090037W WO2016082606A1 WO 2016082606 A1 WO2016082606 A1 WO 2016082606A1 CN 2015090037 W CN2015090037 W CN 2015090037W WO 2016082606 A1 WO2016082606 A1 WO 2016082606A1
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WO
WIPO (PCT)
Prior art keywords
downlink
doppler shift
user equipment
value
uplink
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Application number
PCT/CN2015/090037
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English (en)
Chinese (zh)
Inventor
袁晓超
霍燚
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中兴通讯股份有限公司
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Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2016082606A1 publication Critical patent/WO2016082606A1/fr

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    • 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements

Definitions

  • the present invention relates to the field of communications, and in particular to a frequency offset correction method and apparatus.
  • the base station site configuration is adopted in the place where the high-speed rail track is close.
  • the distance between the base station sites is relatively close in the current third-generation mobile communication system, and the coverage and handover of the base station is countered by the MRRU scenario. Not timely.
  • this high-speed rail scene still has certain problems, mainly because the speed of the high-speed rail has reached a speed of more than 300km/h, and the Doppler shift is far greater under the high motion state of the user equipment UE.
  • the Doppler shift in the general urban scene is simply by reducing the distance between the base stations and adopting the MRRU scene and not completely resisting the Doppler shift in the high-speed moving state.
  • the Doppler shift for this high-speed scene has not been processed in the downlink transmission signal, so that the terminal is receiving downlink in the high-speed railway scenario. There is a risk of downlink performance degradation when the signal is transmitted, resulting in downlink signal synchronization, coverage and seamless handover performance degradation.
  • the embodiment of the present invention provides a frequency offset.
  • the calibration method and device are used to solve the above technical problems.
  • the present invention provides a frequency offset correction method, wherein the method includes: demodulating an uplink signal of a received user equipment; and based on a demodulation result, according to a Doppler frequency shift The formula calculates the downlink Doppler shift value; when performing the downlink signal transmission, the frequency offset correction is performed in advance according to the downlink Doppler shift value.
  • the demodulation result is an uplink Doppler shift value and a phase value of the user equipment.
  • the Doppler shift formula includes: an upward Doppler shift formula: Wherein, the uplink Doppler shift fd value, V is the running speed of the user equipment, C is the speed of light, f is the frequency of the uplink of the user equipment, [theta] is the phase value of the user equipment; downlink multiple Puller frequency shift formula: Where f is the frequency of the downlink of the user equipment, the downlink fd is the Doppler shift value.
  • calculating, according to the demodulation result of the uplink signal, the downlink Doppler frequency shift value according to the Doppler frequency shift formula including: based on the uplink Doppler frequency shift value and the phase value, according to the The uplink Doppler shift formula calculates the running speed of the user equipment; and based on the operating speed of the user equipment, calculates the downlink Doppler shift value according to the downlink Doppler shift formula.
  • the present invention further provides a frequency offset correction apparatus, wherein the apparatus comprises: a signal demodulation module configured to demodulate an uplink signal of a received user equipment; and a calculation module And being set to calculate a downlink Doppler shift value according to the Doppler shift formula based on the demodulation result; the frequency offset correction module is configured to advance according to the downlink Doppler shift value when performing downlink signal transmission Perform frequency offset correction.
  • the apparatus comprises: a signal demodulation module configured to demodulate an uplink signal of a received user equipment; and a calculation module And being set to calculate a downlink Doppler shift value according to the Doppler shift formula based on the demodulation result; the frequency offset correction module is configured to advance according to the downlink Doppler shift value when performing downlink signal transmission Perform frequency offset correction.
  • the demodulation result is an uplink Doppler shift value and a phase value.
  • the Doppler shift formula includes: an upward Doppler shift formula: Wherein, the uplink Doppler shift fd value, V is the running speed of the user equipment, C is the speed of light, f is the frequency of the uplink of the user equipment, [theta] is the phase value of the user equipment; downlink multiple Puller frequency shift formula: Where f is the frequency of the downlink of the user equipment, the downlink fd is the Doppler shift value.
  • the calculating module includes: a first calculating unit, configured to calculate the user equipment according to the uplink Doppler frequency shift formula based on the uplink Doppler frequency shift value and the phase value
  • the running speed of the second computing unit is set to calculate the downlink Doppler shift value according to the downlink Doppler shift formula based on the running speed of the user equipment.
  • the invention can achieve better downlink signal synchronization by correcting the Doppler frequency shift of the downlink signal in advance in the high-speed railway scenario, thereby improving downlink coverage, improving the success rate of seamless handover, and reducing the dropped call rate.
  • FIG. 1 is a flow chart of a frequency offset correction method according to an embodiment of the present invention.
  • FIG. 2 is a flowchart of a method for improving downlink coverage and improving seamless handover success rate according to an embodiment of the present invention
  • FIG. 3 is a block diagram showing the structure of a frequency offset correction apparatus according to an embodiment of the present invention.
  • the present invention provides a frequency offset. Correction Method and Apparatus The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
  • This embodiment provides a frequency offset correction method, which can be implemented on the network side, and is mainly applied to high-speed mobile scenes such as high-speed rail.
  • 1 is a flow chart of a frequency offset correction method according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps (step S102 - step S106):
  • Step S102 The network side demodulates the received uplink signal of the user equipment.
  • Step S104 the network side calculates a downlink Doppler shift value according to the Doppler shift formula based on the demodulation result.
  • the demodulation result is an uplink Doppler shift value and a phase value.
  • Step S106 The baseband processing unit on the network side performs frequency offset correction in advance according to the downlink Doppler frequency shift value when performing downlink signal transmission.
  • the above Doppler shift formula includes:
  • Upward Doppler shift formula wherein, the uplink Doppler shift fd value, V is the running speed of the user equipment, C is the speed of light, f is the frequency of the uplink user equipment, [theta] is the phase value of the user equipment;
  • Downstream Doppler shift formula Where f is the frequency of the user equipment downlink, the downlink fd is the Doppler shift value.
  • the network side calculates the downlink Doppler shift value according to the Doppler shift formula based on the demodulation result, including: the uplink Doppler shift value and the phase value obtained by demodulating the uplink signal, According to the uplink Doppler shift formula, the running speed of the user equipment is calculated; based on the running speed of the user equipment, the downlink Doppler shift value is calculated according to the downlink Doppler frequency shift formula. This provides data support for subsequent frequency offset correction.
  • the invention provides a method for improving the downlink coverage of high-speed rail and the success rate of seamless handover, comprising the following steps:
  • the network side receives the uplink signal of the user equipment UE, performs frequency offset estimation and phase estimation on the uplink signal, and obtains an uplink Doppler frequency shift value (also referred to as a frequency offset value) and a phase value of the uplink signal. .
  • the frequency offset value of the uplink signal can be expressed by the following formula:
  • f d is the uplink Doppler shift
  • V is the operating speed of the user equipment UE
  • C is the speed of light
  • f is the uplink frequency of the user equipment UE
  • ⁇ is the phase value of the user equipment UE.
  • the network side receiving the uplink signal from the user equipment can demodulate the value f D and ⁇ , while the uplink frequency f C with the speed of light is a known value, it is possible to (1) calculate the user equipment UE in accordance with the above formula The speed of operation V.
  • V is the running speed of the user equipment UE
  • C is the speed of light
  • f is the frequency of the user equipment UE downlink
  • [theta] is the phase value of the user equipment UE.
  • V and ⁇ can be directly used as the values of the upward Doppler shift formula (1).
  • the network side performs demodulation, frequency offset estimation, phase estimation after receiving the uplink signal, and then the time interval between the modulation and transmission of the downlink signal is very short, which is generally calculated in units of slots.
  • the V and ⁇ values received based on the uplink signal can be directly used to estimate the downlink Doppler shift value.
  • the baseband processing unit performs the Doppler shift correction of the downlink signal in advance, so that the downlink transmit signal and the user on the high-speed rail have The same Doppler shift achieves better downlink signal synchronization, improves downlink coverage, improves seamless handover success rate, and reduces dropped calls.
  • FIG. 2 is a flowchart of a method for improving downlink coverage and improving seamless handover success rate according to an embodiment of the present invention. As shown in FIG. 2, the method includes the following steps:
  • Step S201 The network side performs uplink signal demodulation, frequency offset estimation, and phase estimation according to the received uplink signal of the user equipment UE.
  • Step S202 The network side reversely derives the operating speed of the user equipment UE according to the frequency offset estimation value and the phase estimation value of the uplink signal obtained in step S101 by using the Doppler frequency shift formula (1).
  • Step S203 The network side extracts the downlink Doppler frequency shift value according to the Doppler frequency shift formula (2) according to the operating speed, phase estimation value, downlink frequency, and light speed of the user equipment UE obtained in step S102.
  • Step S204 The baseband processing unit on the network side performs frequency correction in advance according to the downlink Doppler frequency shift value calculated in step S103 when performing downlink signal transmission, and improves the synchronization success rate of the downlink signal.
  • step S201 the frequency offset estimation value obtained by demodulating the uplink signal on the network side is also the uplink Doppler frequency shift value, because in the high-speed rail scenario, the frequency offset estimation value of the uplink signal is mainly due to Doppler frequency. Move caused.
  • step S203 the downlink Doppler shift value is estimated in advance on the network side, and the operation speed and the phase estimation value of the user equipment UE in step S202 are directly calculated in the calculation, mainly considering that the network side is in the uplink signal.
  • Demodulation processing to downlink signal transmission the baseband processing unit on the network side has a short time in this part, and is calculated in units of slots. In such a short time, the operating speed and phase of the user equipment UE are basically unchanged. Therefore, it can be directly used to estimate the Doppler shift value of the downlink signal.
  • step S204 the network side performs the Doppler shift correction of the downlink signal in advance in the baseband processing unit, so that the downlink transmission signal has the same Doppler frequency shift as the user on the high-speed rail, so as to achieve better downlink signal synchronization.
  • FIG. 3 is a structural block diagram of a frequency offset correction apparatus according to an embodiment of the present invention. As shown in FIG. 3, the apparatus includes a signal demodulation module 10, a calculation module 20, and a frequency offset correction module 30. The structure is described in detail below.
  • the signal demodulation module 10 is configured to demodulate the received uplink signal of the user equipment
  • the calculation module 20 is connected to the signal demodulation module 10, and is configured to calculate a downlink Doppler shift value according to the Doppler shift formula based on the demodulation result; wherein the demodulation result is an uplink Doppler shift value And phase values.
  • the frequency offset correction module 30 is connected to the calculation module 20 and configured to perform frequency offset correction in advance according to the downlink Doppler shift value when performing downlink signal transmission.
  • the Doppler shift formula includes:
  • Upward Doppler shift formula wherein, the uplink Doppler shift fd value, V is the running speed of the user equipment, C is the speed of light, f is the frequency of the uplink user equipment, [theta] is the phase value of the user equipment;
  • Downstream Doppler shift formula Where f is the frequency of the user equipment downlink, the downlink fd is the Doppler shift value.
  • the calculation module 20 includes: a first calculating unit configured to calculate an operating speed of the user equipment according to an uplink Doppler shift formula based on an uplink Doppler shift value and a phase value;
  • the calculating unit is configured to calculate a downlink Doppler shift value according to a running Doppler frequency shift formula based on a running speed of the user equipment.
  • the device provided by the embodiment of the invention improves the downlink coverage by correcting the downlink Doppler frequency in advance, and improves the seamless handover success rate.
  • it may be a base station.
  • the network side receives the uplink signal demodulation of the user equipment UE to obtain the frequency offset estimation value and the phase estimation value, and the baseband processing unit inversely derives the downlink Doppler frequency shift value according to the Doppler frequency shift formula, thereby
  • the network side can make correction for the downlink Doppler shift in advance.
  • the invention can extract and correct the downlink Doppler frequency shift in the high-speed mobile scene, thereby improving the synchronization success rate of the downlink signal, improving the downlink coverage, improving the seamless handover success rate, and reducing the call drop rate.
  • the invention can achieve better downlink signal synchronization by correcting the Doppler frequency shift of the downlink signal in advance in the high-speed railway scenario, thereby improving downlink coverage, improving the success rate of seamless handover, and reducing the dropped call rate.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil de correction de décalage de fréquence. Le procédé consiste : à démoduler un signal de liaison montante reçu d'un équipement utilisateur ; à réaliser un calcul sur la base d'un résultat de démodulation et selon une formule de décalage de fréquence par effet Doppler pour obtenir une valeur de décalage de fréquence par effet Doppler de liaison descendante ; et durant l'émission d'un signal de liaison descendante, à réaliser une correction de décalage de fréquence à l'avance selon la valeur de décalage de fréquence par effet Doppler de liaison descendante. Au moyen de la présente invention, un problème dans l'état de la technique selon lequel, dans un scénario de déplacement à vitesse élevée, un décalage de fréquence par effet Doppler relativement important se produit, entraînant un échec de synchronisation dans une liaison descendante et un échec d'un transfert intercellulaire aisé, et entraînant en outre un abandon d'appel, est résolu, permettant ainsi d'améliorer la couverture de liaison descendante, d'améliorer un taux de réussite de transferts intercellulaires sans interruption, et de réduire un taux d'abandon d'appel.
PCT/CN2015/090037 2014-11-24 2015-09-18 Procédé et appareil de correction de décalage de fréquence WO2016082606A1 (fr)

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CN201410680360.0 2014-11-24
CN201410680360.0A CN105704076A (zh) 2014-11-24 2014-11-24 一种频偏校正方法及装置

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Cited By (2)

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CN108696945A (zh) * 2018-05-11 2018-10-23 西安空间无线电技术研究所 一种面向低轨卫星通信系统的随机接入方法
CN110943773A (zh) * 2019-11-26 2020-03-31 中国电子科技集团公司第五十四研究所 一种适用于固定翼飞机平台的卫星广播解调装置

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CN112394325B (zh) * 2019-08-16 2023-11-28 苏州触达信息技术有限公司 一种超声定位信号的多普勒频偏估算系统、方法和装置
CN113365349B (zh) * 2020-03-05 2023-07-04 大唐移动通信设备有限公司 一种信号的传输方法、终端、网络设备和存储介质

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US20040203395A1 (en) * 2002-06-20 2004-10-14 Dmitry Chizhik Slowing the observed rate of channel fluctuations in a multiple antenna system
US20140003403A1 (en) * 2005-12-09 2014-01-02 Neocific, Inc. Frequency correction in a multi-carrier communication system
CN101719771A (zh) * 2009-11-30 2010-06-02 华为技术有限公司 频偏处理方法和系统以及直放站
CN102957461A (zh) * 2011-08-22 2013-03-06 鼎桥通信技术有限公司 下行信号发送方法及无线通信系统

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Publication number Priority date Publication date Assignee Title
CN108696945A (zh) * 2018-05-11 2018-10-23 西安空间无线电技术研究所 一种面向低轨卫星通信系统的随机接入方法
CN108696945B (zh) * 2018-05-11 2020-08-14 西安空间无线电技术研究所 一种面向低轨卫星通信系统的随机接入方法
CN110943773A (zh) * 2019-11-26 2020-03-31 中国电子科技集团公司第五十四研究所 一种适用于固定翼飞机平台的卫星广播解调装置

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