WO2013110225A1 - Frequency offset compensation method and device - Google Patents

Frequency offset compensation method and device Download PDF

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Publication number
WO2013110225A1
WO2013110225A1 PCT/CN2012/075315 CN2012075315W WO2013110225A1 WO 2013110225 A1 WO2013110225 A1 WO 2013110225A1 CN 2012075315 W CN2012075315 W CN 2012075315W WO 2013110225 A1 WO2013110225 A1 WO 2013110225A1
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Prior art keywords
frequency offset
input signal
compensation
estimation
perform
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PCT/CN2012/075315
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French (fr)
Chinese (zh)
Inventor
陈继勋
易鸿锋
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中兴通讯股份有限公司
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Publication of WO2013110225A1 publication Critical patent/WO2013110225A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H04L27/266—Fine or fractional frequency offset determination and synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/01—Reducing phase shift
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H04L27/2659—Coarse or integer frequency offset determination and synchronisation
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols

Definitions

  • the second estimating module comprises: a capturing unit configured to perform frequency offset range capturing on the input signal by using a single pilot signal; and a locking unit configured to perform frequency matching on the input signal captured by the frequency offset range by using the dual pilot signal The bias value is locked.
  • the third compensation module comprises: a first compensation unit configured to perform inter-symbol frequency offset compensation on the input signal obtained by the frequency offset value locking; and a second compensation unit configured to input the inter-symbol frequency offset compensation The signal is subjected to intra-symbol frequency offset compensation to obtain a demodulated signal.
  • FIG. 7 is a flowchart of frequency offset estimation in a high-speed rail scenario according to an embodiment of the present invention. As shown in FIG. 7, the process includes the following steps: S702: Perform frequency offset estimation on each antenna, pilot, and UE.
  • FIG. 8 is a flowchart of frequency offset compensation in a high-speed rail scenario according to an embodiment of the present invention. As shown in FIG. 8, the process includes the following steps:
  • the third compensation module 34 includes: a first compensation unit 342 configured to perform inter-symbol frequency offset compensation on the input signal obtained by the frequency offset value locking; a second compensation unit 344 connected to the first compensation unit 342, configured In order to perform intra-symbol frequency offset compensation on the input signal obtained by inter-symbol frequency offset compensation, a demodulated signal is obtained.
  • the frequency offset compensation device provided by the above embodiment is used to perform frequency offset compensation processing on the user signal by using the adaptive frequency offset compensation for the wireless communication system in the high speed motion scene, and solves the problem that the related technology cannot detect the frequency variation range and the correction frequency in real time.

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

Abstract

Disclosed are a frequency offset compensation method and device, the method comprising: when a user equipment (UE) accesses a base station, pre-estimating the frequency offset value of a UE input signal to obtain a Doppler frequency offset value; determining whether the Doppler frequency offset value exceeds a preset threshold; if yes, then compensating the frequency offset for the input signal according to a self-adaptive frequency offset correction algorithm; otherwise, compensating the frequency offset for the input signal according to an uplink dual-pilot frequency offset estimation algorithm. The present invention can detect the frequency variation range in real time, correct the baseband signal phase deviation caused by frequency offset, and further improve baseband demodulation performance and system throughput.

Description

频偏补偿方法及装置 技术领域 本发明涉及通信领域， 具体而言， 涉及一种频偏补偿方法及装置。 背景技术 根据 UIC (Union Internationale des Chemins de fer, 国际铁路联盟） 的数据： 截止 TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a frequency offset compensation method and apparatus. Background Art According to UIC (Union Internationale des Chemins de fer, International Railway Union) data:
2010年 3月，全球投入使用的高铁里程数约为 1.34万公里。在建和计划建设的高铁里 程约为 2.8万公里， 占市场总量的 68%。 预计未来三年内， 全球高速铁路总投资约为 2000亿美元， 其中， 高速铁路系统中的无线通信系统的总投资将超过 80亿美元。 随着无线通信技术的快速发展， 高铁用户对高速率数据业务的需求也会随之剧烈 增长， 但是， 目前的 3G (3rd Generation, 第三代合作伙伴计划） 网络仅能提供较低的 数据速率， 并不能满足未来高速铁路无线通信系统的多业务需求。 因此， 基于 LTE (Long-Term Evolution, 长期演进） 的高铁无线通信解决方案将会成为运营商未来关 注的焦点。 在高速移动场景中， 对 LTE系统性能影响最大的效应是多普勒效应。 当电磁波发 射源与接收器发生相对运动的时候， 接收到的信号的波长因为信号源和接收机的相对 运动而产生变化， 这会导致所接收到的传播频率发生改变。 当运动速度达到一定阀值 时， 将会引起传输频率的明显改变， 称作多普勒效应。 在移动通信系统中， 特别是高 速场景下， 这种效应尤其明显， 多普勒效应所引起的附加频移称为多普勒频移， 可用 下式表示： /d = x vx cos^， 其中， Θ为终端移动方向和信号传播方向的角度， V是 终端运动速度， C为电磁波传播速度， f为载波频率。 对于高速移动的用户， 多普勒频偏往往非常大， 对于基站接收机来说， 估计和发 射机之间的频率误差并完成频率误差校正是接收机必须完成的功能， 否则， 将对系统 的链路性能造成很大影响； 另外， 基站接收机还需要应对频偏快速变化的问题， 保证 能够迅速跟上频偏变化速度并进行有效的补偿。 但是， 目前的相关技术不能在基带层面实时地检测出当前子帧频率偏移的相关信 息， 也不能对频偏造成的基带信号相位偏移予以校正， 从而影响了基带信号的解调性 发明内容 本发明提供一种频偏补偿方法及装置， 以至少解决上述问题。 根据本发明的一个方面， 提供了一种频偏补偿方法， 包括： 当用户设备 （UE)接 入基站时， 对 UE的输入信号进行频偏值预估得到多普勒频偏值； 判断多普勒频偏值 是否超过预先设定的阈值， 如果是， 根据自适应频偏校正算法对输入信号进行频偏补 偿， 否则， 根据上行双导频频偏估计算法对输入信号进行频偏补偿。 优选地， 根据自适应频偏校正算法对输入信号进行频偏补偿， 包括： 对输入信号 进行频偏估计； 对经过频偏估计的输入信号进行频谱补偿。 优选地， 对输入信号进行频偏估计， 包括： 利用预设的单导频信号对输入信号进 行频偏范围捕捉； 利用预设的双导频信号对经过频偏范围捕捉得到的输入信号进行频 偏值锁定。 优选地， 对经过频偏估计的输入信号进行频谱补偿， 包括： 对经过频偏值锁定得 到的输入信号进行符号间频偏补偿； 对经过符号间频偏补偿得到的输入信号进行符号 内频偏补偿， 得到解调信号。 优选地， 自适应频偏校正算法应用于多普勒频偏值的范围为大于 1000HZ。 优选地， 上行双导频频偏估计算法应用于多普勒频偏值的范围为大于等于 -1000HZ, 且小于等于 1000HZ。 根据本发明的另一方面， 提供了一种频偏补偿装置， 包括： 第一估计模块， 设置 为当用户设备 （UE) 接入基站时， 对 UE的输入信号进行频偏值预估得到多普勒频偏 值； 判断模块， 设置为判断多普勒频偏值是否超过预先设定的阈值； 第一补偿模块， 设置为在判断结果为是的情况下，根据自适应频偏校正算法对输入信号进行频偏补偿; 第二补偿模块， 设置为在判断结果为否的情况下， 根据上行双导频频偏估计算法对输 入信号进行频偏补偿。 优选地， 第一补偿模块包括： 第二估计模块， 设置为对输入信号进行频偏估计； 第三补偿模块， 设置为对经过频偏估计的输入信号进行频谱补偿。 优选地， 第二估计模块包括： 捕捉单元， 设置为利用单导频信号对输入信号进行 频偏范围捕捉； 锁定单元， 设置为利用双导频信号对经过频偏范围捕捉得到的输入信 号进行频偏值锁定。 优选地， 第三补偿模块包括： 第一补偿单元， 设置为对经过频偏值锁定得到的输 入信号进行符号间频偏补偿； 第二补偿单元， 设置为对经过符号间频偏补偿得到的输 入信号进行符号内频偏补偿， 得到解调信号。 通过本发明， 采用对处在高速运动场景的无线通信系统使用自适应频偏补偿对用 户信号进行频偏补偿处理的方式， 解决了相关技术不能实时检测频率的变化范围、 校 正频偏造成的基带信号相位偏移的问题， 进而达到了提高基带的解调性能、 系统吞吐 量的效果。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部分， 本发 明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的不当限定。 在附图 中： 图 1是根据本发明实施例的高铁场景下多普勒效应的示意图； 图 2是根据本发明实施例的频偏补偿方法流程图； 图 3是根据本发明实施例的频偏补偿方法的选择示意图； 图 4是根据本发明实施例的普通场景下的频偏补偿方法的流程图； 图 5是根据本发明实施例的高铁场景下的频偏补偿方法的流程图； 图 6是根据本发明实施例的上行链路接收端系统的信号处理示意图； 图 7是根据本发明实施例的高铁场景下的频偏估计流程图； 图 8是根据本发明实施例的高铁场景下的频偏补偿流程图； 图 9是根据本发明实施例的频偏补偿装置的结构框图； 图 10是根据本发明优选实施例的频偏补偿装置的结构框图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在不冲突的 情况下， 本申请中的实施例及实施例中的特征可以相互组合。 图 1是根据本发明实施例的高铁场景下多普勒效应的示意图， 下面结合图 1对高 铁场景下无线通信系统的多普勒效应进行说明。 在高速移动场景中， 与普通场景主要不同点是受多普勒频移的影响比较大。例如， 在频点为 700M, 移动速度为 350Km/h时， 基站侧会受到两倍的多普勒频移的影响， 其最大值约等于 460Hz; 若移动速度为 450Km/h 时， 两倍最大多普勒频偏值约为 590Hz。 目前下行普通场景的上行双导频频偏估计算法的估计范围为 [-1000Hz , 1000Hz], 能保证在频点为 700M情况下， 移动速度小于 450Km/h所引起的多普勒频 偏问题。在频点为 700M, 移动速度为 350Km/h时， UE侧所受到单倍的多普勒频移的 影响， 其最大值约等于 230Hz; 若移动速度为 450Km/h时， 其单倍最大多普勒频偏约 等于 295Hz。 因此， 下行普通场景的上行双导频频偏估计算法能够解决该条件下的高 速移动场景中的多普勒频偏问题。 但是， 在频点位于大于 1G的频段时， 多普勒频偏值多数会超过 1000Hz, 此时， 必须要考虑高铁场景下的频偏估计和频偏补偿算法。目前的高速铁路多采用 LTE网络， LTE网络的优点是可以大幅度提高频谱利用率。 因此， 可以通过在基站上行链路采用 自适应频偏校正方法， 对上行接收数据的频偏进行实时跟踪校正， 从而可以抑制高铁 通信中较大的多普勒频偏所带来的系统解调性能恶化， 保证高铁通信中的网络覆盖质 量， 能够帮助运营商打造出优质的高铁覆盖网络。 图 2是根据本发明实施例的频偏补偿方法选择流程图， 如图 2所示， 该方法主要 包括以下步骤 （步骤 S202-步骤 S204): 步骤 S202, 当用户设备（UE)接入基站时， 对 UE的输入信号进行频偏值预估得 到多普勒频偏值。 步骤 S202, 判断多普勒频偏值是否超过预先设定的阈值， 如果是， 根据自适应频 偏校正算法对输入信号进行频偏补偿， 否则， 根据上行双导频频偏估计算法对输入信 号进行频偏补偿。 其中， 在步骤 S202中， 当多普勒频偏值大于阈值时， 可以根据自适应频偏校正算 法对输入信号进行频偏补偿包括： 对输入信号进行频偏估计； 对经过频偏估计的输入 信号进行频谱补偿。 在本发明实施例的一个优选实施方式中， 对输入信号进行频偏估 计可以包括： 利用预设的单导频信号对输入信号进行频偏范围捕捉， 再利用预设的双 导频信号对经过频偏范围捕捉得到的输入信号进行频偏值锁定； 对经过频偏估计的输 入信号进行频谱补偿可以包括： 对经过频偏值锁定得到的输入信号进行符号间频偏补 偿， 再对经过符号间频偏补偿得到的输入信号进行符号内频偏补偿， 得到解调信号。 在本发明实施例中， 自适应频偏校正算法应用于多普勒频偏值的范围为大于 1000HZ; 上行双导频频偏估计算法应用于多普勒频偏值的范围为大于等于 -1000HZ, 且小于等于 1000HZ。 图 3是根据本发明实施例的频偏补偿方法的选择示意图， 如图 3所示， 高速铁路 上行链路接收端系统选择频偏补偿方法的流程为： 输入信号经过频偏值预估， 当多普 勒频偏值未超过门限值 Dro— th时， 系统采用普通场景下的频偏补偿处理流程； 当超过 门限值 Dro— th时， 系统采用高铁场景下的频偏补偿处理流程。 图 4是根据本发明实施例的普通场景下的频偏补偿方法的流程图， 如图 4所示， 该流程包括： S402, UE接入到基站中。 In March 2010, the number of high-speed rails put into use worldwide was about 13,400 kilometers. The high-speed rail mileage under construction and planned construction is about 28,000 kilometers, accounting for 68% of the total market. It is estimated that the total investment of global high-speed railway will be about 200 billion US dollars in the next three years. The total investment of wireless communication systems in high-speed railway systems will exceed 8 billion US dollars. With the rapid development of wireless communication technology, the demand for high-speed data services by high-speed rail users will also increase dramatically. However, the current 3G (3rd Generation, 3rd Generation Partnership Project) network can only provide lower data rates. It does not meet the multi-service needs of future high-speed railway wireless communication systems. Therefore, high-speed rail wireless communication solutions based on LTE (Long-Term Evolution) will become the focus of operators' future attention. In high-speed mobile scenarios, the most influential effect on LTE system performance is the Doppler effect. When the electromagnetic wave source and the receiver move relative to each other, the wavelength of the received signal changes due to the relative motion of the signal source and the receiver, which causes the received propagation frequency to change. When the speed of movement reaches a certain threshold, it will cause a significant change in the transmission frequency, called the Doppler effect. In mobile communication systems, especially in high-speed scenes, this effect is especially pronounced. The additional frequency shift caused by the Doppler effect is called Doppler shift and can be expressed by: / d = x vx cos^, where , Θ is the angle of the terminal moving direction and the signal propagation direction, V is the terminal moving speed, C is the electromagnetic wave propagation speed, and f is the carrier frequency. For high-speed mobile users, the Doppler frequency offset is often very large. For the base station receiver, estimating the frequency error between the transmitter and the frequency error correction is a function that the receiver must perform. Otherwise, it will be for the system. The link performance has a great impact. In addition, the base station receiver needs to cope with the rapid change of the frequency offset, ensuring that the frequency offset change speed can be quickly followed and effective compensation can be performed. However, the current related technology cannot detect the current sub-frame frequency offset related information in real time at the baseband level, nor can correct the baseband signal phase offset caused by the frequency offset, thereby affecting the demodulation of the baseband signal. SUMMARY OF THE INVENTION The present invention provides a frequency offset compensation method and apparatus to solve at least the above problems. According to an aspect of the present invention, a frequency offset compensation method is provided, including: when a user equipment (UE) accesses a base station, performing a frequency offset value estimation on an input signal of the UE to obtain a Doppler frequency offset value; Whether the Pule frequency offset exceeds a preset threshold, if yes, the input signal is frequency offset compensated according to the adaptive frequency offset correction algorithm; otherwise, the input signal is frequency offset compensated according to the uplink dual pilot frequency offset estimation algorithm. Preferably, performing frequency offset compensation on the input signal according to the adaptive frequency offset correction algorithm comprises: performing frequency offset estimation on the input signal; and performing spectrum compensation on the input signal after frequency offset estimation. Preferably, performing frequency offset estimation on the input signal comprises: capturing a frequency offset range of the input signal by using a preset single pilot signal; and frequency-fetching the input signal captured by the frequency offset range by using a preset dual pilot signal The bias value is locked. Preferably, spectrum compensation is performed on the input signal subjected to the frequency offset estimation, including: performing inter-symbol frequency offset compensation on the input signal obtained by the frequency offset value locking; and performing intra-symbol frequency offset on the input signal obtained by inter-symbol frequency offset compensation Compensation, a demodulated signal is obtained. Preferably, the adaptive frequency offset correction algorithm is applied to the range of Doppler frequency offset values greater than 1000 Hz. Preferably, the uplink dual pilot frequency offset estimation algorithm is applied to the range of the Doppler frequency offset value to be greater than or equal to -1000 Hz and less than or equal to 1000 Hz. According to another aspect of the present invention, a frequency offset compensation apparatus is provided, including: a first estimation module, configured to: when a user equipment (UE) accesses a base station, estimate a frequency offset value of an input signal of the UE. a Pitch frequency offset value; a judging module, configured to determine whether the Doppler frequency offset value exceeds a preset threshold; the first compensation module is set to be based on the adaptive frequency offset correction algorithm when the determination result is yes The input signal performs frequency offset compensation; the second compensation module is configured to perform frequency offset compensation on the input signal according to the uplink dual pilot frequency offset estimation algorithm if the determination result is negative. Preferably, the first compensation module comprises: a second estimation module configured to perform frequency offset estimation on the input signal; and a third compensation module configured to perform spectrum compensation on the input signal subjected to the frequency offset estimation. Preferably, the second estimating module comprises: a capturing unit configured to perform frequency offset range capturing on the input signal by using a single pilot signal; and a locking unit configured to perform frequency matching on the input signal captured by the frequency offset range by using the dual pilot signal The bias value is locked. Preferably, the third compensation module comprises: a first compensation unit configured to perform inter-symbol frequency offset compensation on the input signal obtained by the frequency offset value locking; and a second compensation unit configured to input the inter-symbol frequency offset compensation The signal is subjected to intra-symbol frequency offset compensation to obtain a demodulated signal. The invention adopts a method for performing frequency offset compensation processing on a user signal by using an adaptive frequency offset compensation for a wireless communication system in a high-speed motion scene, and solves the problem that the related technology cannot detect the frequency variation range in real time and correct the frequency offset caused by the baseband. The problem of signal phase shifting achieves the effect of improving the demodulation performance and system throughput of the baseband. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a schematic diagram of a Doppler effect in a high-speed rail scene according to an embodiment of the present invention; FIG. 2 is a flowchart of a frequency offset compensation method according to an embodiment of the present invention; FIG. 3 is a frequency diagram according to an embodiment of the present invention. FIG. 4 is a flowchart of a frequency offset compensation method in a general scenario according to an embodiment of the present invention; FIG. 5 is a flowchart of a frequency offset compensation method in a high-speed rail scenario according to an embodiment of the present invention; 6 is a schematic diagram of signal processing of an uplink receiving end system according to an embodiment of the present invention; FIG. 7 is a flowchart of frequency offset estimation in a high-speed rail scenario according to an embodiment of the present invention; FIG. 8 is a high-speed rail scenario according to an embodiment of the present invention. FIG. 9 is a block diagram showing the structure of a frequency offset compensating apparatus according to an embodiment of the present invention. FIG. 10 is a block diagram showing the structure of a frequency offset compensating apparatus according to a preferred embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. 1 is a schematic diagram of a Doppler effect in a high-speed rail scene according to an embodiment of the present invention. The Doppler effect of a wireless communication system in a high-speed rail scenario will be described below with reference to FIG. In the high-speed moving scene, the main difference from the normal scene is that it is greatly affected by the Doppler shift. For example, when the frequency is 700M and the moving speed is 350Km/h, the base station side will be affected by twice the Doppler shift, and its maximum value is equal to 460Hz; if the moving speed is 450Km/h, it is twice the maximum. The Doppler shift value is approximately 590 Hz. At present, the estimation range of the uplink dual pilot frequency offset estimation algorithm in the downlink common scenario is [-1000 Hz, 1000 Hz], which can ensure the Doppler frequency offset problem caused by the moving speed less than 450 Km/h at the frequency of 700 M. When the frequency is 700M and the moving speed is 350Km/h, the UE side is affected by the single Doppler shift, and its maximum value is approximately equal to 230Hz. If the moving speed is 450Km/h, its single maximum is more than The Pule frequency deviation is approximately equal to 295 Hz. Therefore, the uplink dual pilot frequency offset estimation algorithm of the downlink common scenario can solve the Doppler frequency offset problem in the high speed mobile scene under the condition. However, when the frequency point is in the frequency band greater than 1G, the Doppler frequency offset value will mostly exceed 1000Hz. At this time, the frequency offset estimation and frequency offset compensation algorithm in the high-speed rail scene must be considered. The current high-speed railways mostly use LTE networks. The advantage of LTE networks is that they can greatly improve spectrum utilization. Therefore, the adaptive frequency offset correction method can be used in the uplink of the base station to perform real-time tracking correction on the frequency offset of the uplink received data, thereby suppressing system demodulation caused by large Doppler frequency offset in high-speed rail communication. Deteriorating performance and ensuring the quality of network coverage in high-speed rail communication can help operators to build high-quality high-speed rail coverage networks. 2 is a flow chart of selecting a frequency offset compensation method according to an embodiment of the present invention. As shown in FIG. 2, the method mainly includes the following steps (step S202 - step S204): Step S202: When a user equipment (UE) accesses a base station The frequency offset value of the input signal of the UE is estimated to obtain a Doppler frequency offset value. Step S202, determining whether the Doppler frequency offset value exceeds a preset threshold. If yes, performing frequency offset compensation on the input signal according to the adaptive frequency offset correction algorithm. Otherwise, performing the input signal according to the uplink dual pilot frequency offset estimation algorithm. Frequency offset compensation. In step S202, when the Doppler frequency offset value is greater than the threshold, the frequency offset compensation may be performed on the input signal according to the adaptive frequency offset correction algorithm, including: performing frequency offset estimation on the input signal; and inputting the frequency offset estimation The signal is spectrally compensated. In a preferred embodiment of the present invention, performing frequency offset estimation on the input signal may include: performing frequency offset range capture on the input signal by using a preset single pilot signal, and then using the preset dual pilot signal pair to pass The input signal captured by the frequency offset range is locked by the frequency offset value; the spectrum compensation of the input signal subjected to the frequency offset estimation may include: performing inter-symbol frequency offset compensation on the input signal obtained by the frequency offset value locking, and then The input signal obtained by the frequency offset compensation performs intra-symbol frequency offset compensation to obtain a demodulated signal. In the embodiment of the present invention, the adaptive frequency offset correction algorithm is applied to the Doppler frequency offset value in a range of more than 1000 Hz; the uplink dual pilot frequency offset estimation algorithm is applied to the Doppler frequency offset value in a range of greater than or equal to -1000 Hz, And less than or equal to 1000HZ. 3 is a schematic diagram of selection of a frequency offset compensation method according to an embodiment of the present invention. As shown in FIG. 3, a flow of a frequency offset compensation method for a high-speed railway uplink receiving end system is as follows: When the Doppler frequency offset does not exceed the threshold D ro — th , the system adopts the frequency offset compensation process in the normal scenario; when the threshold D ro — th is exceeded, the system uses the frequency offset compensation process in the high-speed rail scenario. Process. FIG. 4 is a flowchart of a frequency offset compensation method in a common scenario according to an embodiment of the present invention. As shown in FIG. 4, the process includes: S402. A UE accesses a base station.
S404, 基站上行链路预估出上行频偏值。 S404. The uplink frequency offset value is estimated by the base station uplink.
S406, 上行频偏值未超过门限值 DFO— th， 系统采用普通场景下的频偏补偿处理流 程。 图 5是根据本发明实施例的高铁场景下的频偏补偿方法的流程图， 如图 5所示， 该流程包括： S406, the uplink frequency offset value does not exceed the threshold value D FO — th , and the system adopts a frequency offset compensation processing flow in a normal scenario. FIG. 5 is a flowchart of a frequency offset compensation method in a high-speed rail scenario according to an embodiment of the present invention. As shown in FIG. 5, the process includes:
S502, UE接入到基站中。 S502. The UE accesses the base station.
S504, 基站上行链路预估出上行频偏值。 S504. The uplink frequency offset value is estimated by the base station uplink.
S506, 上行频偏值超过门限值1¾0— th， 系统采用高铁场景下的频偏补偿处理流程。 S508, 系统首先利用单导频信号进行频偏范围捕捉， 捕捉到大致的频偏范围。 S510, 系统利用双导频信号进行准确的频偏值锁定。 S506, the uplink frequency offset value exceeds the threshold value of 13⁄4 0 — th , and the system adopts a frequency offset compensation processing procedure in a high-speed rail scenario. S508, the system first uses a single pilot signal to perform frequency offset range capture, and captures a rough frequency offset range. S510, the system uses the dual pilot signal to perform accurate frequency offset lock.
S512, 系统先进行符号间频偏补偿， 然后将接收到的频域数据进行符号内频偏补 偿。 图 6是根据本发明实施例的上行链路接收端系统的信号处理示意图，如图 6所示， 高铁场景下上行链路接收端系统的信号处理通常需要经过频偏范围捕捉、频偏值锁定、 频偏符号间补偿和符号内补偿等步骤。 在实际应用中， 可以先利用单导频信号 （可以 预先设定） 进行频偏范围捕捉， 捕捉到大致的频偏范围， 再利用双导频信号 （可以预 先设定） 进行准确的频偏值锁定。 在实际应用中， 在利用单导频进行频偏范围捕捉时， 可以分别对各天线、 导频和 用户设备做频偏估计：根据上行链路信道对应的信道估计出数据位子载波间的相位差， 从而计算出当前的频偏值， 利用上一帧的频偏估计值对当前估计的频偏值进行滤波， 从而得到需要的导频估计范围。在频偏范围锁定的基础上，利用双导频进行频偏估计: 利用同一帧两导频信道估计值计算当前帧的频偏值， 利用前子帧的频偏估计值对当前 子帧的频偏估计值进行滤波， 从而得到当前估计的频偏值。 在本发明实施例的一个优选实施方式中， 频偏补偿可以包括符号间频偏补偿和符 号内频偏补偿。 其中， 进行符号间频偏补偿时， 利用导频位频偏拉平与线性插值， 然 后再根据获得的非导频位信道估计中存在的频率偏移得到符号间的相位偏转， 从而进 行符号间频偏补偿；在进行符号内频偏补偿时，可以通过 OFDM (Orthogonal Frequency Division Multiple, 正交频分复用） 对接收到的频域数据进行符号内补偿， 首先对接收 到的频域数据进行插值， 如果用户相邻频域资源有其它用户， 则可以在开头和结尾部 分分别添加相邻用户的 M频域值，如果没有相邻用户则补 M个 0，利用滤波器滑动的 方式分别对每个子载波采用相邻的 M个子载波进行干扰消除。 以下结合图 7、 图 8对图 6所示的处理流程进行详细描述。 图 7是根据本发明实施例的高铁场景下的频偏估计流程图， 如图 7所示， 该流程 包括以下步骤： S702, 对各天线、 导频和 UE做频偏估计。 S512, the system first performs inter-symbol frequency offset compensation, and then performs the intra-symbol frequency offset compensation on the received frequency domain data. 6 is a schematic diagram of signal processing of an uplink receiving end system according to an embodiment of the present invention. As shown in FIG. 6, signal processing of an uplink receiving end system in a high-speed rail scenario usually requires frequency offset range capturing and frequency offset value locking. , frequency offset symbol compensation and intra-symbol compensation. In practical applications, you can use a single pilot signal first. Pre-set) Perform frequency offset range capture, capture the approximate frequency offset range, and use the dual pilot signal (can be preset) to perform accurate frequency offset lock. In practical applications, when using a single pilot for frequency offset range capture, frequency offset estimation can be performed separately for each antenna, pilot, and user equipment: the phase difference between data bit subcarriers is estimated according to the channel corresponding to the uplink channel. Therefore, the current frequency offset value is calculated, and the currently estimated frequency offset value is filtered by using the frequency offset estimation value of the previous frame, thereby obtaining a required pilot estimation range. On the basis of the frequency offset range locking, frequency offset estimation is performed by using dual pilots: the frequency offset value of the current frame is calculated by using the same frame two pilot channel estimation values, and the frequency of the current subframe is calculated by using the frequency offset estimation value of the previous subframe. The partial estimate is filtered to obtain the current estimated frequency offset value. In a preferred embodiment of the embodiment of the present invention, the frequency offset compensation may include inter-symbol frequency offset compensation and intra-symbol frequency offset compensation. Wherein, when the inter-symbol frequency offset compensation is performed, the pilot bit-frequency offset is flattened and linearly interpolated, and then the phase shift between the symbols is obtained according to the obtained frequency offset existing in the non-pilot bit channel estimation, thereby performing inter-symbol frequency. Offset compensation; when performing intra-symbol frequency offset compensation, the received frequency domain data can be compensated intra-symbolly by OFDM (Orthogonal Frequency Division Multiple), and the received frequency domain data is first interpolated. If the user has other users in the adjacent frequency domain resource, the M frequency domain value of the adjacent user may be added at the beginning and the end respectively, and if there are no adjacent users, M 0 is added, and the filter sliding method is used for each The subcarriers use adjacent M subcarriers for interference cancellation. The processing flow shown in FIG. 6 will be described in detail below with reference to FIGS. 7 and 8. FIG. 7 is a flowchart of frequency offset estimation in a high-speed rail scenario according to an embodiment of the present invention. As shown in FIG. 7, the process includes the following steps: S702: Perform frequency offset estimation on each antenna, pilot, and UE.
S704, 估计出数据位子载波间的相位差。 S704, estimating a phase difference between the data bit subcarriers.
S706, 计算出当前的频偏值。 S706, calculating a current frequency offset value.
S708, 对获得的频偏值进行滤波。 S708: Filter the obtained frequency offset value.
S710, 获得导频估计范围。 S712, 利用两导频信道估计值计算当前帧的频偏值。 S710, obtaining a pilot estimation range. S712. Calculate a frequency offset value of the current frame by using two pilot channel estimation values.
S714, 对获得的频偏值进行滤波。 S714, filtering the obtained frequency offset value.
S716, 获得当前的频偏值。 图 8是根据本发明实施例的高铁场景下的频偏补偿流程图， 如图 8所示， 该流程 包括以下步骤： S716, obtaining a current frequency offset value. FIG. 8 is a flowchart of frequency offset compensation in a high-speed rail scenario according to an embodiment of the present invention. As shown in FIG. 8, the process includes the following steps:
S802, 利用导频位频偏拉平与线性插值。 S802, using pilot bit frequency offset flattening and linear interpolation.
S804, 获得非导频位信道估计中存在的频率偏移。 S806, 获得符号间的相位偏转。 S804. Obtain a frequency offset existing in the non-pilot bit channel estimation. S806, obtaining phase shift between symbols.
S808, 进行符号间频偏补偿。 S808, performing inter-symbol frequency offset compensation.
S810, 对获得的频偏值进行滤波。 S810, filtering the obtained frequency offset value.
S812, 对接收到的频域数据进行插值。 S812, interpolating the received frequency domain data.
S814, 利用滤波器滑动方式， 进行干扰消除。 采用上述实施例提供的频偏补偿方法， 对处在高速运动场景的无线通信系统使用 自适应频偏补偿对用户信号进行频偏补偿处理， 解决了相关技术不能实时检测频率的 变化范围、 校正频偏造成的基带信号相位偏移的问题， 进而达到了提高基带的解调性 能、 系统吞吐量的效果。 图 9是根据本发明实施例的频偏补偿装置的结构框图， 该装置用以实现上述实施 例提供的频偏补偿方法。 如图 9所示， 该装置主要包括： 第一估计模块 10、 判断模块 20、 第一补偿模块 30以及第二补偿模块 40。 其中， 估计模块 10， 设置为当用户设备 (UE) 接入基站时， 对 UE的输入信号进行频偏值预估得到多普勒频偏值； 判断模块 20， 连接至估计模块 10， 设置为判断多普勒频偏值是否超过预先设定的阈值； 第一补 偿模块 30， 连接至判断模块 20， 设置为在判断结果为是的情况下， 根据自适应频偏校 正算法对输入信号进行频偏补偿； 第二补偿模块 40， 连接至第一补偿模块 30， 设置为 在判断结果为否的情况下， 根据上行双导频频偏估计算法对输入信号进行频偏补偿。 图 10是根据本发明优选实施例的频偏补偿装置的结构框图， 如图 10所示， 在该 装置中， 第一补偿模 30块包括： 第二估计模块 32， 设置为对输入信号进行频偏估计； 第三补偿模块 34，连接至第二估计模块 32， 设置为对经过频偏估计的输入信号进行频 谱补偿。 在本发明实施例的一个优选实施方式中， 第二估计模块 32包括： 捕捉单元 322， 设置为利用单导频信号对输入信号进行频偏范围捕捉； 锁定单元 324， 连接至捕捉单 元 322， 设置为利用双导频信号对经过频偏范围捕捉得到的输入信号进行频偏值锁定。 优选地， 第三补偿模块 34包括： 第一补偿单元 342， 设置为对经过频偏值锁定得到的 输入信号进行符号间频偏补偿； 第二补偿单元 344， 连接至第一补偿单元 342， 设置为 对经过符号间频偏补偿得到的输入信号进行符号内频偏补偿， 得到解调信号。 采用上述实施例提供的频偏补偿装置， 对处在高速运动场景的无线通信系统使用 自适应频偏补偿对用户信号进行频偏补偿处理， 解决了相关技术不能实时检测频率的 变化范围、 校正频偏造成的基带信号相位偏移的问题， 进而达到了提高基带的解调性 能、 系统吞吐量的效果。 从以上的描述中， 可以看出， 本发明实现了如下技术效果： 上述实施例提供的频 偏补偿方法及装置可以对处在高速运动场景的无线通信系统使用自适应频偏补偿对用 户信号进行频偏补偿处理， 从而可以在基带层面实时地检测出当前子帧频率偏移的相 关信息， 也能对频偏造成的基带信号相位偏移予以校正， 进而达到了提高基带的解调 性能、 系统吞吐量的效果。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布在多个计算装置所 组成的网络上， 可选地， 它们可以用计算装置可执行的程序代码来实现， 从而， 可以 将它们存储在存储装置中由计算装置来执行， 并且在某些情况下， 可以以不同于此处 的顺序执行所示出或描述的步骤， 或者将它们分别制作成各个集成电路模块， 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样， 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领域的技 术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内， 所作的 任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。 S814, performing interference cancellation by using a filter sliding method. The frequency offset compensation method provided by the above embodiment is used to perform frequency offset compensation processing on the user signal by using the adaptive frequency offset compensation for the wireless communication system in the high speed motion scene, and solves the problem that the related technology cannot detect the frequency variation range and the correction frequency in real time. The problem of phase shift of the baseband signal caused by the partiality, thereby achieving the effect of improving the demodulation performance and system throughput of the baseband. FIG. 9 is a structural block diagram of a frequency offset compensation apparatus according to an embodiment of the present invention, which is used to implement the frequency offset compensation method provided by the foregoing embodiment. As shown in FIG. 9, the device mainly includes: a first estimation module 10, a determination module 20, a first compensation module 30, and a second compensation module 40. The estimating module 10 is configured to: when the user equipment (UE) accesses the base station, perform a frequency offset value estimation on the input signal of the UE to obtain a Doppler frequency offset value; the determining module 20 is connected to the estimating module 10, and is set to Determining whether the Doppler frequency offset value exceeds a preset threshold; the first compensation module 30 is connected to the determining module 20, and is configured to perform frequency conversion on the input signal according to the adaptive frequency offset correction algorithm if the determination result is yes The second compensation module 40 is connected to the first compensation module 30, and is configured to perform frequency offset compensation on the input signal according to the uplink dual pilot frequency offset estimation algorithm if the determination result is negative. FIG. 10 is a structural block diagram of a frequency offset compensation apparatus according to a preferred embodiment of the present invention. As shown in FIG. 10, in the apparatus, the first compensation mode 30 block includes: a second estimation module 32 configured to frequency the input signal. The third compensation module 34 is coupled to the second estimation module 32 and configured to perform spectral compensation on the input signal subjected to the frequency offset estimation. In a preferred embodiment of the present invention, the second estimating module 32 includes: a capturing unit 322 configured to perform frequency offset range capturing on the input signal by using a single pilot signal; and a locking unit 324 connected to the capturing unit 322, configured In order to utilize the dual pilot signal, the frequency offset value is locked to the input signal captured by the frequency offset range. Preferably, the third compensation module 34 includes: a first compensation unit 342 configured to perform inter-symbol frequency offset compensation on the input signal obtained by the frequency offset value locking; a second compensation unit 344 connected to the first compensation unit 342, configured In order to perform intra-symbol frequency offset compensation on the input signal obtained by inter-symbol frequency offset compensation, a demodulated signal is obtained. The frequency offset compensation device provided by the above embodiment is used to perform frequency offset compensation processing on the user signal by using the adaptive frequency offset compensation for the wireless communication system in the high speed motion scene, and solves the problem that the related technology cannot detect the frequency variation range and the correction frequency in real time. The problem of phase shift of the baseband signal caused by the partiality, thereby achieving the effect of improving the demodulation performance and system throughput of the baseband. From the above description, it can be seen that the present invention achieves the following technical effects: The frequency offset compensation method and apparatus provided by the foregoing embodiments can perform adaptive frequency offset compensation on a user signal for a wireless communication system in a high speed motion scene. The frequency offset compensation processing can detect the current sub-frame frequency offset related information in real time at the baseband level, and can also correct the baseband signal phase offset caused by the frequency offset, thereby improving the baseband demodulation performance and system. The effect of throughput. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

权 利 要 求 书 Claim
1. 一种频偏补偿方法， 包括： 1. A frequency offset compensation method, comprising:
当用户设备 UE接入基站时， 对所述 UE的输入信号进行频偏值预估得到 多普勒频偏值；  When the user equipment UE accesses the base station, performing a frequency offset value estimation on the input signal of the UE to obtain a Doppler frequency offset value;
判断所述多普勒频偏值是否超过预先设定的阈值， 如果是， 根据自适应频 偏校正算法对所述输入信号进行频偏补偿， 否则， 根据上行双导频频偏估计算 法对所述输入信号进行频偏补偿。  Determining whether the Doppler frequency offset value exceeds a preset threshold, and if so, performing frequency offset compensation on the input signal according to an adaptive frequency offset correction algorithm, otherwise, according to an uplink dual pilot frequency offset estimation algorithm The input signal is used for frequency offset compensation.
2. 根据权利要求 1所述的方法， 其中， 根据自适应频偏校正算法对所述输入信号 进行频偏补偿， 包括： 2. The method according to claim 1, wherein the frequency offset compensation of the input signal according to an adaptive frequency offset correction algorithm comprises:
对所述输入信号进行频偏估计；  Performing frequency offset estimation on the input signal;
对经过所述频偏估计的输入信号进行所述频谱补偿。  The spectral compensation is performed on an input signal that is estimated by the frequency offset.
3. 根据权利要求 2所述的方法， 其中， 对所述输入信号进行频偏估计， 包括： 利用预设的单导频信号对所述输入信号进行频偏范围捕捉； 利用预设的双导频信号对经过频偏范围捕捉得到的输入信号进行频偏值锁 定。 3. The method according to claim 2, wherein performing frequency offset estimation on the input signal comprises: performing frequency offset range capture on the input signal by using a preset single pilot signal; using a preset dual guide The frequency signal locks the frequency offset value of the input signal captured by the frequency offset range.
4. 根据权利要求 3所述的方法， 其中， 对经过所述频偏估计的输入信号进行所述 频谱补偿， 包括： 4. The method according to claim 3, wherein performing the spectrum compensation on the input signal subjected to the frequency offset estimation comprises:
对经过频偏值锁定得到的输入信号进行符号间频偏补偿；  Inter-symbol frequency offset compensation is performed on the input signal obtained by the frequency offset value locking;
对经过符号间频偏补偿得到的输入信号进行符号内频偏补偿， 得到解调信 号。  The intra-symbol frequency offset compensation is performed on the input signal obtained by inter-symbol frequency offset compensation to obtain a demodulated signal.
5. 根据权利要求 1至 4中任一项所述的方法， 其中， 自适应频偏校正算法应用于 多普勒频偏值的范围为大于 1000HZ。 The method according to any one of claims 1 to 4, wherein the adaptive frequency offset correction algorithm is applied to the Doppler frequency offset value in a range of more than 1000 Hz.
6. 根据权利要求 5所述的方法， 其中， 上行双导频频偏估计算法应用于多普勒频 偏值的范围为大于等于 -1000HZ, 且小于等于 1000HZ。 The method according to claim 5, wherein the uplink dual pilot frequency offset estimation algorithm is applied to the Doppler frequency offset value in a range of -1000 Hz or more and 1000 Hz or less.
7. 一种频偏补偿装置， 包括： 第一估计模块， 设置为当用户设备 UE接入基站时， 对所述 UE的输入信 号进行频偏值预估得到多普勒频偏值； 7. A frequency offset compensation device comprising: a first estimation module, configured to: when the user equipment UE accesses the base station, perform a frequency offset value estimation on the input signal of the UE to obtain a Doppler frequency offset value;
判断模块， 设置为判断所述多普勒频偏值是否超过预先设定的阈值； 第一补偿模块， 设置为在判断结果为是的情况下， 根据自适应频偏校正算 法对所述输入信号进行频偏补偿；  a determining module, configured to determine whether the Doppler frequency offset value exceeds a preset threshold; the first compensation module is configured to, if the determination result is yes, the input signal according to the adaptive frequency offset correction algorithm Perform frequency offset compensation;
第二补偿模块， 设置为在判断结果为否的情况下， 根据上行双导频频偏估 计算法对所述输入信号进行频偏补偿。  The second compensation module is configured to perform frequency offset compensation on the input signal according to an uplink dual pilot frequency offset estimation method if the determination result is negative.
8. 根据权利要求 7所述的装置， 其中， 所述第一补偿模块包括： The device according to claim 7, wherein the first compensation module comprises:
第二估计模块， 设置为对所述输入信号进行频偏估计；  a second estimation module, configured to perform frequency offset estimation on the input signal;
第三补偿模块，设置为对经过所述频偏估计的输入信号进行所述频谱补偿。  The third compensation module is configured to perform the spectrum compensation on the input signal estimated by the frequency offset.
9. 根据权利要求 8所述的装置， 其中， 所述第二估计模块包括： The device according to claim 8, wherein the second estimating module comprises:
捕捉单元， 设置为利用单导频信号对所述输入信号进行频偏范围捕捉； 锁定单元， 设置为利用双导频信号对经过频偏范围捕捉得到的输入信号进 行频偏值锁定。  The capturing unit is configured to perform frequency offset range capturing on the input signal by using a single pilot signal; and the locking unit is configured to perform frequency offset locking on the input signal captured by the frequency offset range by using the dual pilot signal.
10. 根据权利要求 9所述的装置， 其中， 所述第三补偿模块包括： The device according to claim 9, wherein the third compensation module comprises:
第一补偿单元， 设置为对经过频偏值锁定得到的输入信号进行符号间频偏 补偿；  The first compensation unit is configured to perform inter-symbol frequency offset compensation on the input signal obtained by the frequency offset value locking;
第二补偿单元， 设置为对经过符号间频偏补偿得到的输入信号进行符号内 频偏补偿， 得到解调信号。  The second compensation unit is configured to perform intra-symbol frequency offset compensation on the input signal obtained by inter-symbol frequency offset compensation to obtain a demodulated signal.
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