CN102082744A - Method and device for estimating frequency deviation based on pilot frequency and data - Google Patents

Method and device for estimating frequency deviation based on pilot frequency and data Download PDF

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CN102082744A
CN102082744A CN200910224263XA CN200910224263A CN102082744A CN 102082744 A CN102082744 A CN 102082744A CN 200910224263X A CN200910224263X A CN 200910224263XA CN 200910224263 A CN200910224263 A CN 200910224263A CN 102082744 A CN102082744 A CN 102082744A
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pilot
frequency offset
data
phase
frequency
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CN102082744B (en
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李萍
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中兴通讯股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver
    • H04L27/2655Synchronisation arrangements
    • H04L27/2657Carrier synchronisation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver
    • H04L27/2655Synchronisation arrangements
    • H04L27/2668Details of algorithms
    • H04L27/2673Details of algorithms characterised by synchronisation parameters
    • H04L27/2675Pilot or known symbols
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver
    • H04L27/2655Synchronisation arrangements
    • H04L27/2668Details of algorithms
    • H04L27/2673Details of algorithms characterised by synchronisation parameters
    • H04L27/2676Blind, i.e. without using known symbols
    • H04L27/2679Decision-aided
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver
    • H04L27/2655Synchronisation arrangements
    • H04L27/2689Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/0014Carrier regulation
    • H04L2027/0044Control loops for carrier regulation
    • H04L2027/0063Elements of loops
    • H04L2027/0067Phase error detectors
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; Arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/022Channel estimation of frequency response

Abstract

The invention discloses a method for estimating frequency deviation based on pilot frequency and data. The method comprises: acquiring a frequency domain channel estimated value of a pilot frequency bit of an object user; calculating the phase of pilot frequency channel estimation; selecting a data symbol according to the phase of the pilot frequency channel estimation, and acquiring the phase information caused by frequency deviation according to the data symbol; acquiring a residual phase difference according to the phase information and the pilot frequency signal channel estimation; and acquiring a frequency deviation value according to the residual phase difference. The invention also discloses a frequency deviation estimation device based on pilot frequency and data. According to theinvention, the performance frequency deviation estimated capacity of a receiver can be improved, the relative frequency deviation between a base station and a terminal can be estimated effectively, the interference caused by sub carrier wave orthogonality damage of an OFDM (orthogonal frequency division multiplexing) system is reduced, the estimation and compensation range of the frequency deviation by the receiver is improved, especially when large frequency deviation exists in a high-speed moving environment link, the frequency deviation value exists in a system can be estimated more accurately, and a reliable guarantee is provided for the communication service quality.

Description

一种基于导频和数据的频偏估计方法和装置 Frequency Offset Estimation of and apparatus based on the pilot and data

技术领域 FIELD

[0001] 本发明涉及无线通信技术领域,特别是涉及一种基于导频和数据的频偏估计方法和装置。 [0001] The present invention relates to wireless communication technologies, and more particularly to a method and apparatus for frequency offset estimation based on the pilot and data.

背景技术 Background technique

[0002] LTE (Long Term Evolution,长期演进)项目是近两年来3GPP (ThirdGeneration Partnership Projects,第三代伙伴组织计划)启动的最大的新技术研发项目,它改进并增强了3G(Third Generation,第三代移动通信技术)的空中接入技术。 [0002] LTE (Long Term Evolution, Long Term Evolution) project is nearly two years 3GPP (ThirdGeneration Partnership Projects, Third Generation Partnership Program Organization) launched the largest new technology research and development projects, it improves and enhances 3G (Third Generation, the first generation mobile communication technology) air access technology. 与3G相比,LTE更具技术优势,体现在更高的用户数据速率、分组传送、降低系统延迟、系统容量和覆盖的改善以及运营成本的降低等方面。 Compared with 3G, LTE more technical advantages, reflected in higher user data rates, packet transmission, reduce system latency, and improved system capacity and coverage of the lower operating costs and so on.

[0003] LTE 下行链路采用OFDM (Orthogonal Furequency Division Multiplexity,正交频分复用)技术,OFDM具有频谱利用率高、抗多径干扰等特点,OFDM系统能够有效地抵抗无线信道带来的影响。 [0003] LTE downlink using OFDM (Orthogonal Furequency Division Multiplexity, orthogonal frequency-division multiplexing) technique, the OFDM has high spectrum efficiency, anti-multipath interference characteristics, the OFDM system can effectively resist the impact caused by the radio channel . LTE上行链路传输方案采用带循环前缀的SC-FDMA(Single Carrier Furequency Division Multiplexity,单载波频分复用),在上行采用带循环前缀的SC-FDMA传输方案中,使用DFT(DiscreteFourier Transformation,离散傅立叶变换) 获得频域信号,然后插入零符号进行频谱搬移,搬移后的信号再通过IFFTanverse Fast Fourier Transformation,逆快速傅立叶变换),可以降低发射终端的峰均功率比。 LTE uplink transmission scheme with cyclic prefix uses SC-FDMA (Single Carrier Furequency Division Multiplexity, single-carrier frequency division multiplexing) using the cyclic prefix in the uplink SC-FDMA transmission scheme, a DFT (DiscreteFourier Transformation, Discrete peak Fourier transform) to obtain a frequency domain signal, and then insert a zero symbol spectrum move, move through the signal IFFTanverse fast Fourier transformation, inverse fast Fourier transform), can reduce the average power ratio of the transmitting terminal.

[0004] 对于多载波系统来说,载波频率的偏移会导致子信道之间产生干扰。 [0004] For a multi-carrier system, the carrier frequency offset will cause interference between subchannels. OFDM系统内存在多个正交子载波,输出信号是多个子信道信号的叠加,由于子信道互相覆盖,这就对载波间的正交性有较高的要求。 OFDM system memory a plurality of orthogonal sub-carrier output signal is a superposition of a plurality of sub-channel signal, since each subchannel covering, which have high requirements for orthogonality between the carriers.

[0005] 由于终端的移动,会在基站和终端之间产生多普勒频移,在移动通信系统中,特别是高速场景下,这种频移尤其明显。 [0005] Since the mobile terminal, will produce a Doppler shift between a base station and a terminal in a mobile communication system, in particular high-speed scenario, this frequency shift is particularly evident. 多普勒频移将使接收机和发射机之间产生频率误差,导致接收信号在频域内发生偏移,引入载波间干扰,使得系统的误码率性能恶化。 Doppler shift will generate a frequency error between a transmitter and a receiver, the received signal occurs resulting in a shift in the frequency domain, the introduction of inter-carrier interference, such that the BER performance deterioration.

[0006] 多普勒频移的大小和相对运动速度大小有关,它们之间的关系是: [0006] The size and frequency shift of the Doppler velocity magnitude related to the relative movement, the relationship between them is:

[0007] [0007]

Figure CN102082744AD00051

[0008] 其中,θ为终端移动方向和信号传播方向之间的夹角;ν是终端运动速度;C为电磁波传播速度;fo为载波频率。 [0008] where, θ is the angle between the moving direction of the terminal and the signal propagation direction; v is the velocity of the terminal; electromagnetic wave propagation velocity C; carrier frequency FO.

[0009] LTE系统对于移动终端,保证15km/h及以下速率的移动用户系统特性最优,而对15〜120km/h的移动用户可提供高性能服务,保持120〜350km/h移动用户的服务,高于350km/h移动用户不掉网。 [0009] LTE system for the mobile terminal to ensure 15km / h or less and the rate of mobile user optimum system characteristics, and the mobile user 15~120km / h high-performance service can be provided, holding 120~350km / h mobile subscriber services , higher than 350km / h mobile network users can not afford. 在此速度范围内,多普勒频移超过400Hz,基站和终端必须支持足够的频偏补偿技术才能满足业务质量要求。 Within this velocity range than 400Hz Doppler shift, the base station and the terminal must support sufficient to meet the frequency offset compensation technique quality of service requirements.

[0010] 对于接收机来说,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。 [0010] for the receiver, and estimates a frequency error between the transmitter and to complete the frequency error correction function of the receiver is to be completed. 终端接收到fd的频移,终端锁定下行信号频率后发送上行信号,上行接收将会有2*fd的频移。 The terminal receives the frequency shift fd, the downlink signal frequency to lock the terminal transmits an uplink signal, the uplink receiver will be 2 * fd of the frequency shift.

[0011] 现有的一种终端移动过程中的频偏示意图如图1所示,终端和基站的相对运动 [0011] A conventional terminal during movement schematic offset relative movement of the base station and the terminal 1 shown in FIG.

5方向不同,会产生正负不同的频偏,设fo是基站的发射频率,当终端向远离基站的方向运动时,会产生负频偏_fd,终端接收到的频率是fcrfd,基站接收的频率是fcr2*fd ;当终端向靠近基站的方向运动时,会产生正频偏fd,终端接收到的频率是&+4,基站接收的频率是f0+2*fdo当终端在两个基站之间运动,从一个基站驶向另一个基站的时候,终端会出现频率跳变,从频率fcrfd调到频率&+4,终端将会有2*fd的频率跳变。 5 in different directions will produce different positive and negative frequency offset, fo is the transmit frequency is provided a base station, when the terminal movement in a direction away from the base station, generates a negative offset _fd, the frequency is received by the terminal fcrfd, received by base station frequency fcr2 * fd; when the terminal approaches the base station direction, produces a positive frequency offset fd, the frequency is received by the terminal & + 4, the base station receiving frequency is f0 + 2 * fdo two base stations when the terminal movement between the sail from one base station to another base station when the terminal displays the frequency hopping, transferred from the frequency fcrfd & + 4, the terminal will be 2 * fd of frequency hopping. 2*fd无论对于基站接收机,还是终端接收机都将是一个不小的挑战,过大的频率偏移量会造成通信质量下降,严重的时候会导致服务中断,尤其是在高速移动环境下。 2 * fd both for the base station receiver, or a receiver terminal will be a big challenge, too large frequency offset will cause degradation of communication quality, severe cases can cause service disruptions, especially in high-speed mobile environment .

[0012] 如果不能正确估计频偏并进行补偿,那么系统性能将大大降低,尤其是当频偏较大时(对应终端运动速度较高时),现有技术中使用导频做频偏估计,可以估计的频偏范围小,复杂度高,当系统存在大频偏时,抗噪能力有所下降。 [0012] If the frequency offset estimation and compensation is not properly, the system performance will be greatly reduced, especially when a large frequency offset (corresponding to the terminal movement speed is high), the prior art do offset estimation using a pilot, small can be estimated frequency offset range, high complexity, when there is a large deviation systems, noise immunity declined.

发明内容 SUMMARY

[0013] 本发明要解决的问题是提供一种基于导频和数据的频偏估计方法和装置,以克服现有技术中使用导频做频偏估计,估计的频偏范围小,复杂度高的缺陷。 [0013] The problem to be solved of the present invention is to provide a method and apparatus for frequency offset estimation based on the pilot and data, to overcome the small prior art frequency offset estimation using a pilot doing, the estimated frequency offset range, high complexity Defects.

[0014] 为达到上述目的,本发明的技术方案提供一种基于导频和数据的频偏估计方法, 所述方法包括以下步骤:获取目标用户的导频位频域信道估计值;计算导频信道估计的相位;根据所述导频信道估计的相位选择数据符号,并根据所述数据符号获取频偏引起的相位信息;根据所述相位信息和导频信道估计的相位获取残余相位差;根据所述残余相位差获取频偏值。 [0014] To achieve the above object, the technical solution of the present invention to provide a frequency offset estimation method of pilot and data, based on the method comprises the steps of: acquiring the target user pilot bit frequency domain channel estimation values; calculating a pilot channel estimated phase; according to the pilot selection channel estimated phase data symbols and the data symbols according to the phase information due to frequency offset acquisition; acquiring residual phase difference according to the phase of said pilot channel estimate and pilot phase information; the the residual frequency offset value acquisition phase.

[0015] 进一步,在所述获取目标用户的导频位频域信道估计值的步骤中,具体包括:根据公式 [0015] Further, the user obtains the target pilot bit frequency domain channel estimation value step letter, comprises: according to the formula

Figure CN102082744AD00061

with

Figure CN102082744AD00062

获取目标用户的导频位频 Acquiring a target user's pilot bit frequency

域信道估计值,其中树…⑷为导频1的信道估计值,树―⑷为导频2的信道估计值, 为导频1的频域接收序列,珍〉⑷为导频2的频域接收序列,X(m) (k)为本地频域导频码,长度均为M,m为用户。 Domain channel estimation value, wherein the tree ... ⑷ a pilot channel estimation value 1, the tree -⑷ a pilot channel estimation value 2, a pilot in the frequency domain a received sequence, Jane> ⑷ the pilot frequency domain 2 receiving the sequence, X (m) (k) for the local frequency domain pilot symbol, the length of both m, m for the user.

[0016] 进一步,在所述计算导频信道估计的相位的步骤中,具体包括:根据公式 [0016] Further, in the step of calculating a phase estimation of the pilot channel, the specifically includes: according to formula

[0017] [0017]

Figure CN102082744AD00063

[0018] 计算导频信道估计的相位为求复数的辐角主值运算 [0018] The pilot channel is calculated estimated phase for the sake of argument of a complex number value calculation main

Figure CN102082744AD00064

为导频位频域信道估计值,h_slot」=1 or 2,η e整数,使得'e ,f)。 Frequency domain channel estimation value of a pilot bit, h_slot "= 1 or 2, η e integer, such that 'e, f).

[0019] 进一步,所述根据导频信道估计的相位选择数据符号具体为:当所述导频信道估计的相位大于0时,选择所述导频位左边的数据符号;当所述导频信道估计的相位小于或等于0时,选择所述导频位右边的数据符号。 [0019] Further, according to the phase of the selection data symbol for pilot channel estimation is specifically: when the pilot channel estimated phase is greater than 0, selecting the pilot symbols in the frequency data bits left; when the pilot channel estimated phase is less than or equal to zero, selecting the pilot symbol data bits to the right frequency.

[0020] 进一步,当所述导频信道估计的相位大于0时,选择所述导频位左边相邻的数据符号;当所述导频信道估计的相位小于或等于0时,选择所述导频位右边相邻的数据符号。 [0020] Further, when the derivative of the phase of the pilot channel estimation is greater than 0, selecting the pilot bit left adjacent pilot symbol data; if the pilot channel estimated phase is less than or equal to 0, the selected guide the right frequency adjacent data bit symbols.

[0021] 进一步,所述获取频偏引起的相位信息具体为:将所述选择的数据符号对应到调制符号的域,解调制,并硬判数据,将硬判后的数据再调制为符号;用未判决的符号乘以判决后的符号的共轭得到一复数值,并对所述复数值求相位,得到数据符号的残余相位。 [0021] Further, due to the frequency offset acquiring phase information is specifically: the symbol corresponding to the selected data field to the modulation symbols, demodulate, and hard decision data, the data is remodulated symbol hard decision; No symbol decisions multiplied decision symbols to obtain a conjugate complex value, the complex values ​​and calculating the phase, the phase of the data symbols to give a residue. 6[0022] 进一步,在所述获取残余相位差的步骤中,具体包括:根据公式 6 [0022] Further, in the step of acquiring the residual phase differences comprises: according to the formula

Figure CN102082744AD00071

(选择导频位左边的数据符号时) ,、 (When the data symbols of the pilot bits left) ,,

八产)=<)⑷H翻导難右边隱■号时)计算获取残余馳差Δ Φ,其 Yield eight) = <) is difficult to guide the right turn ⑷H hidden number ■) calculating and obtaining the residual override difference Δ Φ, which

中Hi-,为导频信道估计的相位,<)(々)为数据符号的残余相位,i为数据符号序号,m为用户。 Hi-in, the phase of a pilot channel estimation, <) (々) the residual phase data symbols, i is the data symbol number, m is a user.

[0023] 进一步,所述根据相位差获取频偏值的步骤具体包括:根据公式 [0023] Further, according to the frequency offset value of the phase difference acquisition step comprises: according to the formula

Figure CN102082744AD00072

计算频偏值f,其中△ Φω为残余相位差,χ为导频和所选择的数据 Calculated frequency offset value f, where the residual phase difference △ Φω, χ is the pilot data and the selected

符号之间间隔的数据符号个数。 The number of symbols between the data symbol interval.

[0024] 进一步,在所述根据相位差获取频偏值的步骤之后,还包括:根据所述频偏值判断选择分支,并获取与所述分支对应的频偏初值;根据所述分支对应的频偏初值结合导频进行频偏估计。 [0024] Further, in accordance with the frequency offset value after the step of obtaining a phase difference, further comprising: selecting a branch based on the determined frequency offset value, and acquires the initial value of the frequency offset corresponding to the branch; according to correspond to the branch Initial binding of the frequency offset frequency offset estimation pilots.

[0025] 进一步,在所述根据分支对应的频偏初值结合导频进行频偏估计的步骤中,具体包括:将用户m的导频位频域信道估计值/Z1wR)、//产(幻分为Q段,在每段内进行频域平滑,并对连续的Ns_thing = M/Q个子载波上的导频位频域信道估计值进行求平均,获取平均值互丨:^和云Ϊ ;根据公式 [0025] Further, according to the initial value of the frequency offset corresponding to the branch pilots binding step in the frequency offset estimation comprises: pilot bits user m frequency domain channel estimation value / Z1wR), // yield ( magic is divided into Q sections, smooth frequency domain within each segment, and a continuous pilot bits on Ns_thing = M / Q sub-carrier channel estimation values ​​in the frequency domain are averaged, the average value of mutual acquisition Shu: ^ Ϊ cloud and ; according to the formula

[0026] [0026]

Figure CN102082744AD00073

[0027] 获取频偏估计Afka,其中Z为求复数的辐角主值运算,t为两个计算相位差的子载波之间间隔的个数,Afci为与分支对应的频偏初值,1为使Δ Afsjka e (-1000,1000)的整数,s为组的序号,Δ Δ Afka*中间频偏值。 [0027] The estimated frequency offset acquisition Afka, wherein Z is a radiation angle of the primary requirements of a plurality of value calculation, t is the number of sub-carrier spacing between the two calculated phase differences, AFCI is a frequency offset corresponding to the initial value of the branch, 1 For Δ Afsjka e (-1000,1000) is an integer, s is the group number, Δ Δ Afka * intermediate frequency offset value.

[0028] 进一步,在所述获取平均值云口和云=的步骤中,具体包括:根据公式 [0028] Further, in the obtaining step and the average value Yunkou = the cloud, specifically includes: according to formula

[0029] [0029]

Figure CN102082744AD00074

with

Figure CN102082744AD00075

获取平均值 Obtaining an average value

云,^和云S ,其中S为组的序号,j为每组中元素的序号。 Cloud, cloud ^ and S, where S is the group number, j is the number of elements in each group.

[0030] 本发明的技术方案还提供一种基于导频和数据的频偏估计装置,所述装置包括: 导频位频域信道估计值获取单元,用于获取目标用户的导频位频域信道估计值;导频信道估计的相位获取单元,用于计算导频信道估计的相位;相位信息获取单元,用于根据所述导频信道估计的相位选择数据符号,并根据所述数据符号获取频偏引起的相位信息;残余相位差获取单元,用于根据所述相位信息和导频信道估计的相位,获取残余相位差;频偏值获取单元,用于根据所述残余相位差获取频偏值。 [0030] further aspect of the present invention to provide a frequency offset estimation based on pilot and data, said apparatus comprising: a pilot bit frequency domain channel estimation value acquisition unit for acquiring a target user pilot bit frequency domain channel estimation value; pilot channel estimated phase acquisition unit for calculating a pilot channel estimation phase; phase information acquiring means for, and obtained according to the data symbols according to the pilot channel estimation phase selection data symbols phase information caused by the frequency offset; residual phase difference acquisition means for phase estimation based on the pilot channel and the pilot channel phase information, obtaining the residual retardation; frequency offset value acquisition unit configured to acquire residual frequency offset according to the phase difference value. [0031] 进一步,所述装置还包括:频偏初值获取单元,用于根据所述频偏值获取单元获取的频偏值判断选择分支,并获取与所述分支对应的频偏初值;频偏估计单元,用于根据所述分支对应的频偏初值结合导频进行频偏估计。 [0031] Further, the apparatus further comprising: initial value of a frequency offset acquisition unit configured to determine whether to select the branch offset value acquisition unit acquires a frequency offset value according to the frequency offset and acquire the initial value corresponding to the branch; frequency offset estimation unit for estimating the pilot frequency offset frequency offset corresponding to branch according to the initial value binding.

[0032] 与现有技术相比,本发明有益效果如下: [0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] 本发明根据导频和数据OFDM符号之间的相位差来估计频偏初值范围,再用估计出的频偏初值范围结合导频估计频偏值,从而提高接收机性能频偏估计能力,可以有效地估计基站和终端之间的相对频偏,降低OFDM系统由于对子载波正交性破坏所带来的干扰, 提高接收机对频偏的估计和补偿范围,尤其是高速移动环境链路中存在大频偏时,能较准确的估计系统中存在的频偏值,为通信服务质量提供了可靠的保障。 [0033] The present invention combines the pilot frequency offset value estimated from the pilot data and the phase difference between the OFDM symbols estimated frequency offset range of the initial value, then the initial value of the estimated frequency offset range, thereby improving the performance of the receiver frequency offset estimation capability can be effectively estimate the relative frequency offset between the base station and the terminal, since the system to reduce interference OFDM subcarriers caused by the destruction of orthogonality, and to improve the estimation of the frequency offset compensation range of the receiver, especially in high-speed mobile when there is a large frequency offset environment links, frequency offset value can be more accurately estimated present in the system, to provide a reliable guarantee for the quality of communication service.

附图说明 BRIEF DESCRIPTION

Figure CN102082744AD00081

[0034] 图1是现有技术的一种终端移动过程中的频偏示意图; [0034] FIG. 1 is a schematic diagram of a frequency offset terminal during movement of the prior art;

[0035] 图2是本发明实施例一的一种基于导频和数据的频偏估计方法的流程图; [0035] FIG 2 is a flowchart illustrating a frequency offset estimation method based on the pilot and data embodiment of the present invention;

[0036] 图3是本发明实施例二的一种基于导频和数据的频偏估计方法的流程图; [0036] FIG. 3 is a flowchart according to the second frequency offset estimation method based on the pilot and data embodiment of the present invention;

[0037] 图4是本发明实施例的一种频偏分支示意图; [0037] FIG. 4 is a schematic embodiment of a branch offset embodiment of the present invention;

[0038] 图5是本发明实施例三的一种基于导频和数据的频偏估计装置的结构示意图。 [0038] FIG. 5 is a third embodiment of the present invention is a schematic structural diagram of the apparatus based on the frequency offset estimate and the pilot data. 具体实施方式 Detailed ways

[0039] 下面结合附图和实施例,对本发明的具体实施方式作进一步详细描述。 [0039] The following embodiments and the accompanying drawings, specific embodiments of the present invention will be further described in detail. 以下实施例用于说明本发明,但不用来限制本发明的范围。 The following examples serve to illustrate the present invention but are not intended to limit the scope of the present invention.

[0040] 本发明提供一种基于导频和数据的频偏估计方法,所述方法包括以下步骤:获取目标用户的导频位频域信道估计值;计算导频信道估计的相位;根据所述导频信道估计的相位选择数据符号,并根据所述数据符号获取频偏引起的相位信息;根据所述相位信息和导频信道估计的相位获取残余相位差;根据所述残余相位差获取频偏值。 [0040] The present invention provides a frequency offset estimated pilot and data, the method comprising the steps of based on: obtaining a target user pilot bit frequency domain channel estimation values; calculating a pilot phase channel estimate; according to the pilot channel selection data symbol phase estimate, and acquires the phase information due to frequency offset based on the data symbols; residue acquisition phase according to the phase of the pilot channel estimate and said pilot phase information; acquiring residual frequency offset according to the phase difference value.

[0041] 在所述获取目标用户的导频位频域信道估计值的步骤中,具体包括:根据公式 [0041] In obtaining the target user pilot bit frequency domain channel estimation step value, comprises: according to the formula

Figure CN102082744AD00082

获取目标用户的导频位频域 Get target user pilot bit frequency domain

信道估计值,其中//”⑦)为导频1的信道估计值,//丨⑷⑷为导频2的信道估计值,浐〗⑷为 Channel estimation value, wherein the // "⑦) of a pilot channel estimation value 1, // Shu ⑷⑷ a pilot channel estimation value of 2, to Chan〗 ⑷

导频1的频域接收序列,If 为导频2的频域接收序列,X(m) (k)为本地频域导频码,长度均为M,m为用户。 A frequency domain pilot sequence is received, If the received frequency domain pilot sequence 2, X (m) (k) for the local frequency domain pilot symbol, the length of both M, m for the user.

[0042] 在所述计算导频信道估计的相位的步骤中,具体包括:根据公式 [0042] In the step of calculating a phase estimation of the pilot channel, the specifically includes: according to formula

Figure CN102082744AD00083

[0044] 计算导频信道估计的相位为求复数的辐角主值运算,//=,^.(^)为导频位频域信道估计值,h_slot」=1 or 2,ne整数,使得Ε(_ϋ)。 [0044] Calculation pilot channel estimated phase is the argument of the main value calculation seeking complex, // =, ^ (^) is a pilot-bit channel estimation values ​​in the frequency domain, h_slot "= 1 or 2, ne integer, such that Ε (_ϋ).

[0045] 所述根据导频信道估计的相位选择数据符号具体为:当所述导频信道估计的相位大于0时,选择所述导频位左边的数据符号;当所述导频信道估计的相位小于或等于0时, 选择所述导频位右边的数据符号。 [0045] The pilot channel according to the estimated phase selection data symbols specifically: When the derivative of the phase of the pilot channel estimation is greater than 0, selecting the pilot symbol data bits on the left; when the perch channel estimation phase is less than or equal to zero, selecting the pilot symbol data bits to the right frequency. 优选的,当所述导频信道估计的相位大于0时,选择所述导频位左边相邻的数据符号;当所述导频信道估计的相位小于或等于0时,选择所述导频位右边相邻的数据符号。 Preferably, when the pilot channel estimated phase is greater than 0, selecting the pilot bit left adjacent pilot symbol data; if the pilot channel estimated phase less than or equal to 0, selecting the pilot bit the right adjacent data symbols.

[0046] 所述获取频偏引起的相位信息具体为:将所述选择的数据符号对应到调制符号的域,解调制,并硬判数据,将硬判后的数据再调制为符号;用未判决的符号乘以判决后的符号的共轭得到一复数值,并对所述复数值求相位,得到数据符号的残余相位。 [0046] The phase information acquiring frequency offset caused specifically: the domain corresponding to selected data symbols to modulation symbols, demodulate, and hard decision data, the data is remodulated symbol hard decision; Not used conjugated symbol decisions multiplied decision symbols obtained after a complex value, the complex values ​​and calculating the phase, the phase of the data symbols to give a residue.

[0047] 在所述获取残余相位差的步骤中,具体包括:根据公式 [0047] In the step of acquiring the residual phase comprises: according to the formula

Figure CN102082744AD00091

计算获取残余相位差△Φ(m)其中Φ(m)h-slot-i为导频信道估计的相位, Φ(m)di(k)为数据符号的残余相位,i为数据符号序号,m为用户。 Calculating and acquiring residual phase difference △ Φ (m) where Φ (m) h-slot-i for the pilot channel estimation phase, Φ (m) di (k) is the residual phase data symbols, i is the data symbol number, m for the user.

[0048] 所述根据相位差获取频偏值的步骤具体包括:根据公式 [0048] The frequency offset values ​​according to the phase difference acquisition step comprises: according to the formula

Figure CN102082744AD00092

算频偏值f,其中△ Φ(m)为残余相位差,X为导频和所选择的数据符号之间间隔的数据符号个数。 Calculated frequency offset value f, where △ Φ (m) as a residual phase difference, X is the number of data symbol intervals between the selected pilot and data symbols.

[0049] 在所述根据相位差获取频偏值的步骤之后,还包括:根据所述频偏值判断选择分支,并获取与所述分支对应的频偏初值;根据所述分支对应的频偏初值结合导频进行频偏估计。 [0049] The frequency offset value after the step of obtaining the phase difference, further comprising the: selecting the frequency offset value is determined based on the branch, the branch and acquires a frequency offset corresponding to the initial value; according to the frequency corresponding to the branch Initial binding partial frequency offset estimation pilots.

[0050] 在所述根据分支对应的频偏初值结合导频进行频偏估计的步骤中,具体包括:将用户m的导频位频域信道估计值代H(m)1(k)、H2(m)(k)分为Q段,在每段内进行频域平滑,并对连续的Ns_thing = M/Q个子载波上的导频位频域信道估计值进行求平均,获取平均值H-(m)1,s和H2(m)2,s;根据公式 [0050] In accordance with the initial value of the branch corresponding to a frequency offset in conjunction with the step of pilots in the frequency offset estimation comprises: m pilot users frequency-domain channel estimation value generation of H (m) 1 (k), H2 (m) (k) is divided into Q sections, smooth frequency domain within each segment, and a continuous pilot bits on Ns_thing = m / Q sub-carrier channel estimation values ​​in the frequency domain averaging, the average acquisition H - (m) 1, s and H2 (m) 2, s; according to the formula

[0051] [0051]

Figure CN102082744AD00093

[0052] 获取频偏估计△fka,其中ζ为求复数的辐角主值运算,t为两个计算相位差的子载波之间间隔的个数,△f0为与分支对应的频偏初值,1为使Δ △fs,ka ∈ (-1000,1000)的整数,s为组的序号,Δ Δ fs,ka和△△fka为中间频偏值。 [0052] The estimated frequency offset acquisition △ fka, wherein a plurality of ζ for the sake of argument main value calculation, t is the number of sub-carrier spacing between the two calculated phase difference, △ f0 is the frequency offset corresponding to the initial value of the branch 1 is that the Δ △ fs, integer ka ∈ (-1000,1000) is, s is the group number, Δ Δ fs, ka and △△ fka intermediate frequency offset value.

[0053] 在所述获取平均值H-(m)1,s和H-(m)2,s的步骤中,具体包括:根据公式 [0053] In the step of obtaining an average value H- (m) 1, s and H- (m) 2, s, a comprises: according to the formula

[0054] [0054]

Figure CN102082744AD00094

with

Figure CN102082744AD00095

获取平均值H-(m)1,s Obtaining an average value H- (m) 1, s

和H-(m)2,s,其中s为组的序号,j为每组中元素的序号。 And H- (m) 2, s, where s is the group number, j is the number of elements in each group.

[0055] 实施例-[0056] 本发明实施例的一种基于导频和数据的频偏估计方法如图2所示,包括以下步骤: One kind of embodiment [0056] of the present invention in FIG. 2 frequency offset estimation based on the pilot and data, comprises the steps of - [0055] Example:

[0057] 步骤S201,获取目标用户的导频位频域信道估计值。 [0057] step S201, the acquired channel estimation value of the target user pilot bit frequency domain. 本实施例中,根据如下公式 In this embodiment, according to the formula

[0058] [0058]

Figure CN102082744AD00101

[0059] [0059]

[0060] 获取用户m的导频位频域信道估计值,其中//丨―(幻为导频1的信道估计值, 琍〜⑷为导频2的信道估计值,if〗⑷为导频1的频域接收序列,卞>⑷为导频2的频域接收序列,Xw (k)为本地频域导频码,长度均为Μ,Φ,Π Φ2分别包含导频1对应的、和导频2对应的t2时刻的信道相位特性与频偏相位信息。 [0060] Gets the user m pilot bit frequency domain channel estimation value, wherein // Shu - (Magic a pilot channel estimation value 1, li ~⑷ channel estimation values ​​of pilot 2, IF〗 ⑷ the pilot receiving the frequency-domain sequence, Bian> ⑷ to frequency-domain received pilot sequence 2, Xw (k) in the frequency domain for the local pilot code length are Μ, Φ, Π Φ2 respectively comprise a corresponding pilot, and phase characteristic of the pilot channel 2 at time t2 corresponding to the frequency offset phase information.

[0061] 步骤s202,计算导频信道估计的相位。 [0061] Step s202, the pilot channel is calculated derivative of the phase estimation. 本实施例中,根据公式 Embodiment, the present embodiment according to the formula

[0062] [0062]

Figure CN102082744AD00102

[0063] 计算导频信道估计的相位(/^…'其中,Z为求复数的辐角主值运算,H{^slot^(k)为导频位频域信道估计值,h_slot_i = 1 or 2,η e整数,使得 [0063] Calculation of the pilot phase of the channel estimate (/ ^ ... 'wherein, Z for the sake of a plurality of radiation angle of the primary value calculation, H (k) is a pilot-bit channel estimation value {^ slot ^ frequency domain, h_slot_i = 1 or 2, η e integer, such that

Figure CN102082744AD00103

[0064] 步骤s203,根据所述导频信道估计的相位选择数据符号,并根据所述数据符号获取频偏引起的相位信息。 [0064] Step S203, according to the pilot selection channel estimated phase data symbols and the data symbols according to the phase information due to frequency offset acquisition. 本实施例中,当所述导频信道估计的相位大于0时,选择所述导频位左边的数据符号进行频偏估计,优选的用左边相邻的数据计算频偏;当所述导频信道估计的相位小于0时,选择所述导频位右边的数据符号进行频偏估计,优选的用右边相邻的数据计算频偏。 In this embodiment, when the pilot channel estimated phase is greater than 0, selecting the pilot symbols in the frequency data bits left of the frequency offset estimate, preferably using the adjacent data is calculated offset left; when the pilot channel estimated phase is less than 0, selecting the pilot symbol data bits to the right of the frequency offset estimate, preferably using the frequency offset to the right of the adjacent data is calculated.

[0065] 如果导频位信道估计结果的相位; > 0 ,那么将左边数据位,优选左边相邻数据位,对应到调制为符号的域,例如PUSCH(Physical Uplink SiaredChannel,上行链路共享物理信道),则需将解调数据做反傅里叶变换,并硬判,获取相位差。 [0065] If pilot bits for channel estimation phase results;> 0, then the left of the data bits, preferably left adjacent data bits, corresponding to the modulated symbol fields, e.g. PUSCH (Physical Uplink SiaredChannel, uplink shared physical channel ), you need to do the inverse Fourier transform of demodulated data, and hard decision, acquired phase difference.

[0066] 如果QPSK符号是时域信号,则= IfftCsT );如果QPSK符号是频域信号,则 [0066] If the symbol is a QPSK time domain signal, = IfftCsT); if QPSK symbol domain signal is a frequency, then

"(m). "(M).

di = S1 , di = S1,

[0067] 解调制数据,并进行硬判决,= hardidT') ,"hard"表示硬判决函数;将硬判后的数据^;:^再调制为符号i-Ot),调制星座图和解调制的星座图相同。 [0067] The demodulated data, and making a hard decision, = hardidT '), "hard" represents a hard decision function; data after hard decision ^;: ^ remodulated symbol i-Ot), modulation constellation and demodulation the same constellation.

[0068] 用未判决的符号乘以判决后的符号的共轭,对得到的复数值求相位,,得到数据符 [0068] No symbol decisions multiplied decision symbols conjugate complex values ​​obtained for calculating the phase to obtain data symbols,,

M M M M

号的残余相位,劣的(幻=/_{d\m\k). d\fad* (k)) ;γ - K ^ γ + Z , L是可以调整的参数。 Residual phase number, inferior (phantom = / _ {d \ m \ k) d \ fad * (k));. Γ - K ^ γ + Z, L can be adjusted parameters.

[0069] 步骤s204,根据所述相位信息和导频信道估计的相位,获取残余相位差。 [0069] Step S204, based on the phase information and the pilot phase channel estimation, acquisition residual retardation.

ι、Μ ,山+η#/、」Δ产L^mr⑷(选择导频位左边的数据符号时) ι, Μ, mountain + η # /, (selecting data symbol for pilot bits left) "Δ producing L ^ mr⑷

[0070] 本实施例中,根据公式彳,、 μ [0070] In this embodiment, according to the formula left foot ,, μ

>产,(选择导频位右边的数据符号时) > Production, (select the data symbols to the right of the guide pilot bits)

计算获取残余相位差Δ φ w,其中为导频信道估计的相位乂;0⑷为数据符号的残余相位,i为数据符号序号。 The residue calculating and acquiring the phase difference Δ φ w, wherein the pilot channel is estimated phase qe; 0⑷ the residual phase data symbol, i is symbol number data.

[0071] 步骤S205,根据所述残余相位差获取频偏值。 [0071] Step S205, the acquired residual frequency offset value according to the phase difference. 本实施例中,根据公式 Embodiment, the present embodiment according to the formula

Figure CN102082744AD00111

残*才目位n,x为导频禾π所ϋί華白勺数据χ 0.5x10 /7 χ χ * Mesh residue was bits n, x is the pilot data Wo π Wobbe spoon χ 0.5x10 / 7 χ χ is ϋί

符号之间间隔的数据符号个数。 The number of symbols between the data symbol interval.

[0072] 在步骤s203中,如果导频位信道估计结果的相位我:! [0072] In step s203, if the pilot bits for channel estimation results of phase I:! ,」< 0,那么解调右边数据 , "<0, then the right side of the demodulated data

位,优选右边相邻数据位,其余过程相同。 Position, preferably the right adjacent data bits, the same as the rest of the process.

[0073] 实施例二 [0073] Second Embodiment

[0074] 本发明实施例的一种基于导频和数据的频偏估计方法如图3所示,其中步骤s301〜s305与实施例一中的步骤s201〜s205相同。 [0074] An embodiment of the present invention, FIG. 3 embodiment frequency offset estimation based on the pilot and data, in which the same procedure of Example s301~s305 step of a s201~s205. 参照图3,本实施例在步骤s305之后,还包括以下步骤: Referring to Figure 3, in this embodiment, after the step S305, further comprising the step of:

[0075] 步骤s306,根据所述频偏值判断选择分支,并获取与所述分支对应的频偏初值。 [0075] Step S306, select the branch judgment based on the frequency offset value, and acquires the initial value of the frequency offset corresponding to the branch. 本实施例中,根据估计出的f对频偏进行分支选择,本实施例的一种频偏分支示意图如图4所示,fth、"fth是分支分界点,f\、f2、f3是分支对应的频偏初值,fth、_fth,fi> f2、f3以及分支个数都是参数,通过仿真或者外场实际环境获得。 f the present embodiment, based on the estimated frequency offset of the selected branch, a branch Frequency Offset As shown in Figure embodiments, fth, "fth branch demarcation point, f \, f2, f3 embodiment branch 4 frequency offset corresponding to the initial value, fth, _fth, fi> f2, f3 parameters and the number of branches is obtained by simulation or actual field environment.

[0076]当-fth 彡f 彡fth 时, [0076] When f -fth San San fth,

[0077]选择分支 2,Af。 [0077] The selection branch 2, Af. = f2 ; = F2;

[0078] if>fth 时, When [0078] if> fth,

[0079]选择分支 3,Af。 [0079] the selection branch 3, Af. = f3 ; = F3;

[0080]当 f<_fth 时, [0080] When f <while _fth,

[0081]选择分支 1,Aftl = f\。 [0081] The selection branches 1, Aftl = f \.

[0082] 步骤S307,根据所述分支对应的频偏初值结合导频进行频偏估计。 [0082] step S307, based on the initial value of the branch corresponding to the frequency offset frequency offset estimation pilots binding. 本实施例中,首先,对用户m的信道估计值/^m)(幻、H广乂/b)分为Q段,在每段内进行频域平滑。 In this embodiment, first, the channel estimation value of the user m / ^ m) (Magic, H wide qe / b) is divided into Q sections, smooth frequency domain within each segment. 将连续的Nsmoothing = M/Q个子载波上的信道估计值进行求平均,即根据公式 The channel estimation value on the continuous Nsmoothing = M / Q subcarriers for averaging, i.e. according to the formula

Figure CN102082744AD00112

和万Ϊ ,其中S为组的序号,j为每组中元素的序号。 And Wan Ϊ, where S is the group number, j is the number of elements in each group.

[0084] 然后,将Afci与导频位的信道估计值i/广乂幻、//〗m)(A:)相结合进行频偏估计。 [0084] Then, the pilot bit Afci channel estimation value i / qe wide phantom, //〗 m) (A :) combined frequency offset estimation. 用分支选择对应的初始频偏参与当前残余频偏计算,可以是各个接收天线分别获取,即得到Δ ^ka,也可以是分别获取再求均值,g卩Afci: Branch selection using initial frequency offset corresponding residual frequency offset calculation is currently involved in, the respective receiving antennas may be acquired, to obtain Δ ^ ka, respectively, may be acquired and then averaging, g Jie Afci:

[0085] 本实施例根据公式[0086] [0085] The present embodiment according to the formula [0086]

Figure CN102082744AD00121

[0087] 获取频偏估计Afka,其中Z为求复数的辐角主值运算(即求相位),t为两个计算相位差的子载波之间间隔的个数,Afci为与分支对应的频偏初值,1为使Δ Afs, kae (-1000,1000)的整数,s为组的序号,Δ Afka*中间频偏值。 [0087] The estimated frequency offset acquisition Afka, wherein Z is a radiation angle of the primary requirements of a complex value operation (i.e., calculating the phase), t is the number of sub-carrier spacing between the two calculated phase differences, Afci frequency corresponding to the branch partial initial value, to make a Δ Afs, integer kae (-1000,1000) is, s is the group number, Δ Afka * intermediate frequency offset value.

[0088] 实施例三 [0088] Example three

[0089] 本发明实施例的一种基于导频和数据的频偏估计装置的结构如图5所示,包括导频位频域信道估计值获取单元、导频信道估计的相位获取单元、相位信息获取单元、残余相位差获取单元、频偏值获取单元、频偏初值获取单元和频偏估计单元。 [0089] An embodiment of the present invention, the frequency offset estimation means based on the acquisition pilot and the data 5 includes a pilot bit frequency domain channel estimation value means a pilot channel estimated phase acquisition unit, a phase information acquisition unit, the residual phase difference acquisition unit, the frequency offset value acquisition unit, the initial value of the frequency offset acquisition unit and the frequency offset estimation unit. 其中导频信道估计的相位获取单元分别与导频位频域信道估计值获取单元、相位信息获取单元和残余相位差获取单元连接,残余相位差获取单元分别与相位信息获取单元和频偏值获取单元连接,频偏初值获取单元分别与频偏值获取单元和频偏估计单元连接。 Wherein the pilot channel estimated phase acquisition unit respectively pilot bit frequency domain channel estimation value acquisition unit, the phase information acquiring unit and the residual phase difference acquisition unit is connected, the residual phase difference acquisition unit acquiring unit, respectively, and the phase information acquisition frequency offset value means connected, respectively, the frequency offset acquisition unit acquires the initial value of the frequency offset value and a frequency offset estimation unit cells connected.

[0090] 导频位频域信道估计值获取单元用于获取目标用户的导频位频域信道估计值;导频信道估计的相位获取单元用于计算导频信道估计的相位;相位信息获取单元用于根据所述导频信道估计的相位选择数据符号,并根据所述数据符号获取频偏引起的相位信息;残余相位差获取单元用于根据所述相位信息和导频信道估计的相位,获取残余相位差;频偏值获取单元,用于根据所述残余相位差获取频偏值;频偏初值获取单元用于根据所述频偏值获取单元获取的频偏值判断选择分支,并获取与所述分支对应的频偏初值;频偏估计单元用于根据所述分支对应的频偏初值结合导频进行频偏估计。 [0090] pilot bit frequency domain channel estimation value acquisition unit for channel estimation value acquisition target user pilot bit frequency domain; pilot channel estimated phase acquisition unit for calculating a pilot phase channel estimate; phase information acquiring unit according to the pilot for channel estimation of the phase selection data symbols and the data symbols according to the phase information due to frequency offset acquisition; residual phase difference acquisition means according to the phase information of the pilot channel and the pilot channel phase estimation, acquisition the residue retardation; frequency offset value acquisition unit configured to acquire residual frequency offset value based on the phase difference; Initial frequency offset acquisition unit for acquiring frequency offset value determining unit acquires the selected frequency offset value according to the branch, and acquires Initial frequency offset corresponding to the branch; initial value of the frequency offset estimating means for estimating frequency offset in conjunction with a pilot based on the corresponding branch offset.

[0091] 本发明根据导频和数据OFDM符号之间的相位差来估计频偏初值范围,再用估计出的频偏初值范围结合导频估计频偏值,从而提高接收机性能频偏估计能力,可以有效地估计基站和终端之间的相对频偏,降低OFDM系统由于对子载波正交性破坏所带来的干扰, 提高接收机对频偏的估计和补偿范围,由于使用了分支选择方法,因此大大的增加基站和终端进行频偏估计的能力范围,本发明使接收机能准确的、稳定的进行频偏校正。 [0091] The present invention combines the pilot frequency offset value estimated from the pilot data and the phase difference between the OFDM symbols estimated frequency offset range of the initial value, then the initial value of the estimated frequency offset range, thereby improving the performance of the receiver frequency offset estimation capability can be effectively estimate the relative frequency offset between the base station and the terminal, since the system to reduce interference OFDM subcarriers caused by the destruction of orthogonality, and to improve the estimation of the frequency offset compensation range of the receiver, since the branch the method of selection, the base station and thus greatly increase the frequency offset estimate the terminal capabilities, the present invention enables the receiver to correct and stable offset correction is performed. 尤其是高速移动环境链路中存在大频偏时,能较准确的估计系统中存在的频偏值,为通信服务质量提供了可靠的保障。 Especially when there is a large frequency offset high-speed mobile environment links, frequency offset value can be more accurately estimated present in the system, to provide a reliable guarantee for the quality of communication service.

[0092] 以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明技术原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。 [0092] The above are only preferred embodiments of the present invention, it should be noted that those of ordinary skill in the art, in the art without departing from the principles of the present invention is provided, further improvements and modifications may be made to these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (13)

1. 一种基于导频和数据的频偏估计方法,其特征在于,所述方法包括以下步骤: 获取目标用户的导频位频域信道估计值;计算导频信道估计的相位;根据所述导频信道估计的相位选择数据符号,并根据所述数据符号获取频偏引起的相位信息;根据所述相位信息和导频信道估计的相位获取残余相位差; 根据所述残余相位差获取频偏值。 A frequency offset estimation method based on the pilot and data, wherein said method comprises the steps of: acquiring the target user pilot bit frequency domain channel estimation values; a phase calculation of the pilot channel estimation guide; according to the pilot channel selection data symbol phase estimate, and acquires the phase information due to frequency offset based on the data symbols; residue acquisition phase according to the phase of the pilot channel estimate and said pilot phase information; acquiring residual frequency offset according to the phase difference value.
2.如权利要求1所述的基于导频和数据的频偏估计方法,其特征在于,在所述获取目标用户的导频位频域信道估计值的步骤中,具体包括:根据公式试( 2. The method of estimating a frequency offset based on the pilot and data according to claim 1, wherein, in the obtaining a channel estimation value of the target user pilot bit frequency domain comprises: sample according to the formula (
Figure CN102082744AC00021
获取目标用户的导频位频域信道估计值,其中树―⑷为导频1的信道估计值,琍m)⑷为导频2的信道估计值,片“0⑷为导频1的频域接收序列,F2(m)⑷为导频2的频域接收序列,X(m) (k)为本地频域导频码,长度均为M,m为用户。 Get target user pilot bit frequency domain channel estimation value, wherein the tree -⑷ a pilot channel estimation value 1, li m) ⑷ the pilot channel estimation value 2, the sheet "0⑷ a pilot domain 1 receives pilot sequence, F2 (m) ⑷ 2 is a frequency domain pilot sequence is received, X (m) (k) for the local frequency domain pilot symbol, the length of both m, m for the user.
3.如权利要求2所述的基于导频和数据的频偏估计方法,其特征在于,在所述计算导频信道估计的相位的步骤中,具体包括:根据公式 As claimed in claim 2, the frequency offset estimation based on the pilot and data, wherein, in said step of calculating a phase estimation of the pilot channel, the specifically includes: according to formula
Figure CN102082744AC00022
计算导频信道估计的相位i^rih/z为求复数的辐角主值运算,//ί^Μ^ο为导频位频域信道估计值,h_slot_i = 1 or 2, η e整数,使得么^ ,f)。 Calculating pilot channel estimated phase i ^ rih / z for the sake of a plurality of radiation angle of the primary value calculation, // channel estimation value ο is the pilot bit frequency domain ί ^ Μ ^, h_slot_i = 1 or 2, η e integer, such that What ^, f).
4.如权利要求3所述的基于导频和数据的频偏估计方法,其特征在于,所述根据导频信道估计的相位选择数据符号具体为:当所述导频信道估计的相位大于O时,选择所述导频位左边的数据符号; 当所述导频信道估计的相位小于或等于O时,选择所述导频位右边的数据符号。 4. The method of frequency offset estimation based on the pilot and data according to claim 3, wherein the pilot channel according to the estimated phase data symbol selection specifically is: when the phase of the pilot channel estimation is greater than O when selecting the pilot symbols in the frequency of data bits on the left; when the pilot channel is less than or equal to the estimated phase O, selecting the pilot symbol data bits to the right frequency.
5.如权利要求4所述的基于导频和数据的频偏估计方法,其特征在于,当所述导频信道估计的相位大于O时,选择所述导频位左边相邻的数据符号; 当所述导频信道估计的相位小于或等于O时,选择所述导频位右边相邻的数据符号。 5. The frequency offset estimation method based on the pilot and data, wherein said 4, when the derivative of the phase of the pilot channel estimation is greater than O, selecting the pilot bit left adjacent pilot symbol data as claimed in claim; when the pilot channel estimation is equal to or less than the phase O, selecting the pilot bit to the right of the guide adjacent data symbols.
6.如权利要求4所述的基于导频和数据的频偏估计方法,其特征在于,所述根据所述数据符号获取频偏引起的相位信息具体为:将所述选择的数据符号对应到调制符号的域,解调制,并硬判数据,将硬判后的数据再调制为符号;用未判决的符号乘以判决后的符号的共轭得到一复数值,并对所述复数值求相位,得到数据符号的残余相位。 6. The frequency offset estimation method based on the pilot and data according to claim 4, wherein the acquiring the data symbols according to the phase information due to frequency offset is specifically: the symbol corresponds to the selected data domain, demodulated modulation symbols, and the hard decision data, the data is remodulated symbol hard decision; non-decision symbol is multiplied decision symbols to obtain a conjugate complex value, the complex values ​​and seek phase, to give a residual phase data symbols.
7.如权利要求6所述的基于导频和数据的频偏估计方法,其特征在于,在所述获取残余相位差的步骤中,具体包括:根据公式 According to the formula: 7. The frequency offset estimation method based on the pilot and data, wherein said 6, in the step of acquiring the residual phase difference, specifically including the claims
Figure CN102082744AC00031
计算获取残余相位差Δ φ (m),其中为导频信道估计的相位,必:0⑷为数据符号的残余相位,i为数据符号序号,m为用户。 The residue calculating and acquiring the phase difference Δ φ (m), wherein the pilot channel estimation phase shall: 0⑷ the residual phase data symbols, i is the data symbol number, m is a user.
8.如权利要求7所述的基于导频和数据的频偏估计方法,其特征在于,所述根据相位差获取频偏值的步骤具体包括:根据公式 As claimed in claim 7, said frequency offset estimation based on the pilot and data, wherein said frequency offset values ​​according to the phase difference acquisition step comprises: according to the formula
Figure CN102082744AC00032
计算频偏值f,其中Δ φω为残余相位差,χ为导频和所选择的数据符号之间间隔的数据符号个数。 Calculated frequency offset value f, where Δ φω is the residual phase, χ is the number of intervals between the data symbols and the pilot symbols of the selected data.
9.如权利要求1至8任一项所述的基于导频和数据的频偏估计方法,其特征在于,在所述根据相位差获取频偏值的步骤之后,还包括:根据所述频偏值判断选择分支,并获取与所述分支对应的频偏初值; 根据所述分支对应的频偏初值结合导频进行频偏估计。 According to the frequency: 1 to 8 according to any one of the frequency offset estimation based on the pilot and data, wherein the step of obtaining the phase difference according to the following frequency offset value, comprising the further according to claim determining the bias value selection branches, and acquires the initial value of the frequency offset corresponding to the branch; branch according to the initial value corresponding to the frequency offset frequency offset estimation pilots binding.
10.如权利要求9所述的基于导频和数据的频偏估计方法,其特征在于,在所述根据分支对应的频偏初值结合导频进行频偏估计的步骤中,具体包括:将用户m的导频位频域信道估计值ZZ1wR)、丑广乂幻分为Q段,在每段内进行频域平滑,并对连续的Ns_thing = M/Q个子载波上的导频位频域信道估计值进行求平均,获取平均 10. The method as claimed in claim frequency offset estimation based on the pilot and data, wherein the 9, in the bonding step the initial value for the pilot frequency estimation of a frequency offset in accordance with the corresponding branch, specifically comprising: m pilot users frequency-domain channel estimation value ZZ1wR), ugly phantom wide qe into Q sections, smooth frequency domain within each segment, and a continuous pilot bits on Ns_thing = m / Q subcarriers in the frequency domain channel estimation value averaging, obtains an average
Figure CN102082744AC00033
根据公式获取频偏估计Afka,其中Z为求复数的辐角主值运算,t为两个计算相位差的子载波之间间隔的个数,Afci为与分支对应的频偏初值,1为使Δ Afsjka e (-1000,1000)的整数, s为组的序号,Δ Δ Afka*中间频偏值。 Obtaining offset estimation according to the formula Afka, wherein Z is a radiation angle of the primary requirements of a plurality of value calculation, t is the number of sub-carrier spacing between the two calculated phase differences, AFCI is the initial value of the branch corresponding to the frequency offset, 1 so that integer Δ Afsjka e (-1000,1000) is, s is the group number, Δ Δ Afka * intermediate frequency offset value.
11.如权利要求10所述的基于导频和数据的频偏估计方法,其特征在于,在所述获取平均值万丨!:〉和云Ϊ的步骤中,具体包括:根据公式 As claimed in claim 10, frequency offset estimation based on the pilot and data, wherein, in the obtaining average Wan Shu:!> And cloud Ϊ step comprises: according to the formula
Figure CN102082744AC00034
with
Figure CN102082744AC00035
获取平均值云Ϊ和云Ϊ ,其中S为组的序号,j为每组中元素的序号。 Obtaining an average value and cloud cloud Ϊ Ϊ, where S is the group number, j is the number of elements in each group.
12. 一种基于导频和数据的频偏估计装置,其特征在于,所述装置包括:导频位频域信道估计值获取单元,用于获取目标用户的导频位频域信道估计值; 导频信道估计的相位获取单元,用于计算导频信道估计的相位; 相位信息获取单元,用于根据所述导频信道估计的相位选择数据符号,并根据所述数据符号获取频偏引起的相位信息;残余相位差获取单元,用于根据所述相位信息和导频信道估计的相位获取残余相位差;频偏值获取单元,用于根据所述残余相位差获取频偏值。 12. A frequency offset estimation based on the pilot and data, wherein the apparatus comprising: pilot bit frequency domain channel estimation value acquisition unit for acquiring a target user pilot bit frequency domain channel estimation values; pilot channel estimated phase acquisition unit that calculates a derivative of the phase of the pilot channel estimation; phase information acquiring means for selecting the data according to the symbols in the frequency derivative of the phase of channel estimation, and frequency offset according to the data acquired due to symbol phase information; residual phase difference acquisition unit, a phase according to the phase information of the pilot channel estimation and acquiring residual retardation; frequency offset value acquisition unit configured to acquire residual frequency offset value according to the phase difference.
13.如权利要求12所述的基于导频和数据的频偏估计装置,其特征在于,所述装置还包括:频偏初值获取单元,用于根据所述频偏值获取单元获取的频偏值判断选择分支,并获取与所述分支对应的频偏初值;频偏估计单元,用于根据所述分支对应的频偏初值结合导频进行频偏估计。 As claimed in claim 12, wherein the frequency offset estimation means based on the pilot and data, wherein said apparatus further comprises: initial value of frequency offset acquisition unit for acquiring frequency offset acquisition unit according to the value determining the bias value selection branches, and acquires the initial value of the frequency offset corresponding to the branch; frequency offset estimation unit for estimating the pilot frequency offset frequency offset corresponding to branch according to the initial value binding.
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