CN1921463B - Communication channel estimation method and realizing device for crossing frequency division multiplexing mobile communication system - Google Patents

Communication channel estimation method and realizing device for crossing frequency division multiplexing mobile communication system Download PDF

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CN1921463B
CN1921463B CN 200510093257 CN200510093257A CN1921463B CN 1921463 B CN1921463 B CN 1921463B CN 200510093257 CN200510093257 CN 200510093257 CN 200510093257 A CN200510093257 A CN 200510093257A CN 1921463 B CN1921463 B CN 1921463B
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夏树强
林佳仕
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中兴通讯股份有限公司
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Abstract

The invention relates to a signal channel estimate method of orthogonal frequency division multiplexing mobile communication system and relative device. Wherein, it comprises: based on prefix or judgment feedback information, or the impact response message of last OFDM mark to obtain the impact response rough estimation of relative mark signal channel; generating structural matrix; based on localreference signal and received pilot signal, calculating correlative vector; using recurrence formula to obtain the fine estimation result of signal channel impact response; judging if said fine estimation result is constricted; obtaining the signal channel estimation results of all carrier waves; selecting available data carrier wave signal channel to output. The invention can be used in quick decrease and slow decrease signal channels, with less calculation and small memory space demand, without threshold value selection.

Description

正交频分复用移动通信系统的信道估计方法和实现装置 Orthogonal frequency division multiplexing channel estimation method for a mobile communication system and apparatus for implementing

技术领域 FIELD

[0001] 本发明涉及无线移动通信系统中的信道估计方法,具体涉及正交频分复用移动通 [0001] The present invention relates to a channel estimation method in a wireless mobile communication system, and particularly relates to an orthogonal frequency division multiplexing mobile communication

信系统的信道估计方法和实现装置,特别涉及结合前缀和导频进行的信道估计方法和实现装置。 Channel estimation method and apparatus for implementing communication systems, and particularly relates to a combined prefix and a channel estimation method and implementation pilots apparatus.

背景技术 Background technique

[0002] 作为一种多载波传输模式,正交频分复用(OFDM)通过将一高速传输的数据流转换为一组低速并行传输的数据流,使系统对多径衰落信道频率选择性的敏感度大大降低, 而循环前缀的引入,又进一步增强了系统抗符号间干扰(ISI)的能力。 [0002] As a multi-carrier transmission mode orthogonal frequency division multiplexing (OFDM), by converting the data stream is a high-speed transmission speed parallel transmission of a set of data streams, the system of the multipath fading channel frequency selectivity sensitivity greatly reduced, while introducing a cyclic prefix, further enhances the ability of interference (ISI) between symbols anti system. 除此之外的带宽利 In addition to the bandwidth utilization

用率高、实现简单等特点使0Fmi在无线通信领域的应用越来越广,而信道估计作为0Fmi系 With high, easy realization that the application in the field of wireless communications 0Fmi more widely, as the channel estimation based 0Fmi

统的关键技术也成为通信领域研究的热点,受到越来越多的关注。 The key technology system has become a hot research field of communication, more and more attention.

[0003] OFDM系统的训练序列插入形式有两种,块状导频和梳状导频。 [0003] The training sequence is inserted in the form of two OFDM system, pilot and massive pilot comb. 现有的信道估计方 Estimating the existing channel

法大都是基于其中某一种导频排列方式(块状导频或梳状导频)进行的。 Large wherein a certain kind of process is based on the pilot arrangement (block pilot or pilot comb) performed.

[0004] 这两种类型的信道估计方法各有特点:基于块状导频的信道估计方法对信道的频 [0004] The channel estimation method different characteristics of these two types: a channel estimation method based on a frequency block of a pilot channel

率选择性不是很敏感,但是只适用于衰落比较缓慢的无线信道中;对于基于梳状导频的信 Selectivity is not very sensitive, but applies only to relatively slow fading wireless channel; comb-based channel for the pilot

道估计方法,可以适用于衰落比较快的无线信道,但是对信道的频率选择性却比较敏感。 Channel estimation method can be applied to radio channel fading faster, but more sensitive to the frequency selectivity of the channel. and

结合这两种信道估计的优点,对信道进行估计的方法尚不多见。 It combines the advantages of both channel estimation, channel estimation method is still rare.

[0005] 对于基于0FDMA标准的802. 16系统来说,它既有块状导频(下面称为前缀),也有梳状导频(下面直接称为导频)。 [0005] For 0FDMA 802.16 standards-based systems, it has both a pilot block (hereinafter referred to as prefix), there are pilot comb (hereinafter referred to as pilot directly). 如果只利用前缀进行信道估计,由于前缀符号一帧只发送一次,当信道为快衰落信道时,只利用前缀无法准确跟踪信道的变化,从而影响系统的解调性能。 If only performs channel estimation using a prefix, a prefix notation since only sent once, when the channel is a fast fading channel, not only by the prefix accurately track changes in the channel, so that demodulation performance of the system. 如果只利用导频进行信道估计,当信道的频率选择性比较显著时,基于导频的信道估计方法的准确度也会随之下降,甚至产生"地板效应",即系统的误比特率不随着信噪比的提高而提高。 If using only the pilot channel estimation, when the frequency selective channel is more significant, the accuracy of channel estimation method pilot will fall, and even "floor effect", i.e. the bit error rate of the system is not as improve the signal to noise ratio is improved.

[0006] 以基于0FDMA标准的802. 16系统为例,在FUSC模式下,导频载波间隔为66kHz., 而对于信道模型为SUI-5(修正的斯坦福大学临时信道模型-5)的信道,信道的相干带宽为70kHz ;对于信道模型为SUI-6(修正的斯坦福大学临时信道模型-6)的信道,信道的相干带宽为38kHz。 [0006] In 802.16 systems based 0FDMA standards, for example, in FUSC mode, the pilot subcarrier spacing of 66kHz., Whereas for the channel model SUI-5 (amended provisional channel Stanford model -5) channel, coherence bandwidth of the channel is 70kHz; channel model for SUI-6 (amended provisional channel model Stanford -6) channel, a channel coherence bandwidth of 38kHz. 导频载波间隔和SUI-5信道的相干带宽接近,大于SUI-6信道的相干带宽,此时,就非常容易发生地板效应。 Pilot carrier interval and SUI-5 channel coherence bandwidth close to SUI-6 is greater than the coherence bandwidth of the channel, at this time, it is very likely to occur floor effect. 因此,结合前缀和导频信号,来对无线信道进行估计是非常必要的。 Thus, the combined prefix and a pilot signal to estimate the radio channel is necessary.

[0007] 公开号为CN1505293A,公开日期为2004年6月16目的"正交频分复用系统中的信道估计方法和估计器",提出一种综合利用前缀和导频进行信道估计的方法,这个方法即可以应用于快衰落信道,也可以应用于信道频率选择性比较显著的信道,包括导频载波间隔小于相关带宽的情况。 [0007] Publication No. CN1505293A, publication date June 16, 2004 Objective "orthogonal frequency-division multiplexing and channel estimation method in the estimator system", proposes a method for utilization prefix and the pilot for channel estimation, i.e., this method may be applied to fast fading channels, the channel may be applied to relatively significant frequency selective channel, including the case of pilot carriers correlation bandwidth is less than the spacing.

[0008] 但是,为了实施该方法,该方法要求信道类型的判断和主要路径的选择。 [0008] However, in order to implement the method, this method requires channel selection and determination of the main path of the channel type. 如果信道类型选择方法不当,不能准确判断出信道的类型,该方法的性能会急剧恶化,并且该专利也没有给出信道类型的判断方法;对于主要传播路径选择,该专利利用前缀脉冲响应来选择主要路径,其中涉及到门限的选择,信道估计性能对这个门限的选择也很敏感,仿真表明, 如果这个门限选择不当,信道估计性能会急剧下降。 Improper channel type selection method can not accurately determine the type of channel, the method performance drastically deteriorated, and the patent does not channel type determination method is given; to the main propagation path selection in this patent using the prefix of the impulse response is selected the main path, which involves the threshold selection, channel estimation performance is also very sensitive to the choice of this threshold, the simulation shows that if the inappropriate choice of this threshold, the channel estimation performance would drop dramatically.

发明内容 SUMMARY

[0009] 本发明的目的之一是提供一个结合前缀和导频对正交频分复用移动通信系统进行的信道估计方法,本发明所述方法性能优良,实现简单,并且能够适应各种信道类型,如频率选择性信道,快衰落信道等。 [0009] One object of the present invention is to provide a combined prefix and pilot orthogonal frequency division multiplexing channel estimation method using the mobile communication system, the excellent performance of the method according to the present invention, simple, and can accommodate various channel type, such as frequency selective channel, the channel fast fading and the like. [0010] 本发明还提供实现上述方法的装置。 [0010] The present invention further provides apparatus for implementing the method.

[0011] 为实现发明目的,本发明提出一种结合前缀和导频进行信道估计方法和装置。 [0011] For the purpose of the invention, the present invention provides a combined prefix and the pilot channel estimation method and apparatus. 由系统发射机产生信道估计所用的导频信号,包括导频插入方式以及导频值选取两部分内容;产生的导频信号经过逆傅立叶变换变成时域导频信号;在无线多径衰落信道上发射该时域导频信号;由系统接收机对时域导频信号经过傅立叶变换得到频域导频信号。 Generating a pilot signal for channel estimation used, including pilot insertion scheme and pilot values ​​to select two parts by the system transmitter; generating a pilot signal to inverse Fourier transformation into time domain pilot signal; multipath fading channel in a wireless transmitting the pilot signal of the time domain; on time domain pilot signal from the system receiver through a Fourier transform frequency domain pilot signal. [0012] 本发明是这样具体实现的: [0012] The present invention is embodied in:

[0013] —种正交频分复用移动通信系统的信道估计方法,包括以下处理: [0013] - Channel estimation method of a mobile communication system multiplex types orthogonal frequency division, comprising the following process:

[0014] 第一步骤,根据前缀、或者判决反馈信息、或上一个正交频分复用符号的冲激响应 [0014] In a first step, feedback information from a prefix, or judgment, or an orthogonal frequency-division multiplexing symbol impulse response

信息获得相应符号信道的冲激响应粗估计; Obtaining respective information symbol channel impulse response estimate crude;

[0015: [0015:

其维数为所述信道冲激响应粗估计的长度,所述构造矩阵的元素t(p)按(1)式计算; f (p)=-"21" 尸=o, i,…,£—i (i) Which is the dimension of the coarse estimate of the channel impulse response length, the configuration of elements of the matrix t (p) according to equation (1) is calculated; f (p) = - "21" dead = o, i, ..., £ -i (i)

[0019: [0019:

[0020: [0020:

[0021: [0021:

结果, result,

[0022: [0022:

细估, Fine assessment,

[0023: [0023:

[0024: [0024:

[0025: [0025:

第二步骤,根据本地参考导频信号产生构造矩阵,所述构造矩阵为共轭转置方阵, A second step of generating a matrix configuration according to the local reference pilot signal, the matrix is ​​configured conjugate transpose matrix,

[0016: [0017: [0016: [0017:

< 1 ; <1;

[0018: [0018:

相关矢量的长度等于所述构造矩阵的维数,所述互相关矢量的元素r(p)按(2)式计算; Correlation vector length is equal to the dimension of the matrix is ​​configured, the elements of the cross correlation vector r (p) by (2) is calculated;

式中,k表示载波的偏置;P表示导频载波偏置的集合;a是收敛因子,满足0 < a X(k)表示本地的参考导频信号;『/P-expC/,),是逆傅里叶变换因子; Wherein, k represents a carrier offset; P represents a set of pilot carrier offset; a is convergence factor, satisfying 0 <a X (k) represents the local reference pilot signal; "/ P-expC /,), factor is the inverse Fourier transform;

第三步骤,根据本地参考导频信号和接收到的导频信号计算互相关矢量,所述互 A third step, according to the local reference pilot signal and the pilot received pilot signal to calculate the cross-correlation vector, the cross

KP)-"2]哗K'(炎)『w"",…,丄-1 (2) KP) - "2] Wow K '(inflammation)" w "", ..., Shang-1 (2)

式中,Y(k)表示接收到的导频信号;a是收敛因子,满足0 <a< 1 ; 第四步骤,根据构造矩阵、互相关矢量,通过递归等式获得信道冲激响应的细估计 In the formula, Y (k) represents the received pilot signal; a is convergence factor, satisfying 0 <a <1; the fourth step, the configuration of the matrix, cross-correlation vector, to obtain a fine channel impulse response by a recursive equation estimate

所述递归等式为:^,n+1 = Hm,n+R-THm,n,式中,Hm, n表示某一帧中的第HI个正交频分复 The recursive equation is: ^, n + 1 = Hm, n + R-THm, n, in the formula, Hm, n represents a frame HI orthogonal frequency division multiplexing

用符号第n次信道冲激响应的细估计结果,n = 0, 1, 2, Fine impulse response estimation result indicated by a symbol n-th channel, n = 0, 1, 2,

第五步骤,判定根据递归等式获得的细估计结果是否收敛,是,输出该冲激响应的十结果,否,继续进行递归等式的计算; A fifth step of the determination result has converged in accordance with the recursive estimation equation obtained fine, that the output of the impulse response of ten results, whether to continue the calculation of the recursive equation;

第六步骤,对输出冲激响应的细估计结果进行系统所有载波数目的快速傅里叶变 A sixth step of the fine impulse response estimation result output will be the number of all the carriers becomes fast Fourier system

换,获得所有载波数目的信道估计结果; In other words, the number of carriers to obtain all channel estimation result;

第七步骤,从系统所有载波数目的信道估计结果中选择有用的数据载波信道估计 A seventh step, the result selecting useful data carrier channel estimation from all the number of carrier channel estimation system

结果并输出。 The results and output.

所述第五步骤通过判定连续两次递归运算的结果的均方差是否小于一固定常数, The fifth step is performed by determining whether the results of the recursive computation is twice less than a fixed constant mean squared error,

若是,输出冲激响应细估计结果,否则,将此次递归计算的结果作为下一次递归计算的输 If so, fine impulse response estimation result output, otherwise, the results of the recursive computation as the next input of the recursive computation

5入,继续递归计算。 5 into, continue recursive computation.

[0026] 所述第五步骤固定递归次数,进行相应次数的递归计算后,输出冲激响应的细估 After [0026] the fifth step of fixing the number of recursions, the corresponding number of times the recursive computation, the output of the fine estimated impulse response

计结果,并作为下一个正交频分复用符号的冲激响应信息。 Count result, and the information of the next impulse response multiplexing symbol as orthogonal frequency division.

[0027] 所述信道冲激响应的细估计结果的长度等于所述构造矩阵的维数。 The [0027] Fine channel estimation result of the impulse response of a length equal to the dimension of the matrix structure.

[0028] —种实现正交频分复用移动通信系统的信道估计方法的装置,其特征在于包括: [0028] - means for estimating seed achieve orthogonality of the channel multiplexing method of a mobile communication system, a frequency division, characterized by comprising:

[0029] 信道冲激响应粗估计器,根据前缀、判决反馈或上一个正交频分复用符号的冲激 [0029] The crude channel impulse response estimator, the feedback prefix, judgment or a pulsed orthogonal frequency division multiplexing symbol

响应信息获得信道的冲激响应粗估计; Channel impulse response information obtained crude response estimate;

[0030] 构造矩阵产生器,根据本地参考导频信号产生构造矩阵,所述构造矩阵为共轭转置方阵,其维数为所述信道冲激响应粗估计的长度,所述构造矩阵的元素t(p)按(1)式计算; [0030] The matrix generator configured to generate reference pilot signals according to a local configuration matrix, the matrix is ​​configured conjugate transpose matrix, whose dimension in response to the estimated length of the thick channel impulse, the configuration matrix element t (p) according to equation (1) is calculated;

[0031] ,(P) = —"!]|义("|2『,,户=0,1,-..,丄-1 (1) [0032] 式中,k表示载波的偏置;P表示导频载波偏置的集合;a是收敛因子,满足0 < a < 1 ;X(k)表示本地的参考导频信号;『J^-exp(7,),是逆傅里叶变换因子; [0031], (P) = - "!] | Yi (" | 2 ",, p = 0,1, - .., Shang -1 (1) [0032] wherein, k represents the carrier offset; It represents a set of P pilot carrier offset; a is convergence factor, satisfying 0 <a <1; X (k) represents the local reference pilot signal; "J ^ -exp (7,), the inverse Fourier transform factor;

[0033] 互相关矢量产生器,根据本地参考导频信号和接收到的导频信号计算产生互相关矢量,所述互相关矢量的长度等于所述构造矩阵的维数,所述互相关矢量的元素r(p)按(2)式计算; [0033] The cross correlation vector generator, calculated to produce the crosscorrelation vector according to the local reference pilot signal and the received pilot signals, the cross correlation vector is equal to the length dimension of the matrix structure of the cross correlation vector element r (p) by (2) is calculated;

[0034] "/7)-flJ]y("jr P-0,…,丄-l (2) [0034] "/ 7) -flJ] y (" jr P-0, ..., Shang -l (2)

[0035] 式中,Y(k)表示接收到的导频信号;a是收敛因子,满足O <a< 1 ; [0035] In the formula, Y (k) represents the received pilot signal; a is the convergence factor, satisfying O <a <1;

[0036] 数据选择器,选择信道冲激响应的粗估计或者递归等式的结果作为乘法器的一个 Results [0036] The data selector selects a channel impulse response or recursive coarse estimation equation as a multiplier

输入,所述递归等式为:Hm,n+1 = Hm,n+R-THm,n,式中,Hm, n表示某一帧中的第HI个正交频分复 Input, the recursive equation is: Hm, n + 1 = Hm, n + R-THm, n, in the formula, Hm, n represents a frame HI orthogonal frequency division multiplexing

用符号第n次信道冲激响应的细估计结果,n = 0, 1, 2,…; Fine impulse response estimation result indicated by a symbol n-th channel, n = 0, 1, 2, ...;

[0037] 乘法器,计算构造矩阵和数据选择器输出的乘积并输出; [0037] The product of the multiplier, and the matrix calculation configuration data and outputs the selected output;

[0038] 加法器,计算互相关矢量产生器、乘法器和数据选择器的输出的和,并输出; [0038] The adder calculates a cross-correlation vector generator, and the output from the multiplier and the data selector, and outputs;

[0039] 终止条件判定器,判断递归等式是否收敛,如果已经收敛,终止递归等式计算,输 [0039] The termination condition determiner determines recursive equation converges, if has converged, to terminate the recursive equation that the output

出信道冲激响应,否则继续进行递归等式计算; The channel impulse response, or continue recursively calculated from the equation;

[0040] 快速傅里叶变换器,对终止条件判定器的输出进行系统载波数目的快速傅里叶变换; [0040] The fast Fourier transformer, the output termination condition determiner performs a number of system carrier fast Fourier transform;

[0041] 信道估计结果选择器,从所有载波数目的信道估计结果中选择有用的数据载波信道估计并输出。 [0041] The channel estimation result of the selector, the result selecting useful data carrier channel estimates and outputs the estimated number of carriers from all channels.

[0042] 所述终止条件判定器,判定连续两次递归运算的结果的均方差是否小于一固定常数,若是,输出冲激响应细估计结果,否则,将此次递归计算的结果作为下一次递归计算的输入,继续递归计算。 [0042] The termination condition determiner determines that the result of two successive recursive computation mean square deviation is less than a fixed constant, if the output of the fine impulse response estimation result, otherwise, the results of the recursive computation as the next recursion calculation of input, continue recursive computation.

[0043] 所述终止条件判定器固定递归次数,进行相应次数的递归计算后,输出冲激响应的细估计结果,并作为下一个正交频分复用符号的冲激响应信息。 [0043] fixed number of times the recursive termination condition is determined, a finely estimation result corresponding number of recursive calculation, the output of the impulse response, and as the next orthogonal frequency division multiplexing symbol impulse response information.

[0044] 与现有信道估计方法相比,该方法适应快衰落信道和慢衰落信道,包括导频的密度小于相关带宽的情况,不需要判断信道的类型以及信道的主要传输路径选择,具有计算量小,要求存储空间小,不用进行门限选择,实现容易等特点。 [0044] Compared with the conventional channel estimation method, the method is suitable for fast fading channel and a slow fading channel, including the case of pilot density is less than the correlation bandwidth, the main transmission path to select the type required to judge the channel and the channel, a computing a small amount of space required to store small, without performing threshold selection, easy to implement and so on. 附图说明 BRIEF DESCRIPTION

[0045] 图1是包含本发明的接收机结构示意图; [0046] 图2是本发明提出的信道估计器内部实现示意图; [0047] 图3是本发明提出的信道估计器内部实现示意图对应的流程图。 [0045] FIG. 1 is a schematic diagram of a receiver structure according to the present invention comprises; [0046] FIG. 2 is implemented internally by the present invention a channel estimator schematic; [0047] FIG. 3 is an internal achieved by the present invention a channel estimator schematic view corresponding to flow chart.

具体实施方式 detailed description

[0048] 以下结合附图对本发明作详细说明: [0048] conjunction with the drawings of the present invention will be described in detail:

[0049] 为实现第一个发明目的,本发明提出的方法主要包括以下步骤: [0050] 1、根据前缀或者判决反馈信息或上一个0F匿符号的冲激响应信息获得第m 号的信道的冲激响应粗估计Hm,。 [0049] To achieve the first object of the invention, the method proposed by the present invention includes the following steps: [0050] 1, in accordance with decision feedback prefix or impulse, or information on a symbol 0F anonymous response information obtained m-th channel rough estimate impulse response Hm ,. .

[0051] 2、根据式子(1)产生构造矩阵T,T的维数等于冲激响应粗估计的长度。 [0051] 2, equation (1) is configured to produce a matrix T according to the dimension of length T is equal to the impulse response of a crude estimate. 构造矩阵T是一个满足T = TH关系的方阵,这里TH表示构造矩阵T的共轭转置,当构造矩阵T的维数为L时,其形式如下所示: Configuration is a square matrix T satisfying the relationship of T = TH, where TH represents the structure of the matrix conjugate transpose of T, when T dimension matrix configuration is L, the following form:

pay

[0052] [0052]

<formula>formula see original document page 7</formula> <Formula> formula see original document page 7 </ formula>

[0053] 其中, [0053] wherein,

[0054] [0054]

[0055] [0056] [0057] [0058] [0055] [0056] [0057] [0058]

[0059] [0059]

[0060] [0061] [0062] [0060] [0061] [0062]

[0063] [0063]

[0064] [0064]

<formula>formula see original document page 7</formula> <Formula> formula see original document page 7 </ formula>

k表示载波的偏置; P表示导频载波偏置的集合; a是收敛因子,满足O < a< 1 ; X(k)表示本地的参考导频信号; k represents the carrier offset; P represents a set of pilot carrier offset; a is the convergence factor, satisfying O <a <1; X (k) represents the local reference pilot signal;

『w* -expCZ,),是逆傅里叶变换因子。 "W * -expCZ,), is the inverse Fourier transform factor.

3、计算互相关矢量R, R的长度等于矩阵T的维数L,互相关矢量R的形式如下 3, the cross-correlation vector calculating R, R equal to the length L T of the dimension of the matrix, cross-correlation vector form as follows R

R= [r(O),......r(Ll)]T; (3) R = [r (O), ...... r (Ll)] T; (3)

其中, among them,

<formula>formula see original document page 7</formula> <Formula> formula see original document page 7 </ formula>

Y(k)表示接收到的导频信号;[0065] a含义同上。 Y (k) represents the received pilot signal; [0065] a same meaning as above.

[0066] 4、根据式(5)获得信道冲激响应的细估计结果。 [0066] 4, to obtain a fine estimation result of the channel impulse response according to formula (5).

[0067] Hm,n+1 = Hm,n+R-THm,n (5) [0068] 其中, [0067] Hm, n + 1 = Hm, n + R-THm, n (5) [0068] wherein,

[0069] Hm,n表示某一帧中的第m个0F匿符号第n次信道冲激响应的细估计结果,n = 0, 1,2,…。 [0069] Hm, n represents a m-th frame is the n th symbol 0F anonymous channel impulse response estimation result of the fine, n = 0, 1,2, .... n = 0时,Hm,。 When n = 0, Hm ,. 是信道冲激响应的粗估计,= H。 The crude is estimated channel impulse response, = H. ,。 . , H。 , H. ,。 . 是前缀的信道冲激响应估计结果。 Prefix channel impulse response estimation result. Hm,n是个矢量,长度等于构造矩阵T的维数。 Hm, n is the vector length equal to the dimension of the matrix T configuration.

[0070] 5、对Hm,n+1进行N点FFT,即可获得所有N个载波的信道估计结果,N指的是系统所有载波的数目。 [0070] 5, Hm, n + 1 N-point an FFT, to obtain all channel estimation results of the N carriers, N refers to the number of all system carriers.

[0071] 6、从N个载波的信道估计结果中选择有用的数据载波信道估计结果并输出。 [0071] 6, the result selecting useful data carrier channel estimation result and output from the channel estimate of the N carriers.

[0072] 和上述步骤对应的信道估计装置包括如下模块: [0072] The above-described steps and the corresponding channel estimation device comprises the following modules:

[0073] 1、互相关矢量产生器,其作用是产生式子(3)所示的互相关矢量R。 [0073] 1, the cross-correlation vector generator, a function of generating the expression shown in (3) cross correlation vector R.

[0074] 2、构造矩阵产生器,其作用是根据信道冲激响应粗估计器产生构造矩阵T,矩阵T [0074] 2, the configuration of matrix generator which functions according to the channel impulse response estimator generates coarse structure matrix T, T matrix

的维数为L。 The dimension is L.

[0075] 3、信道冲激响应粗估计器,根据前缀、判决反馈或者上一个0F匿符号的冲激响应信息计算信道的冲激响应粗估计。 [0075] 3, the coarse channel impulse response estimator, according to the prefix, a decision feedback or impulse response 0F anonymous symbol impulse response of the channel information calculation rough estimate.

[0076] 4、数据选择器,其作用是选择信道冲激响应的粗估计或者递归等式(5)的结果作为乘法器的一个输入。 [0076] 4, the data selector, which role is to select the channel impulse response or recursive coarse estimation equation (5) as a result of a multiplier input.

[0077] 5、乘法器,其作用是计算构造矩阵T和数据选择器的输出的乘积并输出。 [0077] 5, a multiplier, whose role is to calculate the product of the output of the matrix T and the configuration data selector and outputs. [0078] 6、加法器,计算互相关矢量产生器、乘法器和数据选择器的输出的和,并输出。 [0078] 6, an adder, calculate the cross correlation vector generator, and the output from the multiplier and the data selector, and outputs. [0079] 7、终止条件判定器,其作用是判断递归方程式(5)是否收敛,如果已经收敛,终止递归计算,输出信道冲激响应Hm,w,否则继续进行递归计算。 [0079] 7, the termination condition is determined, a function is determined which recursive equation (5) has converged, if the convergence has been terminated recursive computation, the output of the channel impulse response Hm, w, otherwise continue recursively calculated.

[0080] 8、FFT变换器,其作用是对终止条件判定器的输出Hm,n+1进行N点FFT, N指的是系统所有载波的数目。 [0080] 8, FFT converter which effect the termination condition is determined output Hm, n + 1 N-point an FFT, N refers to the number of all system carriers.

[0081] 9、信道估计结果选择器,从N个载波的信道估计结果中选择有用的数据载波信道估计并输出。 [0081] 9, the channel estimation result of the selector, the result selecting useful data and outputs the carrier channel estimate from the channel estimate of the N carriers.

[0082] 图1中的接收机中,前端处理模块101通过接收天线接收射频信号,然后对接收信 The [0082] receiver in FIG. 1, the front end processing module 101 receives radio frequency signals via the receiving antenna, then the received signal

号进行下变频、模数转换、去循环前缀等处理,最后,数据被输出到FFT模块102。 Number for down-conversion, analog-digital conversion, and the like to a cyclic prefix, and finally, data is outputted to the FFT module 102.

[0083] FFT模块102对输入的数据进行快速傅立叶变换,这样数据由时域变换到了频域。 [0083] FFT module 102 of the input data for a fast Fourier transform, so that data is transformed from the time domain to the frequency domain.

FFT模块102把来自数据载波的数据输出到信道补偿模块104,来自导频载波的数据输出到 FFT module 102 outputs data to the data carriers from the channel compensation block 104, the output data from the pilot carrier to

信道估计模块103。 Channel estimation module 103.

[0084] 信道补偿模块104接收FFT模块102输出的用户数据和信道估计模块103输出的数据载波信道估计,并利用数据载波的信道估计对用户数据进行幅度和相位上的补偿。 [0084] The channel compensation block 104 receives the user data and channel estimation FFT 102 output module 103 outputs a data carrier channel estimation module, and using channel estimation data carriers the user data on the amplitude and phase compensation. [0085] 最后,数据被输出到解调解码模块105进行后续处理。 [0085] Finally, data is output to the demodulation decoding module 105 for subsequent processing. [0086] 图2是本发明提出的信道估计器的内部实现示意图。 [0086] FIG. 2 proposed by the invention is an internal channel estimator implementation of FIG.

[0087] 信道冲激响应粗估计器201根据前缀、判决反馈或上一个0F匿符号的冲激响应信息获得信道的冲激响应粗估计。 [0087] The channel impulse response estimation information obtained crude impulse response of the channel impulse response based on rough estimates prefix 201, or a decision feedback symbol 0F anonymous.

[0088] 构造矩阵产生器202根据信道冲激响应粗估计器确定的矩阵的维数按照式子(1) 产生相应维数的构造矩阵T。 [0088] The matrix generator 202 is configured according to a channel impulse response estimator determines the dimension of the coarse matrix (1) is configured to generate the corresponding number of dimensions according to the matrix equation T.

8[0089] 互相关矢量产生器203根据本地的参考导频信号和接收端的导频信号,产生式子(3)所示的互相关矢量R。 8 the cross correlation vector [0089] The cross correlation vector generator 203 and the pilot signal of the pilot signal receiving end according to the local reference pilot is generated as shown in equation (3) is R.

[0090] 数据选择器204是用来选择每个符号每次递归的初始值,如果是第一个符号,第一次初始值Hu等于前缀冲激响应H。 [0090] The data selector 204 is used to select the initial value of each symbol of each recursion, if a first symbol, the first initial value is equal to the prefix Hu impulse response H. ,。 . ,否则每次初始值Hm,。 Otherwise, every time initial value Hm ,. 都是上一个OF匿符号的冲激响应H"n。 It is the impulse response of a symbol anonymous OF H "n.

[0091] 乘法器205是计算构造矩阵产生器和数据选择器的输出的乘积并输出。 [0091] The multiplier 205 calculates the product of the output matrix generator and configured to select and output the data.

[0092] 加法器206是计算互相关矢量产生器、乘法器和数据选择器的输出的和,并输出。 [0092] The adder 206 is to calculate the cross-correlation vector generator, and the output from the multiplier and the data selector, and outputs.

[0093] 终止条件判定器207是用来判定递归计算的结束。 [0093] The termination condition determiner 207 is used to determine the end of the recursive computation.

[0094] 快速傅里叶变换器208是对终止条件判定器输出的信道估计Hm, n+1求N点的傅里叶变换,这里N指的是系统所有载波的数目。 [0094] The fast Fourier transformer 208 is the channel output termination condition determination estimates Hm, n + 1 N-point Fourier transform required, where N refers to the number of all system carriers.

[0095] 信道估计结果选择器209是从N个载波的信道估计结果中选择有用数据载波的信道估计并输出。 [0095] The channel estimation result selector 209 is to select the useful data carrier and the channel estimation result output from the channel estimate of the N carriers.

[0096] 图3对应着信道估计实现示意图的流程图。 [0096] FIG. 3 corresponds to a schematic flowchart showing the channel estimation implemented.

[0097] 步骤301根据前缀、判决反馈或上一个OF匿符号的冲激响应等信息计算信道的冲激响应粗估计,这个粗估计相当于每次递归计算的初始值Hm,。 [0097] Step 301 calculates impulse response a crude estimate the channel according to the information of the prefix, the impulse response or decision feedback OF anonymous a symbol or the like, the initial value corresponding to a crude estimate of each recursive calculation Hm ,. ,如果是某一帧的第一个OFDM 符号,递归计算的初始值Hu选择前缀的冲激响应估计H。 If the first OFDM symbol of a certain frame, the initial values ​​for the recursive computation prefix Hu selected impulse response estimate H. ,。 . ,否则选择上一个符号的冲激响应估计Hm—u。 Otherwise, choose a symbol impulse response estimates Hm-u. 根据信道冲激响应粗估计的长度确定矩阵T的维数。 The crude estimate of the channel impulse response length dimension of the matrix T is determined.

[0098] 步骤302根据导频、前缀或上一个OF匿符号的信道冲激响应信息确定矩阵T的维数,根据式子(1)产生构造矩阵T。 [0098] Step 302 based on the pilot, or on a channel prefix OF anonymous symbol impulse response information for determining the dimension of the matrix T, (1) generation matrix is ​​configured according to Equation T. 以基于802. 16协议的0FDMA系统为例,可以根据前缀信息获得信道冲激响应粗估计的长度,构造矩阵T的维数等于这个长度。 In 0FDMA 802.16 protocol based system as an example, may be responsive to information obtained rough estimate of the channel impulse prefix according to the length, the dimension of the matrix T is equal to the configuration of this length. 本发明不限制利用导频、前缀或上一个OF匿符号的信道冲激响应信息确定矩阵T维数的方法。 The present invention is not limited using the pilot channel impulse OF anonymous prefix or a symbol on the method of determining the response information matrix T Dimension. 仿真表明,本发明对信道冲激响应长度的准确性不敏感。 Simulation results show that the present invention is the length of the channel impulse response is not sensitive to the accuracy.

[0099] 步骤303根据本地的参考导频信号和接收端的导频信号的互相关r (p),根据式子 [0099] Step 303 local cross-correlation r of the reference pilot signal and the receiving end of the pilot signal (p), according to Equation

(3)所示产生互相关矢量R,矢量R的长度等于矩阵T的维数。 As shown in the cross-correlation vector to produce R (3), the length of vector R T is equal to the dimension of the matrix.

[0100] 步骤304根据构造矩阵T和互相关矢量R计算递归等式(5)。 [0100] Step 304 calculates the recursive equation (5) The configuration of the matrix and the crosscorrelation vector T R.

[0101] 步骤305根据每次的递归运算结果判定递归计算是否结束,终止条件的判定可以 [0101] Step 305 determines whether the end of the recursive computation in accordance with each of the recursive computation result, the termination condition may be determined

有两种: There are two types:

[0102] —种是判定连续两次递归运算的结果的均分差是否小于一固定常数,比如0. 01。 [0102] - species are twice recursive computation result of determination of average difference is less than a fixed constant, such as 0.01. 是,输出冲激响应Hm,n+1,步骤306是把上次的递归结果Hm,n+1作为下一次递归的输入Hm,n,继续递归计算。 , The output impulse response Hm, n + 1, step 306 is the result of the last recursive Hm, n 1 as the recursive input Hm, n +, calculated recursively.

[0103] 另一种是固定递归次数n,递归计算等式(5)n次,然后输出冲激响应Hm,w。 [0103] Another fixed number of recursions n, the recursive calculation equation (5) n times, then the output impulse response Hm, w.

[0104] 步骤307把Hm,n+1作为下一个OFDM符号的递归计算初始值Hm+1,。 [0104] Step 307 Hm, n + 1 as the next OFDM symbol recursively calculating an initial value of Hm + 1 ,. .

[0105] 步骤308是对信道的冲激响应Hm,n+1做N点FFT,结果是所有N载波的信道估计,N [0105] Step 308 is the channel impulse response Hm, n + 1 do N-point FFT, the result is that all channel estimation carriers N, N

指的是系统所有载波的数目。 It refers to the number of all system carriers.

[0106] 步骤309是从N个载波的信道估计中选择有用的数据载波信道估计并输出,N指的是系统所有载波的数目。 [0106] Step 309 is to select the useful data carrier outputted from the channel estimation and channel estimation of N carriers, N refers to the number of all system carriers.

[0107] 上面是对本发明的一个实施例的描述,熟悉本技术领域的人员应理解,对本发明的实施例的各种修正和变化都落在本发明的构思和所附权利要求限定范围内。 [0107] The above is a description of embodiments of the present invention, those skilled in the art will appreciate that various modifications and variations of the embodiments of the present invention fall within the spirit of the present invention and the appended claims define the scope of the claims.

Claims (7)

  1. 一种正交频分复用移动通信系统的信道估计方法,其特征在于,包括以下处理:第一步骤,根据前缀、或者判决反馈信息、或上一个正交频分复用符号的冲激响应信息获得相应符号信道的冲激响应粗估计;第二步骤,根据本地参考导频信号产生构造矩阵,所述构造矩阵为共轭转置方阵,其维数为所述信道冲激响应粗估计的长度,所述构造矩阵的元素t(p)按(1)式计算; <mrow> <mi>t</mi> <mrow> <mo>(</mo> <mi>p</mi> <mo>)</mo> </mrow> <mo>=</mo> <mo>-</mo> <mi>a</mi> <munder> <mi>&Sigma;</mi> <mrow> <mi>k</mi> <mo>&Subset;</mo> <mi>P</mi> </mrow> </munder> <msup> <mrow> <mo>|</mo> <mi>X</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>|</mo> </mrow> <mn>2</mn> </msup> <msubsup> <mi>W</mi> <mi>N</mi> <mrow> <mo>-</mo> <mi>kp</mi> </mrow> </msubsup> <mo>,</mo> <mi>P</mi> <mo>=</mo> <mn>0,1</mn> <mo>,</mo> <mo>.</mo> <mo>.</mo> <mo>.</mo> <mo>,</mo> <mi>L</mi> <mo>-</mo> An orthogonal frequency division multiplex channel estimation method for a mobile communication system, characterized by comprising the processes of: a first step, feedback information from a prefix, or judgment, or an orthogonal frequency-division multiplexing symbol impulse response obtaining respective information symbol channel impulse response estimating crude; a second step of generating a matrix configuration according to the local reference pilot signal, the matrix is ​​configured conjugate transpose matrix, whose dimension is the coarse estimate of the channel impulse response the length, the construction elements t (p) according to equation (1) is calculated matrix; <mrow> <mi> t </ mi> <mrow> <mo> (</ mo> <mi> p </ mi> <mo>) </ mo> </ mrow> <mo> = </ mo> <mo> - </ mo> <mi> a </ mi> <munder> <mi> & Sigma; </ mi> <mrow > <mi> k </ mi> <mo> & Subset; </ mo> <mi> P </ mi> </ mrow> </ munder> <msup> <mrow> <mo> | </ mo> <mi > X </ mi> <mrow> <mo> (</ mo> <mi> k </ mi> <mo>) </ mo> </ mrow> <mo> | </ mo> </ mrow> < mn> 2 </ mn> </ msup> <msubsup> <mi> W </ mi> <mi> N </ mi> <mrow> <mo> - </ mo> <mi> kp </ mi> < / mrow> </ msubsup> <mo>, </ mo> <mi> P </ mi> <mo> = </ mo> <mn> 0,1 </ mn> <mo>, </ mo> < . mo> </ mo> <mo> </ mo> <mo> </ mo> <mo>, </ mo> <mi> L </ mi> <mo> -.. </ mo> <mn>1</mn> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>式中,k表示载波的偏置;P表示导频载波偏置的集合;a是收敛因子,满足0<a<1;X(k)表示本地的参考导频信号;是逆傅里叶变换因子;第三步骤,根据本地参考导频信号和接收到的导频信号计算互相关矢量,所述互相关矢量的长度等于所述构造矩阵的维数,所述互相关矢量的元素r(p)按(2)式计算; <mrow> <mi>r</mi> <mrow> <mo>(</mo> <mi>p</mi> <mo>)</mo> </mrow> <mo>=</mo> <mi>a</mi> <munder> <mi>&Sigma;</mi> <mrow> <mi>k</mi> <mo>&Subset;</mo> <mi>P</mi> </mrow> </munder> <mi>Y</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <msup> <mi>X</mi> <mo>*</mo> </msup> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <msubsup> <mi>W</mi> <mi>N</mi> <mrow> <mo>-</mo> <mi>kp</mi> </mrow> </msubsup> <mo>,</mo> <mi>P</mi> <mo>=</mo> <mn>0</mn> <mo>,</mo> <mo>.</mo> <mo>.</mo> <mo>.</mo> <mo>,</mo> <mi> <Mn> 1 </ mn> <mo> - </ mo> <mo> - </ mo> <mo> - </ mo> <mrow> <mo> (</ mo> <mn> 1 </ mn > <mo>) </ mo> </ mrow> </ mrow> formulas, k represents a carrier offset; P represents a set of pilot carrier offset; a is convergence factor, satisfying 0 <a <1; X (k) represents the local reference pilot signal; factor is an inverse Fourier transform; a third step of calculating the cross correlation vector of the pilot signal according to a local reference pilot signal and the pilot received, the length of the cross-correlation vector is equal to said dimension of the matrix structure, the elements of the cross correlation vector r (p) by (2) is calculated; <mrow> <mi> r </ mi> <mrow> <mo> (</ mo> <mi> p </ mi> <mo>) </ mo> </ mrow> <mo> = </ mo> <mi> a </ mi> <munder> <mi> & Sigma; </ mi> <mrow> <mi > k </ mi> <mo> & Subset; </ mo> <mi> P </ mi> </ mrow> </ munder> <mi> Y </ mi> <mrow> <mo> (</ mo> <mi> k </ mi> <mo>) </ mo> </ mrow> <msup> <mi> X </ mi> <mo> * </ mo> </ msup> <mrow> <mo> ( </ mo> <mi> k </ mi> <mo>) </ mo> </ mrow> <msubsup> <mi> W </ mi> <mi> N </ mi> <mrow> <mo> - </ mo> <mi> kp </ mi> </ mrow> </ msubsup> <mo>, </ mo> <mi> P </ mi> <mo> = </ mo> <mn> 0 </ mn> <mo>, </ mo> <mo>. </ mo> <mo>. </ mo> <mo>. </ mo> <mo>, </ mo> <mi> L</mi> <mo>-</mo> <mn>1</mn> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>式中,Y(k)表示接收到的导频信号;a是收敛因子,满足0<a<1;第四步骤,根据构造矩阵、互相关矢量,通过递归等式获得信道冲激响应的细估计结果,所述递归等式为;Hm,n+1=Hm,n+R-THm,n,式中,Hm,n表示某一帧中的第m个正交频分复用符号第n次信道冲激响应的细估计结果,n=0,1,2,…;第五步骤,判定根据递归等式获得的细估计结果是否收敛,是,输出该冲激响应的细估计结果,否,继续进行递归等式的计算;第六步骤,对输出冲激响应的细估计结果进行系统所有载波数目的快速傅里叶变换,获得所有载波数目的信道估计结果;第七步骤,从系统所有载波数目的信道估计结果中选择有用的数据载波信道估计结果并输出。 L </ mi> <mo> - </ mo> <mn> 1 </ mn> <mo> - </ mo> <mo> - </ mo> <mo> - </ mo> <mrow> <mo > (</ mo> <mn> 2 </ mn> <mo>) </ mo> </ mrow> </ mrow> formula, Y (k) represents the received pilot signal; a is convergence factor, satisfying 0 <a <1; the fourth step, the configuration of the matrix, cross-correlation vector obtained by a recursive equation fine estimation result of the channel impulse response, the equation is recursive; Hm, n + 1 = Hm, n + R-THm, n, in the formula, Hm, n denotes the m-th frame in a orthogonal frequency division multiplexing symbol in the n-th channel impulse response estimation result of the fine, n = 0,1,2, ...; a fifth step of recursive estimation result is determined according to the equation obtained fine converges, that the output of the fine estimation result of the impulse response, whether to continue calculation of the recursive equation; a sixth step, the output impulse response of the fine estimation results of all the number of carriers fast Fourier transform system, the number of carriers to obtain all channel estimation result; a seventh step, the result selecting useful data carrier channel estimation result and the number of all the carriers outputted from the channel estimation system. F2005100932577C00012.tif F2005100932577C00012.tif
  2. 2. 如权利要求1所述正交频分复用移动通信系统的信道估计方法,其特征在于: 所述第五步骤通过两次递归等式计算的结果的均方差是否小于一固定常数,若是,输出冲激响应的细估计结果,否则,将此次递归计算的结果作为下一次递归计算的输入,继续递归计算。 1 2. The orthogonal channel estimation method as claimed in claim multiplexing frequency division mobile communication system, wherein: said fifth step is performed by a recursive equation two results calculated mean square deviation is less than a fixed constant, if fine estimation results output impulse response, otherwise, the results of the recursive computation as the next recursive calculation of input, continue recursive computation.
  3. 3. 如权利要求1所述正交频分复用移动通信系统的信道估计方法,其特征在于:所述第五步骤固定递归次数,进行相应次数的递归计算后,输出冲激响应的细估计结果,并作为下一个正交频分复用符号的冲激响应信息。 Estimating the fifth step of fixing the fine recursion, after the recursive calculation of the appropriate number of times, the output of the impulse response: 1 3. The orthogonal channel estimation method as claimed in claim multiplexing frequency division mobile communication system, wherein as a result, and the next impulse multiplexing symbol orthogonal frequency division information as a response.
  4. 4. 如权利要求1或2或3所述正交频分复用移动通信系统的信道估计方法,其特征在于:所述信道冲激响应的细估计结果的长度等于所述构造矩阵的维数。 4. Orthogonal 1 or 2 or 3, wherein the channel estimation method in claim multiplexing frequency division mobile communication system, wherein: the fine estimation result of the channel impulse response of a length equal to the dimension of the matrix structure .
  5. 5. —种实现正交频分复用移动通信系统的信道估计方法的装置,其特征在于包括:信道冲激响应粗估计器,根据前缀、判决反馈或上一个正交频分复用符号的冲激响应信息获得信道的冲激响应粗估计;构造矩阵产生器,根据本地参考导频信号产生构造矩阵,所述构造矩阵为共轭转置方阵,其维数为所述信道冲激响应粗估计的长度,所述构造矩阵的元素t(p)按(1)式计算; <formula>formula see original document page 3</formula>式中,k表示载波的偏置;P表示导频载波偏置的集合;a是收敛因子,满足O < a < 1 ; X(k)表示本地的参考导频信号<formula>formula see original document page 3</formula>是逆傅里叶变换因子;互相关矢量产生器,根据本地的参考导频信号和接收到的导频信号计算产生互相关矢量,所述互相关矢量的长度等于所述构造矩阵的维数,所述互相关矢量的元素r(p)按(2) 5. - kind of apparatus for implementing the estimation method of a mobile communication channel multiplexing OFDM system, comprising: a channel impulse response estimator crude, an orthogonal frequency division multiplexing symbol on the feedback from a prefix, the judgment or impulse response information obtaining rough channel impulse response estimate; matrix generator configured, pilot signal generating configuration according to the local reference pilot matrix, the matrix is ​​configured conjugate transpose matrix, which is a dimension of the channel impulse response crude estimates of the length of the construction elements t (p) by the matrix (1) is calculated; <formula> formula see original document page 3 </ formula> formulas, k represents a carrier offset; P represents a pilot carrier set offset; a is the convergence factor, satisfying O <a <1; X (k) represents the local reference pilot signal <formula> formula see original document page 3 </ formula> is the inverse Fourier transform factor; mutual correlation vector generator, according to a local frequency reference pilot signal and the received pilot signal vector calculated to produce the cross-correlation, the cross correlation vector is equal to the length dimension of the matrix is ​​configured, the elements of the cross correlation vector r ( p) by (2) 式计算;<formula>formula see original document page 3</formula>式中,Y(k)表示接收到的导频信号;a是收敛因子,满足O < a< 1 ; 数据选择器,选择信道冲激响应的粗估计或者递归等式的结果作为乘法器的一个输入,所述递归等式为:Hm,n+1 = Hm,n+R-THm,n,式中,Hm, n表示某一帧中的第HI个正交频分复用符号第n次信道冲激响应的细估计结果,n = 0, 1, 2,…; 乘法器,计算构造矩阵和数据选择器输出的乘积并输出; 加法器,计算互相关矢量产生器、乘法器和数据选择器输出的和,并输出; 终止条件判定器,判断递归等式是否收敛,如果已经收敛,终止递归等式计算,输出信道冲激响应,否则继续进行递归等式计算;快速傅里叶变换器,对终止条件判定器的输出进行系统载波数目的快速傅里叶变换; 信道估计结果选择器,从所有载波数目的信道估计结果中选择有用的 Calculated; <formula> formula see original document page 3 </ formula> formula, Y (k) represents the received pilot signal; a is the convergence factor, satisfying O <a <1; the data selector selects a channel impulse results crude stimulated response estimate or a recursive equation as an input to the multiplier, the recursive equation is: Hm, n + 1 = Hm, n + R-THm, n, in the formula, Hm, n represents a HI frame of orthogonal frequency division multiplexing symbol in the n-th channel impulse response estimation result is small, n = 0, 1, 2, ...; the product of the multiplier, and the matrix calculation configuration data and outputs the selected output ; adder, calculate the cross correlation vector generator, a multiplier, and output data and selecting and outputting; termination condition determiner determines recursive equation converges, if has converged, to terminate the recursive equation that outputs a channel impulse in response, otherwise continue recursively calculated from the equation; fast Fourier transformer, the output termination condition determiner performs a number of system carrier fast Fourier transform; selector channel estimation result from the channel estimation results of all the number of carriers select useful 据载波信道估计并输出。 It carrier channel estimates and outputs.
  6. 6. 如权利要求5所述实现正交频分复用移动通信系统的信道估计方法的装置,其特征在于:所述终止条件判定器,判定连续两次递归运算的结果的均方差是否小于一固定常数, 若是,输出冲激响应细估计结果,否则,将此次递归计算的结果作为下一次递归计算的输入,继续递归计算。 5 The apparatus for implementing the estimation method of a mobile communication channel multiplexing OFDM system, wherein as claimed in claim 6: said terminating condition determining device determines that two consecutive recursive computation result of the mean square deviation is less than a fixed constant, if the output of the fine impulse response estimation result, otherwise, the results of the recursive computation as the next input recursive computation, the recursive computation continues.
  7. 7. 如权利要求5所述实现正交频分复用移动通信系统的信道估计方法的装置,其特征在于:所述终止条件判定器固定递归次数,进行相应次数的递归计算后,输出冲激响应的细估计结果,并作为下一个正交频分复用符号的冲激响应信息。 7. The apparatus of claim 5, wherein the implemented channel estimation method of a mobile communication system multiplexing orthogonal frequency division claim, wherein: said fixed number of recursive termination condition is determined, a corresponding number of times after the recursive calculation of the output impulse fine response estimation result, and the next impulse multiplexing symbol orthogonal frequency division information as a response.
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