CN101488936A - Wireless transmission system, receiver and inter-carrier interference elimination method thereof - Google Patents

Abstract

An intercarrier disturbance elimination method is used for eliminating intercarrier disturbance of received cells. Firstly, transmission cells are received through a wireless channel in the period of cell so as to obtain received cells. The transmission cell comprises P same original partial data. The received cell comprises P received partial data, respectively corresponding to the original partial data. Then, at least two of the P received partial data are copied on a time slot so as to obtain at least two copied partial data. Each copied partial data comprises P copies of the corresponding received partial data. P is a positive integral greater than 1. The estimated intercarrier disturbance of the time slot is determined according to the product of difference between the at least two copied partial data and constant sequence. At last, output cells are obtained by the received cells minus the estimated intercarrier disturbance.

Description

Wireless transmitting system, its receiver and its inter-carrier interference elimination method

Technical field

The invention relates to a kind of estimation and removing method of cell inter-carrier interference, and particularly relevant for the estimation and the removing method of the cell inter-carrier interference of low complex degree on a kind of time domain.

Background technology

In recent years, (Orthogonal frequency division multiplexing, OFDM) mechanics of communication system is widely used in the communication system in the orthogonal frequency division multitask.In order to be adapted at Data transmission in the radio channel environment, system elongates its cell time, and (Cyclic prefix CP), spreads with the multipath delay of antagonism radio channel to increase cyclic-prefix.Yet because cell time is longer, system is very responsive to carrier frequency shift.In mobile environment, radio channel environment can change in time.When speed is very fast, radio channel can cannot not become fixingly in a cell time, and this moment, flexible road can destroy the orthogonality of cell, and produced Doppler's diffusion (Doppler spread) on frequency domain, cause receiving terminal inter-carrier interference (Inter-Carrier Interference, ICI).

For overcoming the inter-carrier interference problem, the method that existing many inter-carrier interference are eliminated is suggested.These a little methods are broadly divided into two classes.In the first kind method, mainly be divided into the inter-carrier interference that two-stage is eliminated cell.Flexible road estimation when its first order is mainly done, the elimination disturbed is then done in the second level, time domain guiding signal or frequency domain guiding signal (pilot) by particular design, can with the time flexible road estimate out, utilize linear or nonlinear cell method for detecting then, carry out the detecting and the interference eliminated of carrier value.

The method of an other class is called inter-carrier interference oneself null method (Inter-carrier interferenceself-cancellation scheme).In the method, the primary carrier modulation that institute's tendency to develop is sent in the transmission end and positive and negative polarity (Anti-polar) carrier wave that be staggeredly placed adjacent to several.Each primary carrier all maps to a group positive polarity and reversed polarity carrier wave.During reception, directly each positive polarity is combined with doing after the reversed polarity carrier wave is multiplied by sign respectively, can reach and be downloaded to the purpose of disturbing the oneself to eliminate between ripple.Therefore the method can make the service efficiency of frequency spectrum reduce several times because each primary carrier all corresponds to the positive and negative polarity carrier wave of a group.

Summary of the invention

The object of the present invention is to provide a kind of wireless transmitting system, its receiver and its inter-carrier interference elimination method.

The present invention be relevant for a kind of on time domain the estimation and the removing method of low complex degree inter-carrier interference.Utilize the data that have repeat property in the cell, use the inter-carrier interference elimination method of the embodiment of the invention,, can estimate effectively with elimination to have received the suffered inter-carrier interference of cell as long as carry out simple addition and multiplication mutually.In other example of the present invention, a cyclic-prefix data length collocation method can be used in the transmission end, and receiving terminal is used the inter-carrier interference elimination method of the embodiment of the invention, can effectively remove most inter-carrier interference.

The first aspect of example according to the present invention proposes a kind of inter-carrier interference elimination method, in order to eliminate an inter-carrier interference that has received cell (Inter-carrier interference, ICI).This method may further comprise the steps.At first, in cell time, receive transmit cell, received cell by radio channel.Transmit cell comprises P identical initial protion data.Receive cell and comprised P receiving unit data, corresponding above-mentioned initial protion data respectively.Then, on time domain, duplicate P the receiving unit data at least its two, obtain at least two and duplicate partial data.Whenever duplicate P the copy that partial data comprises its pairing data of receiving unit.P is the positive integer greater than 1.Duplicate the difference and the product of constant ordered series of numbers that part information subtracts each other according at least two afterwards, inter-carrier interference is estimated in decision.To receive cell then and deduct the estimation inter-carrier interference, obtain exporting cell.

According to the second aspect of example of the present invention, a kind of receiver is proposed, be used to receive a transmit cell that is produced by a conveyer by a radio channel in the cell time, obtain one and received cell, and eliminate the inter-carrier interference that has received cell.Transmit cell comprises P initial protion data.Each initial protion data comprises several original time domain sampled datas.Each initial protion data is identical.Received cell and comprised several receiving unit data, respectively corresponding initial protion data.Receiver comprise a data simultaneous module, an inter-carrier interference estimating module, an inter-carrier interference remove module, a fast Fourier transformer, with a demodulator.Data simultaneous module is carried out receiving cell synchronously.The inter-carrier interference estimating module lie in duplicate on the time domain above-mentioned P the receiving unit data at least its two, obtain at least two and duplicate partial data.Each duplicates P the copy that partial data comprises its pairing data of receiving unit.P is the positive integer greater than 1.The inter-carrier interference estimating module is also duplicated the difference and the product of a constant ordered series of numbers that part information subtracts each other according at least two, determines one to estimate inter-carrier interference.Inter-carrier interference removal module will receive cell and deduct the estimation inter-carrier interference, obtain an output cell.Fast fourier transform will be exported cell and be converted to a frequency domain.Demodulator is exported in the frequency domain demodulation.

According to the third aspect of example of the present invention, a kind of wireless transmitting system is proposed, comprise a conveyer and a receiver.Conveyer system produces and transmits a transmit cell of time domain.Transmit cell comprises P initial protion data.Each initial protion data comprises several original time domain sampled datas.Every primary reception partial data is identical.Receiver receives transmit cell by a radio channel in a cell time, obtain one and received cell.Receive cell and comprised P receiving unit data, corresponding P initial protion data respectively.Receiver comprise a data simultaneous module, an inter-carrier interference estimating module, an inter-carrier interference remove module, a fast Fourier transformer, with a demodulator.Data simultaneous module system carries out receiving cell synchronously.The inter-carrier interference estimating module lie in duplicate on the time domain above-mentioned P the receiving unit data at least its two, obtain at least two and duplicate partial data.Each duplicates P the copy that partial data comprises its pairing data of receiving unit.P is the positive integer greater than 1.The inter-carrier interference estimating module is also duplicated the difference and the product of a constant ordered series of numbers that part information subtracts each other according at least two, determines one to estimate inter-carrier interference.Inter-carrier interference removal module will receive cell and deduct the estimation inter-carrier interference, obtain an output cell.Fast fourier transform will be exported cell and be converted to a frequency domain.Demodulator is exported in the frequency domain demodulation.

According to the fourth aspect of example of the present invention, a kind of inter-carrier interference elimination method is proposed, in order to eliminate an inter-carrier interference that has received cell.This method may further comprise the steps.At first, in a cell time, receive a transmit cell that is produced by a conveyer, obtain one and received cell by a radio channel.Transmit cell comprises an initial data cell and a cyclic-prefix data.The cyclic-prefix data are identical with the back segment data of initial data cell.Received cell and comprised that accordingly a data accepted cell and has received the cyclic-prefix data, respectively corresponding initial data cell and cyclic-prefix data.Segment data after the segment data correspondence after one of data accepted cell has received.Then, according to received the cyclic-prefix data to small part and the difference and the product of a constant ordered series of numbers of subtracting each other to small part that have received the back segment data, determine one to estimate inter-carrier interference.Afterwards, will receive cell and deduct the estimation inter-carrier interference, obtain an output cell.

The 5th aspect according to example of the present invention proposes a kind of wireless transmitting system, comprises a conveyer and a receiver.Conveyer system produces and transmits a transmit cell of time domain.Transmit cell is a cell, comprises an initial data cell and a cyclic-prefix data.The cyclic-prefix data are identical with an original back segment data of initial data cell.Receiver receives transmit cell by a radio channel in a cell time, obtain one and received cell.Received cell and comprised that accordingly a data accepted cell and has received the cyclic-prefix data, respectively corresponding initial data cell and cyclic-prefix data.Segment data after the segment data correspondence after one of data accepted cell has received.Receiver comprise a data simultaneous module, an inter-carrier interference estimating module, an inter-carrier interference remove module, a fast Fourier transformer, with a demodulator.Data simultaneous module is carried out receiving cell synchronously.The inter-carrier interference estimating module according to received the cyclic-prefix data to small part and the difference and the product of a constant ordered series of numbers of subtracting each other to small part that have received the back segment data, determine one to estimate inter-carrier interference.Inter-carrier interference removal module will receive cell and deduct the estimation inter-carrier interference, obtain an output cell.Fast Fourier transformer will be exported cell and be converted to a frequency domain.Demodulator is exported in the frequency domain demodulation.

The 6th aspect according to example of the present invention proposes a kind of inter-carrier interference elimination method, may further comprise the steps.At first, in a cell time, receive a transmit cell that is produced by a conveyer, received cell by a radio channel.Transmit cell comprises at least two identical initial protion data.The data of receiving unit that cell comprises at least two correspondences have been received, respectively corresponding above-mentioned two initial protion data.Afterwards, according at least two receiving unit data differences of subtracting each other and the product of a constant ordered series of numbers, determine one to estimate inter-carrier interference.Then, will receive cell and deduct the estimation inter-carrier interference, obtain an output cell.

The 7th aspect according to example of the present invention, a kind of cyclic-prefix data length collocation method is proposed, be applicable to a communication system, wherein communication system comprises at least one transmit cell, transmit cell comprises cyclic-prefix data and a cell of data, and the method comprises: the length that disposes these cyclic-prefix data is more than or equal to 1/2nd of this cell of data length.

Eight aspect according to example of the present invention, a kind of conveyer is proposed, be applicable to a communication system, in order to produce and to transmit a transmit cell of time domain, transmit cell comprises an initial data cell and cyclic-prefix data, the cyclic-prefix data are identical with an original back segment data of initial data cell, and wherein, the length of cyclic-prefix data is more than or equal to 1/2nd of this initial data cell length.

The 9th aspect according to example of the present invention proposes a kind of wireless transmitting system, comprises a conveyer and a receiver.Conveyer system is in order to produce and to transmit a transmit cell of time domain, comprise an initial data cell and cyclic-prefix data, the cyclic-prefix data are identical with an original back segment data of initial data cell, wherein, the length of cyclic-prefix data is more than or equal to 1/2nd of initial data cell length.And receiver is to receive above-mentioned transmit cell by a radio channel in a cell time, obtain one and received cell, received cell and comprised that accordingly a data accepted cell and has received the cyclic-prefix data, corresponding initial data cell of difference and cyclic-prefix data, one of data accepted cell have received the corresponding above-mentioned original back segment data of back segment data.

For foregoing of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. is described in detail below.

Description of drawings

Fig. 1 shows the flow chart of the inter-carrier interference elimination method of present embodiment.

Fig. 2 shows the calcspar of the wireless transmitting system of present embodiment.

Fig. 3 shows the flow chart of the inter-carrier interference elimination method of first embodiment.

The step 330 of Fig. 4 displayed map 3 and the detailed maps of step 340.

Fig. 5 A shows among first embodiment, an example of channel response the variation diagram during cell time of transmit cell when transmitting.

The schematic diagram of the linear approximation of the channel response of Fig. 5 B displayed map 5A.

Fig. 5 C shows the schematic diagram that duplicates the suffered channel response of partial data of corresponding diagram 5B.

Another of Fig. 5 D demonstration corresponding diagram 5B duplicates the schematic diagram of the suffered channel response of partial data.

Fig. 6 A shows among first embodiment, another example of the variation diagram of channel response in a cell time.

The schematic diagram of the channel response that Fig. 6 B displaying duplication partial data is suffered.

The schematic diagram of the channel response that Fig. 6 C displaying duplication partial data is suffered.

Fig. 7 shows the calcspar of the conveyer of first embodiment.

Fig. 8 shows through an adjusted example through the data of adjusting frequency.

Fig. 9 shows the flow chart of the inter-carrier interference elimination method of second embodiment.

Figure 10 shows among second embodiment, an example of channel response the variation diagram during cell time of transmit cell when transmitting.

Figure 11 shows the calcspar of the conveyer of second embodiment.

Figure 12 shows when transmit cell has repeating data, use inter-carrier interference elimination method, traditional inter-carrier interference oneself's removing method of present embodiment and do not use the resulting Doppler of any inter-carrier interference elimination method spread and the inter-carrier interference energy between an example of graph of a relation.

Figure 13 shows when transmit cell has repeating data, received the real part (Real part) of the suffered inter-carrier interference of cell reality and the real part of the estimation carrier wave estimating out according to the inter-carrier interference elimination method of present embodiment between relation.

Figure 14 shows when transmit cell has repeating data, received the imaginary part (Image part) of the suffered inter-carrier interference of cell reality and the imaginary part of the estimation carrier wave estimating out according to the inter-carrier interference elimination method of present embodiment between relation.

Figure 15 is presented under different Doppler diffusion and the different Gaussian noise intensity, transmits channel estimation Mean Square Error (Mean square error, example MSE) of the advance data (Preamble) of 802.16e.

Figure 16 shows when transmit cell is cell, under the cyclic-prefix data conditions of different length, has received an example of the graph of a relation of suffered inter-carrier interference of cell and Doppler diffusion.

Primary clustering symbol description in the accompanying drawing:

100: conveyer

110,110 ': modulator

120,120 ': the subcarrier adjusting module

130,130 ': anti-fast Fourier transformer (IFFT)

200: receiver

210: data simultaneous module

220: the inter-carrier interference estimating module

230: inter-carrier interference is removed module

240: fast Fourier transformer (FFT)

250: demodulator

300: radio channel

Embodiment

The inter-carrier interference elimination method of the embodiment of the invention is to utilize the data that have repeat property in the transmit cell time domain, produces different responses with it through out-of-date flexible road, estimates the inter-carrier interference that cell produces.Fig. 1 shows the flow chart of inter-carrier interference elimination method that present embodiment is carried.At first, in step 10, in a cell time, receive by the transmit cell that conveyer produced, obtain one and received cell by radio channel.The cell that this conveyer produced comprises the initial protion data of at least two repetitions on time domain.During reception its result through out-of-date flexible road response is taken out, received cell.Wherein, the data of receiving unit that cell comprises at least two correspondences have been received, the initial protion data of respectively corresponding above-mentioned two repetitions.Then, in step 20,, determine one to estimate inter-carrier interference according to above-mentioned at least two the receiving unit data differences of subtracting each other and the product of a constant ordered series of numbers.Afterwards, in step 30, the cell time domain signal with receiving deducts above-mentioned estimation inter-carrier interference, promptly obtains an output cell of having eliminated inter-carrier interference.

Fig. 2 shows the wireless transmitting system calcspar of present embodiment.As shown in Figure 2, the wireless transmitting system of present embodiment comprises a conveyer 100 and a receiver 200.The conveyer 100 of present embodiment produces and transmits a transmit cell Dt.Wherein, the transmit cell Dt that produced of conveyer 100 comprises the initial protion data Dprt of at least two repetitions on time domain.

The receiver 200 of present embodiment comprises a data simultaneous module 210, an inter-carrier interference estimating module 220, inter-carrier interference removal module 230, a fast Fourier transformer (Fast FourierTransformer, FFT) 240 and one demodulator 250.Receiver 200 is inter-carrier interference elimination methods of execution graph 1.Repeat kenel according to data different in the transmit cell, the operation of conveyer and the receiver of Fig. 2 is described with two embodiment.In this two embodiment, be that (Orthogonal frequency divisionmultiplexing, OFDM) mechanics of communication is that example describes so that the conveyer of Fig. 2 and receiver are applied to the orthogonal frequency division multitask.

First embodiment

In first embodiment, the transmit cell Dt that conveyer 100 is produced comprises N time domain sampled data.This N original time domain sampling data is divided into P initial protion data Dprt that repeats, and P is the positive integer greater than 1.Each initial protion data Dprt comprises

Individual original time domain sampling data.That is transmit cell has P repeating data.Receiver 200 receives transmit cell Dt by radio channel 300, obtains one and has received cell.Received and obtained the synchronous cell of reception Dr after cell is handled through data simultaneous module 210 earlier.Receive cell Dr and comprised that N has received the time domain sampled data, be divided into P receiving unit data Dprt ', respectively P initial protion data Dprt among the corresponding transmit cell Dt.

Fig. 3 shows the inter-carrier interference elimination method flow chart of first embodiment.The inter-carrier interference elimination method of first embodiment is to be applied to receiver 200.Please also refer to Fig. 2 and Fig. 3.In the step 310, data simultaneous module 210 receives transmit cell Dt by radio channel 300 in a cell time, received cell Dr.210 pairs of data simultaneous module have received cell Dr and have carried out the synchronous of Time And Frequency, and export the cell of the reception Dr of synchronous mistake.

Then, in step 320, inter-carrier interference estimating module 220 is taken out P receiving unit data Dprt ' in time domain, takes out at least two partial data Dprt ', and respectively different Dprt ' is carried out the time domain copy, obtain at least two and duplicate partial data Dcpy.Each duplicates P the copy that receiving unit data Dcpy comprises its pairing data of receiving unit Dprt '.

Afterwards, in step 330, inter-carrier interference estimating module 220 is duplicated the difference and the product of a constant ordered series of numbers that part information Dcpy subtracts each other according to above-mentioned at least two, determines one to estimate inter-carrier interference Dici.

Then, in step 340, inter-carrier interference is removed module 230 will receive the inter-carrier interference Dici that cell Dr deducts estimation, promptly obtain an output cell Dout who is not subjected to inter-carrier interference.

Behind removal estimation inter-carrier interference Dici, FFT 240 is converted to frequency domain with this output cell Dout.Demodulator 250 is promptly done demodulation in frequency domain to this signal.

Wherein, in the step 320, in order to duplicate receiving unit data Dprt ', inter-carrier interference estimating module 220 will receive cell Dr multiply by respectively P window matrix (Window matrix) at least its two.Multiply by i window matrix W if will receive cell Dr _i, can produce and duplicate partial data Dcpy (i).Wherein, duplicate partial data Dcpy (i) and promptly comprise i receiving unit data Dprt ' P (i) copy.Wherein, i is the positive integer that is less than or equal to P.The size of each window matrix is N * N, comprises P unit matrix, and the size of each unit matrix is I window matrix W _iIn, the 1st row of each unit matrix is positioned at the of i window matrix

OK, other element is 0.Relevant above-mentioned operation of duplicating will in after describe in detail.

The detailed maps of Fig. 4 step display 330 and step 340.Please refer to Fig. 3 and Fig. 4.Step 330 comprises two sub-steps 410 and 420.In the step 410, inter-carrier interference estimating module 220 produces above-mentioned at least two earlier and duplicates poor that partial data Dcpy subtracts each other.Then, in the substep 420 of step 330, inter-carrier interference estimating module 220 promptly obtains estimating inter-carrier interference Dici with above-mentioned difference of subtracting each other multiplication by constants ordered series of numbers again.The diagonal angle ordered series of numbers that this constant ordered series of numbers is diagonal matrix C.An example wherein, C is N * N matrix, its i is listed as the capable element of j and is

$C(i,j)=\left\{\begin{array}{cc}\frac{P}{(P-a)\&times;N}(i-\frac{N-1}{2})& i=\mathrm{<figure-callout\; id="0"\; label="j"\; filenames="A200810093195E00471.png,A200810093195E00481.png"\; state="\{\{state\}\}">j</figure-callout>}\\ 0& \mathrm{else}\end{array}\right.$ The 1st formula

Wherein, i and j are the positive integer that is less than or equal to N, and a is the positive integer less than P.

The principle of step 320 to 350 is described in detail in detail now.The applied system model of inter-carrier interference elimination method of present embodiment at first is described.As the transmit cell Dt that produced for conveyer 100 as described in the 2nd formula through having received the relation of cell Dr behind radio channel 300 and the synchronization module 210.

$\begin{array}{cc}{y}_i=\underset{k=0}{\overset{L-1}{\mathrm{\&Sigma;}}}{h}_k^{\left(i\right)}{x}_{{\left((i-k)\right)}_N}+n_i,& 0\&le;i\&le;N-1\end{array}$ The 2nd formula

Wherein N is the carrier wave number, and L is the active path number of radio channel 300, y _iFor N i of having received the time domain sampled data who receives among the cell Dr received the time domain sampled data.x _I-kBy conveyer 100 is produced i-k original time domain sampling data among the transmit cell Dt.

In radio channel 300, k path is at the time domain channel response of i time point.n _iBe illustrated in i time point Gaussian noise (Additive white Gaussian noise, AWGN).

Write the 2nd formula as matrix form (matrix form), can be obtained the 3rd formula:

$\stackrel{\&RightArrow;}{y}=H\stackrel{\&RightArrow;}{x}+\stackrel{\&RightArrow;}{n}$ The 3rd formula

Wherein,

System has received cell Dr.

Be N * 1 matrix, its i column element (Entry) equals the y of the 2nd formula _i

Be the ordered series of numbers of the transmit cell Dt of conveyer 100,

Be N * 1 matrix, its i column element equals the x of the 2nd formula _i Be the Gaussian noise ordered series of numbers, be N * 1 matrix, its i column element equals the n of second formula _iH is matrix time response of radio channel 300, and (i j) equals second formula for the j row element H of its i row

Fig. 5 A display radio passage 300 in mobile environment, the time dependent channel response in a certain path.When the translational speed of receiver 200 is not under the very high situation, shown in Fig. 5 B, at a cell time T _sInterior channel response variation can be approximated to be linearity (Linear approximation).

Therefore, k path, the channel response of an i time can be similar to as the 4th formula:

$h_k^{\left(i\right)}\&ap;h_k^{\left(\frac{N-1}{2}\right)}+((i-\frac{N-1}{2})/(N-1))\&CenterDot;{\mathrm{\&alpha;}}_k$ The 4th formula

Wherein, α _kRepresent that k path is at cell time T _sIn preceding and the most last variable quantity, therefore

${\mathrm{\&alpha;}}_k=h_k^{(N-1)}-h_k^{\left(0\right)}$ The 5th formula

In the 4th formula and the 5th formula substitution the 3rd formula, can obtain

$\stackrel{\&RightArrow;}{y}\&ap;H_{\mathrm{mid}}\stackrel{\&RightArrow;}{x}+M\&times;A\&times;\stackrel{\&RightArrow;}{x}+\stackrel{\&RightArrow;}{n}$ The 6th formula, wherein,

$H_{\mathrm{mid}}(i,j)=h_{{\left((i-j)\right)}_N}^{\left(\frac{N-1}{2}\right)}$ 0≤i, j≤N-1 the 7th formula

$A(i,j)={\mathrm{\&alpha;}}_{{\left((i-j)\right)}_{\mathrm{<figure-callout\; id="0"\; label="N"\; filenames="A200810093195E00471.png,A200810093195E00481.png"\; state="\{\{state\}\}">N</figure-callout>}}}$ 0≤i, j≤N-1 the 8th formula

$M(i,j)=\left\{\begin{array}{cc}(i-\frac{N-1}{2})/(N-1)& ,i=\mathrm{<figure-callout\; id="0"\; label="j"\; filenames="A200810093195E00471.png,A200810093195E00481.png"\; state="\{\{state\}\}">j</figure-callout>}\\ 0& ,\mathrm{else}\end{array}\right.$ The 9th formula

The 2nd on the right of the equation of the 6th formula is institute's desire estimation and the time domain inter-carrier interference Dici that eliminates, that is:

${\stackrel{\&RightArrow;}{e}}_{\mathrm{ici}}\&ap;M\&times;A\&times;\stackrel{\&RightArrow;}{x}$ The 10th formula

By the 8th formula as can be known, when speed fast more, the variation α of channel response _kBig more, therefore, the value of A matrix is big more, causes the inter-carrier interference in the 10th formula

Big more.

The 1st H on the 6th formula equation the right _MidCan be considered corresponding at cell time T _sInterior channel response approximation on the average value is among Fig. 5 B cell time T _sThe channel response of mid point.

Be at cell time T _sIn be not subjected to the part of inter-carrier interference influence.

After system model had been described, the transmit cell Dt that is produced with conveyer 100 comprised the initial protion data Dprt of two repetitions, and promptly P equals 2, is example, interpretation procedure 320 to 340.

When

At cell time T _sInterior is linear approximation, α _kCan also be expressed as:

${\mathrm{\&alpha;}}_k=h_k^{(N-1)}-h_k^{\left(0\right)}$

$=(h_k^{\left(\frac{N-1}{4}\right)}-h_k^{\left(\frac{3N-3}{4}\right)})\&times;\frac{2(N-1)}{N}$ The 11st formula

In the 11st formula,

Be time point

The time, the channel response in k path, promptly preceding half section cell time T _S1Interior average channel response.And

Be time point The time, the channel response in k path, i.e. cell time second half section T _S2Interior average channel response.

The 11st formula substitution the 10th formula can be obtained:

${\stackrel{\&RightArrow;}{e}}_{\mathrm{ici}}\&ap;\frac{2(N-1)}{N}\&times;M\&times;(H_2-H_1)\&times;\stackrel{\&RightArrow;}{x}$ The 12nd formula

Wherein,

$H_2(i,j)=h_{{\left((i-j)\right)}_N}^{\left(\frac{3N-3}{4}\right)},0\&le;i,j\&le;N-1$ The 13rd formula

$H_1(i,j)=h_{{\left((i-j)\right)}_N}^{\left(\frac{N-1}{4}\right)},0\&le;i,j\&le;N-1$ The 14th formula

Shown in Fig. 5 B, the 12nd formula is at preceding half cell time T with radio channel 300 _S1Average channel response H ₁With later half cell time T _S2Average channel response H ₂Estimate inter-carrier interference.Observe the 12nd formula as can be known, because N and matrix M are known, therefore, if obtain

Can estimate and the estimation inter-carrier interference

Based on this idea, similar the 4th formula, radio channel response

Can be respectively with

With For carrying out linear approximation as datum mark.Therefore, received cell

Can be rewritten as respectively:

$\stackrel{\&RightArrow;}{y}\&ap;H_2\stackrel{\&RightArrow;}{x}+{\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">M</figure-callout>}}_2\&times;A\&times;\stackrel{\&RightArrow;}{x}+\stackrel{\&RightArrow;}{n}$ The 15th formula

$\stackrel{\&RightArrow;}{y}\&ap;H_1\stackrel{\&RightArrow;}{x}+{\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">M</figure-callout>}}_1\&times;A\&times;\stackrel{\&RightArrow;}{x}+\stackrel{\&RightArrow;}{n}$ The 16th formula

Wherein,

$M_2(i,j)=\left\{\begin{array}{cc}i-\left(\frac{3N-2}{4}\right)/(N-1)& i=j,0\&le;i,j\&le;N-1\\ 0& \mathrm{else}\end{array}\right.$ The 17th formula

$M_1(i,j)=\left\{\begin{array}{cc}i-\left(\frac{N-2}{4}\right)/(N-1)& i=j,0\&le;i,j\&le;N-1\\ 0& \mathrm{else}\end{array}\right.$ The 18th formula

The matrix M of the 17th formula and the 18th formula ₁With M ₂Have following relation:

$M_1(i,i)=M_2(i+\frac{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">N</figure-callout>}}{2},i+\frac{N}{2})$ The 19th formula

In this example, transmit cell Dt has two identical initial protion data Dprt (1) and Dprt (2), that is:

$\stackrel{\&RightArrow;}{x}=\left[\begin{array}{c}{\stackrel{\&RightArrow;}{x}}_1\\ {\stackrel{\&RightArrow;}{x}}_2\end{array}\right]$ The 20th formula

In the 20th formula,

Extremely

Be respectively the 1st and the 2nd initial protion data Dprt (1) and Dprt (2).In this example, ${\stackrel{\&RightArrow;}{x}}_1={\stackrel{\&RightArrow;}{x}}_2.$

So in step 320, inter-carrier interference estimating module 220 is to receive cell Dr, promptly

Multiply by the 1st window matrix W ₁, obtain the 1st and duplicate partial data Dcpy (1).Shown in the 21st formula:

${\stackrel{\&RightArrow;}{y}}_1={\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">W</figure-callout>}}_1\&times;\stackrel{\&RightArrow;}{y}={\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">W</figure-callout>}}_1\&times;{\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">H</figure-callout>}}_1\&times;\stackrel{\&RightArrow;}{x}+{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">W</figure-callout>}}_1\&times;{\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">M</figure-callout>}}_1\&times;A\&times;\stackrel{\&RightArrow;}{x}+{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">W</figure-callout>}}_1\&times;\stackrel{\&RightArrow;}{n}$ The 21st formula

In the 21st formula, with the 16th formula

Multiply by W ₁

Comprise corresponding the 1st 2 copies of receiving unit data Dprt ' (1).Wherein,

${\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">W</figure-callout>}}_1=\left[\begin{array}{cc}{\mathrm{<figure-callout\; id="2"\; label="I\; N"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">I</figure-callout>}}_{\frac{N}{}}& 0_{\frac{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">N</figure-callout>}}{2}\&times;\frac{N}{2}}\\ {\mathrm{<figure-callout\; id="2"\; label="I\; N"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">I</figure-callout>}}_{\frac{N}{}}& 0_{\frac{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">N</figure-callout>}}{2}\&times;\frac{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">N</figure-callout>}}{2}}\end{array}\right]$ The 22nd formula

In this example, P equals 2.So W ₁Size be N * N, comprise that 2 sizes are

Unit matrix

Other element is 0.The 1st window matrix W ₁, i.e. i=1, in, the 1st row of each unit matrix I is positioned at the window matrix W ₁The 1st the row, promptly OK, other element is 0.

Fig. 5 C displaying duplication partial data

The schematic diagram of suffered channel response.Among Fig. 5 C, duplicate partial data

In the response of two suffered average channels of copy be equal to H ₁

Similarly, inter-carrier interference estimating module 220 will

Multiply by the 2nd window matrix W ₂, obtain the 2nd and duplicate partial data Dcpy (2).Shown in the 23rd formula:

${\stackrel{\&RightArrow;}{y}}_2={\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">W</figure-callout>}}_2\&times;\stackrel{\&RightArrow;}{y}={\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">W</figure-callout>}}_2\&times;{\mathrm{<figure-callout\; id="2"\; label="H"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">H</figure-callout>}}_2\&times;\stackrel{\&RightArrow;}{x}+{\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">W</figure-callout>}}_2\&times;{\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">M</figure-callout>}}_2\&times;A\&times;\stackrel{\&RightArrow;}{x}+{\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">W</figure-callout>}}_2\&times;\stackrel{\&RightArrow;}{n}$ The 23rd formula

In the 23rd formula, with the 15th formula

Multiply by W ₂

Comprise corresponding the 2nd 2 copies of receiving unit data Dprt ' (2).Wherein,

${\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">W</figure-callout>}}_2=\left[\begin{array}{cc}{0}_{\frac{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">N</figure-callout>}}{2}\&times;\frac{N}{2}}& {\mathrm{<figure-callout\; id="2"\; label="I\; N"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">I</figure-callout>}}_{\frac{N}{}}\\ 0_{\frac{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">N</figure-callout>}}{2}\&times;\frac{N}{2}}& {\mathrm{<figure-callout\; id="2"\; label="I\; N"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">I</figure-callout>}}_{\frac{N}{}}\end{array}\right]$ The 24th formula

W ₂Size be N * N, also comprise 2 unit matrixs

The 2nd window matrix W ₂, i.e. i=2, in, each unit matrix

The 1st row system be positioned at the window matrix W ₂

OK, promptly $((2-1)\&times;\frac{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">N</figure-callout>}}{2}+1)$ OK, other element is 0.

Similarly, Fig. 5 D displaying duplication partial data

The schematic diagram of suffered channel response.Among Fig. 5 D, duplicate partial data

In the response of two suffered average channels of copy be equal to H ₂

By the 19th, 20,22 and 24 formulas, can push away in the 21st and 23 formulas,

${\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">W</figure-callout>}}_1\&times;{\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">M</figure-callout>}}_1\&times;A\&times;\stackrel{\&RightArrow;}{x}={\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">W</figure-callout>}}_2\&times;{\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">M</figure-callout>}}_2\&times;A\&times;\stackrel{\&RightArrow;}{x}$ The 25th formula

Therefore, if the 23rd formula is deducted the 21st formula, can obtain

${\stackrel{\&RightArrow;}{y}}_2-{\stackrel{\&RightArrow;}{y}}_1=(H_2-H_1)\&times;\stackrel{\&RightArrow;}{x}+{\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">W</figure-callout>}}_2\&times;\stackrel{\&RightArrow;}{n}-{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">W</figure-callout>}}_1\&times;\stackrel{\&RightArrow;}{n}$ The 26th formula

Disregard as if Gaussian noise is left in the basket, by the 26th formula as can be known, in step 330, inter-carrier interference estimating module 220 will be duplicated partial data DCPy (1), promptly

With duplicate partial data Dcpy (2), promptly

The difference of subtracting each other gained promptly equals the 12nd formula

Therefore, in step 330, inter-carrier interference estimating module 220 is poor with gained again Multiply by a pair of angular moment battle array C, promptly obtain the estimation inter-carrier interference of the 12nd formula

Wherein, diagonal matrix C be with P equal 2, a equals 1, substitution the 1st formula obtains:

$C(i,j)=\left\{\begin{array}{cc}\frac{P}{(P-a)\&times;N}(i-\frac{N-1}{2})& i=\mathrm{<figure-callout\; id="0"\; label="j"\; filenames="A200810093195E00471.png,A200810093195E00481.png"\; state="\{\{state\}\}">j</figure-callout>}\\ 0& \mathrm{else}\end{array}\right.$ The 27th formula

In step 340, inter-carrier interference is removed module 230 and has soon been received cell Dr, promptly

Deduct the estimation inter-carrier interference Promptly estimated the output cell Dout of inter-carrier interference.

This example is that to equal 2 with P be that example is come description of step 320 to 340.Yet, the transmit cell Dt that the receiver of present embodiment and inter-carrier interference elimination method can be applied to have identical initial protion data, that is, the transmit cell with repeating data.Transmit cell Dt for having P identical initial protion data by duplicating the data of receiving unit that receive in the cell, obtains duplicating partial data; Inter-carrier interference according to duplicating the difference that partial data subtracts each other and the product of constant ordered series of numbers, can estimating again.

Because the advance data (Preamble) in the cell has the characteristic that data repeat usually, therefore, the receiver 200 and the inter-carrier interference elimination method of present embodiment can be applied to advance data.So, by the inter-carrier interference of effective elimination advance data, can increase the accuracy of advance data channel estimation.

Lift receiver and inter-carrier interference elimination method that another example illustrates present embodiment.Another example of the variation diagram of Fig. 6 A display channel response in a cell time.Please refer to Fig. 6 A, when transmit cell Dt has 3 identical initial protion data, that is P equals at 3 o'clock, and the receiver 200 of present embodiment is with a cell time T _sInterior channel response is divided into 3 parts, respectively corresponding above-mentioned 3 identical initial protion data.Average channel response H ₁', H ₂' with H ₃' be respectively radio channel 300 at cell time T _s3 partly average channel responses in the times.In addition, receiver 200 resulting reception cells comprise 3 of corresponding above-mentioned 3 initial protion data respectively receiving unit data.

Similarly, in the step 320, inter-carrier interference estimating module 220 is to receive cell

Multiply by respectively in 3 window matrixes at least its two, obtain at least two and duplicate partial data.

For instance, inter-carrier interference estimating module 220 obtains two in step 320 and duplicates partial data

With

Wherein, duplicate partial data

Be included as above-mentioned 3 and received the 1st of cell 3 copies of receiving unit data.Fig. 6 B displaying duplication partial data

The schematic diagram of suffered channel response, its average channel response equals H ₁'.

In addition, duplicate partial data Be included as above-mentioned 3 and received the 3rd of cell 3 copies of receiving unit data.Fig. 6 C displaying duplication partial data

The schematic diagram of suffered channel response.Among Fig. 6 C, its average channel response equals H ₃'.

Then, in step 330, inter-carrier interference estimating module 220 is according to duplicating partial data With That subtracts each other is poor

With diagonal matrix C ', obtain estimating inter-carrier interference

Diagonal matrix C ' is about to that P equals 3, a equals 1, substitution the 1st formula gained.Wherein,

$C\&prime;(i,j)=\left\{\begin{array}{cc}\frac{3}{2\&times;N}(i-\frac{N-1}{2})& i=\mathrm{<figure-callout\; id="0"\; label="j"\; filenames="A200810093195E00471.png,A200810093195E00481.png"\; state="\{\{state\}\}">j</figure-callout>}\\ 0& \mathrm{else}\end{array}\right.$ The 28th formula

In the present embodiment, when transmit cell comprised 3 identical initial protion data, inter-carrier interference estimating module 220 was to obtain estimating inter-carrier interference Be similar to:

${\stackrel{\&RightArrow;}{e}}_{\mathrm{ici}}\&prime;\&ap;C\&prime;\&times;({\stackrel{\&RightArrow;}{y}}_3\&prime;-{\stackrel{\&RightArrow;}{y}}_1\&prime;)$ The 29th formula

Then, in step 340, it is to deduct the estimation inter-carrier interference to receive cell, to obtain exporting cell Dout ' that inter-carrier interference is removed module 230.

In the present embodiment, inter-carrier interference estimating module 220 is not limited to duplicate partial data with reference to above-mentioned two With

Obtain estimating inter-carrier interference.Inter-carrier interference estimating module 220 can also for example be utilized and duplicate partial data according to other paired part information that duplicates

With corresponding the 2nd the receiving unit data duplicate partial data

Difference of subtracting each other and constant ordered series of numbers obtain another estimation inter-carrier interference

At this moment, Dui Ying constant ordered series of numbers is the diagonal angle ordered series of numbers of diagonal matrix C ＂.Wherein, diagonal matrix for P is equaled 1, a equals 2 substitutions the 1st formula and gets.Inter-carrier interference estimating module 220 can be according to these two estimation inter-carrier interference

Estimate and another preferable estimation inter-carrier interference.Then, inter-carrier interference removal module 230 will receive cell more and deduct the estimation inter-carrier interference that this obtains at last, obtain exporting cell.

In the present embodiment, when N was not the multiple of P, the inter-carrier interference elimination method of present embodiment also comprised step 320a (not shown) before step 320.In step 320a, 230 pairs of inter-carrier interference estimating module have received N in the cell and have received the time domain sampled data and carry out interpolative operation, obtain R interpolation time domain sampled data.Wherein, N+R is the multiple of P.Inter-carrier interference estimating module 220 is divided into P receiving unit data Dprt with this N+R time domain sampled data.

In the present embodiment, when conveyer 100 with a frequency data Df modulation to N subcarrier, to obtain transmitting data Dt.These transmission data Dt comprises by N the original time domain sampling data of modulation to N subcarrier.Wherein, when between the frequency and a reference frequency of an above-mentioned N subcarrier, for example be frequency 0, when having a frequency offset, can make the phase place of above-mentioned N original time territory sampled data have one of the correspondence phase pushing figure.

In the case, the inter-carrier interference elimination method of present embodiment before step 320, also comprises step 320b (not shown).In step 320b, 220 couples of above-mentioned N of inter-carrier interference estimating module have received the time domain sampled data and have carried out frequency shifting (Frequency shift), to compensate above-mentioned phase pushing figure.Afterwards, in step 320, the inter-carrier interference estimating module is just duplicated the above-mentioned at least two receiving unit data that receive cell through compensation.

The operation of conveyer 100 is described when desire produces identical initial protion data now.Fig. 7 shows the calcspar of the conveyer 100 of first embodiment.Please refer to Fig. 7, conveyer 100 comprises a modulator 110, a subcarrier adjusting module 120 and an anti-fast Fourier transformer (Inverse fast fouriertransformer, IFFT) 130.One modulator 110 obtains in the default frequency range of a frequency data Df modulation to

Individual frequency sample data Dm.

Then, subcarrier adjusting module 120 will

Individual frequency sample data Dm P point at interval puts N subcarrier to the above-mentioned default frequency range, and puts the sky data and extremely do not put the subcarrier of any frequency sample data, obtains one group through the data Da that adjusts frequency.

Then, 130 couples of IFFT carry out anti-fast fourier transform through the data Da that adjusts frequency, and obtain transmit cell Dt.So, transmit cell Dt promptly comprises P identical initial protion data Dprt.

Fig. 8 shows when P equals 2, after put at 2 at interval through the data x that adjusts frequency ₁Extremely

An example.As shown in Figure 8, frequency sample data x ₁Extremely

Be spaced apart and put, and inserted data (Null) in twos between frequency data.So, after IFFT 130 carries out anti-fast fourier transform, the transmit cell Dt that promptly obtains having 2 identical initial protion data.

Fig. 8 is prosperous, and to equal 2 with P be example.Yet in fact P can be for greater than 1 positive integer.So, transmitter 100 can produce the transmit cell with P identical initial protion data by the frequency interval between original subcarrier being adjusted into P doubly.Afterwards, when receiver 200 receives the corresponding cell of reception Dr by radio channel 300 after, promptly handle and received cell Dr with the inter-carrier interference elimination method of present embodiment.

In the inter-carrier interference elimination method in first embodiment, as long as transmit cell has repeating data, then use the inter-carrier interference elimination method of the embodiment of the invention, subtract each other and multiplication mutually, can eliminate and receive the suffered inter-carrier interference of cell as long as carry out simple ordered series of numbers.

Second embodiment

In a second embodiment, transmit cell Dt comprise cyclic-prefix data (Cyclic prefix, CP) with a data cell (Data symbol).Now explanation utilizes the cyclic-prefix data repeat property of transmit cell Dt, the operation of receiver 200 and conveyer 100.Fig. 9 shows the inter-carrier interference elimination method flow chart of second embodiment.

Please refer to Fig. 9, at first, in step 910, data simultaneous module 210 receives the transmit cell Dt that is produced by conveyer 100 by radio channel 300 in a cell time, received cell Dr.Wherein, transmit cell Dt comprises an initial data cell Dn and a cyclic-prefix data CP.These cyclic-prefix data CP is identical with the back segment data Db of initial data cell Dn.That is after this segment data and cyclic-prefix data visualization are among Fig. 2, two identical initial protion data Dprt.

In receiving cell Dr, comprise that a corresponding data accepted cell and has received cyclic-prefix data CP ', respectively corresponding data cell Dn and cyclic-prefix data CP.It is corresponding above-mentioned back segment data Dn that one of data accepted cell has received back segment data Dn '.

Then, in the step 920, inter-carrier interference estimating module 220 is subtracted each other according to receiving cyclic-prefix data CP ' and the repetition part that receives back segment data Dn ', and is multiplied by a predetermined constant ordered series of numbers C ', decision estimation inter-carrier interference Dici.

Afterwards, in the step 930, inter-carrier interference removal module 230 will receive cell and deduct this estimation inter-carrier interference, obtain an output cell.

Because the leading portion of the data of the reception cyclic-prefix CP ' in transmit cell part may be subjected to the influence that the multi-path transmission of a cell postpones.Therefore, in a second embodiment, inter-carrier interference estimating module 220 is not to be subjected to data of reception cyclic-prefix that a last cell influences and to have received the corresponding part of back segment data and estimate inter-carrier interference.

In the present embodiment, data accepted cell Dn ' comprises N time domain sampled data, has received cyclic-prefix data CP ' and has comprised G time domain sampled data, and the length of assumed wireless passage is L sampling unit, and N 〉=G〉L.Therefore, received among the cyclic-prefix data CP ', preceding L time domain sampling can be subjected to the interference of a cell, and back G-L time domain sampling data is not subjected to the interference of a cell.

Before step 910, the inter-carrier interference estimating and measuring method of present embodiment also comprises step 915 (not shown).In step 915, inter-carrier interference estimating module 220 is taken out back G-L the time domain sampling that has received cyclic-prefix data CP ', obtains some and has received cyclic-prefix data CP ".Inter-carrier interference estimating module 220 and back G-L the time domain sampled data of taking out data accepted cell Dn ' obtain some and have received back segment data Db ".On the mathematical notation, CP " and Db " can multiply by a window matrix W by segment data Db ' after receiving cyclic-prefix data CP ' and receiving respectively _pObtain, wherein,

W _p=[O _{(G-L) * L}I _{(G-L) * (G-L)}] the 30th formula

Afterwards, in step 920, inter-carrier interference estimating module 220 has received cyclic-prefix data CP according to part " received back segment data Db with part " difference of subtracting each other and the product of constant ordered series of numbers, obtain estimating inter-carrier interference

Wherein,

${\stackrel{\&RightArrow;}{e}}_{\mathrm{ici}}^{\mathrm{cp}}\&ap;\frac{(N-1)}{N}\&times;M\&times;\left[\begin{array}{c}{0}_{(N-G+L)\&times;1}\\ \stackrel{\&RightArrow;}{y}(N-1-G+L:N-1)-{\stackrel{\&RightArrow;}{y}}_p(L:G-1)\end{array}\right]$ The 31st formula

In the 29th formula,

For part has received cyclic-prefix data CP ", promptly the L of CP ' is individual to G-1 the formed vector of time domain sampling data.

Be the data accepted cell. $\stackrel{\&RightArrow;}{y}(N-1-G+L:N-1)$ Be that part has received back segment data Db " the time domain formed vector of taking a sample.

Figure 10 shows among second embodiment, one of variation diagram of radio channel response example in a cell time.With reference to the derive estimation inter-carrier interference of the 29th formula of Figure 10.Among Figure 10, H _P1Be receiving unit cyclic-prefix data CP " disturb between suffered mean carrier; H _P2Be segment data Db behind the receiving unit " disturb between suffered mean carrier.

By the 10th formula as can be known,

${\stackrel{\&RightArrow;}{e}}_{\mathrm{ici}}\&ap;M\&times;A\&times;\stackrel{\&RightArrow;}{x}={\mathrm{<figure-callout\; id="1"\; label="M\; p"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">M</figure-callout>}}_p\&times;A\&times;\stackrel{\&RightArrow;}{x}+{\mathrm{<figure-callout\; id="2"\; label="M\; p"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">M</figure-callout>}}_p\&times;A\&times;\stackrel{\&RightArrow;}{x}$ The 32nd formula

${\mathrm{<figure-callout\; id="1"\; label="M\; p"\; filenames="A200810093195E00441.png,A200810093195E00442.png"\; state="\{\{state\}\}">M</figure-callout>}}_p=\left\{\begin{array}{cc}M(i,j)& i=j,0\&le;i,j\&le;N-G+L-1\\ 0& \mathrm{else}\end{array}\right.$ The 33rd formula

${\mathrm{<figure-callout\; id="2"\; label="M\; p"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">M</figure-callout>}}_p=\left\{\begin{array}{cc}M(i,j)& i=j,N-G+L-1\&le;i,j\&le;N-1\\ 0& \mathrm{else}\end{array}\right.$ The 34th formula

${\stackrel{\&RightArrow;}{e}}_{\mathrm{ici}}^{\mathrm{cp}}={\mathrm{<figure-callout\; id="2"\; label="M\; p"\; filenames="A200810093195E00452.png,A200810093195E00481.png"\; state="\{\{state\}\}">M</figure-callout>}}_p\&times;A\&times;\stackrel{\&RightArrow;}{x}$ The 35th formula

In the 30th formula, inter-carrier interference

Can be divided into two parts.Wherein, Be that counterpart has received cyclic-prefix data CP " received back segment data Db with part " inter-carrier interference, i.e. the part eliminated of the inter-carrier interference elimination method of present embodiment institute desire.

It then is corresponding its remaining inter-carrier interference that has received among the cell Dr.

Similar the 15th formula and the 16th formula, part has received the cyclic-prefix data

With part data accepted cell $\stackrel{\&RightArrow;}{y}(N-1-G+L:N-1)$ Can be approximated to be

${\stackrel{\&RightArrow;}{y}}_p(L:G-1)\&ap;W_p\&times;H_{p1}{\stackrel{\&RightArrow;}{x}}_p+W_p\&times;M_p\&times;A\&times;{\stackrel{\&RightArrow;}{x}}_p+W_p\&times;{\stackrel{\&RightArrow;}{n}}_p$

The 36th formula

${\stackrel{\&RightArrow;}{y}}_p(N-1-G+L:N-1)\&ap;W_p\&times;H_{p2}{\stackrel{\&RightArrow;}{x}}_p+W_p\&times;M_p\&times;A\&times;{\stackrel{\&RightArrow;}{x}}_p+W_p\&times;\stackrel{\&RightArrow;}{n}(N-1-G+L:N-1)$

The 37th formula

Wherein,

Back segment data in the transmit cell also equals the cyclic-prefix data.M _pFor similar the 17th, 18 formulas represented with $\stackrel{\&RightArrow;}{y}(N-1-G+L:N-1)$ Mid point make linear approximation when initial point, launch last G-L row of gained diagonal matrix.

For receiving the suffered Gaussian noise of cyclic-prefix data,

Be the suffered Gaussian noise of cell of data.

So, in step 122, inter-carrier interference estimating module 220 will partly receive the back segment data and partly receive the cyclic-prefix data subtracts each other, and can obtain:

$\stackrel{\&RightArrow;}{y}(N-1-G+L:N-1)-{\stackrel{\&RightArrow;}{y}}_p(L:G-1)$

$=W_p\&times;(H_{p2}-H_{p1}){\stackrel{\&RightArrow;}{x}}_p+W_p\&times;{\stackrel{\&RightArrow;}{n}}_p+W_p\&times;\stackrel{\&RightArrow;}{n}(N-1-G+L:N-1)$ The 38th formula

So, similar the 12nd formula, in step 920, inter-carrier interference estimating module 220 will part receive back segment data and part and receive poor that the cyclic-prefix data subtract each other

$\stackrel{\&RightArrow;}{y}(N-1-G+L:N-1)-{\stackrel{\&RightArrow;}{y}}_p(L:G-1)$ Multiply by a default constant ordered series of numbers again, promptly obtain estimating inter-carrier interference

Therefore, utilize the inter-carrier interference elimination method of present embodiment, can estimate and repeat inter-carrier interference partly with the cyclic-prefix data.Therefore, change the cyclic-prefix length in the cell, can determine to remove how many inter-carrier interference.

In addition, because cell time T _sCentral point near passage mean value, so the inter-carrier interference of its time domain is less, during past more cell two ends, its time domain inter-carrier interference is big more.When therefore utilizing cyclic-prefix data CP to do the inter-carrier interference elimination, the cell time of receiving terminal can be shifted to an earlier date Point, the part that allows cyclic-prefix data CP and general data cell repeat is positioned at the cell two ends, can obtain preferable inter-carrier interference and eliminate effect.

Because the gait of march of inter-carrier interference and receiver 200, the channel status of radio channel 300 are relevant.When the gait of march of receiver 200 was accelerated, inter-carrier interference also can increase.Therefore, the conveyer 100 of present embodiment can come the length of design cycle advance data according to the Gaussian noise intensity of gait of march, channel status and receiver, and suitable removes inter-carrier interference.

Conveyer in the wireless transmitting system of the embodiment of the invention can be used a cyclic-prefix data length collocation method, and the length of configuration cycles advance data is more than or equal to 1/2nd of initial data cell length.By in the transmission end configured length being 1/2nd cyclic-prefix data more than or equal to the initial data cell length, receiving terminal can effectively be removed most inter-carrier interference.The length of cyclic-prefix data for example is 1/2nd, 3/4ths or times of initial data cell length.For example, when FFT length was at 8192, the length of cyclic-prefix data can be 4096 points, or 8192 points at 6144; When FFT length was at 4096, the length of cyclic-prefix data can be 2048 points, or 4096 points at 3072; When FFT length was at 2048, the length of cyclic-prefix data can be 1024 points, or 2048 points at 1536; When FFT length was at 1024, the length of cyclic-prefix data can be 512 points, or 1024 points at 768; When FFT length was at 512, the length of cyclic-prefix data can be 256 points, or 512 points at 384; When FFT length was at 256, the length of cyclic-prefix data can be 128 points, or 256 points at 192; When FFT length was at 128, the length of cyclic-prefix data can be 64 points, or 128 points at 96; When FFT length was at 64, the length of cyclic-prefix data can be 32 points, or 64 points at 48.

Illustrate in the present embodiment, produce the operation of the conveyer 100 of transmit cell.Figure 11 shows the calcspar of the conveyer 100 of second embodiment.In the present embodiment, conveyer 100 comprises modulator 110 ', IFFT 120 ' and a cyclic-prefix generator 130 '.Please refer to Figure 11, modulator 110 ' modulation frequency data Df ' obtains through modulation frequency cell Dm '.IFFT 120 ' obtains cell of data Dn to carrying out anti-fast fourier transform through modulation frequency frequency cell Dm '.

Cyclic-prefix generator 130 ' receives cell of data Dn, according to the gait of march of receiver 200, the state of radio channel 300 and the Gaussian noise intensity of receiver, produces suitable cyclic-prefix data.Transmit cell Dt promptly comprises cyclic-prefix data CP and cell of data Dn.

Wherein, cyclic-prefix generator 130 ' is according to the noise intensity of the gait of march of receiver 200, radio channel 300 and the one at least of channel status information, decides the length of cyclic-prefix data CP.Among Figure 11, cyclic-prefix generator 130 ' is the length that decides cyclic-prefix data CP according to the gait of march Sp of receiver 200.In the present embodiment, when the gait of march Sp of receiver 200 is higher than a threshold value, then cyclic-prefix generator 130 ' produces the cyclic-prefix data with one first length.When the gait of march Sp of receiver 200 is not higher than this threshold value, then cyclic-prefix generator 130 ' produces the cyclic-prefix data with one second length.Wherein, first length is long than second length.

From the above, very fast when the gait of march of receiver, make that conveyer can produce long cyclic-prefix data CP when the suffered inter-carrier interference of transmit cell was serious.So, receiver can be removed more inter-carrier interference.Slower when the gait of march of receiver, make the suffered inter-carrier interference of transmit cell more after a little while, conveyer can produce short cyclic-prefix data.So, can increase the efficiency of transmission of transmit cell.Therefore, use the inter-carrier interference elimination method of present embodiment, can between inter-carrier interference and efficiency of transmission, weigh.

Among first and second embodiment, wireless receiving system 10 can also be designed to a multiple-input and multiple-output (Multi-input multi-output, MIMO) system.In this system, conveyer 100 has many transmission antennas, and receiver 200 also has many reception antennas.This environment also can utilize the inter-carrier interference elimination method of being introduced in first and second embodiment, eliminate respectively at carrying out inter-carrier interference on the every reception antenna.

The effect of the inter-carrier interference elimination method of first and second embodiment is described now.Figure 12 is presented under the different mobile environment, use first embodiment inter-carrier interference elimination method, use interfering energy between traditional inter-carrier interference oneself removing method and the complete residual carrier that is subjected to without inter-carrier interference elimination method.

The longitudinal axis of Figure 12 is represented interfering energy P between the suffered residual carrier of transmit cell _ICISize.The transverse axis of Figure 12 represents that the suffered Doppler of receiver spreads the size of fdTs.The size that Doppler is spread fdTs is the gait of march of corresponding receiver.Illustrate, carrier frequency be 2.5GHz, frequency range be that 11.2MHz, FFT size are under 1024 system conditions, the gait of march that fdTs equals 0.05 pairing receiver is about 235 kilometers/hour; The gait of march that fdTs equals 0.1 pairing receiver is about 470 kilometers/hour.

Among Figure 12, when any inter-carrier interference method of removaling is not used in curve 121 expression, received the relation curve that suffered inter-carrier interference of cell and Doppler are spread.When inter-carrier interference oneself removal methods are used in curve 122 expression, the relation curve that spreads of remaining inter-carrier interference and Doppler.When the inter-carrier interference method of removaling of present embodiments is used in curve 123 expression, the relation curve that spreads of remaining inter-carrier interference and Doppler.

By curve 121 to 123 as can be known, when Doppler diffusion is big more, then the energy of inter-carrier interference is bigger.In Figure 12, when fdTs equals 0.05, use inter-carrier interference oneself removing method can make inter-carrier interference by curve 121-24dB drop to curve 122-41dB.Therefore, use inter-carrier interference oneself removing method can reduce the inter-carrier interference of about 17dB.

When fdTs equals 0.05, use the inter-carrier interference elimination method of present embodiment can make inter-carrier interference by curve 121-24dB drop to curve 123-57dB.Therefore, the inter-carrier interference elimination method of use present embodiment can reduce the inter-carrier interference of about 33dB.Therefore, as shown in Figure 12, when transmit cell has repeating data, use the inter-carrier interference elimination method of present embodiment can reduce inter-carrier interference significantly, and better effect is arranged than traditional intercarrier oneself removing method.

Figure 13 and Figure 14 show respectively when transmit cell has repeating data, have received the real part of the actual suffered inter-carrier interference of cell and the size of imaginary part, with its result via the estimation inter-carrier interference.

The transverse axis of Figure 13 and Figure 14 is represented sampling time point, and its longitudinal axis is represented the real part of inter-carrier interference and the size of imaginary part respectively.Wherein, the curve 131 of Figure 13 and the curve 141 of Figure 14 represents to have received the real part and the imaginary part of the actual suffered inter-carrier interference of cell respectively, and the curve 132 of Figure 13 and the curve 142 of Figure 14 represent that respectively inter-carrier interference elimination method estimates the real part and the imaginary part of the estimation inter-carrier interference that.

Can observe discovery among the figure, curve 131 and 132 almost overlaps, and curve 141 and 142 almost overlaps.Therefore, by Figure 13 and Figure 14 as can be known, when transmit cell had repeating data, the inter-carrier interference elimination method of present embodiment can be estimated exactly and inter-carrier interference.

Figure 15 is presented under different Doppler diffusion and the different Gaussian noise intensity, transmit the advance data (Preamble) of 802.16e the channel estimation Mean Square Error (Mean square error, MSE).The longitudinal axis of Figure 15 is a Mean Square Error, and transverse axis is signal to noise ratio (SNR).Curve 151 to 154 is not for to use inter-carrier interference elimination method and Doppler to spread the relation curve that fdTs is 0,0.05,0.1 and 0.2 pairing signal to noise ratio and channel estimation Mean Square Error.Curve 155 to 158 is for spreading the relation curve that fdTs is 0,0.05,0.1 and 0.2 pairing signal to noise ratio and channel estimation Mean Square Error as the inter-carrier interference elimination method and the Doppler that use present embodiment.

The channel estimation Mean Square Error can be influenced by inter-carrier interference and Gaussian noise intensity respectively.Observe curve 153, when fdTs equals 0.1, do not using under the situation of any inter-carrier interference elimination method, its channel estimation Mean Square Error approximately flat (floor) at-30dB.At this moment, increase signal to noise ratio and also can't allow lower that Mean Square Error falls.Compare following in identical gait of march, observe curve 157, use under the situation of inter-carrier interference elimination method of present embodiment, its channel estimation Mean Square Error can be less than-50dB.Therefore, use the inter-carrier interference elimination method of present embodiment can significantly improve the accuracy rate that its circulation passage is estimated.

Figure 16 shows the repeat property of utilizing the cyclic-prefix data, under the cyclic-prefix data conditions of different length, and an example of the graph of a relation of suffered inter-carrier interference and Doppler's diffusion.Curve 161 when not using inter-carrier interference removal method, the relation curve of Doppler's diffusion and inter-carrier interference.Curve 162 to 165 is under 1/8,1/4,1/2 and 3/4 the situation of initial data cell for the length in the cyclic-prefix data, uses the inter-carrier interference method of removaling gained Doppler to spread and the relation curve of inter-carrier interference.

For instance, by curve 161 as can be known, spread fdTs when equaling 0.05 as Doppler, received cell originally suffered inter-carrier interference be about-24dB.By curve 162 as can be known, when the length of cyclic-prefix data was 1/8, resultant inter-carrier interference was about-26dB.At this moment, the inter-carrier interference elimination method of present embodiment can be eliminated the inter-carrier interference of 2dB.

By curve 165 as can be known, when the length of cyclic-prefix data is 3/4, use the inter-carrier interference elimination method of present embodiment, resulting inter-carrier interference is about-40dB.At this moment, the inter-carrier interference elimination method of present embodiment can be eliminated the inter-carrier interference of 16dB.Observe Figure 16 as can be known, when the length of cyclic-prefix data is long more, eliminable inter-carrier interference is many more.

Among above-mentioned two embodiment, be to be example to be applied to the OFDM mechanics of communication.In practical application, the inter-carrier interference elimination method of the embodiment of the invention can be applicable to have the transmit cell of repeating data characteristic, to eliminate the inter-carrier interference that has received cell.

Inter-carrier interference elimination method in the embodiment of the invention only carries out the phase multiplication of ordered series of numbers and the computing of subtracting each other, and promptly obtains estimating inter-carrier interference.Therefore,, can use the inter-carrier interference elimination method of the embodiment of the invention, eliminate having received the suffered inter-carrier interference of cell as long as transmit cell has repeating data.

Compare traditional " multistage inter-carrier interference reduction method " and need carry out the ten minutes complex calculations and do channel status estimation and eliminate with inter-carrier interference, the inter-carrier interference elimination method of the embodiment of the invention has the effect of easily implementing.In addition, the effect of the more traditional inter-carrier interference of the inter-carrier interference elimination method of embodiment of the invention oneself removing method is better.So use the inter-carrier interference elimination method of the embodiment of the invention, can under the prerequisite of low computational complexity, reach very excellent inter-carrier interference and eliminate effect.

In sum, though the present invention discloses as above with a preferred embodiment, so it is not in order to limit the present invention.Those skilled in the art without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is as the criterion when the content that claim defines that look application.

Claims (80)

1, a kind of inter-carrier interference elimination method, in order to eliminate an inter-carrier interference that has received cell, this method comprises:

In a cell time, receive a transmit cell that is produced by a conveyer by a radio channel, obtain this and received cell, this transmit cell comprises P initial protion data, whenever these initial protion data comprise a plurality of original time domain sampled datas, whenever these initial protion data are identical, this has received cell and has comprised P receiving unit data, respectively corresponding those initial protion data;

On time domain, duplicate this P the receiving unit data at least its two, obtain at least two and duplicate partial data, whenever this duplicates P the copy that partial data comprises its pairing data of receiving unit, P is the positive integer greater than 1;

At least two duplicate the difference that part information subtracts each other and the product of a constant ordered series of numbers according to this, determine an estimation inter-carrier interference; And

This is received cell deducted this estimation inter-carrier interference, obtained an output cell.

2, inter-carrier interference elimination method as claimed in claim 1, wherein, this has received cell and has comprised that N has received the time domain sampled data, and N is a positive integer, in this copy step, with this received cell multiply by P window matrix at least its two, at least two duplicate partial data to produce this, wherein, the size of an i window matrix is N * N, comprise P unit matrix, whenever the size of this unit matrix is

Whenever the 1st of this unit matrix the row is positioned at the of this i window matrix OK, other element of this i window matrix is 0, and wherein, i is the positive integer that is less than or equal to P.

3, inter-carrier interference elimination method as claimed in claim 2, wherein, the diagonal bits ordered series of numbers that this constant ordered series of numbers is diagonal matrix C, in this diagonal matrix C, i is listed as the capable element of j and is

$C(i,j)=\left\{\begin{array}{cc}\frac{P}{(P-a)\&times;N}(i-\frac{N-1}{2})& i=j\\ 0& \mathrm{else}\end{array}\right.,$ Wherein, i and j are the positive integer that is less than or equal to P, and a is the positive integer less than P.

4, inter-carrier interference elimination method as claimed in claim 1, wherein, this has received cell is advance data.

5, inter-carrier interference elimination method as claimed in claim 1, wherein, this transmit cell comprises N original time domain sampled data, and this has received cell and has comprised that accordingly N has received the time domain sampled data, and the multiple of N right and wrong P comprises before this copy step:

Received the time domain sampled data to this N and carried out interpolative operation, obtained R interpolation time domain sampled data, wherein, N+R is the multiple of P, and this N+R time domain sampled data is divided into this P receiving unit data.

6, inter-carrier interference elimination method as claimed in claim 1, wherein, this transmit cell comprises by N the original time domain sampled data of modulation to N subcarrier, this has received cell and has comprised that accordingly N has received the time domain sampled data, has a frequency offset between the frequency of this N subcarrier and a reference frequency, make the phase place of this N original time domain sampled data have a corresponding phase pushing figure, before this copy step, comprise:

Received the time domain sampled data to this N and carried out frequency shifting, to compensate this phase pushing figure.

7, inter-carrier interference elimination method as claimed in claim 1, wherein, this transmit cell is exported by one of them that has more into many antennas of the conveyer of multiple output system, and this has received cell and has been received by one of them of many antennas of the receiver of this mimo system.

8, inter-carrier interference elimination method as claimed in claim 1, wherein, this inter-carrier interference elimination method is applied to orthogonal frequency division multitask mechanics of communication, and this transmit cell is a cell.

9, a kind of receiver, be used in a cell time to receive by a conveyer and one of produced transmit cell by a radio channel, obtain one and received cell, and eliminate the inter-carrier interference that this has received cell, and this transmit cell comprises P initial protion data, whenever these initial protion data comprise a plurality of original time domain sampled datas, whenever these initial protion data are identical, this has received cell and has comprised a plurality of data of receiving unit, respectively corresponding those initial protion data, and this receiver comprises:

One data simultaneous module is carried out synchronously in order to this has been received cell;

One inter-carrier interference estimating module, be used to duplicate on the time domain this P the receiving unit data at least its two, obtain at least two and duplicate partial data, whenever this duplicates partial data and comprises that whenever this duplicates P copy of the pairing receiving unit of partial data data, and P is the positive integer greater than 1; And, determine an estimation inter-carrier interference in order at least two to duplicate the difference that part information subtracts each other and the product of a constant ordered series of numbers according to this;

One inter-carrier interference is removed module, deducts this estimation inter-carrier interference in order to this has been received cell, obtains an output cell;

One fast Fourier transformer was converted to a frequency domain in order to should export cell; And

One demodulator is used to this output cell of this frequency domain demodulation.

10, receiver as claimed in claim 9, wherein, this has received cell and has comprised that N has received the time domain sampled data, is divided into this P receiving unit data, and N is a positive integer, this inter-carrier interference estimating module with this received cell multiply by P window matrix at least its two, at least two duplicate partial data to produce this, wherein, the size of an i window matrix is N * N, comprise P unit matrix, whenever the size of this unit matrix is

, other element is 0, wherein, i is the positive integer that is less than or equal to P.

11, receiver as claimed in claim 10, wherein, this constant ordered series of numbers is the diagonal bits ordered series of numbers of a pair of angular moment battle array C, in this diagonal matrix C, i is listed as the capable element of j and is $C(i,j)=\left\{\begin{array}{cc}\frac{P\&times;(N-1)}{(P-a)\&times;N}(i-\frac{N-1}{2})/(N-1)& i=j\\ 0& \mathrm{else}\end{array}\right.,$ Wherein, i and j are the positive integer that is less than or equal to P, and a is the positive integer less than P.

12, receiver as claimed in claim 9, wherein, this has received cell is advance data.

13, receiver as claimed in claim 9, wherein, this transmit cell comprises N original time domain sampled data, this has received cell and has comprised that accordingly N has received the time domain sampled data, the multiple of N right and wrong P, this inter-carrier interference estimating module have received the time domain sampled data to this N and have carried out interpolative operation, obtain R interpolation time domain sampled data, wherein, N+R is the multiple of P; This inter-carrier interference estimating module is divided into this P receiving unit data with this N+R time domain sampled data.

14, receiver as claimed in claim 9, wherein, this transmit cell comprises by N the original time domain sampled data of modulation to N subcarrier, has a frequency offset between the frequency of this N subcarrier and a reference frequency, make the phase place of this N original time domain sampled data have a corresponding phase pushing figure, this has received cell and has comprised that accordingly N has received the time domain sampled data, this inter-carrier interference estimating module has received the time domain sampled data to this N and has carried out frequency shifting, compensating this phase pushing figure, duplicate this these at least two receiving unit data that receive cell after this inter-carrier interference estimating module through compensation.

15, receiver as claimed in claim 9, wherein, this conveyer and this receiver are the conveyer and the receiver of a mimo system, and one of them of many antennas of this conveyer is this transmit cell of output, and one of them of many antennas of this receiver is to receive this to have received cell.

16, receiver as claimed in claim 9, wherein, this receiver is applied to mechanics of communication, and this transmit cell is the OFDM cell.

17, a kind of wireless transmitting system comprises:

One conveyer, in order to produce and to transmit a transmit cell of time domain, this transmit cell comprises P initial protion data, and whenever these initial protion data comprise a plurality of original time domain sampled datas, and whenever this primary reception partial data is identical; And

One receiver receives this transmit cell by a radio channel in a cell time, obtain one and received cell, and this has received cell and has comprised receiving unit data of P, respectively to should P initial protion data, comprising:

One data simultaneous module is carried out synchronously in order to this has been received cell;

One inter-carrier interference estimating module, be used to duplicate on the time domain this P the receiving unit data at least its two, obtain at least two and duplicate partial data, whenever this duplicates P the copy that partial data comprises its pairing data of receiving unit, and P is the positive integer greater than 1; And, determine an estimation inter-carrier interference in order at least two to duplicate the difference that part information subtracts each other and the product of a constant ordered series of numbers according to this;

One inter-carrier interference is removed module, deducts this estimation inter-carrier interference in order to this has been received cell, obtains an output cell;

One fast Fourier transformer was converted to a frequency domain in order to should export cell; And

One demodulator is used to this output cell of this frequency domain demodulation.

18, wireless transmitting system as claimed in claim 17, wherein, this transmit cell comprises N original time domain sampled data, this has received cell and has comprised that accordingly N has received the time domain sampled data, and the multiple of N right and wrong P, then this inter-carrier interference estimating module has received the time domain sampled data to this N and has carried out interpolative operation, obtains R interpolation time domain sampled data, wherein, N+R is the multiple of P; This inter-carrier interference estimating module is divided into this N+R time domain sampled data this P receiving unit data afterwards.

19, wireless transmitting system as claimed in claim 17, wherein, this conveyer with a frequency data modulation to N subcarrier, to obtain this transmit cell, this transmit cell comprises N original time domain sampled data, have a frequency offset between the frequency of this N subcarrier and a reference frequency, make the phase place of this N original time domain sampled data have a corresponding phase pushing figure; This has received cell and has comprised that accordingly N has received the time domain sampled data; This inter-carrier interference estimating module has received the time domain sampled data to this N and has carried out frequency shifting, to compensate this phase pushing figure, duplicates this these at least two receiving unit data that receive cell through compensation after this inter-carrier interference estimating module.

20, wireless transmitting system as claimed in claim 17, wherein, this conveyer comprises:

One modulator in order to in the default frequency range of a frequency data modulation to, obtains

Individual frequency sample data;

One subcarrier adjusting module was in order to should Individual frequency sample data break P point is put N subcarrier to this default frequency range, and puts the sky data to those subcarriers of not putting any frequency sample data, obtains one group through the data of adjusting frequency; And

One anti-fast Fourier transformer is carried out anti-fast fourier transform to this through the data of adjusting frequency, and obtains this transmit cell.

21, wireless receiving system as claimed in claim 17, wherein, this wireless receiving system is a mimo system, this conveyer has a plurality of transmission antennas, those transmit one of antenna and transmit this transmit cell, this receiver has a plurality of reception antennas, and one of those reception antennas receive this and received cell.

22, wireless receiving system as claimed in claim 17, wherein, this wireless receiving system is applied to mechanics of communication, and this transmit cell is the OFDM cell.

23, a kind of inter-carrier interference elimination method, in order to eliminate an inter-carrier interference that has received cell, this method comprises:

In a cell time, receive a transmit cell that is produced by a conveyer by a radio channel, obtain one and received cell, comprise an initial data cell and a cyclic-prefix data, these cyclic-prefix data are identical with the back segment data of this initial data cell, this has received cell and has comprised that accordingly a data accepted cell and has received the cyclic-prefix data, to should initial data cell and this cyclic-prefix data, one of this data accepted cell receives corresponding this back segment data of back segment data respectively;

Receive the difference and the product of a constant ordered series of numbers of subtracting each other to small part of back segment data according to what this had received the cyclic-prefix data to small part and this, determined one to estimate inter-carrier interference; And

This is received cell deducted this estimation inter-carrier interference, obtained an output cell.

24, inter-carrier interference elimination method as claimed in claim 23, wherein, the passage length of this radio channel is a L sampling unit, this has received the cyclic-prefix data and has comprised G time domain sampling data, wherein, before the step of this estimation, this inter-carrier interference elimination method comprises:

Take out this and received cyclic-prefix data G-L time domain sampled data afterwards, obtain some and received the cyclic-prefix data, and take out this data accepted cell G-L time domain sampled data afterwards, obtain some and received the back segment data;

Wherein, in the step of this estimation, receive cyclic-prefix data and this part according to this part and received the difference that the back segment data subtracts each other and the product of a constant ordered series of numbers, determined this estimation inter-carrier interference.

25, inter-carrier interference elimination method as claimed in claim 24 wherein, after taking out these part cyclic-prefix data and this part in the step of segment data, has received cyclic-prefix data and this with this and has received afterwards that segment data multiply by a window matrix W _p, obtain these part cyclic-prefix data and this part back segment data respectively, wherein,

W _p＝[O _(G-L)×L?I _(G-L)×(G-L)]。

26, inter-carrier interference elimination method as claimed in claim 25, wherein, this data accepted cell comprises N time domain sampled data, the diagonal bits ordered series of numbers that this constant ordered series of numbers is diagonal matrix C, in this C matrix, i is listed as the capable element of j and is

$C(i,j)=\left\{\begin{array}{cc}(i-\frac{N-1}{2})/(N-1),& i=j\\ 0,& \mathrm{else}\end{array}\right..$

27, inter-carrier interference elimination method as claimed in claim 23, wherein, this inter-carrier interference is eliminated and is applied to mechanics of communication, and this transmit cell is the OFDM cell.

28, inter-carrier interference elimination method as claimed in claim 23, wherein, the length of these cyclic-prefix data is more than or equal to 1/2nd of this initial data cell length.

29, a kind of wireless transmitting system comprises:

One conveyer in order to produce and to transmit a transmit cell of time domain, comprises an initial data cell and a cyclic-prefix data, and these cyclic-prefix data are identical with an original back segment data of this initial data cell; And

One receiver, in a cell time, receive this transmit cell by a radio channel, obtain one and received cell, this has received cell and has comprised that accordingly a data accepted cell and has received the cyclic-prefix data, respectively to should initial data cell and this cyclic-prefix data, one of this data accepted cell receives corresponding this back segment data of back segment data, and this receiver comprises:

One data simultaneous module is carried out synchronously in order to this has been received cell;

One inter-carrier interference estimating module has received the difference that the back segment section data subtracts each other and the product of a constant ordered series of numbers in order to part and this that has received the cyclic-prefix data according to this, determines an estimation inter-carrier interference;

One inter-carrier interference is removed module, deducts this estimation inter-carrier interference in order to this has been received cell, obtains an output cell;

One fast Fourier transformer was converted to a frequency domain in order to should export cell; And

One demodulator is used to this output cell of this frequency domain demodulation.

30, wireless transmitting system as claimed in claim 29, wherein, this conveyer comprises:

One modulator is in order to modulation one frequency data;

One anti-fast Fourier transformer is converted to this initial data cell on the time domain in order to will be somebody's turn to do through the modulation frequency data; And

One cyclic-prefix generator, in order to producing and this original these identical cyclic-prefix data of segment data afterwards, and decide the length of these cyclic-prefix data according to the one at least of the noise intensity of the gait of march of this receiver, this radio channel and channel status information.

31, wireless transmitting system as claimed in claim 30, wherein, if the gait of march of this receiver is higher than a threshold value, then this cyclic-prefix generator produces the cyclic-prefix data with one first length, if the gait of march of this receiver is not higher than this threshold value, then this cyclic-prefix generator produces the cyclic-prefix data with one second length, and wherein this first length is long than this second length.

32, wireless transmitting system as claimed in claim 29, wherein, the length of these cyclic-prefix data is more than or equal to 1/2nd of the length of this initial data cell.

33, wireless transmitting system as claimed in claim 29, wherein, this wireless transmitting system is applied to mechanics of communication, and this transmit cell is the OFDM cell.

34, a kind of inter-carrier interference elimination method comprises:

In a cell time, receive a transmit cell that is produced by a conveyer by a radio channel, obtain this and received cell, this transmit cell comprises at least two identical initial protion data, this has received the data of receiving unit that cell comprises at least two correspondences, respectively to should at least two initial protion data;

According to this at least two the receiving unit data difference of subtracting each other and the product of a constant ordered series of numbers, determine an estimation inter-carrier interference; And

This is received cell deducted this estimation inter-carrier interference, obtained an output cell.

35, inter-carrier interference elimination method as claimed in claim 34, wherein, this transmit cell comprises P initial protion data, whenever these initial protion data are identical, this has received cell and has comprised P receiving unit data, respectively corresponding those initial protion data, before the step of this estimation, this inter-carrier interference elimination method comprises:

On time domain, duplicate this P the receiving unit data at least its two, obtain this and at least two duplicate partial data, whenever this duplicates P the copy that partial data comprises its pairing data of receiving unit, P is the positive integer greater than 1;

Wherein, in the step of this estimation, at least two duplicate the difference that part information subtracts each other and the product of this constant ordered series of numbers, determine this estimation inter-carrier interference according to this.

36, inter-carrier interference elimination method as claimed in claim 35, wherein, this has received cell and has comprised that N has received the time domain sampled data, and N is a positive integer, in this copy step, with this received cell multiply by P window matrix at least its two, at least two duplicate partial data to produce this, wherein, the size of an i window matrix is N * N, comprise P unit matrix, whenever the size of this unit matrix is

Other element (Entry) is 0, and wherein, i is the positive integer that is less than or equal to P.

37, inter-carrier interference elimination method as claimed in claim 35, wherein, the size of this constant ordered series of numbers is N * N, and wherein, this constant ordered series of numbers is the diagonal bits ordered series of numbers of a pair of angular moment battle array C, and in this diagonal matrix C, i is listed as the capable element of j and is

$C(i,j)=\left\{\begin{array}{cc}\frac{P\&times;(N-1)}{(P-a)\&times;N}(i-\frac{N-1}{2})/(N-1)& i=j\\ 0& \mathrm{else}\end{array}\right.,$ Wherein, i and j are the positive integer that is less than or equal to P, and a is the positive integer less than P.

38, inter-carrier interference elimination method as claimed in claim 35, wherein, this has received cell is advance data.

39, inter-carrier interference elimination method as claimed in claim 34, wherein, this transmit cell comprises an initial data cell and a cyclic-prefix data, these cyclic-prefix data are identical with an original back segment data of this initial data cell, these two initial protions data are these cyclic-prefix data and this original back segment data, this has received cell and has comprised that accordingly a data accepted cell and has received the cyclic-prefix data, respectively to should initial data cell and this cyclic-prefix data, one of this data accepted cell has received corresponding this back segment data of back segment data, and this has received cyclic-prefix data and this, and to have received afterwards segment data be these two receiving unit data;

Wherein, in the step of this estimation, receive cyclic-prefix data and this according to this and received the difference of subtracting each other to small part of back segment data and the product of this constant ordered series of numbers, determined this estimation inter-carrier interference.

40, inter-carrier interference elimination method as claimed in claim 39, wherein, the passage length of this radio channel is a L sampling unit, this has received the cyclic-prefix data and has comprised G time domain sampling data, wherein, before the step of this estimation, this inter-carrier interference elimination method comprises:

Take out back G-L the time domain sampled data that this has received the cyclic-prefix data, obtain some and received the cyclic-prefix data, and take out back G-L time domain sampled data of this data accepted cell, obtain some and received the back segment data;

Wherein, in the step of this estimation, receive cyclic-prefix data and this part according to this part and received the difference of back segment data and the product of a constant ordered series of numbers, determined this estimation inter-carrier interference.

41, inter-carrier interference elimination method as claimed in claim 40 wherein, after this takes out these part cyclic-prefix data and this part in the step of segment data, has received cyclic-prefix data and this with this and has received and multiply by a window matrix W _p, obtain these part cyclic-prefix data and this part back segment data respectively, wherein,

W _p＝[O _(G-L)×L?I _(G-L)×(G-L)]。

42, inter-carrier interference elimination method as claimed in claim 41, wherein, this data accepted cell comprises N time domain sampled data, and this constant ordered series of numbers is the diagonal bits ordered series of numbers of a pair of angular moment battle array C, and in this diagonal matrix C, i is listed as the capable element of j and is

$C(i,j)=\left\{\begin{array}{cc}(i-\frac{N-1}{2})/(N-1),& i=j\\ 0,& \mathrm{else}\end{array}\right..$

43, inter-carrier interference elimination method as claimed in claim 39, wherein, the length of these cyclic-prefix data is more than or equal to 1/2nd of this initial data cell length.

44, inter-carrier interference elimination method as claimed in claim 34, wherein, this inter-carrier interference elimination method is applied to mechanics of communication, and this transmit cell is the OFDM cell.

45, a kind of cyclic-prefix data length collocation method is applicable to a communication system, and wherein this communication system comprises at least one transmit cell, and this transmit cell comprises cyclic-prefix data and a cell of data, and this method comprises:

The length that disposes these cyclic-prefix data is more than or equal to 1/2nd of this cell of data length.

46, cyclic-prefix data length collocation method as claimed in claim 45, wherein, this method is applicable to an inter-carrier interference elimination method.

47, cyclic-prefix data length collocation method as claimed in claim 45, wherein, this communication system is an OFDM communication system.

48, cyclic-prefix data length collocation method as claimed in claim 45, wherein, the length that disposes these cyclic-prefix data for 3/1/2nd, four and one times of this cell of data length one of them.

49, cyclic-prefix data length collocation method as claimed in claim 48, wherein, this cell of data is 8192 points, the length that disposes these cyclic-prefix data be 4096 points, 6144 and 8192 one of them.

50, cyclic-prefix data length collocation method as claimed in claim 48, wherein, this cell of data is 4096 points, the length that disposes these cyclic-prefix data be 2048 points, 3072 and 4096 one of them.

51, cyclic-prefix data length collocation method as claimed in claim 48, wherein, this cell of data is 2048 points, the length that disposes these cyclic-prefix data be 1024 points, 1536 and 2048 one of them.

52, cyclic-prefix data length collocation method as claimed in claim 48, wherein, this cell of data is 1024 points, the length that disposes these cyclic-prefix data be 512 points, 768 and 1024 one of them.

53, cyclic-prefix data length collocation method as claimed in claim 48, wherein, this cell of data is 512 points, the length that disposes these cyclic-prefix data be 256 points, 384 and 512 one of them.

54, cyclic-prefix data length collocation method as claimed in claim 48, wherein, this cell of data is 256 points, the length that disposes these cyclic-prefix data be 128 points, 192 and 256 one of them.

55, cyclic-prefix data length collocation method as claimed in claim 48, wherein, this cell of data is 128 points, the length that disposes these cyclic-prefix data be 64 points, 96 and 128 one of them.

56, cyclic-prefix data length collocation method as claimed in claim 48, wherein, this cell of data is 64 points, the length that disposes these cyclic-prefix data be 32 points, 48 and 64 one of them.

57, a kind of conveyer, be applicable to a communication system, in order to produce and to transmit a transmit cell of time domain, this transmit cell comprises an initial data cell and a cyclic-prefix data, these cyclic-prefix data are identical with an original back segment data of this initial data cell, wherein, the length of these cyclic-prefix data is more than or equal to 1/2nd of this initial data cell length.

58, conveyer as claimed in claim 57, wherein, this conveyer is applicable to an inter-carrier interference elimination method.

59, conveyer as claimed in claim 57, wherein, this communication system is an OFDM communication system.

60, conveyer as claimed in claim 57, wherein, the length of these cyclic-prefix data be 1/2nd, 3/4ths and one times of this initial data cell length one of them.

61, conveyer as claimed in claim 60, wherein, this initial data cell is 8192 points, the length that disposes these cyclic-prefix data be 4096 points, 6144 and 8192 one of them.

62, conveyer as claimed in claim 60, wherein, this initial data cell is 4096 points, the length that disposes these cyclic-prefix data be 2048 points, 3072 and 4096 one of them.

63, conveyer as claimed in claim 60, wherein, this initial data cell is 2048 points, the length that disposes these cyclic-prefix data be 1024 points, 1536 and 2048 one of them.

64, conveyer as claimed in claim 60, wherein, this initial data cell is 1024 points, the length that disposes these cyclic-prefix data be 512 points, 768 and 1024 one of them.

65, conveyer as claimed in claim 60, wherein, this initial data cell is 512 points, the length that disposes these cyclic-prefix data be 256 points, 384 and 512 one of them.

66, conveyer as claimed in claim 60, wherein, this initial data cell is 256 points, the length that disposes these cyclic-prefix data be 128 points, 192 and 256 one of them.

67, conveyer as claimed in claim 60, wherein, this initial data cell is 128 points, the length that disposes these cyclic-prefix data be 64 points, 96 and 128 one of them.

68, conveyer as claimed in claim 60, wherein, this initial data cell is 64 points, the length that disposes these cyclic-prefix data be 32 points, 48 and 64 one of them.

69, a kind of wireless transmitting system comprises:

One conveyer, in order to produce and to transmit a transmit cell of time domain, comprise an initial data cell and a cyclic-prefix data, these cyclic-prefix data are identical with an original back segment data of this initial data cell, wherein, the length of these cyclic-prefix data is more than or equal to 1/2nd of this initial data cell length; And

One receiver, in a cell time, receive this transmit cell by a radio channel, obtain one and received cell, this has received cell and has comprised that accordingly a data accepted cell and has received the cyclic-prefix data, respectively to should initial data cell and this cyclic-prefix data, one of this data accepted cell have received back segment data system to should original back segment data.

70, as the described wireless transmitting system of claim 69, wherein, this system is applicable to an inter-carrier interference elimination method.

71, as the described wireless transmitting system of claim 69, wherein, this system is an OFDM communication system.

72, as the described wireless transmitting system of claim 69, wherein, the length of these cyclic-prefix data be 1/2nd, 3/4ths and one times of this initial data cell length one of them.

73, as the described wireless transmitting system of claim 72, wherein, this initial data cell is 8192 points, the length that disposes these cyclic-prefix data be 4096 points, 6144 and 8192 one of them.

74, as the described wireless transmitting system of claim 72, wherein, this initial data cell is 4096 points, the length that disposes these cyclic-prefix data be 2048 points, 3072 and 4096 one of them.

75, as the described wireless transmitting system of claim 72, wherein, this initial data cell is 2048 points, the length that disposes these cyclic-prefix data be 1024 points, 1536 and 2048 one of them.

76, as the described wireless transmitting system of claim 72, wherein, this initial data cell is 1024 points, the length that disposes these cyclic-prefix data be 512 points, 768 and 1024 one of them.

77, as the described wireless transmitting system of claim 72, wherein, this initial data cell is 512 points, the length that disposes these cyclic-prefix data be 256 points, 384 and 512 one of them.

78, as the described wireless transmitting system of claim 72, wherein, this initial data cell is 256 points, the length that disposes these cyclic-prefix data be 128 points, 192 and 256 one of them.

79, as the described wireless transmitting system of claim 72, wherein, this initial data cell is 128 points, the length that disposes these cyclic-prefix data be 64 points, 96 and 128 one of them.

80, as the described wireless transmitting system of claim 72, wherein, this initial data cell is 64 points, the length that disposes these cyclic-prefix data be 32 points, 48 and 64 one of them.

Images