CN102882826A - Method and device for computing correlation peak values - Google Patents

Method and device for computing correlation peak values Download PDF

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CN102882826A
CN102882826A CN2012103658023A CN201210365802A CN102882826A CN 102882826 A CN102882826 A CN 102882826A CN 2012103658023 A CN2012103658023 A CN 2012103658023A CN 201210365802 A CN201210365802 A CN 201210365802A CN 102882826 A CN102882826 A CN 102882826A
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correlation
cycle
play amount
sampling clock
correlation peak
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CN102882826B (en
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洪波
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Beijing Haier IC Design Co Ltd
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Beijing Haier IC Design Co Ltd
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Abstract

An embodiment of the invention relates to a method and a device for computing correlation peak values. The method includes determining offset according to sampling clock offset and the length of OFDM (orthogonal frequency division multiplexing) characters, computing first correlation values according to the offset and acquired data, and searching out the first correlation peak value from the first correlation values. Accordingly, by the method in the embodiment, the offset is added into a correlation value computing formula when offset exists in sampling clock frequency, and finally the correlation peak value can be computed.

Description

Correlation peak computational methods and device
Technical field
The present invention relates to the radio digital communication field, relate in particular to a kind of correlation peak computational methods and device.
Background technology
Multicarrier system has the ability of anti-multipath fading and higher frequency efficiency, is widely used in the radio digital communication field.Fig. 1 is multicarrier system model schematic diagram in the prior art; as shown in Figure 1; transmission is during according to data; for data sending terminal; at first; data are carried out inverse Fourier transform (Inverse Fast Fourier Transform; IFFT); secondly, in order to resist multidiameter delay, data are through after the IFFT; often in data, insert protection interval (Guard Interval; GI), Fig. 2 is that protection interval schematic diagram is inserted in OFDM symbol front in the prior art, as shown in Figure 2; with each OFDM (Orthogonal Frequency Division Multiplexing; OFDM) data block is copied to the new OFDM symbol of current OFDM symbol front composition with the Data duplication of afterbody certain-length, and is last, and data communication device is crossed transmission.For data receiver, at first, from the channel receive data, secondly, take out the GI in the data, last, the data that will remove GI restore the primary data that data sending terminal sends through Fourier transform (Fast Fourier Transform, FFT).
Wherein, after data receiver receives data by channel, need to carry out frame synchronization, this is to carry out computing to the data that receive, and thereby the searching correlation peak obtains the frame synchronization starting point from operation result, if it is too high or too low to gather clock frequency, just can't obtains correlation peak, thereby affect follow-up frame synchronization.
Summary of the invention
The objective of the invention is the defective for prior art, a kind of correlation peak computational methods and device are provided, thereby solve the problem that can't calculate correlation peak when there is deviation in the sampling clock frequency.
In first aspect, the embodiment of the invention provides a kind of correlation peak computational methods, and described method comprises:
Length according to sampling clock deviation and OFDM symbol is determined side-play amount;
Calculate the first correlation according to described side-play amount and image data;
From described the first correlation, find out the first correlation peak of described the first correlation.
Preferably, described method also comprises:
Calculate the cycle of described the first correlation peak;
According to the relation in cycle of cycle of described the first correlation peak and orthogonal frequency division multiplex OFDM symbol, regulate the sampling clock frequency;
Sampling clock utilizes the sample frequency image data after the described adjusting;
Utilize the data that gather to calculate the second correlation;
From described the second correlation, find out the second correlation peak.
Preferably, described length according to sampling clock deviation and OFDM symbol determines that side-play amount is specially: the length of described sampling clock deviation and described OFDM symbol is multiplied each other, with multiplied result as described side-play amount.
Preferably, describedly calculate the first correlation according to described side-play amount and image data and be specially: utilize formula according to described side-play amount and image data
Figure BDA00002201281600021
Calculate described the first correlation, wherein, m and n are integer, and Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described the first correlation in the one-period, and 0＜K＜Nd+Ng, M are described side-play amount, Be described the first correlation, x M+n+Nd+KAnd x M+KBe described image data, Be x M+KConjugation, x M+n+Nd+KAnd x M+KBetween differ n+Nd data.
Further preferably, the relation in the cycle of the cycle of described the first correlation peak and orthogonal frequency division multiplex OFDM symbol, regulate the sampling clock frequency and specifically comprise:
When cycle of described the first correlation peak during less than cycle of described OFDM symbol, then reduce described sampling clock frequency;
When cycle of described the first correlation peak during greater than cycle of described OFDM symbol, then reduce described sampling clock frequency.
Further preferably, the data of described utilization collection are calculated the second correlation and are specially: utilize formula according to described side-play amount and image data
Figure BDA00002201281600031
Calculate described the second correlation, wherein, m and n are integer, and Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described the second correlation in the one-period, and 0＜K＜Nd+Ng, M are described side-play amount,
Figure BDA00002201281600032
Be described the second correlation, x M+Nd+KAnd x M+KBe the data of described collection,
Figure BDA00002201281600033
Be x M+KConjugation, x M+Nd+KAnd x M+KBetween differ Nd data.
In second aspect, the embodiment of the invention provides a kind of correlation peak calculation element, and described device comprises:
Determining unit is used for determining side-play amount according to the length of sampling clock deviation and OFDM symbol, and described side-play amount is transferred to the first computing unit;
The first computing unit is used for receiving described side-play amount from determining unit, calculates the first correlation according to described side-play amount and image data, described the first correlation is transferred to first search the unit;
First searches the unit, is used for receiving described the first correlation from the first computing unit, finds out the first correlation peak of described the first correlation from described the first correlation.
Preferably, described device also comprises:
The computation of Period unit is used for searching the unit from first and receives described the first correlation peak, the cycle of calculating described the first correlation peak, with the periodic transfer of described the first correlation peak to regulon;
Regulon, be used for receiving from the computation of Period unit cycle of described the first correlation peak, according to the relation in cycle of cycle of described the first correlation peak and orthogonal frequency division multiplex OFDM symbol, regulate the sampling clock frequency, the sample frequency after regulating is transferred to collecting unit;
Collecting unit is used for receiving sample frequency after the described adjusting from regulon, and sampling clock utilizes the sample frequency image data after the described adjusting, and image data is transferred to the second computing unit;
The second computing unit is used for receiving described image data from collecting unit, utilizes described image data to calculate the second correlation, described the second correlation is transferred to second search the unit;
Second searches the unit, is used for receiving described the second correlation from the second computing unit, finds out the second correlation peak from described the second correlation.
Preferably, described computation of Period unit specifically is used for: the length of described sampling clock deviation and described OFDM symbol is multiplied each other, with multiplied result as described side-play amount.
Preferably, described the first computing unit specifically is used for: utilize formula according to described side-play amount and image data Calculate described the first correlation, wherein, m and n are integer, and Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described the first correlation in the one-period, and 0＜K＜Nd+Ng, M are described side-play amount,
Figure BDA00002201281600042
Be described the first correlation, x M+n+Nd+KAnd x M+KBe described image data,
Figure BDA00002201281600043
Be x M+KConjugation, x M+n+Nd+KAnd x M+KBetween differ n+Nd data.
Further preferably, regulon specifically is used for:
When cycle of described the first correlation peak during less than cycle of described OFDM symbol, then reduce described sampling clock frequency;
When cycle of described the first correlation peak during greater than cycle of described OFDM symbol, then reduce described sampling clock frequency.
Further preferably, described the second computing unit specifically is used for: utilize formula according to described side-play amount and image data
Figure BDA00002201281600044
Calculate described the second correlation, wherein, m and n are integer, and Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described the second correlation in the one-period, and 0＜K＜Nd+Ng, M are described side-play amount,
Figure BDA00002201281600045
Be described the second correlation, x M+Nd+KAnd x M+KBe the data of described collection,
Figure BDA00002201281600046
Be x M+KConjugation, x M+Nd+KAnd x M+KBetween differ Nd data.
In the embodiment of the invention, determine side-play amount according to the length of sampling clock deviation and OFDM symbol, calculate the first correlation according to described side-play amount and image data, and from the first correlation, find out the first correlation peak.Thus, when the embodiment of the invention has realized that there is deviation in the sampling clock frequency, side-play amount is added the correlation value calculation formula, thereby calculate correlation peak.
Description of drawings
Fig. 1 is multicarrier system model schematic diagram in the prior art;
Fig. 2 is that protection interval schematic diagram is inserted in OFDM symbol front in the prior art;
Fig. 3 is OFDM symbol and correlation corresponding relation figure in the prior art;
The correlation peak computational methods flow chart that Fig. 4 embodiment of the invention provides;
The another correlation peak computational methods flow chart that Fig. 5 embodiment of the invention provides;
The correlation peak calculation element schematic diagram that Fig. 6 embodiment of the invention provides;
The another correlation peak calculation element schematic diagram that Fig. 7 embodiment of the invention provides.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Fig. 3 is OFDM symbol and correlation corresponding relation figure in the prior art.As shown in Figure 3, when the sampling clock frequency does not have deviation, utilize formula
Figure BDA00002201281600051
Can calculate correlation, wherein, R KBe correlation, Ng is the length at protection interval, x M+Nd+KAnd x M+KBe the data that gather,
Figure BDA00002201281600052
Be x M+KConjugation, x M+Nd+KAnd x M+KBetween differ Nd data, K is the number of described the second correlation in the one-period, 0＜K＜Nd+Ng.In the correlation curve | R K| be R KMould, wherein, if x M+KNot the protection interval data, the mould of the correlation that then calculates according to above-mentioned formula | R K| less, the horizontal dotted line part in the corresponding diagram in the correlation curve; If x M+KThe protection interval data, because x M+K=x M+K+Nd(m=1,2,3..., Ng), then corresponding correlation R KCan be expressed as: R K = Σ m = 1 Ng x m + Nd + K x m + K ‾ = Σ m = 1 Ng x m + K x m + K ‾ = Σ m = 1 Ng | x m + K | 2 , The mould of correlation then | R K| larger, the dotted line part in the corresponding correlation curve therefrom can be found out, has correlation peak R in the correlation p, correlation peak R pThe position of data is the frame synchronization starting point in the corresponding OFDM symbol, but in the practical application, all there is deviation in the sampling clock frequency, therefore, works as x M+KWhen being the protection interval data, x M+K≠ x M+K+Nd(m=1,2,3..., Ng) correlation peak can not occur in the correlation curve that calculates according to above-mentioned formula, thereby can't continue follow-up frame synchronization.
In the embodiment of the invention, determine side-play amount according to the length of sampling clock deviation and OFDM symbol, calculate the first correlation according to described side-play amount and image data, and from the first correlation, find out the first correlation peak.Thus, when the embodiment of the invention has realized that there is deviation in the sampling clock frequency, side-play amount is added the correlation value calculation formula, thereby calculate correlation peak.
The correlation peak computational methods flow chart that Fig. 4 embodiment of the invention provides.As shown in Figure 4, the method that provides of the embodiment of the invention may further comprise the steps:
Step 401 is determined side-play amount according to the length of sampling clock deviation and OFDM symbol.
When there is deviation in the sampling clock frequency, utilize above-mentioned existing formula can't calculate correlation peak, therefore, need to improve existing formula.
Particularly, can utilize formula
Figure BDA00002201281600062
Calculate described the first correlation, wherein, m and n are integer, and Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described the first correlation in the one-period, 0＜K＜Nd+Ng,
Figure BDA00002201281600063
Be described the first correlation, x M+n+Nd+KAnd x M+KBe described image data,
Figure BDA00002201281600064
Be x M+KConjugation, x M+n+Nd+KAnd x M+KBetween differ n+Nd data, M is described side-play amount, the value of M is decided according to the size of sample clock frequency deviation.
Take digital video broadcast-terrestrial (Digital Video Broadcasting-Terrestrial, DVB-T) 8K pattern as example, its OFDM symbol lengths is 8192.
Suppose that namely the sampling clock frequency was higher when sample clock frequency deviation was 120ppm (ppm be 1,000,000/), then in the one-period, the image data number deviation that causes thus is 8192 * 120 * 1 * 10 -61 of ≈, namely each cycle has gathered 1 data more, therefore, gets M=1, and then the correlation formula is R ‾ K = Σ n = - 1 1 Σ m = 1 Ng x m + n + 8192 + K x m + K ‾ = Σ m = 1 Ng x m - 1 + 8192 + K x m + K ‾ + Σ m = 1 Ng x m + 8192 + K x m + K ‾ + Σ m = 1 Ng x m + 1 + 8192 + K x m + K ‾ , Because each cycle gathered 1 data more, so during n=-1, x i(i=m+K) (m=1,2 ... Ng) be protection during interval data, then x i=x I+8192-1, can find out from above-mentioned formula, wherein Σ m = 1 Ng x m - 1 + 8192 + K x m + K ‾ = Σ m = 1 Ng x m + K x m + K ‾ = Σ m = 1 Ng | x m + K | 2 , Be correlation peak.
Suppose sample clock frequency deviation be-during 120ppm (ppm be 1,000,000/), namely the sampling clock frequency is on the low side, then in the one-period, the image data number deviation that causes thus is-8192 * 120 * 1 * 10 -6≈-1, namely each cycle has gathered 1 data less, therefore, gets M=-1, and then the correlation value calculation formula is R ‾ K = Σ n = 1 - 1 Σ m = 1 Ng x m + n + 8192 + K * x m + K ‾ = Σ m = 1 Ng x m - 1 + 8192 + K * x m + K ‾ + Σ m = 1 Ng x m + 8192 + K * x m + K ‾ + Σ m = 1 Ng x m + 1 + 8192 + K * x m + K ‾ , Because each cycle gathered 1 data less, so during n=1, and x i(i=m+K) (m=1,2 ... Ng) be protection during interval data, then x i=x I+8192+1, can find out from above-mentioned formula, wherein Σ m = 1 Ng x m + 1 + 8192 + K x m + K ‾ = Σ m = 1 Ng x m + K x m + K ‾ = Σ m = 1 Ng | x m + K | 2 , Be correlation peak.
This shows, no matter the sampling clock frequency is higher or on the low side, always can find out the determined value of side-play amount M, carry it into above-mentioned the first correlation computing formula after, can make the correlation curve correlation peak occur.
Step 402 is calculated the first correlation according to described side-play amount and image data.
After determining side-play amount M by above-mentioned steps, can calculate the first correlation.
Step 403 finds out the first correlation peak of described the first correlation from described the first correlation.
In the embodiment of the invention, determine side-play amount according to the length of sampling clock deviation and OFDM symbol, calculate the first correlation according to described side-play amount and image data, and from the first correlation, find out the first correlation peak.Thus, when the embodiment of the invention has realized that there is deviation in the sampling clock frequency, side-play amount is added the correlation value calculation formula, thereby calculate correlation peak.
Preferably, the another correlation peak computational methods flow chart that provides of Fig. 5 embodiment of the invention.As shown in Figure 5, the method for the embodiment of the invention may further comprise the steps:
Elaborate among the step 501-503 step 401-403 in the above-described embodiments, do not give unnecessary details again at this.
Step 504, the cycle of calculating described the first correlation peak.
Particularly, according to the time interval of adjacent two the first correlation peaks, calculate the cycle of the first correlation peak.
Step 505 according to the relation in cycle of cycle of described the first correlation peak and orthogonal frequency division multiplex OFDM symbol, is regulated the sampling clock frequency.
Can find out obviously that from Fig. 3 when not having sample clock frequency deviation, GI and position, OFDM boundary are consistent in the position of each correlation peak and its corresponding OFDM symbol.But, when having sample clock frequency deviation, the first correlation peak that process step 501-503 calculates, its position can inclined to one side 1 in the OFDM symbol GI and position, OFDM boundary, namely the cycle of the cycle of the first correlation peak and OFDM symbol can be inconsistent, therefore, need to regulate.
Particularly, when cycle of described the first correlation peak during less than cycle of described OFDM symbol, then reduce described sampling clock frequency;
When cycle of described the first correlation peak during greater than cycle of described OFDM symbol, then reduce described sampling clock frequency.
Need to prove, need to regulate through one or many, just sampling clock can be adjusted on the suitable frequency.
Need to prove that the value of side-play amount M can not be too large, M is larger, and system is more unstable, and therefore, rule of thumb M generally gets-1 or 1.But those skilled in the art can take the circumstances into consideration to determine according to actual conditions the size of M.
Step 506, sampling clock are utilized the sample frequency image data after the described adjusting.
Step 507 utilizes the data that gather to calculate the second correlation.
Particularly, after the process above-mentioned steps is adjusted to sampling clock on the suitable frequency, at this moment, can adopt the formula of existing calculating correlation to calculate correlation, namely
Figure BDA00002201281600091
Wherein, R KBe the second correlation, Ng is the length at protection interval, x M+Nd+KAnd x M+KBe the data that gather,
Figure BDA00002201281600092
Be x M+KConjugation, x M+Nd+KAnd x M+KBetween differ Nd data, K is the number of described the second correlation in the one-period, 0＜K＜Nd+Ng.For with step 502 in the first correlation make a distinction, the correlation here is called the second correlation.
Step 508 is found out the second correlation peak from described the second correlation.
What above-described embodiment was described is, when there is deviation in the sampling clock frequency, determine side-play amount according to sample clock frequency deviation, calculate the first correlation according to side-play amount, from the first correlation, find out the peak value of the first correlation, and the cycle of calculating the first correlation, according to the cycle of the first correlation and the period-luminosity relation adjusting sampling clock frequency of OFDM symbol, until with till the sampling clock frequency adjustment is when very little on the calculating of correlation peak impact, at this moment adopt again existing correlation value calculation formula just can calculate correlation peak.
Accordingly, the embodiment of the invention provides a kind of correlation peak calculation element, the correlation peak calculation element schematic diagram that Fig. 6 embodiment of the invention provides.As shown in Figure 6, the device that provides of the embodiment of the invention comprises:
Determining unit 601 is used for determining side-play amount according to the length of sampling clock deviation and OFDM symbol, and described side-play amount is transferred to the first computing unit.
The first computing unit 602 is used for receiving described side-play amount from determining unit, calculates the first correlation according to described side-play amount and image data, described the first correlation is transferred to first search the unit.
First searches unit 603, is used for receiving described the first correlation from the first computing unit, finds out the first correlation peak of described the first correlation from described the first correlation.
In the embodiment of the invention, determine side-play amount according to the length of sampling clock deviation and OFDM symbol, calculate the first correlation according to described side-play amount and image data, and from the first correlation, find out the first correlation peak.Thus, when the embodiment of the invention has realized that there is deviation in the sampling clock frequency, side-play amount is added the correlation value calculation formula, thereby calculate correlation peak.
Preferably, the another correlation peak calculation element schematic diagram that provides of Fig. 7 embodiment of the invention.As shown in Figure 7, the device that provides of the embodiment of the invention comprises:
Determining unit 601 in the function that determining unit 701, the first computing unit 702 and first are searched unit 703 and above-described embodiment, the function that the first computing unit 602 and first is searched unit 603 are the same, do not give unnecessary details again at this.
Computation of Period unit 704 is used for searching the unit from first and receives described the first correlation peak, the cycle of calculating described the first correlation peak, with the periodic transfer of described the first correlation peak to regulon.
Regulon 705, be used for receiving from the computation of Period unit cycle of described the first correlation peak, according to the relation in cycle of cycle of described the first correlation peak and orthogonal frequency division multiplex OFDM symbol, regulate the sampling clock frequency, the sample frequency after regulating is transferred to the second computing unit.
Collecting unit 706 is used for receiving sample frequency after the described adjusting from regulon, and sampling clock utilizes the sample frequency image data after the described adjusting, and image data is transferred to the second computing unit.
The second computing unit 707 is used for receiving described image data from collecting unit, utilizes described image data to calculate the second correlation, described the second correlation is transferred to second search the unit.
Second searches unit 708, is used for receiving described the second correlation from the second computing unit, finds out the second correlation peak from described the second correlation.
What above-described embodiment was described is, when there is deviation in the sampling clock frequency, determine side-play amount according to sample clock frequency deviation, calculate the first correlation according to side-play amount, from the first correlation, find out the peak value of the first correlation, and the cycle of calculating the first correlation, according to the cycle of the first correlation and the period-luminosity relation adjusting sampling clock frequency of OFDM symbol, until with till the sampling clock frequency adjustment is when very little on the calculating of correlation peak impact, at this moment adopt again existing correlation value calculation formula just can calculate correlation peak.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; the protection range that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (12)

1. correlation peak computational methods is characterized in that, described method comprises:
Length according to sampling clock deviation and OFDM symbol is determined side-play amount;
Calculate the first correlation according to described side-play amount and image data;
From described the first correlation, find out the first correlation peak of described the first correlation.
2. the method for claim 1 is characterized in that, described method also comprises:
Calculate the cycle of described the first correlation peak;
According to the relation in cycle of cycle of described the first correlation peak and orthogonal frequency division multiplex OFDM symbol, regulate the sampling clock frequency;
Sampling clock utilizes the sample frequency image data after the described adjusting;
Utilize the data that gather to calculate the second correlation;
From described the second correlation, find out the second correlation peak.
3. the method for claim 1 is characterized in that, described length according to sampling clock deviation and OFDM symbol determines that side-play amount is specially: the length of described sampling clock deviation and described OFDM symbol is multiplied each other, with multiplied result as described side-play amount.
4. the method for claim 1 is characterized in that, describedly calculates the first correlation according to described side-play amount and image data and is specially: utilize formula according to described side-play amount and image data Calculate described the first correlation, wherein, m and n are integer, and Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described the first correlation in the one-period, and 0＜K＜Nd+Ng, M are described side-play amount,
Figure FDA00002201281500012
Be described the first correlation, x M+n+Nd+KAnd x M+KBe described image data,
Figure FDA00002201281500013
Be x M+KConjugation, x M+n+Nd+KAnd x M+KBetween differ n+Nd data.
5. method as claimed in claim 2 is characterized in that, described according to described the first correlation peak cycle and the relation in cycle of orthogonal frequency division multiplex OFDM symbol, regulate the sampling clock frequency and specifically comprise:
When cycle of described the first correlation peak during less than cycle of described OFDM symbol, then reduce described sampling clock frequency;
When cycle of described the first correlation peak during greater than cycle of described OFDM symbol, then reduce described sampling clock frequency.
6. method as claimed in claim 2 is characterized in that, the data of described utilization collection are calculated the second correlation and are specially: utilize formula according to described side-play amount and image data Calculate described the second correlation, wherein, m and n are integer, and Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described the second correlation in the one-period, and 0＜K＜Nd+Ng, M are described side-play amount,
Figure FDA00002201281500022
Be described the second correlation, x M+Nd+KAnd x M+KBe the data of described collection, Be x M+KConjugation, x M+Nd+KAnd x M+KBetween differ Nd data.
7. a correlation peak calculation element is characterized in that, described device comprises:
Determining unit is used for determining side-play amount according to the length of sampling clock deviation and OFDM symbol, and described side-play amount is transferred to the first computing unit;
The first computing unit is used for receiving described side-play amount from determining unit, calculates the first correlation according to described side-play amount and image data, described the first correlation is transferred to first search the unit;
First searches the unit, is used for receiving described the first correlation from the first computing unit, finds out the first correlation peak of described the first correlation from described the first correlation.
8. device as claimed in claim 7 is characterized in that, described device also comprises:
The computation of Period unit is used for searching the unit from first and receives described the first correlation peak, the cycle of calculating described the first correlation peak, with the periodic transfer of described the first correlation peak to regulon;
Regulon is used for receiving from the computation of Period unit cycle of described the first correlation peak, according to the relation in cycle with the cycle of OFDM symbol of described the first correlation peak, regulates the sampling clock frequency, and the sample frequency after the adjusting is transferred to collecting unit;
Collecting unit is used for receiving sample frequency after the described adjusting from regulon, and sampling clock utilizes the sample frequency image data after the described adjusting, and image data is transferred to the second computing unit;
The second computing unit is used for receiving described image data from collecting unit, utilizes described image data to calculate the second correlation, described the second correlation is transferred to second search the unit;
Second searches the unit, is used for receiving described the second correlation from the second computing unit, finds out the second correlation peak from described the second correlation.
9. device as claimed in claim 7 is characterized in that, described computation of Period unit specifically is used for: the length of described sampling clock deviation and described OFDM symbol is multiplied each other, with multiplied result as described side-play amount.
10. device as claimed in claim 7 is characterized in that, described the first computing unit specifically is used for: utilize formula according to described side-play amount and image data
Figure FDA00002201281500031
Calculate described the first correlation, wherein, m and n are integer, and Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described the first correlation in the one-period, and 0＜K＜Nd+Ng, M are described side-play amount,
Figure FDA00002201281500032
Be described the first correlation, x M+n+Nd+KAnd x M+KBe described image data,
Figure FDA00002201281500033
Be x M+KConjugation, x M+n+Nd+KAnd x M+KBetween differ n+Nd data.
11. device as claimed in claim 8 is characterized in that, described regulon specifically is used for:
When cycle of described the first correlation peak during less than cycle of described OFDM symbol, then reduce described sampling clock frequency;
When cycle of described the first correlation peak during greater than cycle of described OFDM symbol, then reduce described sampling clock frequency.
12. device as claimed in claim 8 is characterized in that, described the second computing unit specifically is used for: utilize formula according to described side-play amount and image data Calculate described the second correlation, wherein, m and n are integer, and Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described the second correlation in the one-period, and 0＜K＜Nd+Ng, M are described side-play amount,
Figure FDA00002201281500035
Be described the second correlation, x M+Nd+KAnd x M+KBe the data of described collection, Be x M+KConjugation, x M+Nd+KAnd x M+KBetween differ Nd data.
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