CN102882826B - Method and device for computing correlation peak values - Google Patents
Method and device for computing correlation peak values Download PDFInfo
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- CN102882826B CN102882826B CN201210365802.3A CN201210365802A CN102882826B CN 102882826 B CN102882826 B CN 102882826B CN 201210365802 A CN201210365802 A CN 201210365802A CN 102882826 B CN102882826 B CN 102882826B
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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
Technical field
The present invention relates to radio digital communication field, particularly relate to a kind of correlation peak computational methods and device.
Background technology
Multicarrier system has ability to anti-multipath fading and higher frequency efficiency, is widely used in radio digital communication field.Fig. 1 is multicarrier system model schematic in prior art, as shown in Figure 1, when transmission is according to data, for data sending terminal, first, data are carried out inverse Fourier transform (InverseFast Fourier Transform, IFFT), secondly, in order to resist multidiameter delay, data are after IFFT, often insert protection interval (Guard Interval in the data, GI), Fig. 2 inserts protection interval schematic diagram before OFDM symbol in prior art, as shown in Figure 2, by each OFDM (OrthogonalFrequency Division Multiplexing, OFDM) Data duplication of afterbody certain length is copied to before previous OFDM symbol and forms new OFDM symbol by data block, finally, data are passed through transmission.For data receiver, first, from channel received data, secondly, take out the GI in data, finally, the data removing GI are restored through Fourier transform (Fast Fourier Transform, FFT) primary data that data sending terminal sends.
Wherein, after data receiver receives data by channel, need to carry out frame synchronization, this can carry out computing to the data received, and from operation result, find correlation peak thus obtain frame synchronization starting point, if it is too high or too low to gather clock frequency, just cannot obtains correlation peak, thus affect follow-up frame synchronization.
Summary of the invention
The object of the invention is the defect for prior art, a kind of correlation peak computational methods and device are provided, thus solve the problem that cannot calculate correlation peak when sample clock frequency exists deviation.
In first aspect, embodiments provide a kind of correlation peak computational methods, described method comprises:
According to the length determination side-play amount of sampling clock deviation and OFDM symbol;
The first correlation is calculated according to described side-play amount and image data;
The first correlation peak of described first correlation is found out from described first correlation.
Preferably, described method also comprises:
Calculate the cycle of described first correlation peak;
According to the relation in the cycle of described first correlation peak and the cycle of orthogonal frequency division multiplex OFDM symbol, regulate sample clock frequency;
Sampling clock utilizes the sample frequency image data after described adjustment;
The data gathered are utilized to calculate the second correlation;
The second correlation peak is found out from described second correlation.
Preferably, to be describedly specially with the length determination side-play amount of OFDM symbol according to sampling clock deviation: the length of described sampling clock deviation with described OFDM symbol is multiplied, using 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
calculate described first correlation, wherein, m and n is integer; Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described first correlation in one-period; 0 < K < Nd+Ng, M is described side-play amount
for described first correlation, x
m+n+Nd+Kand x
m+Kfor described image data,
for x
m+Kconjugation, x
m+n+Nd+Kand x
m+Kbetween differ n+Nd data.
Further preferably, the relation in the cycle of described first correlation peak and the cycle of orthogonal frequency division multiplex OFDM symbol, regulates sample clock frequency specifically to comprise:
When the cycle of described first correlation peak is less than the cycle of described OFDM symbol, then reduce described sample clock frequency;
When the cycle of described first correlation peak is greater than the cycle of described OFDM symbol, then reduce described sample clock frequency.
Further preferably, the data that described utilization gathers calculate the second correlation and are specially: utilize formula according to described side-play amount and image data
calculate described second correlation, wherein, m and n is integer; Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described second correlation in one-period; 0 < K < Nd+Ng, M is described side-play amount
for described second correlation, x
m+Nd+Kand x
m+Kfor the data of described collection,
for x
m+Kconjugation, x
m+Nd+Kand x
m+Kbetween differ Nd data.
In second aspect, embodiments provide a kind of correlation peak calculation element, described device comprises:
Determining unit, for the length determination side-play amount according to sampling clock deviation and OFDM symbol, transfers to the first computing unit by described side-play amount;
First computing unit, for receiving described side-play amount from determining unit, calculates the first correlation according to described side-play amount and image data, described first correlation is transferred to first and searches unit;
First searches unit, for receiving described first correlation from the first computing unit, finds out the first correlation peak of described first correlation from described first correlation.
Preferably, described device also comprises:
Computation of Period unit, receiving described first correlation peak for searching unit from first, calculating the cycle of described first correlation peak, by the periodic transfer of described first correlation peak to regulon;
Regulon, for receiving the cycle of described first correlation peak from computation of Period unit, according to the relation in the cycle of described first correlation peak and the cycle of orthogonal frequency division multiplex OFDM symbol, regulate sample clock frequency, the sample frequency after regulating is transferred to collecting unit;
Collecting unit, for receiving the sample frequency after described adjustment from regulon, sampling clock utilizes the sample frequency image data after described adjustment, image data is transferred to the second computing unit;
Second computing unit, for receiving described image data from collecting unit, utilizing described image data to calculate the second correlation, described second correlation being transferred to second and searches unit;
Second searches unit, for receiving described second correlation from the second computing unit, from described second correlation, finds out the second correlation peak.
Preferably, described computation of Period unit specifically for: the length of described sampling clock deviation with described OFDM symbol is multiplied, using multiplied result as described side-play amount.
Preferably, described first computing unit specifically for: utilize formula according to described side-play amount and image data
calculate described first correlation, wherein, m and n is integer; Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described first correlation in one-period; 0 < K < Nd+Ng, M is described side-play amount
for described first correlation, x
m+n+Nd+Kand x
m+Kfor described image data,
for x
m+Kconjugation, x
m+n+Nd+Kand x
m+Kbetween differ n+Nd data.
Further preferably, regulon specifically for:
When the cycle of described first correlation peak is less than the cycle of described OFDM symbol, then reduce described sample clock frequency;
When the cycle of described first correlation peak is greater than the cycle of described OFDM symbol, then reduce described sample clock frequency.
Further preferably, described second computing unit specifically for: utilize formula according to described side-play amount and image data
calculate described second correlation, wherein, m and n is integer; Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described second correlation in one-period; 0 < K < Nd+Ng, M is described side-play amount
for described second correlation, x
m+Nd+Kand x
m+Kfor the data of described collection,
for x
m+Kconjugation, x
m+Nd+Kand x
m+Kbetween differ Nd data.
In the embodiment of the present invention, according to the length determination side-play amount of sampling clock deviation and OFDM symbol, calculate the first correlation according to described side-play amount and image data, and find out the first correlation peak from the first correlation.Thus, the embodiment of the present invention achieves sample clock frequency when there is deviation, side-play amount is added correlation value calculation formula, thus calculates correlation peak.
Accompanying drawing explanation
Fig. 1 is multicarrier system model schematic in prior art;
Fig. 2 inserts protection interval schematic diagram before OFDM symbol in prior art;
Fig. 3 is OFDM symbol and correlation corresponding relation figure in prior art;
The correlation peak computational methods flow chart that Fig. 4 embodiment of the present invention provides;
The another correlation peak computational methods flow chart that Fig. 5 embodiment of the present invention provides;
The correlation peak calculation element schematic diagram that Fig. 6 embodiment of the present invention provides;
The another correlation peak calculation element schematic diagram that Fig. 7 embodiment of the present invention provides.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 3 is OFDM symbol and correlation corresponding relation figure in prior art.As shown in Figure 3, when sample clock frequency does not have deviation, formula is utilized
can correlation be calculated, wherein, R
kfor correlation, Ng is the length at protection interval, x
m+Nd+Kand x
m+Kfor the data gathered,
for x
m+Kconjugation, x
m+Nd+Kand x
m+Kbetween differ Nd data, K is the number of described second correlation in one-period, 0 < K < Nd+Ng.In correlation curve | R
k| be R
kmould, wherein, if x
m+Knot protection interval data, then the mould of the correlation obtained according to above-mentioned formulae discovery | R
k| less, the horizontal dotted line part in corresponding diagram in correlation curve; If x
m+Kprotection interval data, due to x
m+K=x
m+K+Nd(m=1,2,3..., Ng), then corresponding correlation R
kcan be expressed as:
The then mould of correlation | R
k| comparatively large, the dotted sections in corresponding correlation curve, therefrom can find out, there is correlation peak R in correlation
p, correlation peak R
pin corresponding OFDM symbol, the position of data is frame synchronization starting point, but in practical application, sample clock frequency all exists deviation, therefore, works as x
m+Kwhen being protection interval data, x
m+K≠ x
m+K+Nd(m=1,2,3..., Ng), there will not be correlation peak according in the correlation curve that above-mentioned formulae discovery obtains, thus cannot continue follow-up frame synchronization.
In the embodiment of the present invention, according to the length determination side-play amount of sampling clock deviation and OFDM symbol, calculate the first correlation according to described side-play amount and image data, and find out the first correlation peak from the first correlation.Thus, the embodiment of the present invention achieves sample clock frequency when there is deviation, side-play amount is added correlation value calculation formula, thus calculates correlation peak.
The correlation peak computational methods flow chart that Fig. 4 embodiment of the present invention provides.As shown in Figure 4, the method that the embodiment of the present invention provides comprises the following steps:
Step 401, according to the length determination side-play amount of sampling clock deviation and OFDM symbol.
When sample clock frequency exists deviation, utilize above-mentioned existing formula to calculate correlation peak, therefore, need to improve existing formula.
Particularly, formula can be utilized
calculate described first correlation, wherein, m and n is integer, and Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described first correlation in one-period, 0 < K < Nd+Ng,
for described first correlation, x
m+n+Nd+Kand x
m+Kfor described image data,
for x
m+Kconjugation, x
m+n+Nd+Kand x
m+Kbetween differ n+Nd data, M is described side-play amount, and the value of M is determined according to the size of sample clock frequency deviation.
For digital video broadcast-terrestrial (Digital Video Broadcasting-Terrestrial, DVB-T) 8K pattern, its OFDM symbol length is 8192.
Assuming that when sample clock frequency deviation is 120ppm (ppm is 1,000,000/), namely sample clock frequency is higher, then, in one-period, the image data number deviation caused thus is 8192 × 120 × 1 × 10
-6≈ 1, namely each cycle acquires 1 data more, and therefore, get M=1, then correlation formula is
Because each cycle acquires 1 data more, therefore during n=-1, x
i(i=m+K) (m=1,2 ... Ng) be when protecting interval data, then x
i=x
i+8192-1, as can be seen from above-mentioned formula, wherein
For correlation peak.
Assuming that when sample clock frequency deviation is-120ppm (ppm is 1,000,000/), namely sample clock frequency is on the low side, then, in one-period, the image data number deviation caused thus is-8192 × 120 × 1 × 10
-6≈-1, namely each cycle acquires 1 data less, and therefore, get M=-1, then correlation value calculation formula is
Because each cycle acquires 1 data less, therefore during n=1, and x
i(i=m+K) (m=1,2 ... Ng) be when protecting interval data, then x
i=x
i+8192+1, as can be seen from above-mentioned formula, wherein
For correlation peak.
This shows, no matter sample clock frequency is higher or on the low side, always a determined value of side-play amount M can be found out, after carrying it into above-mentioned first correlation computing formula, correlation curve can be made to occur correlation peak.
Step 402, calculates the first correlation according to described side-play amount and image data.
After above-mentioned steps determination side-play amount M, the first correlation can be calculated.
Step 403, finds out the first correlation peak of described first correlation from described first correlation.
In the embodiment of the present invention, according to the length determination side-play amount of sampling clock deviation and OFDM symbol, calculate the first correlation according to described side-play amount and image data, and find out the first correlation peak from the first correlation.Thus, the embodiment of the present invention achieves sample clock frequency when there is deviation, side-play amount is added correlation value calculation formula, thus calculates correlation peak.
Preferably, the another correlation peak computational methods flow chart that provides of Fig. 5 embodiment of the present invention.As shown in Figure 5, the method for the embodiment of the present invention comprises the following steps:
Elaborate in step 501-503 step 401-403 in the above-described embodiments, do not repeat again at this.
Step 504, calculates the cycle of described first correlation peak.
Particularly, according to the time interval of adjacent two the first correlation peaks, the cycle of the first correlation peak is calculated.
Step 505, according to the relation in the cycle of described first correlation peak and the cycle of orthogonal frequency division multiplex OFDM symbol, regulates sample clock frequency.
Can obviously find out from Fig. 3, when not having sample clock frequency deviation, the position of each correlation peak is consistent with position, GI and OFDM boundary in its corresponding OFDM symbol.But, when there is sample clock frequency deviation, through the first correlation peak that step 501-503 calculates, its position can inclined 1 from position, GI and OFDM boundary in OFDM symbol, namely the cycle of the first correlation peak and the cycle of OFDM symbol can be inconsistent, therefore, need to regulate.
Particularly, when the cycle of described first correlation peak is less than the cycle of described OFDM symbol, then described sample clock frequency is reduced;
When the cycle of described first correlation peak is greater than the cycle of described OFDM symbol, then reduce described sample clock frequency.
It should be noted that, need to regulate through one or many, just sampling clock can be adjusted in suitable frequency.
It should be noted that, the value of side-play amount M can not be too large, and M more Iarge-scale 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 according to actual conditions the size determining M.
Step 506, sampling clock utilizes the sample frequency image data after described adjustment.
Step 507, utilizes the data gathered to calculate the second correlation.
Particularly, through above-mentioned steps, sampling clock is adjusted to after in suitable frequency, now, the formulae discovery correlation of existing calculating correlation can be adopted, namely
wherein, R
kbe the second correlation, Ng is the length at protection interval, x
m+Nd+Kand x
m+Kfor the data gathered,
for x
m+Kconjugation, x
m+Nd+Kand x
m+Kbetween differ Nd data, K is the number of described second correlation in one-period, 0 < K < Nd+Ng.For making a distinction with the first correlation in step 502, correlation is here called the second correlation.
Step 508, finds out the second correlation peak from described second correlation.
What above-described embodiment described is, when there is deviation in sample clock frequency, according to sample clock frequency deviation determination side-play amount, the first correlation is calculated according to side-play amount, the peak value of the first correlation is found out from the first correlation, and calculate the cycle of the first correlation, sample clock frequency is regulated according to the cycle of the first correlation and the period-luminosity relation of OFDM symbol, till in time being adjusted to by sample clock frequency very little on the calculating impact of correlation peak, at this moment adopt existing correlation value calculation formula just can calculate correlation peak again.
Accordingly, the embodiment of the present invention provides a kind of correlation peak calculation element, the correlation peak calculation element schematic diagram that Fig. 6 embodiment of the present invention provides.As shown in Figure 6, the device that the embodiment of the present invention provides comprises:
Determining unit 601, for the length determination side-play amount according to sampling clock deviation and OFDM symbol, transfers to the first computing unit by described side-play amount.
First computing unit 602, for receiving described side-play amount from determining unit, calculates the first correlation according to described side-play amount and image data, described first correlation is transferred to first and searches unit.
First searches unit 603, for receiving described first correlation from the first computing unit, finds out the first correlation peak of described first correlation from described first correlation.
In the embodiment of the present invention, according to the length determination side-play amount of sampling clock deviation and OFDM symbol, calculate the first correlation according to described side-play amount and image data, and find out the first correlation peak from the first correlation.Thus, the embodiment of the present invention achieves sample clock frequency when there is deviation, side-play amount is added correlation value calculation formula, thus calculates correlation peak.
Preferably, the another correlation peak calculation element schematic diagram that provides of Fig. 7 embodiment of the present invention.As shown in Figure 7, the device that the embodiment of the present invention provides comprises:
It is the same with the function that determining unit 601, first computing unit 602 and first in above-described embodiment searches unit 603 that determining unit 701, first computing unit 702 and first searches the function of unit 703, do not repeat again at this.
Computation of Period unit 704, receiving described first correlation peak for searching unit from first, calculating the cycle of described first correlation peak, by the periodic transfer of described first correlation peak to regulon.
Regulon 705, for receiving the cycle of described first correlation peak from computation of Period unit, according to the relation in the cycle of described first correlation peak and the cycle of orthogonal frequency division multiplex OFDM symbol, regulate sample clock frequency, the sample frequency after regulating is transferred to the second computing unit.
Collecting unit 706, for receiving the sample frequency after described adjustment from regulon, sampling clock utilizes the sample frequency image data after described adjustment, image data is transferred to the second computing unit.
Second computing unit 707, for receiving described image data from collecting unit, utilizing described image data to calculate the second correlation, described second correlation being transferred to second and searches unit.
Second searches unit 708, for receiving described second correlation from the second computing unit, from described second correlation, finds out the second correlation peak.
What above-described embodiment described is, when there is deviation in sample clock frequency, according to sample clock frequency deviation determination side-play amount, the first correlation is calculated according to side-play amount, the peak value of the first correlation is found out from the first correlation, and calculate the cycle of the first correlation, sample clock frequency is regulated according to the cycle of the first correlation and the period-luminosity relation of OFDM symbol, till in time being adjusted to by sample clock frequency very little on the calculating impact of correlation peak, at this moment adopt existing correlation value calculation formula just can calculate correlation peak again.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. correlation peak computational methods, is characterized in that, described method comprises:
According to the length determination side-play amount of sampling clock deviation and OFDM symbol;
The first correlation is calculated according to described side-play amount and image data;
The first correlation peak of described first correlation is found out from described first correlation;
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
calculate described first correlation, wherein, m and n is integer; Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described first correlation in one-period; 0<K<Nd+Ng, M are described side-play amount
for described first correlation, x
m+n+Nd+Kand x
m+Kfor described image data,
for x
m+Kconjugation, x
m+n+Nd+Kand x
m+Kbetween differ n+Nd data.
2. the method for claim 1, is characterized in that, described method also comprises:
Calculate the cycle of described first correlation peak;
According to the relation in the cycle of described first correlation peak and the cycle of orthogonal frequency division multiplex OFDM symbol, regulate sample clock frequency;
Sampling clock utilizes the sample frequency image data after described adjustment;
The data gathered are utilized to calculate the second correlation;
The second correlation peak is found out from described second correlation.
3. the method for claim 1, is characterized in that, is describedly specially with the length determination side-play amount of OFDM symbol according to sampling clock deviation: be multiplied, the length of described sampling clock deviation with described OFDM symbol using multiplied result as described side-play amount.
4. method as claimed in claim 2, is characterized in that, described according to the relation of the cycle of described first correlation peak with the cycle of orthogonal frequency division multiplex OFDM symbol, adjustment sample clock frequency specifically comprises:
When the cycle of described first correlation peak is less than the cycle of described OFDM symbol, then reduce described sample clock frequency;
When the cycle of described first correlation peak is greater than the cycle of described OFDM symbol, then reduce described sample clock frequency.
5. method as claimed in claim 2, is characterized in that, the data that described utilization gathers calculate the second correlation and are specially: utilize formula according to described side-play amount and image data
calculate described second correlation, wherein, m and n is integer; Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described second correlation in one-period; 0<K<Nd+Ng, M are described side-play amount, R
kfor described second correlation, x
m+Nd+Kand x
m+Kfor the data of described collection,
for x
m+Kconjugation, x
m+Nd+Kand x
m+Kbetween differ Nd data.
6. a correlation peak calculation element, is characterized in that, described device comprises:
Determining unit, for the length determination side-play amount according to sampling clock deviation and OFDM symbol, transfers to the first computing unit by described side-play amount;
First computing unit, for receiving described side-play amount from determining unit, calculates the first correlation according to described side-play amount and image data, described first correlation is transferred to first and searches unit;
First searches unit, for receiving described first correlation from the first computing unit, finds out the first correlation peak of described first correlation from described first correlation;
Described first computing unit specifically for: utilize formula according to described side-play amount and image data
calculate described first correlation, wherein, m and n is integer; Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described first correlation in one-period; 0<K<Nd+Ng, M are described side-play amount
for described first correlation, x
m+n+Nd+Kand x
m+Kfor described image data,
for x
m+Kconjugation, x
m+n+Nd+Kand x
m+Kbetween differ n+Nd data.
7. device as claimed in claim 6, it is characterized in that, described device also comprises:
Computation of Period unit, receiving described first correlation peak for searching unit from first, calculating the cycle of described first correlation peak, by the periodic transfer of described first correlation peak to regulon;
Regulon, for receiving cycle of described first correlation peak from computation of Period unit, according to the relation of the described cycle of the first correlation peak with the cycle of OFDM symbol, regulating sample clock frequency, the sample frequency after adjustment is transferred to collecting unit;
Collecting unit, for receiving the sample frequency after described adjustment from regulon, sampling clock utilizes the sample frequency image data after described adjustment, image data is transferred to the second computing unit;
Second computing unit, for receiving described image data from collecting unit, utilizing described image data to calculate the second correlation, described second correlation being transferred to second and searches unit;
Second searches unit, for receiving described second correlation from the second computing unit, from described second correlation, finds out the second correlation peak.
8. device as claimed in claim 7, is characterized in that, described computation of Period unit specifically for: the length of described sampling clock deviation with described OFDM symbol is multiplied, using multiplied result as described side-play amount.
9. device as claimed in claim 7, is characterized in that, described regulon specifically for:
When the cycle of described first correlation peak is less than the cycle of described OFDM symbol, then reduce described sample clock frequency;
When the cycle of described first correlation peak is greater than the cycle of described OFDM symbol, then reduce described sample clock frequency.
10. device as claimed in claim 7, is characterized in that, described second computing unit specifically for: utilize formula according to described side-play amount and image data
calculate described second correlation, wherein, m and n is integer; Ng is the length at protection interval, and Nd is the length of Fourier transform, and K is the number of described second correlation in one-period; 0<K<Nd+Ng, M are described side-play amount, R
kfor described second correlation, x
m+Nd+Kand x
m+Kfor the data of described collection,
for x
m+Kconjugation, x
m+Nd+Kand x
m+Kbetween differ Nd data.
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