CN101808061B - Frequency offset estimation method and device - Google Patents
Frequency offset estimation method and device Download PDFInfo
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- CN101808061B CN101808061B CN201010132712.0A CN201010132712A CN101808061B CN 101808061 B CN101808061 B CN 101808061B CN 201010132712 A CN201010132712 A CN 201010132712A CN 101808061 B CN101808061 B CN 101808061B
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Abstract
The embodiment of the invention relates to a frequency offset estimation method and a device, which are used for realizing and obtaining quite accurate frequency offset value, so as to improve the frequency offset compensation effect. The method comprises the following steps that: the maximum amplitude time delay distribution value of a captured leading signal on all preset frequency offset values is obtained; a first frequency offset value corresponding to the maximum amplitude time delay distribution value in a plurality of maximum amplitude time delay distribution values is determined; the first frequency offset value is adjusted according to a preset second frequency offset value which is adjacent to the first frequency offset value; wherein, the preset frequency offset values are lined according to size, and the first frequency offset value and the second frequency offset value are all one frequency offset value in the plurality of the frequency offset values; and the adjusted first frequency offset value is determined to be the estimated final frequency offset value. The invention also discloses a device for realizing the method.
Description
Technical field
The present invention relates to the communications field, particularly relate to frequency deviation estimating method and device.
Background technology
The user of second generation mobile communication system can only carry out work on a carrier wave at present.Be different from second generation mobile communication system, one of outstanding feature of third generation communication network (3G) is exactly to support high-speed data service.Along with the development of technology, Beyond3G and 4G can realize the message transmission rate of 100Mbit/s, even higher, and the business of support, from speech to multimedia business, comprises real-time streaming media service.Message transmission rate will be required according to these business rate dynamic adjustment.Meanwhile, next generation mobile communication also will be realized two-forty and large capacity on limited frequency spectrum resource, needs the high technology of spectrum efficiency.Frequency deviation estimates it is one of important technology improving spectrum efficiency.
In prior art, when separating preface information, the general a plurality of compensate of frequency deviation values that are fixedly installed that adopt are carried out compensate of frequency deviation and demodulation simultaneously, only configure 3 preset frequency deviations under general wireless scene.Then judge the leading energy maximum of the demodulation result of which compensate of frequency deviation value, just in the process of separating access message, by this compensate of frequency deviation value, carry out compensate of frequency deviation.
When the speed per hour of the bullet trains such as magnetic suspension reaches 430Km/h, corresponding maximum Doppler frequency offset can reach nearly 2000Hz, if adopting current random access frequency deviation estimates and compensation method, 3 preset frequency deviations cannot be satisfied the demand, even preset more frequency deviation, as preset 7, the accuracy that frequency deviation is estimated is still poor.
Summary of the invention
The embodiment of the present invention provides a kind of frequency deviation estimating method and device, for realizing acquisition frequency deviation value more accurately, to improve the effect of compensate of frequency deviation.
A frequency deviation estimating method, comprises the following steps:
The maximum amplitude time delay distribution value of the targeting signal that acquisition is caught on each preset frequency deviation value;
Determine the first frequency deviation value corresponding to maximum amplitude time delay distribution value maximum in a plurality of maximum amplitude time delay distribution value;
Obtain preset maximum amplitude time delay distribution value corresponding to the second frequency deviation value that the first frequency deviation value is adjacent with the first frequency deviation value;
According to two maximum amplitude time delay distribution value that obtain, carry out interpolation calculation, the amount of being adjusted, according to the adjustment amount obtaining, the first frequency deviation value is adjusted to the direction of the second frequency deviation value, the first frequency deviation value after being adjusted, determines the final frequency deviation value that the first frequency deviation value after adjusting obtains for estimation; Or
The averaged frequency offset value of the first frequency deviation value preset second frequency deviation value adjacent with the first frequency deviation value is defined as estimating the final frequency deviation value obtaining.
A communication equipment, comprising:
Detection module, for obtaining the targeting signal of the catching maximum amplitude time delay distribution value on each preset frequency deviation value;
Comparison module, for the first frequency deviation value corresponding to maximum amplitude time delay distribution value of determining that a plurality of maximum amplitude time delay distribution value are maximum;
Adjusting module, for obtaining preset maximum amplitude time delay distribution value corresponding to the second frequency deviation value that the first frequency deviation value is adjacent with the first frequency deviation value;
According to two maximum amplitude time delay distribution value that obtain, carry out interpolation calculation, the amount of being adjusted, according to the adjustment amount obtaining, the first frequency deviation value is adjusted to the direction of the second frequency deviation value, the first frequency deviation value after being adjusted, determines the final frequency deviation value that the first frequency deviation value after adjusting obtains for estimation; Or
The averaged frequency offset value of the first frequency deviation value preset second frequency deviation value adjacent with the first frequency deviation value is defined as estimating the final frequency deviation value obtaining.
The embodiment of the present invention is by the first frequency deviation value corresponding to maximum maximum amplitude time delay distribution value, determine second frequency deviation value adjacent with the first frequency deviation value, and according to the second frequency deviation value, the first frequency deviation value is adjusted, thereby obtain frequency deviation estimated value more accurately, to better carry out compensate of frequency deviation.
Accompanying drawing explanation
Fig. 1 is the main method flow chart that embodiment of the present invention frequency deviation is estimated;
Fig. 2 is that the frequency deviation of according to the second adjacent frequency deviation value, the first frequency deviation value being adjusted in the embodiment of the present invention is estimated flow chart;
Fig. 3 is the frequency deviation estimation flow chart that according to the second adjacent frequency deviation value, the first frequency deviation value is carried out to interpolation calculation and adjust in the embodiment of the present invention;
Fig. 4 is the primary structure figure of communication equipment in the embodiment of the present invention;
Fig. 5 is the detailed structure view of communication equipment in the embodiment of the present invention.
Embodiment
The embodiment of the present invention is by the first frequency deviation value corresponding to maximum maximum amplitude time delay distribution value, determine second frequency deviation value adjacent with the first frequency deviation value, and according to the second frequency deviation value, the first frequency deviation value is adjusted, thereby obtain frequency deviation estimated value more accurately, to better carry out compensate of frequency deviation.
Referring to Fig. 1, the main method flow process that the present embodiment frequency deviation is estimated is as follows:
Step 101: the maximum amplitude time delay distribution value of the targeting signal that acquisition is caught on each preset frequency deviation value.In the present embodiment, targeting signal can be specially the preamble signature repetition 256 times of appointment the signal that multiplies each other and obtain with scrambler.
Step 102: determine the first frequency deviation value corresponding to maximum amplitude time delay distribution value maximum in a plurality of maximum amplitude time delay distribution value.
Step 103: the first frequency deviation value is adjusted according to the second preset frequency deviation value that the first frequency deviation value is adjacent.
Step 104: determine the final frequency deviation value that the first frequency deviation value after adjusting obtains for estimation.
Can further according to final frequency deviation value, carry out the demodulation compensate of frequency deviation of message.
Wherein, the number of preset frequency deviation value is that the maximum frequency deviation scope that can produce according to preset frequency deviation interval Bin and applied channel circumstance is determined, and the maximum frequency deviation that applied channel circumstance can produce is according to the Doppler frequency deviation decision of speed of a motor vehicle correspondence generation maximum under this channel circumstance.The size of Bin is to determine according to the energy time delay of detection of preamble (PDP) the energy loss situation when the different frequency deviation that distributes.For different coherent integration length, PDP is different with the situation of frequency deviation energization loss, in order to guarantee that severe exacerbation does not occur the performance of detection of preamble, need to control preset frequency deviation interval, can artificially set according to factor in many ways.But Bin cannot surpass preset maximum frequency deviation interval MaxBin.MaxBin is confined to coherent integration length, is generally that coherent integration length is larger, and configurable MaxBin is less, and coherent integration length is limited to Doppler frequency deviation expansion, therefore, by analyzing the Doppler frequency deviation of respective wireless scene, expand, can finally obtain MaxBin.For example, MaxBin can obtain automatically according to selected coherent integration length,
The mode of in the present embodiment, the first frequency deviation value being adjusted has multiple, below by two exemplary embodiments, introduces in detail.
Referring to Fig. 2, the frequency deviation of according to the second adjacent frequency deviation value, the first frequency deviation value being adjusted in the present embodiment estimates that flow process is as follows:
Step 201: the maximum amplitude time delay distribution value a of the targeting signal that acquisition is caught on each preset frequency deviation value
1..., a
i... a
n, N is the sum of preset frequency deviation value, a
irepresent i the maximum amplitude time delay distribution value on frequency deviation value.Conventionally preset a plurality of frequency deviation values, according to each frequency deviation value, measure a plurality of amplitude time delay distribution, and determine maximum amplitude time delay distribution value corresponding to each frequency deviation value.
Step 202: determine the first frequency deviation value f corresponding to maximum amplitude time delay distribution value maximum in a plurality of maximum amplitude time delay distribution value
k.
Step 203: judge whether the first frequency deviation value is maximum frequency deviation value or minimum frequency deviation value in preset a plurality of frequency deviation values, if so, continues step 206, otherwise continue step 204.A plurality of frequency deviation values preset in the present embodiment are arranged (or descending order is arranged) according to ascending order, can be expressed as f
1f
kf
n.This step judges that whether k is 1 or N.
When being judged as NO, illustrate that k is neither 1 also not for N, the right and left of the first frequency deviation value has two adjacent preset frequency deviation values (i.e. two the second frequency deviation values), need to continue step 204.
When being judged as YES, the left or right of the first frequency deviation value only has an adjacent preset frequency deviation value (i.e. second frequency deviation value), need to continue step 206.
Step 204: determine two maximum amplitude time delay distribution value that the second frequency deviation value is corresponding.In step 201, obtained the maximum amplitude time delay distribution value that each frequency deviation value is corresponding, this step is directly utilized the result of step 201.
Step 205: obtain the second frequency deviation value corresponding to maximum amplitude time delay distribution value larger in two maximum amplitude time delay distribution value.
Step 206: whether the maximum amplitude time delay distribution value that judges the second frequency deviation value is greater than default secondary lobe threshold value (this secondary lobe threshold value was set before step 206), if so, continues step 207, otherwise continue step 208.By this step, can filter out the impact that secondary lobe is estimated frequency deviation.If do not consider the impact of secondary lobe, can omit this step, and continue step 207.
Step 207: the averaged frequency offset value of the first frequency deviation value and the second frequency deviation value is defined as to the final frequency deviation value that estimation obtains.
Step 208: the first frequency deviation value is defined as to the final frequency deviation value that estimation obtains.
Referring to Fig. 3, the frequency deviation of according to the second adjacent frequency deviation value, the first frequency deviation value being carried out to interpolation calculation adjustment in the present embodiment estimates that flow process is as follows:
Step 301: the maximum amplitude time delay distribution value of the targeting signal that acquisition is caught on each preset frequency deviation value.
Step 302: determine the first frequency deviation value f corresponding to maximum amplitude time delay distribution value maximum in a plurality of maximum amplitude time delay distribution value
k.
Step 303: judge whether the first frequency deviation value is maximum frequency deviation value or minimum frequency deviation value in preset a plurality of frequency deviation values, if so, continues step 306, otherwise continue step 304.A plurality of frequency deviation values preset in the present embodiment are arranged according to ascending order, can be expressed as f
1f
kf
n.This step judges that whether k is 1 or N.
Step 304: determine two maximum amplitude time delay distribution value that the second frequency deviation value is corresponding.
Step 305: obtain the second frequency deviation value corresponding to maximum amplitude time delay distribution value larger in two maximum amplitude time delay distribution value.
Step 306: whether the maximum amplitude time delay distribution value that judges the second frequency deviation value is greater than default secondary lobe threshold value, if so, continues step 307, otherwise continue step 311.
Step 307: obtain the first frequency deviation value and maximum amplitude time delay distribution value a corresponding to the second frequency deviation value
kand a
k+1.
Step 308: carry out interpolation calculation, the amount of being adjusted according to two maximum amplitude time delay distribution value that obtain.The adjustment amount obtaining is
Step 309: according to the adjustment amount obtaining, the first frequency deviation value is adjusted to the first frequency deviation value after being adjusted to the direction of the second frequency deviation value.If the second frequency deviation value is greater than the first frequency deviation value, on the basis of the first frequency deviation value, add adjustment amount; If the second frequency deviation value is less than the first frequency deviation value, on the basis of the first frequency deviation value, deducts adjustment amount, or adjustment amount is expressed as
a
k-1be the second frequency deviation value maximum amplitude time delay distribution value corresponding to the second frequency deviation value while being less than the first frequency deviation value, on the basis of the first frequency deviation value, deduct adjustment amount and can be exchanged on the basis of the first frequency deviation value and add adjustment amount
Step 310: determine the final frequency deviation value f that the first frequency deviation value after adjusting obtains for estimation
est.
Step 311: the first frequency deviation value is defined as to the final frequency deviation value f that estimation obtains
est.
Wherein, step 306-309 can unify to be formulated as:
More than described the implementation procedure that frequency deviation is estimated, this process can be realized by communication equipment, below the internal structure of communication equipment and function is introduced.
Referring to Fig. 4, in the present embodiment, communication equipment comprises: detection module 401, comparison module 402 and adjusting module 403.This communication equipment can be that network equipment also can terminal side equipment.
First frequency deviation value corresponding to maximum amplitude time delay distribution value of comparison module 402 for determining that a plurality of maximum amplitude time delay distribution value are maximum.
Adjusting module 403 is for according to adjacent the second preset frequency deviation value of the first frequency deviation value, the first frequency deviation value being adjusted, and the final frequency deviation value of the first frequency deviation value after definite adjustment for estimating to obtain.Adjusting module 403 obtains the first frequency deviation value and maximum amplitude time delay distribution value corresponding to the second frequency deviation value, according to two maximum amplitude time delay distribution value that obtain, carry out interpolation calculation, the amount of being adjusted, and according to the adjustment amount obtaining, the first frequency deviation value is adjusted to the first frequency deviation value after being adjusted to the direction of the second frequency deviation value.Adjusting module 403 also judges that whether the second frequency deviation value has two, if so, adjusts the first frequency deviation value according to the second frequency deviation value larger in two the second frequency deviation values.Adjusting module 403 is also for performing step 206～208 and step 306～311.
Communication equipment also comprises: control module 404, and shown in Figure 5.
Communication equipment also comprises: interface module 405 and compensating module 406.Interface module 405 is for receiving targeting signal etc.Compensating module 406 is for carrying out the compensate of frequency deviation of message demodulation according to final frequency deviation value.
For realizing the software of the embodiment of the present invention, can be stored in the storage mediums such as hard disk, CD, flash memory or buffer memory.
The embodiment of the present invention is by the first frequency deviation value corresponding to maximum maximum amplitude time delay distribution value, determine second frequency deviation value adjacent with the first frequency deviation value, and according to the second frequency deviation value, the first frequency deviation value is adjusted, thereby obtain frequency deviation estimated value more accurately, to better carry out compensate of frequency deviation.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (10)
1. a frequency deviation estimating method, is characterized in that, the method comprises:
The maximum amplitude time delay distribution value of the targeting signal that acquisition is caught on each preset frequency deviation value;
Determine the first frequency deviation value corresponding to maximum amplitude time delay distribution value maximum in a plurality of maximum amplitude time delay distribution value;
Obtain preset maximum amplitude time delay distribution value corresponding to the second frequency deviation value that the first frequency deviation value is adjacent with the first frequency deviation value;
According to two maximum amplitude time delay distribution value that obtain, carry out interpolation calculation, the amount of being adjusted, according to the adjustment amount obtaining, the first frequency deviation value is adjusted to the direction of the second frequency deviation value, the first frequency deviation value after being adjusted, determines the final frequency deviation value that the first frequency deviation value after adjusting obtains for estimation; Or
The averaged frequency offset value of the first frequency deviation value preset second frequency deviation value adjacent with the first frequency deviation value is defined as estimating the final frequency deviation value obtaining.
2. the method for claim 1, is characterized in that, the adjustment amount obtaining is
wherein, MaxBin is maximum frequency deviation interval, and Bin is preset frequency deviation interval, a
kbe the maximum amplitude time delay distribution value that the first frequency deviation value is corresponding, a
k+1it is the maximum amplitude time delay distribution value that the second frequency deviation value is corresponding.
3. the method for claim 1, it is characterized in that, also comprise step: after maximum amplitude time delay distribution value corresponding to acquisition the first frequency deviation value preset second frequency deviation value adjacent with the first frequency deviation value, judge whether the maximum amplitude time delay distribution value that the second frequency deviation value is corresponding is greater than default secondary lobe threshold value;
When being greater than secondary lobe threshold value, according to two maximum amplitude time delay distribution value that obtain, carry out interpolation calculation, the amount of being adjusted, according to the adjustment amount obtaining, the first frequency deviation value is adjusted to the direction of the second frequency deviation value, the first frequency deviation value after being adjusted, determines the final frequency deviation value that the first frequency deviation value after adjusting obtains for estimation; Or
The averaged frequency offset value of the first frequency deviation value preset second frequency deviation value adjacent with the first frequency deviation value is defined as estimating the final frequency deviation value obtaining.
4. method as claimed in claim 3, is characterized in that, when being not more than secondary lobe threshold value, determines the final frequency deviation value of the first frequency deviation value for estimating to obtain.
5. the method as described in any one in claim 1 to 4, it is characterized in that, after maximum amplitude time delay distribution value corresponding to acquisition the first frequency deviation value preset second frequency deviation value adjacent with the first frequency deviation value, when the second frequency deviation value has two, obtain the second frequency deviation value corresponding to maximum amplitude time delay distribution value larger in two maximum amplitude time delay distribution value.
6. the method for claim 1, is characterized in that, preset a plurality of frequency deviation values are arranged according to size order, and the first frequency deviation value and the second frequency deviation value are a frequency deviation value in the plurality of frequency deviation value.
7. a communication equipment, is characterized in that, comprising:
Detection module, for obtaining the targeting signal of the catching maximum amplitude time delay distribution value on each preset frequency deviation value;
Comparison module, for the first frequency deviation value corresponding to maximum amplitude time delay distribution value of determining that a plurality of maximum amplitude time delay distribution value are maximum;
Adjusting module, for obtaining preset maximum amplitude time delay distribution value corresponding to the second frequency deviation value that the first frequency deviation value is adjacent with the first frequency deviation value;
According to two maximum amplitude time delay distribution value that obtain, carry out interpolation calculation, the amount of being adjusted, according to the adjustment amount obtaining, the first frequency deviation value is adjusted to the direction of the second frequency deviation value, the first frequency deviation value after being adjusted, determines the final frequency deviation value that the first frequency deviation value after adjusting obtains for estimation; Or
The averaged frequency offset value of the first frequency deviation value preset second frequency deviation value adjacent with the first frequency deviation value is defined as estimating the final frequency deviation value obtaining.
8. communication equipment as claimed in claim 7, is characterized in that, also comprises: control module, for judging whether the maximum amplitude time delay distribution value that the second frequency deviation value is corresponding is greater than default secondary lobe threshold value;
Adjusting module is when being greater than secondary lobe threshold value, according to two maximum amplitude time delay distribution value that obtain, carry out interpolation calculation, the amount of being adjusted, according to the adjustment amount obtaining, the first frequency deviation value is adjusted to the direction of the second frequency deviation value, the first frequency deviation value after being adjusted, determines the final frequency deviation value that the first frequency deviation value after adjusting obtains for estimation; Or
The averaged frequency offset value of the first frequency deviation value preset second frequency deviation value adjacent with the first frequency deviation value is defined as estimating the final frequency deviation value obtaining;
When being not more than secondary lobe threshold value, determine the final frequency deviation value of the first frequency deviation value for estimating to obtain.
9. the communication equipment as described in any one in claim 7 to 8, is characterized in that, when the second frequency deviation value has two, obtains the second frequency deviation value corresponding to maximum amplitude time delay distribution value larger in two maximum amplitude time delay distribution value.
10. communication equipment as claimed in claim 7, is characterized in that, preset a plurality of frequency deviation values are arranged according to size order, and the first frequency deviation value and the second frequency deviation value are a frequency deviation value in the plurality of frequency deviation value.
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| CN103716896B (en) * | 2012-09-29 | 2017-02-08 | 京信通信系统（中国）有限公司 | Method and device for frequency offset estimation and compensation |
| CN108270705B (en) * | 2016-12-30 | 2020-11-03 | 奉加微电子（上海）有限公司 | Demodulation device and demodulation method for frequency modulation signal |
| CN108289068B (en) * | 2017-01-10 | 2020-05-26 | 大唐移动通信设备有限公司 | Frequency offset compensation method and device |
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| CN1477807A (en) * | 2003-08-04 | 2004-02-25 | �����ƶ�ͨ���豸����˾ | Method for obtaining carrier frequency departure of time division synchronous CDMA (TD-SCDMA) user terminal and equipment |
| CN101277290A (en) * | 2007-03-26 | 2008-10-01 | 富士通株式会社 | Method and apparatus for synchronization of orthogonal frequency division multiplexing system frequency |
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| US7852909B2 (en) * | 2007-05-04 | 2010-12-14 | Beceem Communications Inc. | Method and apparatus for estimating frequency offset and timing offset of one or more mobile stations (MSs) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1477807A (en) * | 2003-08-04 | 2004-02-25 | �����ƶ�ͨ���豸����˾ | Method for obtaining carrier frequency departure of time division synchronous CDMA (TD-SCDMA) user terminal and equipment |
| CN101277290A (en) * | 2007-03-26 | 2008-10-01 | 富士通株式会社 | Method and apparatus for synchronization of orthogonal frequency division multiplexing system frequency |
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Effective date of registration: 20200819 Address after: 210012 Nanjing, Yuhuatai District, South Street, Bauhinia Road, No. 68 Patentee after: Nanjing Zhongxing Software Co.,Ltd. Address before: 518057 Nanshan District Guangdong high tech Industrial Park, South Road, science and technology, ZTE building, Ministry of Justice Patentee before: ZTE Corp. |