CN102740314A - Receiving channel delay correction method, device and base station with device - Google Patents
Receiving channel delay correction method, device and base station with device Download PDFInfo
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Abstract
The embodiment of the invention discloses an LTE receiving channel delay correction method, a device and a base station with the device. The method comprises the steps of receiving uplink sounding signals of multiple users with multiple antennas; selecting a user from multiple users as a set user, and according to the uplink sounding signal of the set user acquiring the power delay spectrum of the set user in each receiving channel; according to the power delay spectrum of each receiving channel respectively acquiring the delay value of each receiving channel; and according to the delay value of each receiving channel respectively carrying out delay adjustment on each receiving channel. In this embodiment, the characteristic that the LTE system needs to employ the sounding signal of the user and a power delay spectrum estimation algorithm to compute the PDP estimation so as to obtain the power delay spectrum is employed, and then the delay adjustment value is obtained according to the power delay spectrum, thus the delay correction of the radio frequency receiving channel in the base station is realized.
Description
Technical field
The present invention relates to communication technique field, more particularly, relate to a kind of receive path time-delay bearing calibration, install and have the base station of this device.
Background technology
In LTE (Long Term Evolution, Long Term Evolution) wireless communication system, closed-loop MIMO (Multiple-Input Multiple-Out-put, MIMO antenna system) technology has obtained using widely.Though the closed-loop MIMO technology is the elevator system performance effectively, coherence request that should technology centering radio-frequency channel is very high, if middle radio frequency reception channel exists bigger time delay or phase deviation, will cause the performance severe exacerbation of closed-loop MIMO.
Therefore in real system; In to proofread and correct be very important in the radio-frequency channel, comprise the correction of transmitting channel correction and receive path, through these proofread and correct guarantee in time delay between a plurality of passages of radio frequency consistent with phase place; Channel correcting method relatively more commonly used is through sending the correction sequence signal of some characteristics; According to signal time delay or phase difference after handling through passage, the centering radio-frequency channel is adjusted, thereby reaches the purpose of channel correcting then.
Concrete; In the prior art; Wherein there is a kind of scheme to be: on idle sub-carrier, to send specific known signal to the reception channel correcting; The sub-carrier signal that will pass through different passages at receiving terminal is then cut apart according to different passages, and the estimated value of the different channel characteristics of abstraction reaction achieves a butt joint according to estimated value then and receives the correction of passage.Since this method need be on idle sub-carrier the correction sequence of transfer characteristic, therefore when system loading bigger, when not having idle sub-carrier, this method just can't have been used.In addition, be specific correction sequence owing to what send in this method, therefore must handle, thereby obtain corresponding passage estimated value, so introduced additional calculation this sequence.
In sum, technical scheme of the prior art can't avoided extra resource overhead to the uplink receiving channel timing.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of LTE receive path time-delay bearing calibration, installs and have the base station of this device.
The embodiment of the invention provides a kind of LTE receive path time-delay bearing calibration, comprising:
Receive a plurality of users' uplink detection signal through a plurality of antennas;
In said a plurality of users, select a user for setting the user, according to the said power delay spectrum of setting user's the said setting of uplink detection signal acquisition user at each receive path;
Obtain the time delay value of each receive path respectively according to the power delay spectrum of each receive path;
According to the time delay value of each receive path, respectively each receive path is carried out the time delay adjustment.
In addition, the embodiment of the invention also provides a kind of LTE receive path time-delay means for correcting, comprising:
Antenna sets is used to receive a plurality of users' uplink detection signal;
The power delay spectrum acquiring unit; Be used to receive a plurality of users' that a plurality of antennas receive uplink detection signal; In said a plurality of users, select a user for setting the user, according to the said power delay spectrum of setting user's the said setting of uplink detection signal acquisition user at each receive path;
Time delay value obtains the unit, is used for obtaining respectively according to the power delay spectrum of each receive path the time delay value of each receive path;
The time delay adjustment unit is used for the time delay value according to each receive path, respectively each receive path is carried out the time delay adjustment.
In addition, the embodiment of the invention also provides a kind of base station, comprises LTE receive path time-delay means for correcting;
Said LTE receive path time-delay means for correcting comprises:
Antenna sets is used to receive a plurality of users' uplink detection signal;
The power delay spectrum acquiring unit; Be used to receive a plurality of users' that a plurality of antennas receive uplink detection signal; In said a plurality of users, select a user for setting the user, according to the said power delay spectrum of setting user's the said setting of uplink detection signal acquisition user at each receive path;
Time delay value obtains the unit, is used for obtaining respectively according to the power delay spectrum of each receive path the time delay value of each receive path;
The time delay adjustment unit is used for the time delay value according to each receive path, respectively each receive path is carried out the time delay adjustment.
Can draw through technique scheme; In embodiments of the present invention; Utilized the user's who in the LTE system, just exists detectable signal itself; Adopt the power delay spectrum algorithm for estimating to obtain this characteristic of power delay spectrum, draw through can obtaining the time delay adjustment amount according to said power delay spectrum then, thereby realize the time delay adjustment of radio frequency reception channel in the base station.
Because detectable signal is an existing signal in the LTE system; All the time sending under the normal condition, so the embodiment of the invention need not increase extra correction sequence, the expense of minimizing resource; When not having idle sub-carrier, also can carry out the time delay adjustment of receive path.
In addition; In the LTE system; Itself just need utilize user's detectable signal to come to calculate PDP (Power Delay Profile, power delay spectrum) estimation, so the embodiment of the invention can realize channel correcting through existing PDP computational process through the power delay spectrum algorithm for estimating; Need not introduce additional calculation, thereby practice thrift calculation resources for channel correcting.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do simple the introduction to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of time-delay bearing calibration in the embodiment of the invention;
Fig. 2 is the structural representation of time-delay means for correcting in the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
See also Fig. 1, the embodiment of the invention discloses LTE receive path time-delay bearing calibration, comprise step:
S11, receive a plurality of users' uplink detection signal through a plurality of antennas.
In the LET system, each user can send up detection (sounding) signal, and the base station can obtain each user's detectable signal, and detectable signal is an existing signal in the LTE system, under normal circumstances is sending all the time.The base station of applying closed loop mimo system can receive a plurality of users' uplink detection signal through the antenna sets that is formed by a plurality of antennas.
S12, in a plurality of users, select a user,, adopt the power delay spectrum algorithm for estimating to obtain to set the power delay spectrum of user at each receive path according to setting the user uplink detectable signal for setting the user.
In the embodiment of the present invention, when selecting to set the user, can in a plurality of users, user of person be the setting user.
Concrete, obtain to set the user and can comprise at the power delay spectrum of each receive path:
At first, with setting the reception burst S that all antennas received in uplink detection signal sequence X that the user sends and the antenna sets
kCarry out conjugate multiplication, obtain conjugate multiplication sequence Y
k, wherein sequence X, sequence S
kWith sequence Y
kSequence length be N, k representes the sequence number of antenna, said antenna add up to K; Its computing formula can be as follows:
Then, can pass through conjugate multiplication sequence Y
kDo inverse fourier transform, obtain power time delay spectral sequence Z
nIts computing formula can be as follows:
Z
n＝IFFT(Y
k)
Said sequence Z
nBe power delay spectrum.
In embodiments of the present invention, inverse fourier transform also can be replaced by Fast Fourier Transform Inverse.
S13, obtain the time delay value of each receive path respectively according to the power delay spectrum of each receive path.The time delay value that obtains each receive path specifically can comprise:
According to the maximum place time point of power delay spectrum, confirm time delay value.
For example with sequence Y
k0 place time point be starting point, maximum place time point that can be through power delay spectrum confirmed time delay value.Specifically can be to be the time delay value of this receive path with the place of the maximum in the power delay spectrum of each receive path time point;
Concrete, the maximum of obtaining power delay spectrum can draw through following computing formula:
p
n＝arg?max(S
n(i))，i＝0，1，...，N-1。
Wherein, p
nBe the maximum place time point of power delay spectrum, arg max representes to calculate the parameter with maximum scores.
Preferably, in order to improve the accuracy of time delay value, in embodiments of the present invention, and can also be to each receive path, get repeatedly the maximum place time point in the power delay spectrum, be the time delay value of this receive path with the mean value of maximum place time point repeatedly.
S14, according to the time delay value of each receive path, respectively each receive path is carried out the time delay adjustment.
Behind the time delay value that obtains each receive path, can carry out the time delay adjustment to each receive path respectively according to the time delay value of each receive path, specifically can comprise:
In a plurality of receive paths, selecting a for example optional receive path is the benchmark receive path; Difference according to the time delay value of said benchmark receive path and other receive paths obtains the time delay adjustment amount, according to said time delay adjustment amount other receive paths is carried out the time delay adjustment.
Behind the selection reference receive path, the time delay value of establishing the benchmark receive path is p in a plurality of receive paths
j, can be with the time delay value p separately of other receive paths except that the benchmark receive path
nRespectively with the time delay value p of benchmark receive path
jCarry out difference and calculate, obtain each other receive path respectively separately with respect to the time delay difference DELTA of benchmark receive path
n, concrete formula can be following:
Δ
n＝p
n-p
j，n＝0，1，...，N；
In addition, in embodiments of the present invention, also can be with all receive paths time delay value p separately
nRespectively with the time delay value p of benchmark receive path
jCarry out difference and calculate, obtain each receive path respectively separately with respect to the time delay difference DELTA of benchmark receive path
n, concrete formula can be equally:
Δ
n＝p
n-p
j，n＝0，1，...，N；
Wherein, the time delay difference DELTA of benchmark receive path
j, after bringing above-mentioned formula into and calculating, Δ
j=p
j-p
j, obtain Δ
j=0, so the time delay difference of benchmark receive path is 0.
In embodiments of the present invention, when each receive path being carried out the time delay adjustment, specifically can be time delay difference DELTA according to each receive path
nCarry out the time delay adjustment respectively; Such as, if the sample rate of this moment is f, then the time delay adjustment amount Δ t of each receive path can obtain through following formula:
Wherein, if Δ
nGreater than 0, then be equivalent to increase channel time delay; If Δ
nLess than 0, then be equivalent to reduce channel time delay.
After above-mentioned time delay adjustment, make the time delay value of all receive paths and benchmark receive path obtain unification, thereby realized time delay adjustment receive path.
In sum; In embodiments of the present invention; Utilized the user's who in the LTE system, just exists detectable signal itself; Adopt the power delay spectrum algorithm for estimating to obtain this characteristic of power delay spectrum, draw through can obtaining the time delay adjustment amount according to said power delay spectrum then, thereby realize the time delay adjustment of radio frequency reception channel in the base station.
Because detectable signal is an existing signal in the LTE system; All the time sending under the normal condition, so the embodiment of the invention need not increase extra correction sequence, the expense of minimizing resource; When not having idle sub-carrier, also can carry out the time delay adjustment of receive path.
In addition; In the LTE system; Itself just need utilize user's detectable signal to come to calculate the PDP estimation through the power delay spectrum algorithm for estimating; Therefore the embodiment of the invention can realize channel correcting through existing PDP computational process, need not introduce additional calculation for channel correcting, thereby practice thrift calculation resources.
In addition, referring to Fig. 2, the embodiment of the invention also provides a kind of LTE receive path time-delay means for correcting, and comprising: antenna sets 1, power delay spectrum acquiring unit 2, time delay value obtain unit 3 and time delay adjustment unit 4;
Antenna sets 1 is used to receive a plurality of users' uplink detection signal; In practical application, the base station of applying closed loop mimo system can receive a plurality of users' uplink detection signal through the antenna sets that is formed by a plurality of antennas.In the LET system, each user can send up detectable signal, and the base station can obtain each user's detectable signal, and detectable signal is an existing signal in the LTE system, under normal circumstances is sending all the time.
Power delay spectrum acquiring unit 2; Be used to receive a plurality of users' that a plurality of antennas receive uplink detection signal; In a plurality of users, select a user for setting the user, obtain to set the power delay spectrum of user at each receive path according to the uplink detection signal of setting the user;
Concrete, power delay spectrum estimates to calculate the unit can comprise conjugate multiplication subelement and varitron unit; Wherein
The conjugate multiplication subelement is used for the uplink detection signal sequence X of said setting user transmission and the reception burst S of all said antennas
kCarry out conjugate multiplication, obtain conjugate multiplication sequence Y
k, wherein sequence X, sequence S
kWith sequence Y
kSequence length be N, k representes the sequence number of antenna, said antenna add up to K; Its computing formula can be as follows:
The varitron unit is used for conjugate multiplication sequence Y
kDo inverse fourier transform or inverse fast fourier transform, obtain power time delay spectral sequence Z
nWherein, the inverse fourier transform computing formula can be as follows:
Z
n＝IFFT(Y
k)
Said sequence Z
nBe power delay spectrum.
Time delay value obtains unit 3, is used for obtaining respectively according to the power delay spectrum of each receive path the time delay value of each receive path;
Concrete, time delay value obtains unit 3, can be time delay value with the maximum place time point of the power delay spectrum of each receive path;
Concrete, the maximum of obtaining power delay spectrum can draw through following computing formula:
p
n＝arg?max(S
n(i))，i＝0，1，...，N-1。
Wherein, p
nBe the maximum place time point of power delay spectrum, arg max representes to calculate the parameter with maximum scores.
Preferably, in order to improve the accuracy of time delay value, in embodiments of the present invention; Time delay value obtains the unit; Can also get repeatedly the maximum place time point in the power delay spectrum to each receive path, then, get time delay value for this receive path with the mean value of maximum place time point repeatedly.
Time delay adjustment unit 4 is used for the time delay value according to each receive path, respectively each receive path is carried out the time delay adjustment.
Concrete, time delay adjustment unit 4 can comprise that the time delay adjustment amount obtains subelement and adjustment subelement;
The time delay adjustment amount obtains subelement, and being used at the optional receive path of a plurality of receive paths is the benchmark receive path, according to the difference acquisition time delay adjustment amount of the time delay value of said benchmark receive path and other receive paths;
Behind the time delay value that obtains each receive path, can carry out the time delay adjustment to each receive path respectively according to the time delay value of each receive path, specifically can comprise:
Optional receive path is the benchmark receive path in a plurality of receive paths; Difference according to the time delay value of said benchmark receive path and other receive paths obtains the time delay adjustment amount, according to said time delay adjustment amount said other receive paths is carried out the time delay adjustment.
Behind the selection reference receive path, the time delay value of establishing the benchmark receive path is p in a plurality of receive paths
j, can be with the time delay value p separately of other receive paths except that the benchmark receive path
nRespectively with the time delay value p of benchmark receive path
jCarry out difference and calculate, obtain each other receive path respectively separately with respect to the time delay difference DELTA of benchmark receive path
n, concrete formula can be following:
Δ
n＝p
n-p
j，n＝0，1，...，N；
In addition, in embodiments of the present invention, also can be with all receive paths time delay value p separately
nRespectively with the time delay value p of benchmark receive path
jCarry out difference and calculate, obtain each receive path respectively separately with respect to the time delay difference DELTA of benchmark receive path
n, concrete formula can be equally:
Δ
n＝p
n-p
j，n＝0，1，...，N；
Wherein, the time delay difference DELTA of benchmark receive path
j, after bringing above-mentioned formula into and calculating, Δ
j=p
j-p
j, obtain Δ
j=0, so the time delay difference of benchmark receive path is 0.
The adjustment subelement is used for according to said time delay adjustment amount said other receive paths being carried out the time delay adjustment.
In embodiments of the present invention, when each receive path being carried out the time delay adjustment, specifically can be time delay difference DELTA according to each receive path through the adjustment subelement
nCarry out the time delay adjustment respectively; Such as, if the sample rate of this moment is f, then the time delay adjustment amount Δ t of each receive path can obtain through following formula:
Wherein, if Δ
nGreater than 0, then be equivalent to increase channel time delay; If Δ
nLess than 0, then be equivalent to reduce channel time delay.
After above-mentioned time delay adjustment, make the time delay value of all receive paths and benchmark receive path obtain unification, thereby realized time delay adjustment receive path.
In sum; In embodiments of the present invention; Utilized the user's who in the LTE system, just exists detectable signal itself; Adopt the power delay spectrum algorithm for estimating to obtain this characteristic of power delay spectrum, draw through can obtaining the time delay adjustment amount according to said power delay spectrum then, thereby realize the time delay adjustment of radio frequency reception channel in the base station.
Because detectable signal is an existing signal in the LTE system; All the time sending under the normal condition, so the embodiment of the invention need not increase extra correction sequence, so can be in prior art; Owing to need utilize idle sub-carrier to send specific known signal; Thereby, when not having idle sub-carrier, can make technical scheme of the prior art to use when system loading is bigger.
In addition; In the LTE system; Itself just need utilize user's detectable signal to come to calculate the PDP estimation through the power delay spectrum algorithm for estimating; Therefore the present invention realizes channel correcting through multiplexing existing computational process, need not introduce additional calculation for channel correcting, thereby practice thrift calculation resources.
In addition, the embodiment of the invention also provides a kind of base station, comprise as Fig. 2 the time-delay means for correcting among the corresponding embodiment.
Because in the present embodiment time-delay means for correcting, its structure with as Fig. 2 the time-delay means for correcting among the corresponding embodiment similar, the technical problem of its solution is similar with the technique effect of obtaining, so just repeat no more at this.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the embodiment disclosed method, so description is fairly simple, relevant part is partly explained referring to method and is got final product.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (12)
1. a LTE receive path time-delay bearing calibration is characterized in that, comprising:
Receive a plurality of users' uplink detection signal through a plurality of antennas;
In said a plurality of users, select a user for setting the user, according to the said power delay spectrum of setting user's the said setting of uplink detection signal acquisition user at each receive path;
Obtain the time delay value of each receive path respectively according to the power delay spectrum of each receive path;
According to the time delay value of each receive path, respectively each receive path is carried out the time delay adjustment.
2. according to the said time-delay bearing calibration of claim 1, it is characterized in that said uplink detection signal according to said setting user obtains said setting user and comprises at the power delay spectrum of each receive path:
According to said setting user's uplink detection signal, adopt the power delay spectrum algorithm for estimating to obtain the power delay spectrum of said setting user at each receive path.
3. according to the said time-delay bearing calibration of claim 1, it is characterized in that said uplink detection signal according to said setting user adopts the power delay spectrum algorithm for estimating to obtain the power delay spectrum of said setting user at each receive path, comprising:
With the uplink detection signal sequence X of this user's transmission and the reception burst S of said a plurality of antennas
kCarry out conjugate multiplication, obtain conjugate multiplication sequence Y
k, wherein sequence X, sequence S
kWith sequence Y
kSequence length be N, k representes the sequence number of antenna, said a plurality of antennas add up to K;
To conjugate multiplication sequence Y
kDo inverse fourier transform or inverse fast fourier transform, obtain power time delay spectral sequence Z
n
4. according to the said time-delay bearing calibration of claim 1, it is characterized in that,
The time delay value that said power delay spectrum according to each receive path obtains each receive path respectively comprises:
According to the maximum place time point of said power delay spectrum, confirm the time delay value of each receive path.
5. according to the said time-delay bearing calibration of claim 1, it is characterized in that,
Said time delay value according to each receive path, carry out the time delay adjustment to each receive path respectively and comprise:
Optional receive path is the benchmark receive path in a plurality of receive paths, obtains the time delay adjustment amount according to the difference of the time delay value of said benchmark receive path and other receive paths, according to said time delay adjustment amount other receive paths is carried out time delay adjustment.
6. according to the said time-delay bearing calibration of claim 4, it is characterized in that said maximum according to said power delay spectrum belongs to time point, confirms the time delay value of each receive path; Comprise:
With the place of the maximum in the power delay spectrum of each receive path time point is the time delay value of this receive path; Or, to each receive path, get repeatedly the maximum place time point in the said power delay spectrum, be the time delay value of this receive path with the mean value of said maximum place time point repeatedly.
7. a LTE receive path time-delay means for correcting is characterized in that, comprising:
Antenna sets is used to receive a plurality of users' uplink detection signal;
The power delay spectrum acquiring unit; Be used to receive a plurality of users' that a plurality of antennas receive uplink detection signal; In said a plurality of users, select a user for setting the user, according to the said power delay spectrum of setting user's the said setting of uplink detection signal acquisition user at each receive path;
Time delay value obtains the unit, is used for obtaining respectively according to the power delay spectrum of each receive path the time delay value of each receive path;
The time delay adjustment unit is used for the time delay value according to each receive path, respectively each receive path is carried out the time delay adjustment.
8. according to the said time-delay means for correcting of claim 7, it is characterized in that said power delay spectrum acquiring unit comprises:
Power delay spectrum estimator unit is used to adopt the power delay spectrum algorithm for estimating to obtain the power delay spectrum of said setting user at each receive path.
9. according to the said time-delay means for correcting of claim 7, it is characterized in that said power delay spectrum acquiring unit comprises:
The conjugate multiplication subelement is used for the uplink detection signal sequence X of said setting user transmission and the reception burst S of all said antennas
kCarry out conjugate multiplication, obtain conjugate multiplication sequence Y
k, wherein sequence X, sequence S
kWith sequence Y
kSequence length be N, k representes the sequence number of antenna, said antenna add up to K;
The varitron unit is used for conjugate multiplication sequence Y
kDo inverse fourier transform or inverse fast fourier transform, obtain power time delay spectral sequence Z
n
10. according to the said time-delay means for correcting of claim 9, it is characterized in that the time delay adjustment unit comprises:
The time delay adjustment amount obtains subelement, and being used at the optional receive path of a plurality of receive paths is the benchmark receive path, according to the difference acquisition time delay adjustment amount of the time delay value of said benchmark receive path and other receive paths;
The adjustment subelement is used for according to said time delay adjustment amount said other receive paths being carried out the time delay adjustment.
11., it is characterized in that said time delay value obtains the unit according to the said time-delay means for correcting of claim 10, be used for obtaining the maximum place time point of the power delay spectrum of each receive path, and be the time delay value of this receive path with this time point; Perhaps,, get repeatedly the maximum place time point in the said power delay spectrum, and be the time delay value of this receive path with the mean value of maximum place time point repeatedly to each receive path.
12. a base station is characterized in that, comprises like each said time-delay means for correcting among the claim 7-11.
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| CN108365997A (en) * | 2017-01-26 | 2018-08-03 | 华为技术有限公司 | A kind of information transferring method and device |
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| CN110299951B (en) * | 2018-03-23 | 2022-04-22 | 中兴通讯股份有限公司 | Phase calibration method and device |
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| CN115080469A (en) * | 2022-05-13 | 2022-09-20 | 珠海全志科技股份有限公司 | Memory transmission delay calibration method and device |
| CN115967966A (en) * | 2023-03-17 | 2023-04-14 | 深圳国人无线通信有限公司 | Relay coverage system and multi-channel time delay balancing method thereof |
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