CN102324944B - Antenna calibration method and device - Google Patents
Antenna calibration method and device Download PDFInfo
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- CN102324944B CN102324944B CN201110161061.2A CN201110161061A CN102324944B CN 102324944 B CN102324944 B CN 102324944B CN 201110161061 A CN201110161061 A CN 201110161061A CN 102324944 B CN102324944 B CN 102324944B
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Abstract
The invention discloses an antenna calibration method and an antenna calibration device, and relates to a communication technology. The method comprises the following steps of: selecting a frequency point with the lowest interference to perform antenna calibration from each frequency point of the same RRU (Remote Radio Unit) in a set bandwidth; transmitting the calibration result to other frequency points of the same RRU in the set bandwidth; and compensating according to the calibration result after the calibration result is received by each frequency point. Since amplitude difference and phase difference are extremely small between channels of each frequency point of the same RRU in a certain bandwidth range, each frequency point is compensated according to the calibration result of the frequency point with the lowest interference; and thus, the influence of the interference on the antenna calibration can be reduced, and the accuracy for the antenna calibration can be improved.
Description
Technical field
The present invention relates to the communication technology, relate in particular to a kind of antenna calibration method, system and device.
Background technology
At TD-SCDMA(3G (Third Generation) Moblie) in system, the prerequisite that realizes smart antenna is the consistency that keeps each antenna amplitude and phase place.In existing network, outdoor intelligent antenna is generally configured to S333(S333 and represents 3 smart antenna sectors, 3 of each sectors frequency) or S666(S666 represent 3 smart antenna sectors, 6 of each sectors frequency), each sector connects a broadband multichannel RRU(Remote Radio Unit, remote radio unit (RRU)).But different frequent points is subject to external interference magnitude difference, in serious situation, the precision of calibration will be had influence on.
Concrete, in network, the smart antenna work of a sector is N frequency at present, the N is here generally 3 or 6, calibrates and compensates according to calibration result respectively at receive/transmitting antenna of each frequency.
For multifrequency point calibration, prior art scheme as shown in Figure 1, also independently calibrate simultaneously, compensate respectively according to calibration result by each frequency.Because the interference level of each frequency in network differs greatly, in the time of serious interference, the antenna calibration result of some frequency will can not meet its precision, and the frequency that does not meet calibration accuracy is by impact broadcast and user's figuration, meanwhile, the frequency that does not meet calibration accuracy is in severe case also for the optimization of network brings difficulty.
Summary of the invention
The embodiment of the present invention provides a kind of antenna calibration method and device, to reduce to disturb the impact on antenna calibration.
A kind of antenna calibration method, comprising:
Determine in predefined bandwidth range and disturb minimum frequency in each frequency;
In the time that calibration cycle arrives, the frequency minimum to described interference carries out antenna calibration, and obtains calibration result;
According to described calibration result, each frequency in the bandwidth range of setting is compensated;
In described definite predefined bandwidth range, in each frequency, disturb minimum frequency, specifically comprise:
In the time that the Interference Detection cycle arrives, the each frequency in bandwidth range is carried out to Interference Detection, obtain interference value;
The interference value of more each frequency, the frequency of determining interference value minimum is to disturb minimum frequency;
Or, in described definite predefined bandwidth range, in each frequency, disturb minimum frequency, specifically comprise:
In the time that the Interference Detection cycle arrives, the each frequency in bandwidth range is carried out to Interference Detection, obtain interference value;
According to the interference value of each frequency of measuring at least 2 times recently, determine the average interference value of each frequency;
The average interference value of more each frequency, the frequency of determining average interference value minimum is to disturb minimum frequency.
Corresponding a kind of antenna calibration device, comprising:
Determining unit, in the time that the Interference Detection cycle arrives, carries out Interference Detection to the each frequency in bandwidth range, obtains interference value; The interference value of more each frequency, the frequency of determining interference value minimum is to disturb minimum frequency; Or, in the time that the Interference Detection cycle arrives, the each frequency in bandwidth range being carried out to Interference Detection, obtain interference value; According to the interference value of each frequency of measuring at least 2 times recently, determine the average interference value of each frequency; The average interference value of more each frequency, the frequency of determining average interference value minimum is to disturb minimum frequency;
Alignment unit, in the time that calibration cycle arrives, the frequency minimum to described interference carries out antenna calibration, and obtains calibration result;
Compensating unit, for compensating each frequency in the bandwidth range of setting according to described calibration result.
The embodiment of the present invention provides a kind of antenna calibration method and device, setting in each frequency of same RRU in bandwidth, select and disturb minimum frequency to carry out antenna calibration, and calibration result is sent to other frequency of setting same RRU in bandwidth, each frequency is receiving after calibration result, compensates according to this calibration result.Due in certain bandwidth range, between the passage of each frequency of same RRU, amplitude difference and phase difference are very little, so each frequency all compensates according to the calibration result of disturbing minimum frequency, can reduce to disturb the impact on antenna calibration, improve the accuracy of antenna calibration.
Accompanying drawing explanation
Fig. 1 is antenna calibration method schematic diagram of the prior art;
Fig. 2 is antenna calibration method flow chart in the embodiment of the present invention;
Fig. 3 determines in predefined bandwidth range and disturbs one of method flow diagram of minimum frequency in each frequency in the embodiment of the present invention;
Fig. 4 be in the embodiment of the present invention, determine in each frequency, disturb in predefined bandwidth range minimum frequency method flow diagram two;
Fig. 5 is antenna calibration apparatus structure schematic diagram in the embodiment of the present invention.
Embodiment
The embodiment of the present invention provides a kind of antenna calibration method and device, setting in each frequency of same RRU in bandwidth, select and disturb minimum frequency to carry out antenna calibration, and calibration result is sent to other frequency of setting same RRU in bandwidth, each frequency is receiving after calibration result, compensates according to this calibration result.Due in certain bandwidth range, between the passage of each frequency of same RRU, amplitude difference and phase difference are very little, so each frequency all compensates according to the calibration result of disturbing minimum frequency, can reduce to disturb the impact on antenna calibration, improve the accuracy of antenna calibration.
As shown in Figure 2, the antenna calibration method that the embodiment of the present invention provides, comprising:
Step S201, determine in predefined bandwidth range and disturb minimum frequency in each frequency;
Step S202, in the time that calibration cycle arrives, to disturbing minimum frequency to carry out antenna calibration, and obtain calibration result;
Step S203, according to calibration result to set bandwidth range in each frequency compensate.
Owing to being antenna calibration to disturbing minimum frequency to carry out, so disturb less on the impact of calibration result, and in predefined bandwidth range, amplitude difference and the phase difference of each frequency are very little again, so by this antenna calibration method, can effectively reduce to disturb the impact on calibration result; Meanwhile, owing to only a frequency in bandwidth range being calibrated, so also reduced calibration power, reduced the impact of calibrating signal on system.
Conventionally, setting when bandwidth range, need to make the amplitude difference of each frequency in bandwidth range and phase difference in allowed band.For example, in TD-SCDMA system, the bandwidth of each frequency is 1.6MHz, experiment finds that interior each frequency of same RRU of continuous 1.6 × 3=4.8MHz bandwidth measured interchannel amplitude difference and phase difference are all very little, so, if bandwidth range is set as to 4.8MHz, because amplitude difference and the phase difference of 3 frequencies in bandwidth range are very little, can share one group of calibration result.If amplitude difference and the phase difference that can tolerate are larger, that bandwidth range can be set is slightly large, and then can further reduce to calibrate power.
For example, when in the time that a RRU comprises 6 frequencies, the antenna calibration method providing by the embodiment of the present invention is calibrated, can based on experience value 6 frequencies be divided into two groups, 3 frequencies in every group are positioned at same bandwidth range, i.e. the first frequency, the second frequency and the 3rd frequency are positioned at the first bandwidth range, the 4th frequency, the 5th frequency and the 6th frequency are positioned at the second bandwidth range, can be from the first frequency in the first bandwidth range, in the second frequency and the 3rd frequency, select and disturb minimum frequency, from the 4th frequency in the second bandwidth range, in the 5th frequency and the 6th frequency, select and disturb minimum frequency, if the frequency of selected interference minimum is respectively the 3rd frequency and the 4th frequency, can calibrate the 3rd frequency and the 4th frequency respectively, and according to the calibration result of the 3rd frequency to the first frequency in the first bandwidth range, the second frequency and the 3rd frequency compensate, according to the calibration result of the 4th frequency to the 4th frequency in the second bandwidth range, the 5th frequency and the 6th frequency compensate.
Like this, supposing that the suffered interference of the 6th frequency is very strong, in the time that the 6th frequency is calibrated, is the calibration result of the 4th frequency due to what use so, so the calibration of the 6th frequency is no longer subject to the impact of its interference, has improved the precision of calibration.
As shown in Figure 3, in step S201, determine in predefined bandwidth range and disturb minimum frequency in each frequency, specifically comprise:
Step S301, in the time that the Interference Detection cycle arrives, the each frequency in bandwidth range is carried out to Interference Detection, obtain interference value;
The interference value of step S302, more each frequency, the frequency of determining interference value minimum is to disturb minimum frequency.
Now, it is better that the Interference Detection cycle is less than or equal to calibration cycle, thereby be convenient to obtain nearer disturbed condition in the time of calibration, and the frequency of definite interference value minimum.
Further, disturb minimum frequency in order to determine more accurately, avoid instantaneous disturbance to determining that result impacts, can obtain average interference value by Interference Detection repeatedly, and determine and disturb minimum frequency by average interference value, concrete, as shown in Figure 4, step S201 specifically comprises:
Step S401, in the time that the Interference Detection cycle arrives, the each frequency in bandwidth range is carried out to Interference Detection, obtain interference value;
Step S402, according to the interference value of each frequency of measuring at least 2 times recently, determine the average interference value of each frequency;
The average interference value of step S403, more each frequency, the frequency of determining average interference value minimum is to disturb minimum frequency.
Conventionally be that the interference value that detects in current calibration cycle is better for calculating the interference value of average interference value, so that calibration cycle is 2 times of Interference Detection cycle is better above.
Wherein, carry out Interference Detection and obtain interference value carrying out in the following way: obtain the data that each antenna receives at current frequency under the condition of transmitted signal not; The interference value of determining this frequency is the mean value of each data of arriving of each antenna reception.
In the specific implementation, can utilize receive direction antenna calibration device to carry out Interference Detection, the difference of calibrating and carry out Interference Detection is, the amplitude of the calibration channel that while carrying out Interference Detection, calibrated channel sends is 0, and the transmitted signal of calibrated channel is data
cal=A
c× S
cal, wherein data
calthe transmission data of calibrated channel while calibration for receive direction; A
cthe transmission amplitude of calibrating power during for N frequency Interference Detection; S
calfor receiving the calibrating sequence in when calibration, when carrying out Interference Detection while arranging, by A
cbe set to 0.
In the time that the calibration amplitude of N frequency Interference Detection alignment passage transmission is 0, can guarantee that the signal that each normal receive path receives is external interference signal.
According to received interference signal, can be for the N frequency in bandwidth range, calculate respectively its interference value ISCP(Interfere Signal Chip Power, Interference Signal Code Power), the interference value calculating is:
Wherein, i is frequency sequence number, represents i frequency in the N frequency in bandwidth range, 1≤i≤N; K is antenna sequence number; M is calibrating sequence sequence number; Rdata(k, m) be illustrated in the data that calibrating position (k, m) is received.
In the time calculating average interference value, can use the iscpi of each measurement to calculate, the average interference value obtaining for M interferometry of i frequency is:
In the time determining minimum average interference value, can be in the following way:
f
cal＝1；
temp＝ISCP
1;
For?kk＝2：N
If（temp＜ISCP
kk）
f
cal＝kk
temp＝ISCP
kk
End
End
The temp value of determining is minimum average interference value, f
calbe the frequency sequence number of average interference value minimum.
The embodiment of the present invention also provides a kind of antenna calibration device, and this antenna calibration device can be specially RRU, and as shown in Figure 5, this antenna calibration device comprises:
Determining unit 501, for determining that in predefined bandwidth range, each frequency disturbs minimum frequency;
Compensating unit 503, for compensating each frequency in the bandwidth range of setting according to calibration result.
Wherein, determining unit 501 specifically for:
In the time that the Interference Detection cycle arrives, the each frequency in bandwidth range is carried out to Interference Detection, obtain interference value;
The interference value of more each frequency, the frequency of determining interference value minimum is to disturb minimum frequency.
Further, when the mean value of the interference value that uses repeatedly Interference Detection to obtain is determined while disturbing minimum frequency, determining unit 501 specifically for:
In the time that the Interference Detection cycle arrives, the each frequency in bandwidth range is carried out to Interference Detection, obtain interference value;
According to the interference value of each frequency of measuring at least 2 times recently, determine the average interference value of each frequency;
The average interference value of more each frequency, the frequency of determining average interference value minimum is to disturb minimum frequency.
Obtain the data that each antenna receives at current frequency under the condition of transmitted signal not;
The interference value of determining this frequency is the mean value of each data of arriving of each antenna reception.
The embodiment of the present invention provides a kind of antenna calibration method and device, setting in each frequency of same RRU in bandwidth, select and disturb minimum frequency to carry out antenna calibration, and calibration result is sent to other frequency of setting same RRU in bandwidth, each frequency is receiving after calibration result, compensates according to this calibration result.Due in certain bandwidth range, between the passage of each frequency of same RRU, amplitude difference and phase difference are very little, so each frequency all compensates according to the calibration result of disturbing minimum frequency, can reduce to disturb the impact on antenna calibration, improve the accuracy of antenna calibration.
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 (6)
1. an antenna calibration method, is characterized in that, comprising:
Determine in each frequency of same remote radio unit (RRU) RRU in predefined bandwidth range and disturb minimum frequency;
In the time that calibration cycle arrives, the frequency minimum to described interference carries out antenna calibration, and obtains calibration result;
According to described calibration result, each frequency of described same RRU in the bandwidth range of setting is compensated;
In described each frequency of determining described same RRU in predefined bandwidth range, disturb minimum frequency, specifically comprise:
In the time that the Interference Detection cycle arrives, the each frequency of described same RRU in bandwidth range is carried out to Interference Detection, obtain interference value;
The interference value of more each frequency, the frequency of determining interference value minimum is to disturb minimum frequency;
Or, in described each frequency of determining described same RRU in predefined bandwidth range, disturb minimum frequency, specifically comprise:
In the time that the Interference Detection cycle arrives to bandwidth range in each frequency of described same RRU carry out Interference Detection, obtain interference value;
According to the interference value of each frequency of measuring at least 2 times recently, determine the average interference value of each frequency;
The average interference value of more each frequency, the frequency of determining average interference value minimum is to disturb minimum frequency.
2. the method for claim 1, is characterized in that, described in the time that the Interference Detection cycle arrives to bandwidth range in each frequency of described same RRU carry out Interference Detection, obtain interference value, specifically comprise:
Obtain the data that each antenna of described same RRU under the condition of transmitted signal not receives at current frequency;
The interference value of determining this frequency is the mean value of each data of arriving of each antenna reception.
3. the method for claim 1, is characterized in that, the described Interference Detection cycle is less than described calibration cycle.
4. the method for claim 1, is characterized in that, in described predefined bandwidth range, same RRU comprises at least 3 frequencies.
5. an antenna calibration device, is characterized in that, comprising:
Determining unit, in the time that the Interference Detection cycle arrives, carries out Interference Detection to the each frequency of same remote radio unit (RRU) RRU in bandwidth range, obtains interference value; The interference value of more each frequency, the frequency of determining interference value minimum is to disturb minimum frequency; Or, in the time that the Interference Detection cycle arrives to bandwidth range in each frequency of described same RRU carry out Interference Detection, obtain interference value; According to the interference value of each frequency of measuring at least 2 times recently, determine the average interference value of each frequency; The average interference value of more each frequency, the frequency of determining average interference value minimum is to disturb minimum frequency;
Alignment unit, in the time that calibration cycle arrives, the frequency minimum to described interference carries out antenna calibration, and obtains calibration result;
Compensating unit, for compensating each frequency of described same RRU in the bandwidth range of setting according to described calibration result.
6. device as claimed in claim 5, is characterized in that, described determining unit in the time that the Interference Detection cycle arrives to bandwidth range in each frequency of described same RRU carry out Interference Detection, obtain interference value, specifically comprise:
Obtain the data that described each antenna of same RRU receives at current frequency under the condition of transmitted signal not;
The interference value of determining this frequency is the mean value of each data of arriving of each antenna reception.
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| WO2020244783A1 (en) * | 2019-06-07 | 2020-12-10 | Telefonaktiebolaget Lm Ericsson (Publ) | Calibration for antenna elements of a multi-antenna structure |
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| CN104378775B (en) * | 2013-08-16 | 2018-01-05 | 普天信息技术研究院有限公司 | The method that passage is calibrated between RRU |
| CN105471454B (en) * | 2014-09-02 | 2019-11-15 | 苏州普源精电科技有限公司 | For the self-correcting equipment of radio-frequency signal source and the correction system of radiofrequency signal |
| CN104811255B (en) * | 2015-04-23 | 2017-06-23 | 大唐移动通信设备有限公司 | A kind of antenna calibration method and device |
| CN106788798B (en) * | 2015-11-23 | 2020-02-21 | ***通信集团公司 | Antenna calibration method and device |
| CN106788788B (en) * | 2016-12-15 | 2020-02-14 | 通号（北京）轨道工业集团有限公司 | Reference ring calibration method and device |
| CN107483375B (en) * | 2017-08-14 | 2019-09-27 | 维沃移动通信有限公司 | Compensation method, signal processing circuit and the mobile terminal of the group delay of signal |
| CN107991658B (en) * | 2017-11-24 | 2020-04-24 | 上海机电工程研究所 | Radial distance calibration method for millimeter wave array antenna |
| CN114189291B (en) * | 2020-09-15 | 2023-12-05 | 北京佰才邦技术股份有限公司 | Antenna calibration method, remote radio unit and baseband processing unit |
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