CN110024304A - Method for correcting phase and device - Google Patents
Method for correcting phase and device Download PDFInfo
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- CN110024304A CN110024304A CN201680091163.2A CN201680091163A CN110024304A CN 110024304 A CN110024304 A CN 110024304A CN 201680091163 A CN201680091163 A CN 201680091163A CN 110024304 A CN110024304 A CN 110024304A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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Abstract
The embodiment of the invention provides a kind of method for correcting phase and devices, carry out quick phasing to RRU by BBU to realize, compensate for the deficiency for correction of eating dishes without rice or wine.The method for correcting phase, comprising: the time delay value that Base Band Unit BBU obtains local clock between the recovered clock of radio frequency unit RRU that receives twice in succession；The Base Band Unit calculates Delay Variation value according to the time delay value twice；Reciprocity difference correction coefficient is calculated according to the Delay Variation value in the Base Band Unit, and carries out phasing using the reciprocity difference correction coefficient sub-carrier.
Description
This application involves wireless communication technique fields, and in particular to a kind of method for correcting phase and device.
Under distributed multiple-input and multiple-output (distributed multiple-input multiple-output, DMIMO) scene, all aerial signals need to focus on.Since the antenna of multiple Remote Radio Unit (Radio Remote Unit, RRU) combines transmitting, the phase response coherence request between each RRU is higher.The method using correction of eating dishes without rice or wine between RRU general at present, correction signal is sent out between RRU mutually periodically to correct the phase response of RRU, the reciprocity between different RRU is made to differ equal, i.e. TX1/RX1=TX2/RX2, TX indicates downlink phase response, and RX indicates uplink UL phase response.Base Band Unit (Baseband Unit, BBU) is usually connected with RRU by zooming out optical fiber, and above-mentioned uplink downlink phase response also includes the time delay influence of optical fiber, and optical-fiber time-delay is more sensitive to temperature.It eats dishes without rice or wine in calibration cycle at one, the optical-fiber time-delay of different RRU may change with factors such as temperature and be changed, the variation of time delay leads to the phase change of RRU, it is fast so as to cause the difference TX/RX variation of different RRU reciprocities, in calibration cycle of eating dishes without rice or wine, the error delta T (i.e. TX1/RX1-TX2/RX2) that reciprocity differs between RRU is caused to increase, it is difficult to meet the requirement of DMIMO.
Summary of the invention
In view of this, carrying out quick phasing the embodiment of the invention provides a kind of method for correcting phase and device to RRU by BBU to realize, compensating for the deficiency for correction of eating dishes without rice or wine.
In a first aspect, providing a kind of method for correcting phase, comprising:
The time delay value that Base Band Unit BBU obtains local clock between the recovered clock of radio frequency unit RRU that receives twice in succession；
The Base Band Unit calculates Delay Variation value according to the time delay value twice；
Reciprocity difference correction coefficient is calculated according to the Delay Variation value in the Base Band Unit, and carries out phasing using the reciprocity difference correction coefficient sub-carrier.
With reference to first aspect, in the first possible implementation, the BBU obtains local clock and the time delay value of the recovered clock of the radio frequency unit RRU received includes:
The BBU is read out the clocking error phase demodulation value in the serializer/de-serializers SerDes of the BBU, modulus and processing obtain the time delay value.
The first possible implementation with reference to first aspect includes: in the second possible implementation that the BBU is averaged or is filtered to the clocking error phase demodulation value in the processing.
With reference to first aspect, in the third possible implementation, it includes: that the local clock and the recovered clock are carried out time delay detection and processing obtains the time delay value by the BBU that the BBU, which obtains the time delay value of the recovered clock of local clock and the radio frequency unit RRU received,.
With reference to first aspect and aforementioned any possible implementation, in the fourth possible implementation, it includes: that according to the RF spot and the Delay Variation value of the subcarrier reciprocity difference correction coefficient is calculated in the BBU that reciprocity difference correction coefficient, which is calculated, according to the Delay Variation value in the Base Band Unit.
Second aspect, provides a kind of phase correction unit, and described device includes: Delay Variation value acquiring unit and sub-carrier phase compensating unit；
The Delay Variation value acquiring unit, the time delay value between recovered clock for obtaining the radio frequency unit RRU that Base Band Unit BBU local clock and the BBU are received twice in succession, and Delay Variation value is calculated according to the time delay value twice；
The sub-carrier phase compensating unit for reciprocity difference correction coefficient to be calculated according to the Delay Variation value, and carries out phasing using the reciprocity difference correction coefficient sub-carrier.
In conjunction with second aspect, in the first possible implementation, the time delay value that the Delay Variation value acquiring unit is used to obtain between the recovered clock for the radio frequency unit RRU that the BBU local clock and the BBU are received includes:
The Delay Variation value acquiring unit is read out for the clocking error phase demodulation value in the serializer/de-serializers SerDes to the BBU, modulus and processing obtain the time delay value.
The first possible implementation in conjunction with second aspect, in the second possible implementation, the processing includes: that the Delay Variation value acquiring unit is averaged or is filtered to the clocking error phase demodulation value.
The first possible implementation in conjunction with second aspect, in the third possible implementation, the time delay value that the Delay Variation value acquiring unit is used to obtain between the recovered clock for the radio frequency unit RRU that the BBU local clock and the BBU are received includes:
The Delay Variation value acquiring unit, for the local clock and recovered clock progress time delay detection and processing to be obtained the time delay value.
In conjunction with second aspect and aforementioned any possible implementation, in the fourth possible implementation, the sub-carrier phase compensating unit, it include: the sub-carrier phase compensating unit for reciprocity difference correction coefficient to be calculated according to the Delay Variation value, for the reciprocity difference correction coefficient to be calculated according to the RF spot and the Delay Variation value of the subcarrier.
Various embodiments of the present invention compensate for the deficiency for correction of eating dishes without rice or wine, meet requirement of the DMIMO to different RRU reciprocities difference consistency by carrying out quick phasing to RRU by BBU.
Fig. 1 is a kind of method for correcting phase flow chart provided in an embodiment of the present invention；
Fig. 2 is a kind of phase correction scheme schematic diagram provided in an embodiment of the present invention；
Fig. 3 is that a kind of phase correction scheme system provided in an embodiment of the present invention realizes structural block diagram；
Fig. 4 is a kind of SerDes structural block diagram provided in an embodiment of the present invention；
Fig. 5 is that another phase correction scheme system provided in an embodiment of the present invention realizes structural block diagram；
Fig. 6 is a kind of phase correction unit structural block diagram provided in an embodiment of the present invention.
For the purpose, technical solution and advantage of the application is more clearly understood, with reference to the accompanying drawings and examples, technical solution provided by the present application is described in further detail.
As shown in Figure 1, the embodiment of the present invention provides a kind of method for correcting phase, comprising:
The time delay value that step 101, Base Band Unit BBU obtain local clock between the recovered clock of radio frequency unit RRU that receives twice in succession.
Optionally, which can be the value after modulus.
Optionally, the BBU is read out the clocking error phase demodulation value in the serializer/de-serializers (serializer/deserializer, SerDes) of the BBU, modulus and processing obtain the time delay value.The clocking error phase demodulation value read can be the value after modulus.The modulus refers to that the clocking error phase demodulation value read carries out modulus calculating.The processing, which can be, to be averaged or is filtered to the clocking error phase demodulation value after the modulus.
For example, reading, modulus and processing can be following process: BBU continuously reads 1000 clocking error phase demodulation value Phi_e in 5ms by 5 microsecond periodics.Modulus calculating is carried out to all data read, i.e., carries out range judgement first, then value transboundary is handled according to data area.After modulo operation, 1000 obtained numbers are averaged or are filtered, the influence of possible noise and interference is filtered out.
Above-mentioned modulus is exemplified below:
1. reading the PI Code value (Phi_e) of the SERDES output of baseband board first, which is mould with 128, from 0~127；Here the 1 of PI Code value corresponds to a fixed duration, such as 1ps, 2ps etc..PI Code value is obtained after processing is converted into time delay value.
2. can not be very big based on 1000 clocking error phase demodulation value differences are read in short time 5ms, if in the number read while having smaller value [0,20] and the larger value [110,127], illustrate that the modulo operation for needing to do is as follows with being transboundary worth:
If in the 2.1 1000 several x read: there is no minimum values less than 20, and maximum value is greater than 110, i.e., all data are in A scene: in [21,127], or in B scene: in [0,109], then counting
It is constant according to x
If there are minimum values less than 20 in the 2.2 1000 several x read, and maximum value is greater than 110, i.e. C scene: existing data also have in data [110,127] in [0,20], then may determine that the inside exists and be transboundary worth；Treating method: this to it is all be greater than 110 data x, take x=x-128.
Alternatively, the local clock and the recovered clock are carried out time delay detection to the BBU and processing obtains the time delay value.The time delay value detected can be to the value after practical time delay value modulus.BBU can also carry out modulus according to delay data range with repeated detection time delay, carry out that mean value or filtering etc. is taken to handle to multiple values after the modulus of acquisition, to obtain the time delay value.
Step 102, the Base Band Unit calculate Delay Variation value according to the time delay value twice.
Delay Variation value calculated example is as follows:
The above-mentioned time delay value obtained twice is T1, T2 respectively, which may be the value after modulus, and according to mentioned-above model taking method, the value of T1, T2 may be negative value, it is assumed that in the range of [- 18,127], it is assumed that its mould is 128；The time difference very little of time delay is obtained based on test twice, it is assumed that delay inequality variation is less than 20 in the testing time twice；Calculation delay difference Δ T accordingly:
The time delay value obtained as previously described, the value of i.e. average or filtered code_avg is [- 18,127] between, the value of actually [- 18, -1] is equivalent to [110,127], for example numerical value is respectively -10 and 120 twice, then practical respective value should be converted to 118 and 120, and time delay difference should be 120-118=2, rather than 120- (- 10)=130；
Assuming that the Value Data of time delay twice obtained is respectively code_avg0 and code_avg1, delta_code_avg=code_avg1-code_avg0, the equal value difference of time delay actually required is needed to delta_code_avg modulus, it is defined as " delta_code_avg_ modulus ", the processing mode is as follows: if (1) abs (delta_code_avg)≤20, delta_code_avg_ modulus=delta_code_avg；(2) if delta_code_avg < -20, delta_code_avg_ modulus=delta_code_avg+128；(3) if delta_code_avg > 20, delta_code_avg_ modulus=delta_code_avg-128；
The problem of data are transboundary obscured is avoided in this way.
Reciprocity difference correction is calculated according to the Delay Variation value in step 103, the Base Band Unit
Coefficient, and phasing is carried out using the reciprocity difference correction coefficient sub-carrier.
Optionally, the Base Band Unit is calculated reciprocity difference correction coefficient according to the Delay Variation value and includes:
The reciprocity difference correction coefficient is calculated according to the RF spot and the Delay Variation value of the subcarrier in the BBU.
In above-described embodiment, quick phasing is carried out to RRU by BBU, compensates for the deficiency for correction of eating dishes without rice or wine, meets requirement of the DMIMO to different RRU reciprocities difference consistency.
Optionally, before step 103, the operations such as the BBU can be filtered the Delay Variation value, to filter out clock jitter.
Optionally, above-mentioned correction can be periodically, such as 400ms, or according to other preset periods of system actual working environment.
Correction of eating dishes without rice or wine in the prior art is carried out between RRU, and calibration cycle is longer, such as 20s, it is difficult to eliminate the influence of the environmental changes bring Delay Variation such as temperature.In the embodiment of the present invention, it can be superimposed period shorter self-correcting on the basis of eating dishes without rice or wine correction in the period, such as the period can be 400ms, as shown in Figure 2.The program can differ the reciprocity in the channel RRU and carry out quick self-correcting, eliminate influence of the environmental change to time delay.
Below with reference to a kind of illustrative system structure diagram, scheme provided in an embodiment of the present invention is described further.It should be noted that following the description is only a kind of implementation of the invention.
As shown in figure 3, phase correction block obtains recovered clock RCLK, the clocking error phase demodulation value Phi-e of local clock LCLK, SerDes of SerDes input, the Delay Variation value of RCLK and LCLK is obtained by Delay Variation value acquiring unit, the processing such as is filtered；Subcarrier reciprocity difference correction coefficient is calculated according to the Delay Variation value in sub-carrier phase compensating unit, and is corrected using reciprocity difference correction coefficient to the sub-carrier phase.
Wherein, flexibly setting can be actually needed in the input signal of Delay Variation value acquiring unit according to system, such as can be there are two input signal: TCLK and RCLK, can also be there are three input signal: TCLK, RCLK and Phi-e be also possible to an input signal Phi-e.
Wherein, the SerDes structure in BBU is as shown in Figure 4.
It should be noted that there are many forms by clocking error phase demodulation value Phi-e, it illustrates the phase difference of LCLK and RCLK in Fig. 4 phase discriminator.Phase difference or time delay after usually practical modulus.
Specifically, the clock downlink delay from BBU to RRU is Td, i.e. A point to B point in Fig. 3；Clock uplink time delay from RRU to BBU is Tu, i.e. B point to C point.Then the time delay value between LCLK and RCLK is T=Td+Tu.In a certain period of time t, the changing value Δ T of T has just reacted the changing value of uplink and downlink clock chain circuit overall delay.Assuming that uplink and downlink clock chain circuit Delay Variation value is equal, then unidirectional clock chain circuit Delay Variation value Δ Td=Δ Tu=1/2* Δ T.
And Δ Td directly has an impact the phase drift of RF local oscillator, the purpose of the embodiment of the present invention is that Δ Td compensation is fallen.
Delay inequality changing value acquiring unit obtains the primary data information (pdi) in the Delay Variation value Δ T between the LCLK and RCLK in a time cycle t, such as interval time t measures the time delay between LCLK and RCLK twice, and Delay Variation value Δ T is calculated, it the processing such as can also be filtered to the primary data information (pdi) of Δ T；
Sub-carrier phase compensating unit calculates unidirectional downlink time delay Δ Td according to Δ T, generally enables Δ Td=1/2* Δ T.According to RRU RF spot information, Δ Td, the reciprocity difference correction coefficient of needs is calculated, and is corrected using reciprocity difference correction coefficient sub-carrier phase.
The specific method that reciprocity difference correction coefficient is conversed by RRU RF spot information and Δ Td, can be used existing program in the industry, details are not described herein again.
In real system, BBU needs the time delay to multiple RRU to compensate, and specific structure can be as shown in Figure 5.
Optionally, delay inequality changing value acquiring unit can be integrated into a chip with SerDes, to reduce power consumption or wiring area.
The step of embodiment of the present invention further provides the Installation practice for realizing above scheme, and concrete scheme is realized and details can refer to above, hereafter only be briefly described.
As shown in fig. 6, the embodiment of the invention provides a kind of phase correction unit, phasing dress
BBU can be located at by setting, which includes Delay Variation value acquiring unit 601 and sub-carrier phase compensating unit 602.
Delay Variation value acquiring unit 601, the time delay value between recovered clock for obtaining the radio frequency unit RRU that BBU local clock and BBU are received twice in succession, calculates Delay Variation value according to the time delay value twice；
Sub-carrier phase compensating unit 602 for reciprocity difference correction coefficient to be calculated according to the Delay Variation value, and carries out phasing using the reciprocity difference correction coefficient sub-carrier.
Optionally, the time delay value that Delay Variation value acquiring unit 601 obtains between the recovered clock for the radio frequency unit RRU that BBU local clock and BBU are received includes that Delay Variation value acquiring unit 601 is read out to the clocking error phase demodulation value in the serializer/de-serializers SerDes of the BBU and processing obtains the time delay value.The processing may include: that the clocking error phase demodulation value is averaged or is filtered.
Optionally, the time delay value that Delay Variation value acquiring unit 601 obtains between the recovered clock for the radio frequency unit RRU that BBU local clock and BBU are received includes that the local clock and the recovered clock are carried out delay inequality detection to Delay Variation value acquiring unit 601 and processing obtains the time delay value.
Optionally, sub-carrier phase compensating unit, it include: the sub-carrier phase compensating unit for reciprocity difference correction coefficient to be calculated according to the Delay Variation value, for the reciprocity difference correction coefficient to be calculated according to the RF spot and the Delay Variation value of the subcarrier.
Optionally, Delay Variation value acquiring unit 601 such as can be filtered at the operation to time delay changing value, to filter out clock jitter.
It is realized it should be noted that above-mentioned phase correction unit can handle the necessary device such as cooperation memory, transceiver when implementing by least one.
Through the above description of the embodiments, it is apparent to those skilled in the art that the present invention can be realized with hardware realization or firmware realization or their combination mode.When implemented in software, above-mentioned function can be stored in computer-readable medium or as on computer-readable medium one or more instructions or code transmit.Computer-readable medium includes that computer is deposited
Storage media and communication media, wherein communication media includes convenient for from a place to any medium of another place transmission computer program.Storage medium can be any usable medium that computer can access.As example but be not limited to: computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disc storages, magnetic disk storage medium or other magnetic storage apparatus or can be used in carry or store have instruction or data structure form desired program code and can be by any other medium of computer access.Furthermore.Any connection appropriate can become computer-readable medium.Such as, if software is to be transmitted using the wireless technology of coaxial cable, optical fiber cable, twisted pair, Digital Subscriber Line (DSL) either such as infrared ray, radio and microwave etc from website, server or other remote sources, the wireless technology of coaxial cable, optical fiber cable, twisted pair, DSL or such as infrared ray, wireless and microwave etc includes in the fixing of affiliated medium.As used in the present invention, disk (Disk) and dish (disc) include compression optical disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and Blu-ray Disc, the usually magnetic replicate data of which disk, and dish is then with laser come optical replicate data.Combination above should also be as including within the protection scope of computer-readable medium.
In short, being not intended to limit the scope of the present invention the foregoing is merely the preferred embodiment of technical solution of the present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (10)
- A kind of method for correcting phase characterized by comprisingThe time delay value that Base Band Unit BBU obtains local clock between the recovered clock of radio frequency unit RRU that receives twice in succession；The Base Band Unit calculates Delay Variation value according to the time delay value twice；Reciprocity difference correction coefficient is calculated according to the Delay Variation value in the Base Band Unit, and carries out phasing using the reciprocity difference correction coefficient sub-carrier.
- The method according to claim 1, wherein the time delay value that the BBU obtains the recovered clock of local clock and the radio frequency unit RRU received includes:The BBU is read out the clocking error phase demodulation value in the serializer/de-serializers SerDes of the BBU, modulus and processing obtain the time delay value.
- According to any method of claim 2, which is characterized in that include: in the processingThe BBU is averaged or is filtered to the clocking error phase demodulation value.
- The method according to claim 1, wherein the time delay value that the BBU obtains the recovered clock of local clock and the radio frequency unit RRU received includes:The local clock and the recovered clock are carried out time delay detection to the BBU and processing obtains the time delay value.
- Method according to claim 1 to 4, which is characterized in that the Base Band Unit is calculated reciprocity difference correction coefficient according to the Delay Variation value and includes:The reciprocity difference correction coefficient is calculated according to the RF spot and the Delay Variation value of the subcarrier in the BBU.
- A kind of phase correction unit, which is characterized in that described device includes: Delay Variation value acquiring unit and sub-carrier phase compensating unit；The Delay Variation value acquiring unit, the time delay value between recovered clock for obtaining the radio frequency unit RRU that Base Band Unit BBU local clock and the BBU are received twice in succession, and Delay Variation value is calculated according to the time delay value twice；The sub-carrier phase compensating unit for reciprocity difference correction coefficient to be calculated according to the Delay Variation value, and carries out phasing using the reciprocity difference correction coefficient sub-carrier.
- Device according to claim 6, which is characterized in that the time delay value that the Delay Variation value acquiring unit is used to obtain between the recovered clock of the radio frequency unit RRU that the BBU local clock and the BBU are received includes:The Delay Variation value acquiring unit is read out for the clocking error phase demodulation value in the serializer/de-serializers SerDes to the BBU, modulus and processing obtain the time delay value.
- Device according to claim 7, which is characterized in that the processing includes: that the Delay Variation value acquiring unit is averaged or is filtered to the clocking error phase demodulation value.
- Device according to claim 6, which is characterized in that the time delay value that the Delay Variation value acquiring unit is used to obtain between the recovered clock of the radio frequency unit RRU that the BBU local clock and the BBU are received includes:The Delay Variation value acquiring unit, for the local clock and recovered clock progress time delay detection and processing to be obtained the time delay value.
- According to any device of claim 6-9, which is characterized in that the sub-carrier phase compensating unit includes: for reciprocity difference correction coefficient to be calculated according to the Delay Variation valueThe sub-carrier phase compensating unit, for the reciprocity difference correction coefficient to be calculated according to the RF spot and the Delay Variation value of the subcarrier.
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| PCT/CN2016/108403 WO2018098815A1 (en) | 2016-12-02 | 2016-12-02 | Phase correction method and device |
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| CN110024304A true CN110024304A (en) | 2019-07-16 |
| CN110024304B CN110024304B (en) | 2021-04-09 |
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| WO2012062080A1 (en) * | 2010-11-12 | 2012-05-18 | 中兴通讯股份有限公司 | Method and system for realizating delay compensation in a distributed base station system |
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| WO2006005228A1 (en) * | 2004-07-13 | 2006-01-19 | Utstarcom Telecom Co., Ltd. | A interfacing method between remote unit and centralized bs |
| CN101674589B (en) * | 2009-09-30 | 2012-01-25 | 中兴通讯股份有限公司 | Time-delay measuring method for transmitting channel, time-delay measuring device therefor, and time-delay compensation method for transmitting chain |
| CN103188009B (en) * | 2011-12-31 | 2018-01-09 | 中兴通讯股份有限公司 | Signal acceptance method and device |
| CN105656815B (en) * | 2014-11-11 | 2019-01-25 | 华为技术有限公司 | A kind of bearing calibration of radio-frequency channel and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170399A (en) * | 2007-11-28 | 2008-04-30 | 中兴通讯股份有限公司 | A clock synchronization method and distributed base station in distributed base station |
| CN101257343A (en) * | 2008-01-29 | 2008-09-03 | 北京北方烽火科技有限公司 | Data synchronization method for antenna to calibrate radio frequency far-end unit terminal |
| WO2012062080A1 (en) * | 2010-11-12 | 2012-05-18 | 中兴通讯股份有限公司 | Method and system for realizating delay compensation in a distributed base station system |
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