CN101729140A - Channel calibration method and device - Google Patents
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- CN101729140A CN101729140A CN200910222114A CN200910222114A CN101729140A CN 101729140 A CN101729140 A CN 101729140A CN 200910222114 A CN200910222114 A CN 200910222114A CN 200910222114 A CN200910222114 A CN 200910222114A CN 101729140 A CN101729140 A CN 101729140A
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Abstract
The invention discloses channel calibration method and device, wherein the method comprises the following steps of: dispatching the time slot of a preset frame; estimating an upper radio frequency channel and a lower radio frequency channel of equipment in the time slot, obtaining the gain and signal delay parameters of a sending part and a receiving part of the upper radio frequency channel and the lower radio frequency channel of the equipment, and computing the calibration compensation data of the equipment; and calibrating by applying the calibration compensation data in a weight value mode. The invention solves the problem of TDD-BF performance deterioration caused by the asymmetry or nonreciprocity of an upstream channel and a downstream channel of a TDD-BF, improves the calibration reliability and ensures the high-quality data transmission of beam shaping.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of channel calibration method and device.
Background technology
In recent years, the multi-antenna technology development has obtained large-scale application rapidly in the 4th third-generation mobile communication (4thGeneration mobile system abbreviates 4G as) and Long Term Evolution (Long TermEvolution abbreviates LTE as) system.In 4G, time-division wave beam forming (Time Division Duplex Beam Forming, abbreviate TDD-BF as), be also referred to as iteration antenna or intelligent antenna technology (Adaptive AntennaSystem, abbreviate AAS as) owing to can significantly improve the coverage of communication system and the quality of enhancing communication signal, and saved suitable base station number and then operation cost is reduced, therefore, be regarded as one of most important communication technology among the 4G.
But, at present still there is a lot of problems troubling the development of time-division wave beam forming technology, for example, the asymmetry of up-downgoing passage or nonreciprocity (non-channel reciprocity) cause the mis-behave of the especially present TDD-BF system that is extensively used of communication system.Because TDD-BF mainly is a principle of utilizing the up-downgoing symmetry, promptly, suppose that going up lower channel is symmetry or reciprocity, then the channel status information (ChannelState Information abbreviates CSI as) of the up estimation of base band is used for the data flow transmission of downgoing baseband.Therefore, guarantee that by the up-downgoing calibrate passage symmetry or reciprocity are the key measures of TDD-BF.
In addition, also the performance impact to wave beam forming is bigger for the external disturbance of Wimax/LTE system.Interference type is divided into presence of intercell interference, comprises with frequency or alien frequencies disturbing.Wherein, co-channel interference (the sector carrier frequency is identical) is bigger to the systematic function influence than alien frequencies system's (sector carrier frequency difference), thereby, need to consider interference protection measure.In addition, according to the checking result of Wimax Forum forum, the decline that spatial coherence (Spatial Correlation) causes much larger than descending, even may cause the up-link performance can't satisfy communicating requirement to the up channel Effect on Performance.These factors have greatly limited the performance of wave beam forming system.
Summary of the invention
Asymmetry or nonreciprocity at TDD-BF up-downgoing passage in the correlation technique cause the problem of TDD-BF mis-behave and propose the present invention, for this reason, main purpose of the present invention is to provide a kind of channel calibration method and device, one of to address the above problem at least.
To achieve these goals, according to an aspect of the present invention, provide a kind of channel calibration method.
Channel calibration method according to the present invention comprises: the time slot of scheduling predetermined frame; At above-mentioned time slot, lower channel on the radio frequency of equipment is estimated, obtain that lower channel sending part on the radio frequency of equipment divides and the gain and the signal delay parameter of receiving unit, and calculate the compensation for calibrating errors data of equipment; Using the compensation for calibrating errors data in the weights mode calibrates.
Preferably, the time slot of scheduling predetermined frame comprises: radio frequency and base band consult to select the position and the length of above-mentioned time slot, and dispatch above-mentioned time slot by MAC.
Preferably, transmit the signal of OFDM form at above-mentioned time slot.
Preferably, above-mentioned compensation for calibrating errors data comprise amplitude compensation value and phase compensation value.
Preferably, using above-mentioned compensation for calibrating errors data in the weights mode calibrates and comprise: amplitude compensation value that above-mentioned compensation for calibrating errors data is comprised in the weights mode and phase compensation value carry out conjugate multiplication with base band data to be sent respectively.
Preferably, after calculating the compensation for calibrating errors data of equipment, said method also comprises: employing scheduling sub-carriers and/or subcarrier interpolation method are done interference eliminated, and being used for weakening in the sub-district influences the calibration phase value with the minizone co-channel interference.
Preferably, above-mentioned subcarrier interpolation method comprises linear interpolation method, low-pass filter value method and Wei Na interpolation method.
To achieve these goals, according to a further aspect in the invention, provide a kind of calibrate device.
Calibrate device according to the present invention comprises: scheduler module is used to dispatch the time slot of predetermined frame; Estimating module is used for the time slot in the scheduler module scheduling, lower channel on the radio frequency of equipment is estimated the gain and the signal delay parameter of lower channel sending part branch and receiving unit on the radio frequency of acquisition equipment; Computing module is used for the compensation for calibrating errors data that the gain that obtains according to estimating module and signal delay parameter calculate equipment; Calibration module, the compensation for calibrating errors data that are used to use the weights mode that computing module calculates are calibrated.
Preferably, above-mentioned scheduler module also comprises: select module, be used for position and length that radio frequency and base band consult to select time slot.
Preferably, said apparatus also comprises: first interference cancellation module, be used for by scheduling sub-carriers do that interference eliminated weakens in the sub-district and the minizone co-channel interference to the influence of calibration phase value; Second interference cancellation module, be used for by the subcarrier interpolation method do that interference eliminated weakens in the sub-district and the minizone co-channel interference to the influence of calibration phase value.
By the present invention, adopt the mode of calibration of radio frequency and Baseband Channel and interference eliminated, solved that the asymmetry or the nonreciprocity of TDD-BF up-downgoing passage causes the problem of TDD-BF mis-behave in the correlation technique, and then reached the interference that increases radio system and suppress, improve the reliability of calibration and guarantee the effect that transmission of wave beam forming quality data and coverage enlarge.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the channel calibration method of the embodiment of the invention;
Fig. 2 is the base station calibration schematic diagram data according to the embodiment of the invention;
Fig. 3 is to system gain impact analysis schematic diagram according to phase error in the calibrate of the embodiment of the invention;
Fig. 4 is according to the impact analysis schematic diagram of out of phase error in the calibrate of the embodiment of the invention to system gain;
Fig. 5 is the radio system path calibration phase compensation value calculating schematic diagram according to the embodiment of the invention;
Fig. 6 is the simulation result figure according to the calculating actual emulation value of the radio system path phase compensation value of the embodiment of the invention and calculating phase difference;
Fig. 7 is the structured flowchart according to the calibrate device of the embodiment of the invention;
Fig. 8 is the preferred construction block diagram according to the calibrate device of the embodiment of the invention;
Fig. 9 is the radio system calibrate structured flowchart according to the embodiment of the invention;
Figure 10 is the test macro connection layout according to the embodiment of the invention;
Figure 11 is the physical channel calibration simulated effect figure according to the embodiment of the invention.
Embodiment
Functional overview
The embodiment of the invention provides a kind of calibrate scheme, time slot by the scheduling predetermined frame, do not measuring each radio-frequency channel phase difference as signal source under the traffic affecting condition, and feed back to base band and carry out conjugate multiplication, thereby reduce because the nonreciprocal phase error of bringing of radio-frequency apparatus up-downgoing, and the interference protection measure of scheduling of employing subcarrier or subcarrier interpolation, reduced in the sub-district and interference such as adjacent sub-district and Frequency Synchronization cause the baseband signal phase distortion, increase the reliability that the interference of radio system is suppressed and improved calibration, improved the performance of TDD-BF system.
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Method embodiment
According to embodiments of the invention, provide a kind of channel calibration method.
Fig. 1 is the flow chart according to the channel calibration method of the embodiment of the invention, and as shown in Figure 1, this method comprises that following step S102 is to step S106:
Step S102, the time slot of scheduling predetermined frame.
Wherein, radio frequency and base band consult to select the position and the length of above-mentioned time slot and pass through the MAC time slot scheduling.
Particularly, do not select control or broadcast message place time slot, as (the Mobile Application Part of the up-downgoing MAP among the Wimax, abbreviate MAP as), otherwise will lose the control or the broadcast message of this frame, thereby can only select business datum place time slot, as need the data subcarrier place time slot of figuration; Next is considered as the size of the amount of information of signal source and is not influenced business, selects one or two complete time slot of signal source.
Particularly, radio system is upgraded calibration data and is sent to base band and be used for the figuration data and begin regular traffic.Calibrating the required symbol of single passage is the signal source of 1～2 time slot services resource as RF calibration.
Step S104 at above-mentioned time slot, estimates lower channel on the radio frequency of equipment, obtains that lower channel sending part on the radio frequency of equipment divides and the gain and the signal delay parameter of receiving unit, and calculates the compensation for calibrating errors data of equipment.
Step S106 uses the compensation for calibrating errors data in the weights mode and calibrates.
Particularly, amplitude compensation value that the compensation for calibrating errors data is comprised in the weights mode and phase compensation value carry out conjugate multiplication with base band data to be sent respectively, and as shown in Figure 2, Fig. 2 is the base station calibration schematic diagram data according to the embodiment of the invention.
Particularly, each orthogonal frequency-division multiplex singal of every antenna that obtains from the radio-frequency channel (Orthogonal Frequency Division Multiplexing, OFDM) total channel compensation value (comprising amplitude and the phase place) w of the up-downgoing passage of subcarrier
C, kFor
w
c，k(m)＝a
m，kexp(jθ
m，k)，m＝0，1，2，...，M-1；
K is a sub-carrier indices, comprises amplitude a
M, kWith phase compensation j θ
M, kM is the transmitting antenna number;
It is Y that the TDD-BF downgoing baseband sends data, and weights and radio-frequency (RF) FEEDBACK channel compensation value are handled together, is equivalent to the transmission data be multiply by one group of new weights be:
Through data Z behind the weighted sum channel compensation be: Z
M, k=Y
M, k* W
Final, k(m)
After step S104, also comprise and adopt scheduling sub-carriers and subcarrier interpolation method to weaken and of the influence of minizone co-channel interference the sub-district in the compensation for calibrating errors value, thereby reduce the beamformed signals mis-behave, wherein, the subcarrier interpolation method comprises linear interpolation method, low-pass filter value method and Wei Na interpolation method.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
In the present embodiment, radio system is adjusted the subcarrier amplitude/power and the phase place of each beamformed signals passage of base band in the base station, transmit the real part and the imaginary signals of amplitude-phase calibration data, and each antenna is transmitted data by OFDM bandwidth or sub-carrier number calibrate, the data of wave beam forming multiply each other on each OFDM subcarrier compensation for calibrating errors value and this subcarrier.Wherein unique corresponding work of the data of wave beam forming calibrate and OFDM subcarrier arranged and transmitted calibration data by dispatch.
Radio system notice base band dispatching office needs the time slot of predetermined frame, produce calibration data and also send base band to, according to the time+minute+second+relatively frame number+descending several symbols at this moment crack synchronization message and message structure calibrate, comprise signaling+message count+lock in time.
Signal source employing OFDM subcarrier is sent out continuously a plurality of signals of Cyclic Prefix insertion (Cyclic Prefix) symbol that comprise and is carried out phase algorithm emulation, all unite (Recursive Mean Square in the side by feedback, abbreviate RMS as) and discrete pair of upright leaf conversion (DiscreteFrequency Transfer, abbreviate DFT as) calculate to receive data and obtain passage sub-carrier phase characteristic, obtain other passage subcarrier this passage sub-carrier phase relatively again, obtain the absolute time delay of path and calculate the phase difference of each passage, as calibrate phase compensation.
Wherein, the calibrate parameter comprises that calibration port is to each aerial radiation port amplitude and phase place maximum deviation.Produce signal source by transmitting terminal during calibration and receive data, use the figuration calibration data to do the up-downgoing channel status and detect by the antenna coupling path.
Calibration process is that calibration data receive to interrupt, and switches to the wave beam forming calibration signal source, stops the calibration sampling after reading and preserve calibration data, specifically comprise the calibration condition judgement, calibration timing controlled and startup, calibration data are handled and are transmitted, and provide and interrupt and each calibrate control function.Calibrating installation comprises base band+radio system+Anneta module, and calibration point is arranged on inner each main channel, the feedback path state of detecting of radio system.
Fig. 3 is to system gain impact analysis schematic diagram according to phase error in the calibrate of the embodiment of the invention, according to phase compensation value in Fig. 3 schematic diagram emulation calibrate to the influence of system gain as shown in Figure 4, Fig. 4 is according to the impact analysis schematic diagram of out of phase error in the calibrate of the embodiment of the invention to system gain.
The up-downgoing passage can be calibrated with offset data with respect to benchmark passage comprehensive differences.Fig. 5 is the radio system path calibration phase compensation value calculating schematic diagram according to the embodiment of the invention, as shown in Figure 5, when adopting no disturbance phase place respectively and the disturbance phase place being arranged, the calculating of the actual phase of radio system I/Q passage and calibration phase place, at first calculate phase place and do not have disturbance, no additive white Gaussian noise (Additive White Gaussion Noise, abbreviating AWGN as) passage time calibration is with the real part and the imaginary part phase value I0/Q0 of signal source, calculating phase place subsequently has disturbance, the calibration real part and the imaginary part phase value I1/Q1 of signal source when adding the AWGN passage.The phase value of I0/Q0 and I1/Q1 is subtracted each other the calibration signal source phase calibration values that promptly draws reality, wherein, specifically used the inverse transformation IFFT of fast Fourier transform to generate ofdm signal.
Particularly, when no phase perturbation (phase perturbation all is 0 degree), no AWGN, the I that obtains (n), Q (n) are " AAS calibration signal source ".Wherein, for binary phase shift keying (Binary Phase-Shift Keying abbreviates BPSK as) modulation, initial phase is x, x degree; When adding phase perturbation and adding AWGN, the I that obtains (n), Q (n) are " the AAS calibration is with receiving data ", phase perturbation wherein is actual phase value (Real Phase), by calculating, obtain the phase place of " the AAS calibration receives data ", wherein, phase place is calculated phase values (Cal Phase) herein, by further calculating, obtain the phase difference of Real Phase and Cal Phase.
Finish the compensation for calibrating errors value and calculate, calculate phase of received signal by signal source.Transmit and do phase of received signal weighting and the compensation of each calibrate value, sending then at single channel, the multichannel combination sends.
Fig. 6 is according to the simulation result figure of the calculating actual emulation value of the radio system path phase compensation value of the embodiment of the invention and calculating phase difference, as shown in Figure 6, has provided actual phase, calibrates phase place and truly calibrates phase relation.Show that each subcarrier is actual and calculate phase place, actual phase, the comparison of calculating phase difference in the 100th to 800 sub-reference carrier waves.
Radio system reciprocity node, i.e. radio-frequency receiving-transmitting point RX/TX junction, its transceiver channel is nonreciprocal channel, comprises 4 tunnel up-downgoing passages, is respectively RX1/TX1, RX2/TX2, RX3/TX3, RX4/TX4.Doing downlink forming+nonreciprocal channel calibration according to upward signal compensates.Each node signal phase place is respectively P1, P2, and P3, P4, radio frequency is respectively PRX1 to base band RX signal phase, PRX2, PRX3, PRX4, then base band RX phase signal is respectively: P1+PRX1, P2+PRX2, P3+PRX3, P4+PRX4.
The corresponding compensation for calibrating errors of baseband transmit signals phase place can be selected one of following both schemes:
1)0，PRX1+PTX1-PRX2-PTX2，PRX1+PTX1-PRX3-PTX3，PRX1+PTX1-PTX4-PTX4
2)-PRX 1-PTX 1 ,-PRX2-PTX2 ,-PRX3-PTX3 and-PRX4-PTX4
First is to be that benchmark is calibrated with first antenna phase PRX1+PTX1, and second is that benchmark is calibrated for the phase deviation of uplink and downlink in each antenna radio system then.
The phase alignment offset that radio system sends to baseband signal is respectively:
P1+PRX1+PTX1，P2+PRX1+PTX1，P3+PRX1+PTX1，P4+PRX1+PTX1。
Embodiment 2
Disturbance restraining method
In the present embodiment, interference eliminated (Interference cancellation, IC) algorithm used subcarrier frequency division multiple access, BF space multiple access, frame tdma come the enhancing signal interference-to-noise ratio (Signal interference and noise ratio, SINR) and antijamming capability.When the sub-district co-channel interference appearred facing in many sectors, the orthogonality of data subcarrier, space multiple access was not good, was about to adopt the IC algorithm to eliminate the sub-district co-channel interference on the base band.When up user's co-channel interference intensity surpasses thresholding, user's downlink frame is dispatched to other subcarrier, reduces greatly in the possibility that exists that next frame faces the sub-district co-channel interference because of adjusting subcarrier by base band.
Adopted frame slot as the error between signal source measurement multichannel at TDD-BF, but because the error of the interference of minizone and adjacent sub-district and OFDM synchronizing signal can cause the distortion of channel phases measurement data, thereby make the calibration of baseband amplitude phase error cause the BF system performance degradation, Fig. 4 is according to the impact analysis schematic diagram of out of phase error in the calibration of the embodiment of the invention to system gain, as shown in Figure 4, different channel phases errors have been provided to the analysis of TDD-BF system gain deleterious effects.
Down going channel calibration phase compensation value can not guarantee each OFDM subcarrier transmitter, phase unanimity as being subjected to than strong jamming, and then corresponding subcarrier adopts dispatching method to be transferred on other down going channel of this frame signal.
The number that carrier wave is disturbed does not exceed one and delimits, and can adopt the compensation scheme of adjacent OFDM subcarrier interpolation (Interpolation), and the interpolation scheme of the subcarrier that is replaced is as follows:
M=0 wherein, 1,2 ..., M-1 represents the sequence number of OFDM subcarrier in the subchannel, and k is subjected to the interfering sub-carrier position for what need to replace, and l is the length of subcarrier, and GI is the physical separation of intercarrier, H
p() is adjacent subcarrier.Interpolation as first subcarrier is estimated as follows:
Wherein, linear difference method algorithm is fairly simple, is easy to realize, also can select low-pass filter value method and Wei Na differential technique etc. for use.
In above embodiment, can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
Device embodiment
According to embodiments of the invention, provide a kind of calibrate device.
Fig. 7 is the structured flowchart according to the calibrate device of the embodiment of the invention, and as shown in Figure 7, this device comprises scheduler module 72, estimating module 74, computing module 76 and calibration module 78, below said structure is described in detail:
Scheduler module 72 is used to dispatch the time slot of specific frame;
Estimating module 74 is connected to scheduler module 72, is used for the time slot in scheduler module 72 scheduling, lower channel on the radio frequency of equipment is estimated the gain and the signal delay parameter of lower channel sending part branch and receiving unit on the radio frequency of acquisition equipment;
Computing module 76 is connected to estimating module 74, is used for the compensation for calibrating errors data that the gain that obtains according to estimating module 74 and signal delay parameter calculate equipment;
Calibration module 78 is connected to computing module 76, and the compensation for calibrating errors data that are used to use the weights mode that computing module 76 calculates are calibrated.
Fig. 8 is the preferred construction block diagram according to the calibrate device of the embodiment of the invention, and as shown in Figure 8, this device comprises first interference cancellation module 82, second interference cancellation module 84, below said structure is described in detail:
First interference cancellation module 82, be used for by scheduling sub-carriers do that interference eliminated weakens in the sub-district and the minizone co-channel interference to the influence of calibration phase value;
Second interference cancellation module 84, be used for by the subcarrier interpolation method do that interference eliminated weakens in the sub-district and the minizone co-channel interference to the influence of calibration phase value.
Fig. 9 is the radio system calibrate structured flowchart according to the embodiment of the invention, and as shown in Figure 9, the calibration module among Fig. 9 is corresponding to above-mentioned calibration module 78.Nonreciprocal part is by time slot scheduling, calculates offset and sends to calibration module and calibrate.
Figure 10 is the test macro connection layout according to the embodiment of the invention, as shown in figure 10, by baseband processing unit BBU (Building Base band Unite, abbreviate BBU as) and radio frequency remoto module (Remote Radio Unit, abbreviate RRU as) increase calibration and interference inhibit feature or do not have under the calibration interference inhibit feature situation observed wave beam forming flow output situation from the terminal data card.Figure 11 is according to the physical channel of embodiment of the invention calibration simulated effect figure, has showed in the test macro of reality the effect of calibration program among the present invention.Table 1 is to summary every among Figure 11, mainly observes in the calibration result difference of calibration data between a plurality of symbols in each radio-frequency channel, and data are gathered from the RRU internal data.
Table 1 test result is summed up
| Number of times | Result's (RRU powers on) | Explanation |
| The 1st time | Terminal high-order flow is normal | Calibration result just often |
| The 2nd time | It is 0 that the terminal flow falls | Radio frequency RX0,1,2,3 data are disturbed variation, (no anti-interference, as not have calibration) |
| The 3rd time | The terminal flow recovers | Than the 2nd calibration, RX0,1,2,3 data are improved, and difference is basically all after behind the decimal point the 4th, on a small quantity at the 3rd.Difference is little not as the 0th time.(have anti-interference, calibration) |
| The 4th | The terminal flow descends | Than the 3rd calibration, the RX1 control breakdown, flow descends very obvious ((no anti-interference, as not have calibration) |
| The 5th | The terminal flow reduces to 0 | The same with the 4th calibration, RX1 is still very poor, traffic loss (no anti-interference, as not have calibration) |
| The 6th time | The terminal flow recovers | Compare the 5th, flow recovers, (have anti-interference, calibration) |
| The 7th time | It is 0 that the terminal flow falls | Compare RX0,1,2,3 whole variation (no anti-interference, as not have calibration) the 6th time |
| The 8th time | The terminal flow recovers | Calibration data performance is identical with the 3rd time, (have anti-interference, calibrate) |
| The 9th time | Peak flow can reach requirement, but fluctuation is violent | It is 0 that flow does not fall, but big ups and downs (no anti-interference, as not have calibration) |
| The 10th time | The decline that continues of terminal peak flow, fluctuation is violent | Than the 9th time, the further variation of Rx1, peak flow further descend (no anti-interference, do not have calibration) |
| The 11st time | It is 0 that the terminal flow falls | RX0 variation, RX1,2 also bad (no anti-interference, as not have calibration) |
| The 12nd time | It is normal that the terminal flow recovers | (have anti-interference, calibration) |
Conclusion: the variation of calibration data, cause very sensitive influence to meet TDD-BF technical pattern fully to service traffics.This shows that calibration and interference suppression measure are very important to TDD-BF.
The present invention has provided two kinds of schemes that improve performance in Wimax and LTE in the very important TDD-BF wave beam forming technology, the one, adopt the particular time-slot in the base band frame signal, do not measuring each radio-frequency channel phase difference as signal source under the traffic affecting condition, and feed back to base band and carry out conjugate multiplication, thereby reduce owing to the nonreciprocal phase error of bringing of radio-frequency apparatus up-downgoing, improve the performance of wave beam forming; Secondly, because interference such as in the sub-district and adjacent sub-district and Frequency Synchronization cause the baseband signal phase distortion, adopted the interference protection measure of subcarrier scheduling and subcarrier interpolation in order to reduce, thus the raising systematic function.The present invention gives actual influence and the data analysis of phase difference between channels to the TDD-BF system.Last emulation proves that these two schemes have played the effect of obvious raising systematic function.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a channel calibration method is characterized in that, comprising:
The time slot of scheduling predetermined frame;
At described time slot, lower channel on the radio frequency of equipment is estimated, obtain described
The gain and the signal delay of lower channel sending part branch and receiving unit on the radio frequency of equipment
Parameter, and calculate the compensation for calibrating errors data of equipment;
Using described compensation for calibrating errors data in the weights mode calibrates.
2. method according to claim 1 is characterized in that, the time slot of described scheduling predetermined frame comprises: radio frequency and base band consult to select the position and the length of described time slot, and dispatch described time slot by MAC.
3. method according to claim 1 and 2 is characterized in that, transmits the signal of OFDM form at described time slot.
4. method according to claim 1 is characterized in that, described compensation for calibrating errors data comprise amplitude compensation value and phase compensation value.
5. according to claim 1 or 4 described methods, it is characterized in that, use described compensation for calibrating errors data in the weights mode and calibrate and comprise:
Amplitude compensation value that described compensation for calibrating errors data is comprised in the weights mode and phase compensation value carry out conjugate multiplication with base band data to be sent respectively.
6. method according to claim 1 is characterized in that, after calculating the compensation for calibrating errors data of equipment, described method also comprises:
Employing scheduling sub-carriers and/or subcarrier interpolation method are done interference eliminated, and being used for weakening in the sub-district influences the calibration phase value with the minizone co-channel interference.
7. method according to claim 6 is characterized in that, described subcarrier interpolation method comprises linear interpolation method, low-pass filter value method and Wei Na interpolation method.
8. a calibrate device is characterized in that, comprising:
Scheduler module is used to dispatch the time slot of predetermined frame;
Estimating module is used for the described time slot in scheduler module scheduling, and lower channel on the radio frequency of equipment is estimated, and obtains that lower channel sending part on the radio frequency of described equipment divides and the gain and the signal delay parameter of receiving unit;
Computing module is used for the compensation for calibrating errors data that the described gain that obtains according to estimating module and described signal delay parameter calculate described equipment;
Calibration module, the described compensation for calibrating errors data that are used to use the weights mode that computing module calculates are calibrated.
9. device according to claim 8 is characterized in that, described scheduler module also comprises:
Select module, be used for position and length that radio frequency and base band consult to select described time slot.
10. device according to claim 8 is characterized in that, described device also comprises:
First interference cancellation module, be used for by scheduling sub-carriers do that interference eliminated weakens in the sub-district and the minizone co-channel interference to the influence of calibration phase value;
Second interference cancellation module, be used for by the subcarrier interpolation method do that interference eliminated weakens in the sub-district and the minizone co-channel interference to the influence of calibration phase value.
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| WO2013003974A1 (en) * | 2011-07-01 | 2013-01-10 | Telefonaktiebolaget L M Ericsson (Publ) | Beamforming with phase compensation |
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