CN101505179A - Independent self-calibration method and system for remote equipment, baseband equipment - Google Patents
Independent self-calibration method and system for remote equipment, baseband equipment Download PDFInfo
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- CN101505179A CN101505179A CNA2008100577009A CN200810057700A CN101505179A CN 101505179 A CN101505179 A CN 101505179A CN A2008100577009 A CNA2008100577009 A CN A2008100577009A CN 200810057700 A CN200810057700 A CN 200810057700A CN 101505179 A CN101505179 A CN 101505179A
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Abstract
The invention discloses an independent self-calibration method for remote equipment, which comprises the steps of: controlling a programmable logic controller (FPGA) of the remote equipment through a central processing unit (CPU) of the remote equipment to finish the calibration of the remote equipment to radiofrequency and intermediate frequency parts; and compensating the deviation of the amplitude and the phase among various working antennas based on a calibration result. The invention also discloses an independent self-calibration system for the remote equipment as well as an independent self-calibration method and an independent self-calibration system for baseband equipment. The method and the system can realize the mutually independent self-calibration of the remote equipment and the baseband equipment.
Description
Technical field
The present invention relates to the collimation technique of remote equipment and baseband equipment, relate in particular to the independent self-calibration method and the system of a kind of remote equipment, baseband equipment.
Background technology
In the present wireless communication system, wireless base system is made up of a local baseband equipment and several far-end equipment usually.Common local baseband equipment is Base Band Unit (BBU, Base Band Unit), and remote equipment is remote radio unit (RRU) (RRU, Remote Radio Unit).Figure 1 shows that the system construction drawing of a wireless base system.Wireless base system among Fig. 1 comprises BBU1, RRU2 and antenna coupling box dish 3.And, adjust the aerial angle on the antenna coupling box dish 3 by the intercommunication mutually between BBU1 and the RRU2.
Owing to have different integrated circuit boards in the multi-antenna wireless base station system, and there is the difference of amplitude and phase place in different integrated circuit boards usually as individuality, and this difference can influence the normal transmitting-receiving of data.Therefore in order to guarantee the normal transmitting-receiving of data, need calibrate and detect remote equipment in the wireless base system and baseband equipment.Wherein, the calibration to remote equipment comprises a calibration and receives calibration.Specifically, be exactly the calibration of RRU being received and dispatched path.Here, the transmitting-receiving path comprises active channel and calibration path.Wherein active channel is used to send signal or receives from the next signal of subscriber equipment (UE).The calibration path only is used for the calibration operation path, can't or receive the next signal from UE to the space radiation signal.So, compensate the difference of each integrated circuit board amplitude and phase place, can guarantee the N road by calibration to RRU transmitting-receiving path, such as N=4,6,8 these effective consistency of transmitting-receiving paths amplitude and phase place on the position of eating dishes without rice or wine.
And in the network of wireless communication system, in order to realize the smart antenna function, also need periodically antenna array to be carried out antenna calibration, compensate the amplitude between each active channel and the deviation of phase place.Here, antenna calibration also is divided into a calibration and receives calibration.In addition, in order to guarantee the reliability of active channel, guarantee that there is not physical damage in active channel, also needs active channel is detected.
At above-mentioned calibration problem, based on wireless base system shown in Figure 1, sending out calibration phase, prior art solutions is: BBU1 sends out calibrating sequence at the GP time slot by the work antenna, by optical fiber this calibrating sequence is transferred to RRU2 afterwards; And BBU1 triggers the programmable logic controller (PLC) (FPGA) of RRU2, and FPGA control radio frequency, the intermediate-frequency section and the antenna of will working send to the operation of eating dishes without rice or wine.RRU2 gets this calibrating sequence back by boresight antenna again, returns BBU1 by Optical Fiber Transmission then; It is that calibration algorithm obtains the amplitude of every antenna and the deviate of phase place that BBU1 calculates by channel impulse response; Average after the deviate that obtains repeatedly phase place and amplitude, according to resulting mean value, the control by BBU1 compensates antenna, makes the antenna of respectively working keep same amplitude and phase place.
Receive the implementation and the implementation basically identical of sending out calibration phase of calibration phase, difference only is that receiving calibration phase be to send out calibrating sequence by boresight antenna, receives calibrating sequence by the work antenna.In addition, can access the antenna number of effective transmission, and send to quick control (FC, Fast Control) use by the implementation of sending out calibration phase; The number of the antenna of effective reception be can access by the implementation of receiving calibration phase, and smart antenna joint-detection (SJ, SmartAntenna andJoint Detection) and synchronous detecting (SD, Sync Detect) use sent to.
At sending out a calibration phase, when the work antenna was sent out calibrating sequence, N root active channel was simultaneously at GP slot offset 32 chips, and sent the calibrating sequence of 35 chip lengths.And the calibrating sequence of every antenna is obtained by the difference displacement of basic sequence.After the calibration path is received calibrating sequence, do the calculating of channel impulse response based on fast fourier transform, thereby obtain the amplitude of every antenna and the deviate of phase place.Here it is pointed out that the calibration path is in accepting state when sending out calibrating sequence, active channel is in transmit status.
At receiving calibration phase, when boresight antenna was sent out calibrating sequence, the N root was calibrated path simultaneously at GP slot offset 32 chips, and sent the calibrating sequence of 35 chip lengths.And the calibrating sequence of every antenna is obtained by the difference displacement of basic sequence.After active channel receives calibrating sequence, do the calculating of channel impulse response, thereby obtain the amplitude of every antenna and the deviate of phase place based on fast fourier transform.Here it is pointed out that the calibration path is in transmit status when sending out calibrating sequence, active channel is in accepting state.
In sum, below for adopting the shortcoming that prior art had.
One, adopts prior art, need baseband equipment to send and the reception calibrating sequence, and participate in the corresponding data processing operation, and the parts that are for data processing in the existing baseband equipment are generally Digital Signal Processing (DSP) unit, will certainly increase the expense of DSP unit in the baseband equipment so.And the transmission of calibrating sequence and calibration control signal, make the Interface design work that relates in the wireless base system become complicated.
Two, because Optical Fiber Transmission has time-delay, cause the calibrating sequence of present frame transmission in time to arrive and to come into force, need could to arrive and come into force behind two frames.Therefore, adopt prior art, when the amplitude of adjusting each antenna active channel and phase place, have real-time difference and instable problem.
Three, adopt prior art, need relate to baseband equipment, remote equipment and antenna coupling box dish in the wireless base system, just can finish of the calibration of primary calibration path, make the calibration and the detection time of active channel long active channel.And active channel is long, has physical damage even if detect active channel, also is not easy to locate and overhaul rapidly the active channel of physical damage.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of independent self-calibration method of remote equipment, can realize remote equipment and baseband equipment self calibration independent of each other.
Another object of the present invention is to provide a kind of independent self-calibration system of remote equipment, can realize remote equipment and baseband equipment self calibration independent of each other.
Another purpose of the present invention is to provide a kind of independent self-calibration method of baseband equipment, can realize remote equipment and baseband equipment self calibration independent of each other.
A further object of the present invention is to provide a kind of independent self-calibration system of baseband equipment, can realize remote equipment and baseband equipment self calibration independent of each other.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method of remote equipment independent self-calibration, this method comprises: control the FPGA of described remote equipment by the central processing unit (CPU) of remote equipment self, finish the calibration of remote equipment to radio frequency, intermediate-frequency section; Compensate the amplitude of respectively working between the antenna and the deviation of phase place based on the result of described calibration.
Wherein, this method also comprises: according to the calibration algorithm that sets in advance among the described FPGA, finish the calculating of channel impulse response in described remote equipment.
Wherein, sending out calibration phase, this method is specially:
A11, when judging that present frame is the frame that is used to do to calibrate, the CPU of described remote equipment self controls described FPGA and finishes remote equipment by the transmission of work antenna to calibrating sequence, and described calibrating sequence is sent to the antenna coupling disc;
After A12, described remote equipment receive described calibrating sequence by boresight antenna from described antenna coupling disc,, obtain the channel estimation coefficient that each antenna is sent out passage by the channel estimating that described FPGA realizes sending out passage;
A13, the channel estimation coefficient that described each antenna is sent out passage add up and on average, judge the state of current each antenna, and the state of described current each antenna is reported described antenna coupling disc, make the antenna of respectively working keep same amplitude and phase place.
Wherein, receiving calibration phase, this method is specially:
A21, when judging that present frame is the frame that is used to do to calibrate, the CPU of described remote equipment self controls described FPGA and finishes remote equipment by the transmission of boresight antenna to calibrating sequence, and described calibrating sequence is sent to the antenna coupling disc;
After A22, described remote equipment receive described calibrating sequence by the work antenna from described antenna coupling disc,, obtain the channel estimation coefficient that each antenna is received passage by the channel estimating that described FPGA realizes receiving passage;
A23, the channel estimation coefficient that described each antenna is received passage add up and on average, judge the state of current each antenna, and the state of described current each antenna is reported described antenna coupling disc, make the antenna of respectively working keep same amplitude and phase place.
A kind of system of remote equipment independent self-calibration, this system comprises: alignment unit and compensating unit; Wherein,
Alignment unit is used for after the CPU by remote equipment self controls the FPGA of described remote equipment, finishes the calibration of remote equipment to radio frequency, intermediate-frequency section; Calibration result is sent to described compensating unit;
Compensating unit, after being used for receiving described calibration result from described alignment unit, respectively work the amplitude between the antenna and the deviation of phase place of compensation based on calibration result.
Wherein, described alignment unit is further used for finishing the calculating of channel impulse response according to the calibration algorithm that sets in advance among the FPGA in described remote equipment.
A kind of method of baseband equipment independent self-calibration, this method may further comprise the steps:
DSP unit in B1, the baseband equipment sends special sequence to remote equipment via the downlink working path; Described remote equipment returns to described baseband equipment after adding described special sequence to up active channel;
After DSP unit in B2, the baseband equipment receives the special sequence that remote equipment returns by up active channel, sent between the special sequence that the remote equipment of the special sequence of remote equipment and the current reception in DSP unit returns in the DSP unit, adopt the DSP unit to compare, the reliability of execution work path detects.
Wherein, also comprise behind the step B2:
B3, carry out the prompting of corresponding fault alarm, when orienting the work at present path and be in the physical damage state, take corresponding treatment measures according to different comparison results.
A kind of system of baseband equipment independent self-calibration, this system comprises: transmitting element, receiving element and comparing unit; Wherein,
Transmitting element, the DSP unit that is used for baseband equipment sends special sequence to remote equipment via the downlink working path;
Receiving element after being used for described remote equipment and receiving described special sequence, returns to described baseband equipment after adding special sequence to up active channel;
Comparing unit is used for having sent between the special sequence that the remote equipment of the special sequence of remote equipment and the current reception in DSP unit returns in the DSP unit, adopts the DSP unit to compare, and the reliability of execution work path detects.
Wherein, this system also comprises: the fault alarm Tip element, after being used for obtaining comparison result, carry out corresponding fault alarm prompting according to different comparison results from described comparing unit, and the position of orienting physical damage in the active channel.
Prior art must be by the DSP unit in the baseband equipment, and the single-chip microcomputer that promptly is used for Digital Signal Processing is controlled the FPGA of remote equipment, finishes the calibration of remote equipment to radio frequency and intermediate-frequency section.And the calculating of channel impulse response is that calibration algorithm also is by finishing in the baseband equipment.That is to say, must just can finish the calibration of remote equipment and baseband equipment by intercommunication mutually and the cooperation between baseband equipment and the remote equipment.In addition, in order to guarantee the reliability of active channel, guarantee that there is not physical damage in active channel, need carry out reliability to the active channel of baseband equipment and detect that prior art also must and cooperate by the intercommunication mutually between baseband equipment and the remote equipment just can be finished this reliability and detect.
And the CPU of the present invention by remote equipment self controls FPGA, finishes the calibration of remote equipment to radio frequency and intermediate-frequency section, the result of calibration can be compensated the amplitude between each active channel and the deviation of phase place at remote equipment.And the calculating of finishing channel impulse response in remote equipment is calibration algorithm.Thereby realize the self calibration of remote equipment.In addition, numerical portion is placed on baseband equipment, realizes the self calibration of base station equipment.Like this, need not common compounding practice by remote equipment and baseband equipment, remote equipment and baseband equipment respectively as separate equipment also can control the gain of each antenna voluntarily, the reliability that compensates amplitude between each active channel and the deviation of phase place and the path of finishing the work detects.The present invention can also be applied to finish the work the detection of path and calibration path simultaneously to the calibration of active channel under time division duplex (TDD) and Frequency Division Duplexing (FDD) (FDD) working method, realize remote equipment and baseband equipment self calibration independent of each other.
In sum, adopt the present invention to have the following advantages:
One, adopt the present invention, the calibrating sequence of present frame transmission can in time arrive and come into force, and is real-time; Just can realize the adjustment of the amplitude and the phase place of each antenna active channel at present frame.
Two, adopt the present invention, make the Interface design work that relates in the wireless base system become complicated, simplified and inserted the interface of remote equipment and baseband equipment, and simplified the realization flow of calibration.
Three, utilize the CPU of the FPGA of remote equipment and remote equipment self just can realize the self calibration of remote equipment at an easy rate.And the result of calibration can be compensated the phase place between each active channel and the deviation of amplitude at remote equipment.Simultaneously, need not to relate to baseband equipment, remote equipment and antenna coupling box dish in the wireless base system, just can finish of the calibration of primary calibration path, and can detect the physical damage of active channel and the problem of numerical portion reliably active channel.Thereby calibration and detection time to active channel are shortened greatly, and also shortening greatly of active channel, by this remote equipment and the easier problem place of orienting of baseband equipment calibration independent of each other.
Description of drawings
Fig. 1 is the composition structural representation of existing wireless base system;
Fig. 2 is the realization flow schematic diagram of remote equipment independent self-calibration method principle of the present invention;
Fig. 3 is the realization flow schematic diagram of baseband equipment independent self-calibration method principle of the present invention.
Embodiment
Core concept of the present invention is: the present invention controls FPGA by the CPU of remote equipment self, finishes the calibration of remote equipment to radio frequency and intermediate-frequency section, the result of calibration can be compensated the amplitude between each active channel and the deviation of phase place at remote equipment.And the calculating of finishing channel impulse response in remote equipment is calibration algorithm.Thereby realize the self calibration of remote equipment.In addition, numerical portion is placed on baseband equipment, realizes the self calibration of base station equipment.Like this, need not common compounding practice by remote equipment and baseband equipment, remote equipment/baseband equipment respectively as separate equipment also can control the gain of each antenna voluntarily, the reliability that compensates amplitude between each active channel and the deviation of phase place and the path of finishing the work detects.
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 2, a kind of method of remote equipment independent self-calibration, this method may further comprise the steps:
Method embodiment one is: in the wireless base system, baseband equipment is BBU, and remote equipment is RRU, and wireless base system is in a calibration phase.
Because among the present invention, remote equipment need not to realize calibration that under the cooperation of baseband equipment can realize the independent self-calibration of remote equipment, in the present embodiment, the realization flow of remote equipment independent self-calibration method may further comprise the steps so:
Step 201, RRU judge that whether present frame is to be used to the frame doing to calibrate, if then execution in step 202; Otherwise, execution in step 205.
Here, according to the calibration cycle that is provided with, regularly trigger the transmit operation that is used to the frame doing to calibrate.
The FPGA of the CPU control RRU of step 202, RRU self, send to the operation of eating dishes without rice or wine by FPGA control radio frequency, the intermediate-frequency section and the antenna of will working, finish BBU by of the transmission of work antenna, and this calibrating sequence is sent to the antenna coupling disc fixing calibrating sequence.
After step 203, RRU receive this calibrating sequence by boresight antenna from the antenna coupling disc,, obtain the channel estimation coefficient that each antenna is sent out passage by the channel estimating that the FPGA of RRU realizes sending out passage.
Here, the calibration path is in accepting state when sending out calibrating sequence, and active channel is in transmit status.So, realize that the channel estimating of sending out passage is actually the channel estimating that realizes active channel.
Here, FPGA by RRU in the step 203 realizes that the channel estimating of sending out passage is specially: after the calibration path of RRU is received this calibrating sequence, FPGA by RRU finishes the calculating of doing channel impulse response based on fast fourier transform, thereby obtains the amplitude of every antenna and the deviate of phase place.
Wherein, in FPGA, set in advance calibration algorithm,, in RRU, finished the calculating of channel impulse response according to the calibration algorithm that sets in advance among the FPGA.This calibration algorithm just is based on fast fourier transform and does the algorithm that channel impulse response calculates.
Step 204, each antenna that adds up are sent out the channel estimation coefficient of passage.
The concrete processing procedure of step 204 is: repeatedly add up after the deviate of phase place and amplitude when obtaining each antenna.So that the result after follow-up will the adding up averages, according to resulting mean value, the control by BBU compensates antenna, makes the antenna of respectively working keep same amplitude and phase place.
Whether step 205, judgement are sent out calibration and are finished, if then execution in step 206; Otherwise, change execution in step 201 over to.
After step 206, the channel estimation coefficient that each antenna is sent out passage average, judge the state of current each antenna, and the state of current each antenna reported the antenna coupling disc, the antenna coupling disc is adjusted the angle of antenna, makes the antenna of respectively working keep same amplitude and phase place.
Step 207, RRU adjust downlink data, finish the realization flow of current calibration phase remote equipment independent self-calibration method.
Method embodiment two is: in the wireless base system, baseband equipment is BBU, and remote equipment is RRU, and wireless base system is in the receipts calibration phase.
Because among the present invention, remote equipment need not to realize calibration that under the cooperation of baseband equipment can realize the independent self-calibration of remote equipment, in the present embodiment, in the present embodiment, the realization flow of remote equipment independent self-calibration method may further comprise the steps so so:
Step 301, RRU judge that whether present frame is to be used to the frame doing to calibrate, if then execution in step 302; Otherwise, execution in step 305.
Here, according to the calibration cycle that is provided with, regularly trigger the transmit operation that is used to the frame doing to calibrate.
The FPGA of the CPU control RRU of step 302, RRU self, control radio frequency, intermediate-frequency section and will calibrate antenna transmission by FPGA to the operation of eating dishes without rice or wine, finish BBU by the transmission of boresight antenna, and this calibrating sequence is sent to the antenna coupling disc fixing calibrating sequence.
After step 303, RRU receive this calibrating sequence by the work antenna from the antenna coupling disc,, obtain the channel estimation coefficient that each antenna is received passage by the channel estimating that the FPGA of RRU realizes receiving passage.
Here, active channel is in accepting state when sending out calibrating sequence, and the calibration path is in transmit status.So, realize that the channel estimating of receiving passage is actually the channel estimating that realizes active channel.
Here, FPGA by RRU in the step 303 realizes that the channel estimating of receiving passage is specially: after the active channel of RRU is received this calibrating sequence, FPGA by RRU finishes the calculating of doing channel impulse response based on fast fourier transform, thereby obtains the amplitude of every antenna and the deviate of phase place.
Wherein, in FPGA, set in advance calibration algorithm,, in RRU, finished the calculating of channel impulse response according to the calibration algorithm that sets in advance among the FPGA.This calibration algorithm just is based on fast fourier transform and does the algorithm that channel impulse response calculates.
Step 304, each antenna that adds up are received the channel estimation coefficient of passage.
The concrete processing procedure of step 304 is: repeatedly add up after the deviate of phase place and amplitude when obtaining each antenna.So that the result after follow-up will the adding up averages, according to resulting mean value, the control by BBU compensates antenna, makes the antenna of respectively working keep same amplitude and phase place.
Whether step 305, judgement are received calibration and are finished, if then execution in step 306; Otherwise, change execution in step 301 over to.
After step 306, the channel estimation coefficient that each antenna is received passage average, judge the state of current each antenna, and the state of current each antenna reported the antenna coupling disc, the antenna coupling disc is adjusted the angle of antenna, makes the antenna of respectively working keep same amplitude and phase place.
Step 307, RRU adjust upstream data, finish the realization flow of current receipts calibration phase remote equipment independent self-calibration method.
A kind of system of remote equipment independent self-calibration, this system comprises: alignment unit and compensating unit.Wherein, alignment unit is used for finishing the calibration of remote equipment to radio frequency, intermediate-frequency section after the CPU by remote equipment self controls the FPGA of remote equipment; Calibration result is sent to compensating unit.Compensating unit is after being used for receiving this calibration result from alignment unit, based on this calibration result compensation respectively work the amplitude between the antenna and the deviation of phase place.
Here, alignment unit is further used for finishing the calculating of channel impulse response according to the calibration algorithm that sets in advance among the FPGA in remote equipment.
Among the present invention, baseband equipment need not to cooperate remote equipment to realize calibration function, with calibration function from baseband equipment independent after, can realize the independent self-calibration of baseband equipment, finish self-checking function, the reliability that makes base station equipment can be used for active channel alone detects.Below baseband equipment is used for active channel alone reliability detect and to set forth.
As shown in Figure 3, a kind of baseband equipment independent self-calibration method, this method may further comprise the steps:
DSP unit in step 401, the baseband equipment sends special sequence to remote equipment via the downlink working path; Remote equipment returns to baseband equipment after adding this special sequence to up active channel.
After DSP unit in step 402, the baseband equipment receives the special sequence that remote equipment returns by up active channel, sent between the special sequence that the remote equipment of the special sequence of remote equipment and the current reception in DSP unit returns in the DSP unit, adopt the DSP unit to compare, the reliability of execution work path detects.
Step 403, carry out the prompting of corresponding fault alarm, when orienting the work at present path and be in the physical damage state, take corresponding treatment measures according to different comparison results.
Method embodiment three is: in the wireless base system, baseband equipment is BBU, and remote equipment is RRU, and wireless base system is in the reliability detection-phase of baseband equipment.
So, in the present embodiment, the realization flow of baseband equipment independent self-calibration method may further comprise the steps:
DSP unit among step 501, BBU crack at one's leisure sends special sequence, and BBU sends to RRU by the downlink working path with this special sequence.
Here, special sequence is that the reliability that is used for active channel detects.Comparison between the special sequence that special sequence that sends via the downlink working path by the DSP unit and follow-up DSP unit receive by up active channel, the reliability detection of execution work path.
Here, at special sequence for instance, can transmit 23 32bit data such as present 1.25G optical fiber maximum, 1.25G optical fiber can adopt the special sequence that sends 23 32bit so, and this special sequence can be 0x5a5a5a5a, 5b5b5b, 5c5c5c5c, 0x5d5d5d5d, 0x5e5e5e5e, 0x5f5f5f5f, 0x60606060,0x061616161,0x62626262,0x63636363,0x064646464,0x65656565,0x66666666,0x67676767,0x68686868,0x69696969,0x6a6a6a6a, 0x6b6b6b6b, 0x6c6c6c6c, 0x6d6d6d6d, 0x6e6e6e6e, 0x6f6f6f6f and 0x70707070.
Here, it is pointed out that these a series of special sequences are to adopt basic special sequence 0x5a5a5a5a, add at every turn that 1 pattern generates.
After step 502, RRU stored this special sequence, RRU returned to BBU after adding this special sequence to up active channel.
Step 503, when BBU receives the special sequence that RRU returns via up active channel, this special sequence that returns is sent to DSP unit among the BBU, sent between the special sequence that the RRU of the special sequence of RRU and the current reception in DSP unit returns in the DSP unit, adopt the DSP unit to compare, the reliability of execution work path detects.
If it is consistent that the DSP unit judges has sent to the special sequence that the RRU of the special sequence of RRU and current reception returns, then the reliability by active channel detects, and finishes the flow process of current baseband equipment independent self-calibration; Otherwise the reliability by active channel does not detect execution in step 504.
Step 504, based on the different comparison results that DSP unit comparison is obtained, carry out corresponding fault alarm prompting, when orienting the work at present path and be in the physical damage state, take corresponding treatment measures.Finish the flow process of current baseband equipment independent self-calibration afterwards.
Here, carry out corresponding fault alarm prompting, help in time to orient the physical damage state of active channel, and take corresponding treatment measures according to different comparison results.Comprising three kinds of situations.First kind of situation be, DSP does not receive the unit effective special sequence, and then fault alarm prompting and mark severity level are 1.Second kind of situation be, the special sequence that DSP receives the unit and the special sequence of transmission are incomplete same, and be unequal such as number, and then fault alarm prompting and mark severity level are 2.The third situation is, special sequence that DSP receives the unit and the special sequence of transmission order are inconsistent, and then fault alarm prompting and mark severity level are 3.Severity level is 1,2 and 3 to represent successively decreasing of severity level successively.Severity level is 1 to represent severity level.
Here, at the location of active channel physical damage state, also comprise three kinds of situations.First kind of situation be, the special sequence that DSP receives the unit all is 0, then can orient the work at present path and be in the physical damage state, and the physical damage state is that the active channel of optical fiber or optical module damages, can't carry out the transmitting-receiving of special sequence.So, the treatment measures that adopt this moment are to need to change optical fiber or optical module.Second kind of situation is that special sequence can be received in the DSP unit, then can orient the work at present path and not be in the physical damage state, and the state of work at present path is that optical fiber and optical module are no problem.The third situation is that the special sequence that DSP receives the unit is not exclusively correct, then can orient the work at present path and be in the physical damage state, and be that the problem that the Operation and Maintenance aspect exists has caused the work at present path to be in the physical damage state.So, the treatment measures that adopt this moment are to need to check whether configuration is correct.
A kind of system of baseband equipment independent self-calibration, this system comprises: transmitting element, receiving element and comparing unit.Wherein, transmitting element, the DSP unit that is used for BBU sends special sequence to RRU via the downlink working path.Receiving element after being used for RRU and receiving this special sequence, returns to BBU after adding this special sequence to up active channel.Comparing unit is used for having sent between the special sequence that the RRU of the special sequence of RRU and the current reception in DSP unit returns in the DSP unit, adopts the DSP unit to compare, and the reliability of execution work path detects.
A kind of system of baseband equipment independent self-calibration, this system also comprises: the fault alarm Tip element, after being used for obtaining comparison result, carry out corresponding fault alarm prompting according to different comparison results from comparing unit, and the position of orienting physical damage in the active channel.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1, a kind of method of remote equipment independent self-calibration, it is characterized in that, this method comprises: control the programmable logic controller (PLC) FPGA of described remote equipment by the central processor CPU of remote equipment self, finish the calibration of remote equipment to radio frequency, intermediate-frequency section; Compensate the amplitude of respectively working between the antenna and the deviation of phase place based on the result of described calibration.
2, method according to claim 1 is characterized in that, this method also comprises: according to the calibration algorithm that sets in advance among the described FPGA, finish the calculating of channel impulse response in described remote equipment.
3, method according to claim 1 and 2 is characterized in that, is sending out calibration phase, and this method is specially:
A11, when judging that present frame is the frame that is used to do to calibrate, the CPU of described remote equipment self controls described FPGA and finishes remote equipment by the transmission of work antenna to calibrating sequence, and described calibrating sequence is sent to the antenna coupling disc;
After A12, described remote equipment receive described calibrating sequence by boresight antenna from described antenna coupling disc,, obtain the channel estimation coefficient that each antenna is sent out passage by the channel estimating that described FPGA realizes sending out passage;
A13, the channel estimation coefficient that described each antenna is sent out passage add up and on average, judge the state of current each antenna, and the state of described current each antenna is reported described antenna coupling disc, make the antenna of respectively working keep same amplitude and phase place.
4, method according to claim 1 and 2 is characterized in that, is receiving calibration phase, and this method is specially:
A21, when judging that present frame is the frame that is used to do to calibrate, the CPU of described remote equipment self controls described FPGA and finishes remote equipment by the transmission of boresight antenna to calibrating sequence, and described calibrating sequence is sent to the antenna coupling disc;
After A22, described remote equipment receive described calibrating sequence by the work antenna from described antenna coupling disc,, obtain the channel estimation coefficient that each antenna is received passage by the channel estimating that described FPGA realizes receiving passage;
A23, the channel estimation coefficient that described each antenna is received passage add up and on average, judge the state of current each antenna, and the state of described current each antenna is reported described antenna coupling disc, make the antenna of respectively working keep same amplitude and phase place.
5, a kind of system of remote equipment independent self-calibration is characterized in that, this system comprises: alignment unit and compensating unit; Wherein,
Alignment unit is used for after the CPU by remote equipment self controls the FPGA of described remote equipment, finishes the calibration of remote equipment to radio frequency, intermediate-frequency section; Calibration result is sent to described compensating unit;
Compensating unit, after being used for receiving described calibration result from described alignment unit, respectively work the amplitude between the antenna and the deviation of phase place of compensation based on calibration result.
6, system according to claim 5 is characterized in that, described alignment unit is further used for finishing the calculating of channel impulse response according to the calibration algorithm that sets in advance among the FPGA in described remote equipment.
7, a kind of method of baseband equipment independent self-calibration is characterized in that, this method may further comprise the steps:
Digital Signal Processing DSP unit in B1, the baseband equipment sends special sequence to remote equipment via the downlink working path; Described remote equipment returns to described baseband equipment after adding described special sequence to up active channel;
After DSP unit in B2, the baseband equipment receives the special sequence that remote equipment returns by up active channel, sent between the special sequence that the remote equipment of the special sequence of remote equipment and the current reception in DSP unit returns in the DSP unit, adopt the DSP unit to compare, the reliability of execution work path detects.
8, method according to claim 7 is characterized in that, also comprises behind the step B2:
B3, carry out the prompting of corresponding fault alarm, when orienting the work at present path and be in the physical damage state, take corresponding treatment measures according to different comparison results.
9, a kind of system of baseband equipment independent self-calibration is characterized in that, this system comprises: transmitting element, receiving element and comparing unit; Wherein,
Transmitting element, the DSP unit that is used for baseband equipment sends special sequence to remote equipment via the downlink working path;
Receiving element after being used for described remote equipment and receiving described special sequence, returns to described baseband equipment after adding special sequence to up active channel;
Comparing unit is used for having sent between the special sequence that the remote equipment of the special sequence of remote equipment and the current reception in DSP unit returns in the DSP unit, adopts the DSP unit to compare, and the reliability of execution work path detects.
10, system according to claim 9, it is characterized in that, this system also comprises: the fault alarm Tip element, after being used for obtaining comparison result from described comparing unit, carry out corresponding fault alarm prompting according to different comparison results, and the position of orienting physical damage in the active channel.
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