CN207053510U - A kind of loop gain control system - Google Patents
A kind of loop gain control system Download PDFInfo
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- CN207053510U CN207053510U CN201720825891.3U CN201720825891U CN207053510U CN 207053510 U CN207053510 U CN 207053510U CN 201720825891 U CN201720825891 U CN 201720825891U CN 207053510 U CN207053510 U CN 207053510U
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Abstract
The utility model embodiment provides a kind of loop gain control system, and for carrying out gain control to the downstream signal in mimo system, the system includes：On-site programmable gate array FPGA, feedback channel, processor and M down going channel, M are the positive integer not less than 2；It is controlled by the gain of loop of the processor to being formed by any down going channel and the feedback channel in the FPGA, the M down going channel, realizes the control of the gain to the downstream signal in mimo system.
Description
Technical field
Communication technical field is the utility model is related to, more particularly to a kind of loop gain control system.
Background technology
Multiinputoutput (Multiple-Input Multiple-Out-put, MIMO) technology is mobile communication core skill
One of art, mimo system have very big advantage in the speed of network and quality etc..To mimo system research process
It was found that the general power dynamic range of the downstream signal of existing mimo system output often occur it is critical or even beyond 3gpp the 3rd
For the phenomenon of partner program (3rd Generation Partnership Project, 3gpp) protocol requirement, therefore need
The gain of mimo system downstream signal is controlled.But because the downstream signal of mimo system is by multiple different outputs
Passage exports, so need individually to carry out gain control to each output channel, and prior art can not meet mimo system pair
Multi output passage carries out the demand of gain control respectively.In summary, prior art presence can not be to descending in mimo system
The technical problem that the gain of signal is controlled.
Utility model content
The utility model embodiment provides a kind of loop gain control system, for solve can not be right existing for prior art
The technical problem that the gain of downstream signal in mimo system is controlled.
The utility model embodiment first aspect provides a kind of loop gain control system, under in mimo system
Row signal carries out gain control, and the system includes：Under on-site programmable gate array FPGA, feedback channel, processor and M
Row of channels, M are the positive integer not less than 2；
The FPGA is used for：Baseband signal is handled, forms M railway digital signals, and to the M railway digitals signal point
Not carry out gain amplification, and the M railway digitals signal after gain is amplified exports to the M down going channel respectively；
The first down going channel in the M down going channel is used for：Receive the first railway digital in the M railway digitals signal
Signal, digital-to-analogue conversion is carried out to the first via data signal and gain is amplified, and forms the first radiofrequency signal, first radio frequency
Signal is used to launch downstream signal by antenna, and first down going channel is any down going channel in the M down going channel,
The first via data signal is any data signal in the M railway digitals signal；
The feedback channel is used for：First radiofrequency signal of first down going channel is received, is penetrated to described first
Frequency signal carries out analog-to-digital conversion, forms the first feedback signal, and first feedback signal is exported to the FPGA；
The FPGA is additionally operable to：Determine the forward power of the first via data signal and first feedback signal
Power, the forward power of the first via data signal for the first via data signal without the FPGA Gain tunings when
Power；And the power of the forward power of the first via data signal and first feedback signal is sent to the processing
Device；
The processor, is used for：According to the forward power of the first via data signal and first feedback signal
Power determine the gain of the loop that the FPGA, first down going channel and the feedback channel are formed, the loop
Gain be used for characterize in the mimo system via the first down going channel rear end antenna output downstream signal gain；
And when the gain of the loop exceeds preset range, adjust the gain of the loop.
In such scheme, draw feedback channel from the output end for the down going channel for needing to carry out gain control and connect with FPGA
Connect, by FPGA, need the down going channel of progress gain control and feedback channel to form loop, pass through the inspection to the loop gain
Survey and control, realize the control of the gain of the downstream signal to being exported in mimo system via down going channel rear end antenna,
So as to strictly meet the requirement of 3gpp third generation partner program 3gpp agreements；Meanwhile by different loops
Gain control realizes that the gain of the downstream signal to the output of mimo system difference output channel controls, and meets mimo system to more
Output channel carries out the demand of gain control respectively.
Optionally, the processor is used for when the gain of the loop exceeds preset range, adjusts the increasing of the loop
Benefit, including：When the gain of the loop exceeds the preset range, adjust the FPGA and the first via data signal is entered
The baseband gain of row gain amplification；And/or when the gain of the loop exceeds the preset range, adjustment described first is descending
Passage carries out the rf gain of gain amplification to the first via data signal.It is descending by M using coupler by the manner
The output end of passage is alternatively turned on the input of feedback channel so that different loops are carried out with gain control respectively more just
It is prompt.
Optionally, the processor is used for when the gain of the loop exceeds preset range, adjusts the increasing of the loop
Benefit, including：When the gain of the loop is more than first threshold, reduces the FPGA and the first via data signal is increased
The baseband gain of benefit amplification；And/or when the gain of the loop is more than first threshold, reduce first down going channel to institute
State the rf gain that first via data signal carries out gain amplification.By the manner, can be unsatisfactory in the gain of the first loop
During preset range, to the first loop carry out gain adjustment, and then realize in mimo system via first down going channel
The control of the gain of the downstream signal of rear end antenna output.
Optionally, the processor is used for when the gain of the loop exceeds preset range, adjusts the increasing of the loop
Benefit, including：It is more than the first threshold and when being less than Second Threshold in the gain of the loop, reduces the FPGA to described the
Data signal carries out the baseband gain of gain amplification all the way, and the first threshold is less than the Second Threshold；And/or in the ring
When the gain on road is more than the Second Threshold, reduces first down going channel and first via data signal progress gain is put
Big rf gain.By the manner, the first loop can be increased when the gain of the first loop is unsatisfactory for preset range
The adjustment of benefit, and then realize the gain of the downstream signal to being exported in mimo system via the first down going channel rear end antenna
Control.
Optionally, the system also includes：Coupler, it is used for：By the output end of the M down going channel alternatively with institute
State the input conducting of feedback channel.By the manner, using coupler by the output end of M down going channel alternatively with feedback
The input conducting of passage so that it is more convenient that different loops are carried out with gain control respectively.
Optionally, the processor is additionally operable to：When the gain of the loop meets the preset range, the coupling is indicated
Clutch from the output end of first down going channel is turned on the input of the feedback channel switch to the M is descending
The output end of the second down going channel in passage turns on the input of the feedback channel, and second down going channel is described
Any down going channel in M down going channel in addition to first down going channel；The coupler, is used for：Respond the processing
The instruction of device, switched to from the output end of first down going channel is turned on the input of the feedback channel by the M
The output end of the second down going channel in individual down going channel turns on the input of the feedback channel.Using coupler by M
The output end of down going channel is alternatively turned on the input of feedback channel so that different loops are carried out with gain control respectively more
It is convenient to add.
Optionally, the system also includes：Temperature sensor, it is used for：The temperature parameter of first down going channel is obtained,
And the temperature parameter of first down going channel is sent to the processor；The processor is additionally operable to：Under described first
Before row of channels carries out gain amplification to the first via data signal, determined according to the temperature parameter of first down going channel
First down going channel carries out the rf gain parameter of gain amplification to the first via data signal, and the radio frequency is increased
Beneficial parameter is sent to first down going channel；First down going channel is used to carry out gain to the first via data signal
Amplification, including：Gain is carried out according to the rf gain parameter that the processor is sent to the first via data signal to put
Greatly.By the manner, temperature gain compensation is carried out to down going channel when down going channel carries out Gain tuning to the signal of reception,
So that mimo system under different temperatures environment can stable output power downstream signal, improve the stabilization of mimo system
Property.
Optionally, the system also includes：Temperature sensor, it is used for：Obtain the temperature parameter of first down going channel
And the temperature parameter of the feedback channel, and by the temperature of the temperature parameter of first down going channel and the feedback channel
Degree parameter is sent to the processor；The processor is used for according to the forward power of the first via data signal and described
The power of first feedback signal determines the gain of the loop, including：According to the forward power of the first via data signal, institute
The temperature parameter for stating the power of the first feedback signal, the temperature parameter of first down going channel and the feedback channel determines
The gain of the loop.By the manner, temperature gain compensation is carried out to feedback channel, can more accurately determine loop
Gain so that loop gain control it is more accurate.
The one or more technical schemes provided in the utility model embodiment, at least have the following technical effect that or excellent
Point：
1st, draw feedback channel from the output end for the down going channel for needing to carry out gain control and be connected with FPGA, by
FPGA, need to carry out the down going channel of gain control and feedback channel composition loop, pass through the detection of the gain to the loop
And control, the control of the gain of the downstream signal to being exported in mimo system via down going channel rear end antenna is realized, is made
The requirement of 3gpp third generation partner program 3gpp agreements can strictly be met by obtaining it；Meanwhile by increasing to different loops
Benefit control realizes that the gain of the downstream signal to the output of mimo system difference output channel controls, and meets mimo system to how defeated
Go out the demand that passage carries out gain control respectively.
2nd, the output end of M down going channel is alternatively turned on the input of feedback channel using coupler so that right
It is more convenient that different loops carry out gain control respectively.
3rd, temperature gain compensation is carried out to down going channel and feedback channel so that mimo system under different temperatures environment all
The downstream signal of energy stable output power, improve the stability of mimo system.
Brief description of the drawings
, below will be to needed for embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
The accompanying drawing to be used is briefly introduced, it should be apparent that, drawings in the following description are only the one of the utility model embodiment
A little embodiments, without having to pay creative labor, can also basis for one of ordinary skill in the art
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is the structural representation of the utility model embodiment loop gain control system；
Fig. 2 is the structural representation of the first loop of the utility model embodiment loop gain control system；
Fig. 3 is the schematic diagram of temperature and the relation of the first down going channel change in gain in the utility model embodiment；
Fig. 4 is the flow chart of the utility model embodiment loop gain control method.
Embodiment
The utility model embodiment technical scheme is described in detail below by accompanying drawing and specific embodiment, should
It is to the detailed of the utility model embodiment technical scheme to understand the specific features in the utility model embodiment and embodiment
Explanation, rather than the restriction to the utility model embodiment technical scheme, in the case where not conflicting, the utility model is implemented
Technical characteristic in example and embodiment can be mutually combined.
Embodiment one
The utility model embodiment one provides a kind of loop gain control system, including：Field programmable gate array
(Field-Programmable Gate Array, FPGA) chip, feedback channel, processor and M down going channel, wherein
M is the positive integer not less than 2.
In the utility model embodiment, down going channel refers to Remote Radio Unit (Radio Remote Unit, RRU)
What all solid elements between the signal output part of interior fpga chip and the signal input part of antenna were formed is used to transmit
Be sent to the physical channel of the signal of antenna, feedback channel for antenna signal input part and FPGA feedback signal input terminal it
Between the physical channel of signal for being used to transmit to return from antenna feedback that is formed of all solid elements.
Reference picture 1, internal system structure are：Processor is connected respectively with FPGA, feedback channel and M down going channel；
FPGA first input end is connected by the BUU equipment of optical fiber and base station；FPGA M output end and the M of M down going channel are individual
Input connects one to one；The input of feedback channel and the down going channel that progress gain control is needed in M down going channel
Output end connection and turn on, and at any time, a down going channel is only existed in M down going channel and is led with feedback channel
It is logical；The output end of feedback channel and FPGA the second input connect.
FPGA is used for：Receive what is sent from indoor baseband processing unit (Building Base band Unite, BBU)
Baseband signal, and baseband signal is handled, M railway digital signals are formed, and baseband gain is carried out respectively to M railway digitals signal
Amplification, and the M railway digitals signal after gain is amplified is via FPGA M output end and M input of M down going channel
It is delivered to M down going channel；
M down going channel is used for：The M railway digital signals that FPGA is sent are received, and digital-to-analogue is carried out respectively to M railway digitals signal
Conversion and rf gain amplification, form M roads radiofrequency signal, and M roads radiofrequency signal is sent to antenna, and M roads radiofrequency signal is by day
Line is used to launch downstream signal.Wherein, digital-to-analogue conversion of the down going channel to signal can pass through digital analog converter (Digital to
Analog Converter, DAC) to complete, down going channel can pass through numerical-control attenuator to signal gain amplification
(attenuation, ATT) and power amplifier, which coordinate, to be completed, and radiofrequency signal is exported by power amplifier after rf gain amplification
To antenna, form downstream signal via antenna processing and be sent to space.
Specifically, each down going channel in M down going channel is used to receive its corresponding output end output in FPGA
Data signal, and digital-to-analogue conversion and baseband gain enhanced processing are carried out to it.For example, referring to shown in Fig. 1, FPGA increases base band
It is descending that first via data signal after benefit amplification via the input of its first output end and the first down going channel is delivered to first
Passage, the first down going channel carry out digital-to-analogue conversion and rf gain enhanced processing to it successively after receiving first via data signal,
The first radiofrequency signal is formed, and the first radiofrequency signal is sent to antenna.
Feedback channel is used for：The down going channel for needing to carry out gain control received in M down going channel prepares output extremely
The signal of antenna, and analog-to-digital conversion process is carried out, form feedback signal, and the output by feedback signal via feedback channel
End and FPGA the second input are delivered to FPGA.Wherein feedback channel can pass through analog-to-digital conversion to the analog-to-digital conversion of signal
Device (Analog to Digital Converter, ADC) is completed.The signal that feedback channel receives can need to be increased
The down going channel of benefit control prepares output to whole signals of antenna or needs the down going channel for carrying out gain control accurate
Standby export to the part signal of antenna, the utility model embodiment is not particularly limited.
Wherein, the connected mode of M down going channel and feedback channel includes following two：
1st kind：There was only the output end of down going channel and the input connection of feedback channel in M down going channel and lead
It is logical.
For example, it is assumed that it is the first down going channel in M down going channel to need to carry out the down going channel that gain controls, can adopt
The first down going channel is turned on into connection with feedback channel with coupler.Specifically, processor can be connected with coupler, and by
The input of feedback channel is connected and turned on the output end of the first down going channel by processor instruction coupler；It can also incite somebody to action
FPGA is connected with coupler, and indicates that coupler connects the output end of the input of feedback channel and the first down going channel by FPGA
Connect and turn on；It can also be that coupler is separately provided a control circuit, indicate coupler by feedback channel by the control circuit
Input is connected and turned on the output end of the first down going channel.The utility model embodiment is not done to the main body for controlling coupler
Concrete restriction.
2nd kind：The output end of the input of feedback channel and M down going channel is all connected with, but in M down going channel only
The output end of one down going channel turns on the input of feedback channel.
Such as shown in Fig. 1, it is assumed that need the down going channel that progress gain controls descending logical for first in M down going channel
Road, M output end of M down going channel can be all connected with feedback channel using coupler, but it is descending only to retain first
The output end of passage turns on the input of feedback channel, and other in M down going channel in addition to the first down going channel are descending logical
The output in road is interrupted with the output end of feedback channel, and in Fig. 1, the direction of arrow characterizes the transmission direction of signal.
Specifically, can be connected processor with coupler, and indicate coupler by the input of feedback channel by processor
End turns on the output end of the first down going channel, and the input of feedback channel is descending with removing first in M down going channel
The output end of other down going channels outside passage is interrupted；FPGA can also be connected with coupler, and coupler is indicated by FPGA
The input of feedback channel is turned on the output end of the first down going channel, and the input of feedback channel and M is descending
The output end of other down going channels in passage in addition to the first down going channel is interrupted；Can also be that coupler is separately provided a control
Circuit, the input of feedback channel is turned on the output end of the first down going channel by control circuit instruction coupler, and
The output end of the input of feedback channel and other down going channels in M down going channel in addition to the first down going channel is interrupted.
The utility model embodiment is not particularly limited to the main body for controlling coupler.
FPGA is additionally operable to：It is determined that the signal that the down going channel for carrying out gain control is transmitted is needed to be adjusted without FPGA gains
Power (forward power) when whole, and the signal are sent to after feedback channel through carrying out analog-to-digital conversion institute by feedback channel
The power (i.e. feedback power) of the feedback signal of formation；And forward power and feedback power are sent to processor.
Specifically, FPGA records to the forward power of signal and feedback power that are transmitted on loop, processor is true
During the loop gain of fixed a certain signal, the forward power and feedback power of the signal can be read from record, wherein, FPGA can
To carry out a power statistic to each frame signal, a power statistic, the utility model can also be carried out to every two frame signal
Embodiment is not particularly limited.
Processor is used for：Determine to need to carry out the descending of gain control according to the forward power and feedback power received
The gain for the loop that passage, feedback channel and FPGA are formed, the gain of the loop are used to characterize to pass through in the mimo system
By the gain of the downstream signal of down going channel rear end antenna output；And when the gain of loop exceeds preset range, adjust
The gain on domain road.Preset range determines according to the requirement of 3gpp agreements.
Wherein, processor specific implementation can be microprocessor (Advanced RISC Machines, ARM), number
Word signal processor (Digital Signal Processing, DSP) and microcontroller ((Micro Controller
Unit, MCU) etc., the utility model embodiment is not particularly limited.Processor, which is monitored and adjusted to loop gain, to be passed through
Program software is realized, for example, processor is specially arm processor, installation operation management and maintenance in arm processor
(Operation Administration and Maintenance, OAM) program software, pass through the realization pair of OAM program softwares
Control to FPGA, feedback channel and M down going channel.
Next, the utility model embodiment is to need to carry out the down going channel that controls of gain as in M down going channel
Exemplified by first down going channel, the process for carrying out gain control to loop to processor is described in detail.
Shown in reference picture 2, FPGA, the first down going channel, coupler and feedback channel form the first loop, it is assumed that first
The preset range of the gain of loop is [g4, g1], and wherein g4 is the 4th threshold value of the gain of the first loop, and g1 is the first loop
The first threshold of gain, g4<g1.The forward power P1 and feedback power P2 that processor is sent according to FPGA determine current first
The actual gain of loop is G=P2-P1.Processor carries out the method that gain controls to the first loop：Processor is to current
The actual gain of one loop is judged, the gain parameter of the first loop is adjusted when actual gain is unsatisfactory for preset range, directly
Untill the first loop gain meets preset range, specific method of adjustment is as follows：
If G>G1, processor, which controls, reduces the baseband gain that FPGA carries out gain amplification to first via data signal, and/
Or reduce the rf gain that the first down going channel carries out gain amplification to first via data signal；Wherein, the first down going channel pair
The rf gain that first via data signal carries out gain amplification refers specifically to：First down going channel is to first via data signal through digital-to-analogue
The radiofrequency signal formed after converter processing carries out the rf gain of gain amplification；
If G<G4, processor, which controls, increases the baseband gain that FPGA carries out gain amplification to first via data signal, and/
Or the first down going channel of increase carries out the rf gain of gain amplification to first via data signal；
If g4=<G=<G1, processor stop to the Gain tuning of the first loop, instruction coupler by feedback channel with
First down going channel is interrupted, and feedback channel is turned on the second down going channel, is started to FPGA, the second down going channel, coupling
Device and feedback channel form the second loop and carry out gain control.
In specific implementation process, in G>, can be further to judge the specific scopes of G during g1, and take different tune
Perfect square formula.Specifically, can be in G>Second Threshold g2 and the 3rd threshold value g3, wherein g1 are set on the basis of g1<g2<G3, place
The adjustment mode that device is managed to loop gain is including but not limited to following three kinds：
The first, in g1<G<During g2, reduce the baseband gain that FPGA carries out gain amplification to first via data signal, its
Middle g2 is the Second Threshold of the gain of the first loop；
Second, in g2<G<During g3, increase the attenuation parameter of the numerical-control attenuator ATT in the first down going channel, wherein g3
For the 3rd threshold value of the gain of the first loop；
The third, g3<During G, the power amplifier function of the first down going channel intermediate power amplifier is closed, and to the first down going channel
Carry out the excessive alarm of power.
In specific implementation process, in G<, can be further to judge the specific scopes of G during g4, and take different tune
Perfect square formula.Specifically, can be in G<The 5th threshold value g5 and the 6th threshold value g6, wherein g6 are set on the basis of g4<g5<G4, place
The adjustment mode that device is managed to loop gain is including but not limited to following three kinds：
The first, in g5<G<During g4, increase FPGA carries out the baseband gain of gain amplification to first via data signal, its
Middle g5 is the 5th threshold value of the gain of the first loop；
Second, in g6<G<During g5, reduce the attenuation parameter of the numerical-control attenuator ATT in the first down going channel, wherein g3
For the 5th threshold value of the gain of the first loop；
The third, G<During g6, stop Power Control of the processor to the first loop, and power is carried out to the first down going channel
Too small alarm.
Wherein, Second Threshold g2 and the 5th threshold value g5 design parameter value by the first loop gain calibration gain g0 and
Numerical-control attenuator ATT stepping attenuation parameter X is determined：G5=g0-X, g2=g0+X.Gain g0 is calibrated to meet：g4<=g0<=
g1。
In such scheme, gain control system draws feedback from the output end for the down going channel for needing to carry out gain control
Passage is simultaneously connected with FPGA, by FPGA, needs the down going channel of progress gain control and feedback channel to form loop, by right
The detection and control of the loop gain, realize the downstream signal to being exported in mimo system via down going channel rear end antenna
Gain control so that it can strictly meet the requirement of 3gpp third generation partner program 3gpp agreements；Meanwhile pass through
The gain of downstream signal to the output of mimo system difference output channel, which controls, to be realized to different loop gain control, is met
Mimo system carries out the demand of gain control to multi output passage respectively；Moreover, using coupler by M down going channel
Output end is alternatively turned on the input of feedback channel so that it is more convenient that different loops are carried out with gain control respectively.
In actual applications, temperature also influences whether that equipment carries out the accuracy of Gain tuning to signal when equipment is run,
In order that mimo system under different temperatures environment can stable output power downstream signal, it is necessary to down going channel carry out
Temperature gain compensation.Wherein, the temperature gain compensation of down going channel can carry out gain to the signal of reception in down going channel
Adjustment is carried out, and can also be carried out when gain of the processor to loop regulates and controls, the utility model embodiment is not limited.
(1) processor carries out Gain tuning to the signal of reception in down going channel and carries out temperature gain compensation to down going channel
Concrete methods of realizing：
Optionally, the system can also include temperature sensor, need to carry out the descending logical of gain control for obtaining
The temperature parameter in road, and the temperature parameter of the down going channel is sent to processor；Processor is additionally operable to：Needing to carry out gain
Before the data signal that the down going channel of control receives to it carries out gain amplification, determined according to the temperature parameter of the down going channel
Data signal that the down going channel receives to it carries out the rf gain parameter of gain amplification, and by rf gain parameter send to
The down going channel so that the rf gain parameter that the down going channel is sent according to processor increases to the data signal that it is received
Benefit amplification.
Next, still exemplified by needing to carry out the down going channel that controls of gain and be the first down going channel, to down going channel
Temperature gain compensation be described in detail：
Specifically, the temperature sensor is used for the temperature parameter for obtaining the first down going channel, and by the first down going channel
Temperature parameter send to processor；Processor is additionally operable to：Gain is carried out in the first down going channel to first via data signal to put
Before big, determine that the first down going channel carries out gain amplification to first via data signal according to the temperature parameter of the first down going channel
Rf gain parameter, and rf gain parameter is sent to the first down going channel；First down going channel is used for the first way
Word signal carries out gain amplification, including：Gain is carried out to first via data signal according to the rf gain parameter that processor is sent
Amplification.
In specific implementation process, influence that can be in advance to gain of the different temperatures to down going channel counts, raw
Into a descending temperature compensation table.Processor is before the first down going channel carries out gain amplification to first via data signal, according to the
The temperature parameter of one down going channel reads change in gain Δ C corresponding to the temperature parameter from descending temperature compensation table, and by under first
The rf gain parameter K0 that row of channels carries out gain amplification to first via data signal is modified, the rf gain corrected
Parameter K0- Δ C, and the rf gain parameter K0- Δs C of the amendment is sent to the first down going channel；First down going channel according to
The rf gain parameter K0- Δs C for the amendment that processor is sent carries out gain amplification to first via data signal.
Wherein, the manufacturing process of descending temperature compensation table is as follows：Keep FPGA and all configuration parameters of the first down going channel constant,
Keep the power of the first via data signal of FPGA outputs constant, once temperature is carried out every certain temperature value to the first down going channel
Degree sampling, in the power of the first radiofrequency signal of different temperature spot record antenna openings, the interval of sample temperature is according to actual feelings
Depending on condition, the utility model embodiment is not particularly limited.Relative value of each temperature spot relative to reference temperature is obtained, according to
Each temperature spot and each temperature spot obtain the functional relation of temperature and change in gain, root relative to the relative value of reference temperature
Descending temperature compensation table is generated according to the functional relation.
For example, in -40 DEG C to+60 DEG C of environment temperature, processor indicates temperature sensor at interval of 10 DEG C to first
The temperature of down going channel is sampled, and the power of the first via data signal in the holding FPGA outputs of all sample points is phase
With value；Processor obtains the power of the first radiofrequency signal of antenna opening under each sample temperature, obtains the first of each temperature spot
The power of radiofrequency signal relative to the power of the first radiofrequency signal under reference temperature relative value；By sample temperature and relative value system
Data form is made, obtains functional relation of the temperature to the change in gain of the first down going channel.Shown in reference picture 3, horizontal seat in figure
Temperature T is designated as, ordinate is the power C of the first radiofrequency signal, and Δ C1 is that the power of the first radiofrequency signal when temperature is T1 is relative
The relative value of the power of the first radiofrequency signal when reference temperature T0, i.e. temperature T1 become to gain caused by the first down going channel
Change.
In specific implementation process, in order that the functional relation that must obtain temperature and the change in gain of down going channel more may be used
Lean on, more stylobate station equipments can also be used to carry out data sampling, then the average value of the data of more stylobate station equipments obtains temperature
To the functional relation of the change in gain of down going channel.
By the manner, Gain tuning is carried out to the signal of reception in down going channel temperature gain benefit is carried out to down going channel
Repay so that mimo system under different temperatures environment can stable output power downstream signal, improve the steady of mimo system
It is qualitative.
Likewise, temperature also can bring gain effects to feedback channel, the increasing brought for correcting temperature to loop gain
Benefit change to feedback channel, it is necessary to carry out temperature gain compensation.
Optionally, the temperature sensor is additionally operable to obtain the temperature parameter of feedback channel, and by the feedback channel
Temperature parameter is sent to the processor；The processor is used to determine need according to the forward power and feedback power that receive
The gain of the loop of down going channel, feedback channel and the FPGA formation of gain control is carried out, including：According to forward power,
The temperature parameter of feedback power and feedback channel determines the gain of the loop.
Next, still exemplified by needing to carry out the down going channel that controls of gain and be the first down going channel, to feedback channel
Temperature gain compensation be described in detail：
The temperature sensor is used for the temperature parameter for obtaining feedback channel, and the temperature parameter of feeding back downlink passage is sent out
Deliver to processor；Processor is additionally operable to the temperature parameter according to the feeding back downlink passage received, before first via data signal
The first loop of the first down going channel, feedback channel and FPGA formation is determined to the power of power and the first feedback signal
Gain.
Specifically, influence that can be in advance to gain of the different temperatures to feedback channel counts, a feedback is generated
Temperature compensation table.When processor determines the gain of the first loop, being read according to the temperature parameter of feedback channel from feedback temperature compensation table should
Change in gain Δ C2 corresponding to temperature parameter is then anti-according to the forward power P3 and first for receiving first via data signal
The power P 4 of feedback signal, and change in gain Δ C2 determine the gain of the first loop：G1=P4-P3- Δs C2.
Wherein, the manufacturing process for feeding back temperature compensation table is as follows：The first down going channel is kept to export the first radio frequency letter to antenna
Number power it is constant, temperature sampling is carried out every certain temperature value to feedback channel, feedback is recorded in different temperature spot
The power of first feedback signal of passage output, the interval of sample temperature is depending on actual conditions, the utility model embodiment
It is not particularly limited.Relative value of each temperature spot relative to reference temperature is obtained, according to each temperature spot and each temperature
Point obtains the functional relation of temperature and change in gain relative to the relative value of reference temperature, and descending temperature is generated according to the functional relation
Mend table.Embodiment is referred to the making manufacturing process of descending temperature compensation table, no longer herein to illustrate more.
In order that the functional relation that must obtain temperature and the change in gain of feedback channel is relatively reliable, more stylobates can be used
Station equipment carries out data sampling, and then the average value of the data of more stylobate station equipments obtains change in gain of the temperature to feedback channel
Functional relation.
By the manner, temperature gain compensation is carried out to feedback channel, can more accurately determine the gain of loop,
So that loop gain control is more accurate.
(2) processor carries out the specific implementation of temperature gain compensation when the gain to loop regulates and controls to down going channel
Method：
Optionally, the system can also include temperature sensor, need to carry out the descending logical of gain control for obtaining
The temperature parameter in road, the temperature parameter of feedback channel, and the temperature parameter of the temperature parameter of the down going channel, feedback channel is sent out
Deliver to processor；The processor is used to determine to need to carry out gain control according to the forward power and feedback power that receive
Down going channel, the gain of loop that is formed of feedback channel and FPGA, including：According to forward power, feedback power, need into
The temperature parameter of down going channel and the temperature parameter of feedback channel of row gain control determine the gain of the loop.
Next, still exemplified by needing to carry out the down going channel that controls of gain and be the first down going channel, to down going channel
Temperature gain compensation be described in detail：
Specifically, can the influence to gain of the different temperatures to feedback channel in advance and the gain to the first down going channel
Influence counted respectively, generate a descending temperature compensation table and one feedback temperature compensation table.Descending temperature compensation table and feedback temperature compensation table
Preparation method be referred to the specific implementation of the descending temperature compensation table of making and feedback temperature compensation table described in above mode (1)
Journey, no longer repeated herein.
Forward power P5 of the processor according to the first via data signal received, the first feedback signal power P 6, first
The temperature parameter Δ C3 of the down going channel and temperature parameter Δ C4 of feedback channel determines the gain of the first loop：G2=P6-P5-
ΔC3-ΔC4；Gain of the processor when the gain of the first loop is unsatisfactory for the preset range to the first loop is adjusted；
Processor is after the Gain tuning to the first loop, according to the temperature parameter Δ C3 of the first down going channel to the first down going channel
The rf gain parameter that gain amplification is carried out to first via data signal is adjusted.
By the manner, temperature gain compensation, Ke Yigeng are carried out to down going channel when the gain to loop regulates and controls
Add the gain for accurately determining out loop so that mimo system under different temperatures environment can stable output power descending letter
Number, improve the stability of mimo system.
Embodiment two
The utility model embodiment two provides a kind of down going channel gain control method, and it is more that methods described is applied to multi input
Mimo system is exported, the mimo system includes FPGA, feedback channel, processor and M down going channel, and M is not less than 2
Positive integer；Reference picture 4, methods described includes：
Step 11, baseband signal is handled by the FPGA, forms M railway digital signals, and to the M railway digitals
Signal carries out gain amplification respectively, and the M railway digitals signal after gain is amplified export respectively to the M it is descending logical
Road；
Step 12, first in the M railway digitals signal is received by the first down going channel in the M down going channel
Railway digital signal, digital-to-analogue conversion and gain are carried out to the first via data signal and amplified, form the first radiofrequency signal, described the
One radiofrequency signal is used to launch downstream signal by antenna, and first down going channel is under any in the M down going channel
Row of channels, the first via data signal are any data signal in the M railway digitals signal；
Step 13, first radiofrequency signal of first down going channel is received by the feedback channel, to described
First radiofrequency signal carries out analog-to-digital conversion, forms the first feedback signal, and first feedback signal is exported to the FPGA；
Step 14, the forward power of the first via data signal and first feedback letter are determined by the FPGA
Number power, the forward power of the first via data signal is the first via data signal without the FPGA Gain tunings
When power；And the power of the forward power of the first via data signal and first feedback signal is sent to described
Processor；
Step 15, forward power of the processor according to the first via data signal and first feedback are passed through
The power of signal determines the gain for the loop that the FPGA, first down going channel and the feedback channel are formed, described
The gain of loop is used to characterize the gain of the downstream signal via the output of down going channel rear end antenna in the mimo system；
And when the gain of the loop exceeds preset range, adjust the gain of the loop.
Optionally, it is described the preset range is exceeded in the gain of the loop by the processor when, adjust institute
The gain of loop is stated, including：
By the processor when the gain of the loop exceeds the preset range, the FPGA is adjusted to described
Data signal carries out the baseband gain of gain amplification all the way；And/or
By the processor when the gain of the loop exceeds the preset range, first down going channel is adjusted
The rf gain of gain amplification is carried out to the first via data signal.
Optionally, it is described by the processor when the gain of the loop exceeds the preset range, described in adjustment
The gain of loop, including：
By the processor when the gain of the loop is more than first threshold, increase the FPGA to the first via
Data signal carries out the baseband gain of gain amplification；And/or
By the processor when the gain of the loop is more than first threshold, reduce first down going channel to institute
State the rf gain that first via data signal carries out gain amplification.
Optionally, it is described by the processor when the gain of the loop exceeds the preset range, described in adjustment
The gain of loop, including：
By the processor when the gain of the loop is more than the first threshold and is less than Second Threshold, reduce institute
The baseband gain that FPGA carries out gain amplification to the first via data signal is stated, the first threshold is less than second threshold
Value；And/or
By the processor when the gain of the loop is more than the Second Threshold, reduce first down going channel
The rf gain of gain amplification is carried out to the first via data signal.
Optionally, the system also includes coupler, and methods described also includes：
Input of the output end of the M down going channel alternatively with the feedback channel is led by the coupler
It is logical.
Optionally, methods described also includes：The preset range is met in the gain of the loop by the processor
When, indicate that the coupler is switched to from the output end of first down going channel is turned on the input of the feedback channel
The output end of the second down going channel in the M down going channel is turned on the input of the feedback channel, described second
Down going channel is any down going channel in addition to first down going channel in the M down going channel；
The instruction of the processor is responded by the coupler, from by the output end of first down going channel with it is described
The input conducting of feedback channel is switched to the output end of the second down going channel in the M down going channel and the feedback
The input conducting of passage.
Optionally, the system also includes temperature sensor；By first down going channel to first way
Before word signal carries out gain amplification, methods described also includes：
Obtain the temperature parameter of first down going channel by the temperature sensor, and by first down going channel
Temperature parameter send to the processor；
Determine first down going channel to institute according to the temperature parameter of first down going channel by the processor
State first via data signal and carry out the parameter of gain amplification, and the parameter is sent to first down going channel；
It is described that gain amplification is carried out to the first via data signal by first down going channel, including：Pass through institute
State the first down going channel and gain amplification is carried out to the first via data signal according to the parameter that the processor is sent.
Optionally, the system also includes temperature sensor；Believed by the processor according to first railway digital
Number forward power and first feedback signal power determine the gain of the loop before, methods described also includes：
The temperature parameter of first down going channel and the temperature of the feedback channel are obtained by the temperature sensor
Parameter is spent, and the temperature parameter of the temperature parameter of first down going channel and the feedback channel is sent to the processing
Device；
It is described to pass through forward power of the processor according to the first via data signal and first feedback letter
Number power determine the gain of the loop, including：Forward direction work(by the processor according to the first via data signal
Rate, the power of first feedback signal, the temperature ginseng of the temperature parameter of first down going channel and the feedback channel
Number determines the gain of the loop.
The one or more technical schemes provided in the utility model embodiment, at least have the following technical effect that or excellent
Point：
1st, draw feedback channel from the output end for the down going channel for needing to carry out gain control and be connected with FPGA, by
FPGA, need to carry out the down going channel of gain control and feedback channel composition loop, pass through the detection of the gain to the loop
And control, the control of the gain of the downstream signal to being exported in mimo system via down going channel rear end antenna is realized, is made
The requirement of 3gpp third generation partner program 3gpp agreements can strictly be met by obtaining it；Meanwhile by increasing to different loops
Benefit control realizes that the gain of the downstream signal to the output of mimo system difference output channel controls, and meets mimo system to how defeated
Go out the demand that passage carries out gain control respectively.
2nd, the output end of M down going channel is alternatively turned on the input of feedback channel using coupler so that right
It is more convenient that different loops carry out gain control respectively.
3rd, temperature gain compensation is carried out to down going channel and feedback channel so that mimo system under different temperatures environment all
The downstream signal of energy stable output power, improve the stability of mimo system.
It should be understood by those skilled in the art that, the embodiment of the utility model embodiment can be provided as method, system or
Computer program product.Therefore, the utility model embodiment can use complete hardware embodiment, complete software embodiment or knot
The form of embodiment in terms of conjunction software and hardware.Wherein wrapped in one or more moreover, the utility model embodiment can use
Computer-usable storage medium containing computer usable program code (includes but is not limited to magnetic disk storage, CD-ROM, optics
Memory etc.) on the form of computer program product implemented.
The utility model embodiment is with reference to the method, equipment (system) and computer according to the utility model embodiment
The flow chart and/or block diagram of program product describes.It should be understood that can be by computer program instructions implementation process figure and/or side
Each flow and/or square frame in block diagram and the flow in flow chart and/or block diagram and/or the combination of square frame.It can provide
These computer program instructions are set to the processing of all-purpose computer, special-purpose computer, Embedded Processor or other programmable datas
Standby processor is to produce a machine so that passes through the computing device of computer or other programmable data processing devices
Instruction produces specifies for realizing in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames
Function device.
Obviously, those skilled in the art can to the utility model embodiment carry out it is various change and modification without departing from
The spirit and scope of the utility model embodiment.So, if these modifications and variations of the utility model embodiment belong to this
Within the scope of utility model embodiment claim and its equivalent technologies, then the utility model embodiment is also intended to include these
Including change and modification.
Claims (8)
1. a kind of loop gain control system, it is characterised in that for entering to the downstream signal in Multiinputoutput mimo system
Row gain controls, and the system includes：On-site programmable gate array FPGA, feedback channel, processor and M down going channel, M
For the positive integer not less than 2；
The FPGA is used for：Baseband signal is handled, forms M railway digital signals, and the M railway digitals signal is entered respectively
Row gain is amplified, and the M railway digitals signal after gain is amplified exports to the M down going channel respectively；
The first down going channel in the M down going channel is used for：Receive the first railway digital letter in the M railway digitals signal
Number, digital-to-analogue conversion is carried out to the first via data signal and gain is amplified, forms the first radiofrequency signal, the first radio frequency letter
Number it is used to launch downstream signal by antenna, first down going channel is any down going channel in the M down going channel, institute
First via data signal is stated as any data signal in the M railway digitals signal；
The feedback channel is used for：First radiofrequency signal of first down going channel is received, first radio frequency is believed
Number analog-to-digital conversion is carried out, form the first feedback signal, and first feedback signal is exported to the FPGA；
The FPGA is additionally operable to：Determine the forward power of the first via data signal and the work(of first feedback signal
Rate, the forward power of the first via data signal for the first via data signal without the FPGA Gain tunings when work(
Rate；And the power of the forward power of the first via data signal and first feedback signal is sent to the processing
Device；
The processor, is used for：According to the forward power of the first via data signal and the work(of first feedback signal
Rate determines the gain for the loop that the FPGA, first down going channel and the feedback channel are formed, the increasing of the loop
Benefit is used to characterize the gain of the downstream signal via the first down going channel rear end antenna output in the mimo system；And
When the gain of the loop exceeds preset range, the gain of the loop is adjusted.
2. the system as claimed in claim 1, it is characterised in that the processor is used for the gain in the loop beyond predetermined
During scope, the gain of the loop is adjusted, including：
When the gain of the loop exceeds the preset range, adjust the FPGA and the first via data signal is increased
The baseband gain of benefit amplification；And/or
When the gain of the loop exceeds the preset range, adjust first down going channel and first railway digital is believed
Number carry out gain amplification rf gain.
3. the system as claimed in claim 1, it is characterised in that the processor is used for the gain in the loop beyond predetermined
During scope, the gain of the loop is adjusted, including：
When the gain of the loop is more than first threshold, reduces the FPGA and first via data signal progress gain is put
Big baseband gain；And/or
When the gain of the loop is more than first threshold, reduces first down going channel and the first via data signal is entered
The rf gain of row gain amplification.
4. system as claimed in claim 3, it is characterised in that the processor is used for the gain in the loop beyond predetermined
During scope, the gain of the loop is adjusted, including：
When the gain of the loop is more than the first threshold and is less than Second Threshold, reduce the FPGA to the first via
Data signal carries out the baseband gain of gain amplification, and the first threshold is less than the Second Threshold；And/or
When the gain of the loop is more than the Second Threshold, reduces first down going channel and first railway digital is believed
Number carry out gain amplification rf gain.
5. the system as described in claim any one of 1-4, it is characterised in that the system also includes：
Coupler, it is used for：Input of the output end of the M down going channel alternatively with the feedback channel is turned on.
6. system as claimed in claim 5, it is characterised in that the processor is additionally operable to：Meet in the gain of the loop
During the preset range, indicate the coupler from by the input of the output end of first down going channel and the feedback channel
End conducting, which switches to, leads the output end of the second down going channel in the M down going channel and the input of the feedback channel
Logical, second down going channel is any down going channel in addition to first down going channel in the M down going channel；
The coupler, is used for：Respond the instruction of the processor, from by the output end of first down going channel with it is described anti-
The input conducting in feedthrough road switches to the output end of the second down going channel in the M down going channel and the feedback is logical
The input conducting in road.
7. the system as described in claim any one of 1-4, it is characterised in that the system also includes：
Temperature sensor, it is used for：Obtain the temperature parameter of first down going channel, and by the temperature of first down going channel
Parameter is sent to the processor；
The processor is additionally operable to：Before first down going channel carries out gain amplification to the first via data signal,
Determine that first down going channel increases to the first via data signal according to the temperature parameter of first down going channel
The rf gain parameter of benefit amplification, and the rf gain parameter is sent to first down going channel；
First down going channel is used to carry out gain amplification to the first via data signal, including：According to the processor
The rf gain parameter sent carries out gain amplification to the first via data signal.
8. the system as described in claim any one of 1-4, it is characterised in that the system also includes：
Temperature sensor, it is used for：The temperature parameter of first down going channel and the temperature parameter of the feedback channel are obtained,
And the temperature parameter of the temperature parameter of first down going channel and the feedback channel is sent to the processor；
The processor is used for according to the forward power of the first via data signal and the power of first feedback signal
The gain of the loop is determined, including：According to the forward power of the first via data signal, the work(of first feedback signal
The temperature parameter of rate, the temperature parameter of first down going channel and the feedback channel determines the gain of the loop.
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|---|---|---|---|
| CN201720825891.3U CN207053510U (en) | 2017-07-07 | 2017-07-07 | A kind of loop gain control system |
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| CN201720825891.3U CN207053510U (en) | 2017-07-07 | 2017-07-07 | A kind of loop gain control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276647A (en) * | 2017-07-07 | 2017-10-20 | 京信通信系统（中国）有限公司 | A kind of loop gain control system and method |
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2017
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276647A (en) * | 2017-07-07 | 2017-10-20 | 京信通信系统（中国）有限公司 | A kind of loop gain control system and method |
| CN107276647B (en) * | 2017-07-07 | 2023-10-10 | 京信网络系统股份有限公司 | Loop gain control system and method |
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Address after: 510663 No.10, Shenzhou Road, Guangzhou Science City, economic and Technological Development Zone, Huangpu District, Guangzhou City, Guangdong Province Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 No.10, Shenzhou Road, Guangzhou Science City, economic and Technological Development Zone, Huangpu District, Guangzhou City, Guangdong Province Patentee before: COMBA TELECOM SYSTEMS (CHINA) Ltd. |
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