CN109120318A - The circuit structure of local oscillator driving function is realized based on extensive MIMO technique - Google Patents
The circuit structure of local oscillator driving function is realized based on extensive MIMO technique Download PDFInfo
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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Abstract
The present invention relates to a kind of circuit structures that local oscillator driving function is realized based on extensive MIMO technique, including local oscillator module, for generating high-power RF signal；First driving circuit, the input terminal of first driving circuit are connected with the output end of the local oscillator module, for the signal constant amplitude of the local oscillator module to be mutually divided into together eight road signals；Second driving circuit group, including 8 identical second driving circuits, the input terminal of 8 second driving circuits is connected with the output end of eight tunnel output signals of first driving circuit respectively, for by the signal constant amplitude of first driving circuit with phase branch.Using the system and method, solve Massive mimo channel simulator local oscillator how assignment problem, local oscillator driving power size issue, local oscillator input phase consistency problem, keep the planning of local oscillation signal and structure distribution reasonable, it is designed with good structure, and cost is effectively controlled, there is extensive prospect of the application.
Description
Technical field
The present invention relates to instrument fields, more particularly to extensive multiple-input and multiple-output instrument field, in particular to one
Kind realizes the circuit structure of local oscillator driving function based on extensive MIMO technique.
Background technique
With the development of communication technology, data volume caused by people's daily life increasingly increases, smart home, artificial intelligence
The technologies such as energy and virtual reality have entered into or will enter into our life, it is followed by that data traffic requirement
Sharp increase.Existing 4G mobile communication will be unable to meet so huge data traffic transmission demand, therefore study a new generation
5G technology will be at key to solve this problem.
The key technology of 5G mobile communication mainly has the Radio Transmission Technology and high-density wireless network technology of ultra high performance.
Mainly there are Massive MIMO (extensive multiple-input and multiple-output) technology, full duplex technology and millimeter in terms of Radio Transmission Technology
Communication techniques；Mainly there are super-intensive heterogeneous network technologies, software definition wireless network in terms of radio network technique and from group
Knit network technology.
As the effective means for improving the availability of frequency spectrum and transmission reliability, MIMO technology has been used to LTE and WIFI etc.
Various wireless communication system.In general, the antenna number of transceiver assembly is more, and spectrum efficiency and channel reliability just might as well.
Base station is made multiple signals carry out in-phase stacking in receiving end, is connect to reach raising by the phase of separately adjustable every antenna
Receive the purpose of signal strength.
Massive MIMO technology is not only can promotion nothing at double by increasing the quantity of antenna in base station
The communication performance of line communication, this technology are that the system spectrum that can be improved that one kind is novel in mobile cellular net wireless communication system provides
The network design framework of source utilization rate and capacity usage ratio.
Massive mimo channel simulator is a kind of instrument as simulation Massive MIMO technology, can be simulated true
Multipath fading, delay extension, Doppler's decline in the real space etc. influence the characteristic of communication quality, to study and simulating
Massive MIMO technology provides good channel model.
It is based on a kind of 5G Massive mimo channel simulator herein, this channel simulator is 128 × 8 matrix channel moulds
Quasi- device, has 136 transceiver channels, that is, needs 136 local oscillators to drive each channel, how to give in 136 channels local oscillators are provided
Signal becomes the solution main points of this paper.
Summary of the invention
The purpose of the present invention is overcoming the above-mentioned prior art, provide a kind of using multichannel centimetre combination shape
Formula has interpolation amplifier, realizes local oscillator driving function based on extensive MIMO technique with symmetric form
Circuit structure.
To achieve the goals above, of the invention that local oscillator driving function is realized based on extensive MIMO technique
Circuit structure is as follows:
This realizes the circuit structure of local oscillator driving function based on extensive MIMO technique, is mainly characterized by,
The system includes:
Local oscillator module, for generating high-power RF signal；
First driving circuit, the input terminal of first driving circuit are connected with the output end of the local oscillator module
It connects, for the signal constant amplitude of the local oscillator module to be mutually divided into together eight road signals；
Second driving circuit group, including 8 identical second driving circuits, the input of 8 second driving circuits
End is connected with the output end of eight tunnel output signals of first driving circuit respectively, for by first driving circuit
Signal constant amplitude is the same as phase branch.
Preferably, the local oscillator module includes numerical-control attenuator, for the different frequency signals power progress to output
It adjusts.
Preferably, the range of the numerical-control attenuator is 0 to 15dB.
Preferably, first driving circuit include one point of eight power divider, and one point of eight power divider with
The local oscillator module is connected.
Preferably, second driving circuit includes:
First amplifier, the input terminal of first amplifier are connected with the output end of first driving circuit
It connects, for amplifying the input signal of the second driving circuit；
One point of nine wideband power distributor, the input terminal of one point of nine wideband power distributor are put with described first
The output end of big device is connected, for the signal for passing through the first amplifier to be divided into nine road signals；
Second amplifier group, including 9 the second amplifiers, the input terminal of 9 second amplifiers respectively with it is described
The output end of nine tunnel output signals of one point of nine wideband power distributor be connected, for will be by one point of nine broadband power point
The signal of orchestration amplifies；
One-to-two power divider group, including 9 one-to-two power dividers, 9 one-to-two power dividers
Input terminal be connected respectively with the output end of 9 second amplifiers, for the signal of the second amplifier group will to be passed through
It halves.
Preferably, the gain of first amplifier is 15dB, the insertion of one point of nine wideband power distributor
Loss is not more than 16dB, and the gain of the second amplifier group is 18dB, the insertion of the one-to-two power divider group
Loss is not more than 4dB.
Preferably, one point of nine wideband power distributor includes that two-stage one divides three unequal power distributors, with
The output end of first amplifier is connected.
Preferably, one point of three unequal power distributor uses symmetric form, and this point three not equal part power
The microstrip line form of three road signals of distributor is essentially identical.
Preferably, first driving circuit and the second driving circuit group is all made of second order quarter-wave microstrip line
Carry out impedance transformation.
Preferably, it is characterized in that, the microstrip line carries out two-stage impedance transformation in the changeover portion of narrow road microstrip line.
Preferably, it is characterized in that, the output signal of the local oscillator module is transmitted to described the by radio-frequency cable
The output signal of one drive circuit, first driving circuit is transmitted to second driving circuit by radio-frequency cable
Group.
Preferably, it is characterized in that, the hertz for the local oscillation signal that the local oscillator module is generated by high stable crystal oscillator not
Less than 7.5GHz and it is not more than 13.5GHz, harmonic wave is better than -40dBc, and power is not less than 14dBm.
Preferably, it is characterized in that, the power of the output signal of first driving circuit is not less than -1dBm.
Preferably, it is characterized in that, the insertion loss of first driving circuit is not more than 15dB.
Preferably, it is characterized in that, the power of the output signal of the second driving circuit group is not less than 15dBm.
The circuit structure for realizing local oscillator driving function based on extensive MIMO technique using this, by base
Stand place increase antenna quantity can at double promotion wireless communication communication performance, be mobile cellular net wireless communication system
The novel network design framework that can be improved system spectral resources utilization rate and capacity usage ratio of middle one kind.Massive MIMO
Channel simulator needs 136 local oscillators to drive each transceiver channel, and 144 tunnel local oscillator of the technical program drives transceiver channel,
Solve Massive mimo channel simulator local oscillator how assignment problem, solve Massive mimo channel simulator local oscillator
Driving power size issue solves Massive mimo channel simulator local oscillator input phase consistency problem, believes local oscillator
Number and structure planning distribution rationally, have good structure design, and effectively control cost, make the technical program applicability
It is bigger, there is extensive prospect of the application.
Detailed description of the invention
Fig. 1 is showing for the circuit structure of the invention that local oscillator driving function is realized based on extensive MIMO technique
It is intended to.
Fig. 2 is the electricity of the circuit structure of the invention that local oscillator driving function is realized based on extensive MIMO technique
Road block diagram.
Fig. 3 is the of the circuit structure of the invention that local oscillator driving function is realized based on extensive MIMO technique
One point of eight power divider circuits figure of one drive circuit.
Fig. 4 is the of the circuit structure of the invention that local oscillator driving function is realized based on extensive MIMO technique
One point of 18 power divider integrated circuit figure of two driving circuits.
Fig. 5 is the of the circuit structure of the invention that local oscillator driving function is realized based on extensive MIMO technique
One point of nine power divider one of two driving circuits divides three not equal part circuit diagrams.
Fig. 6 is the of the circuit structure of the invention that local oscillator driving function is realized based on extensive MIMO technique
One point of nine power divider of two driving circuits not equal part detail impedance matching portion schematic diagram.
Specific embodiment
It is further to carry out combined with specific embodiments below in order to more clearly describe technology contents of the invention
Description.
This realizes the circuit structure of local oscillator driving function based on extensive MIMO technique, is mainly characterized by,
The system includes:
Local oscillator module, for generating high-power RF signal；
First driving circuit, the input terminal of first driving circuit are connected with the output end of the local oscillator module
It connects, for the signal constant amplitude of the local oscillator module to be mutually divided into together eight road signals；
Second driving circuit group, including 8 identical second driving circuits, the input of 8 second driving circuits
End is connected with the output end of eight tunnel output signals of first driving circuit respectively, for by first driving circuit
Signal constant amplitude is the same as phase branch.
In a preferred embodiment of the invention, the local oscillator module includes numerical-control attenuator, for output not
Same frequency signal power is adjusted.
Wherein, the range of the numerical-control attenuator is 0 to 15dB.
In a preferred embodiment of the invention, first driving circuit includes one point of eight power divider, and should
One point of eight power divider is connected with the local oscillator module.
In a preferred embodiment of the invention, second driving circuit includes:
First amplifier, the input terminal of first amplifier are connected with the output end of first driving circuit
It connects, for amplifying the input signal of the second driving circuit；
One point of nine wideband power distributor, the input terminal of one point of nine wideband power distributor are put with described first
The output end of big device is connected, for the signal for passing through the first amplifier to be divided into nine road signals；
Second amplifier group, including 9 the second amplifiers, the input terminal of 9 second amplifiers respectively with it is described
The output end of nine tunnel output signals of one point of nine wideband power distributor be connected, for will be by one point of nine broadband power point
The signal of orchestration amplifies；
One-to-two power divider group, including 9 one-to-two power dividers, 9 one-to-two power dividers
Input terminal be connected respectively with the output end of 9 second amplifiers, for the signal of the second amplifier group will to be passed through
It halves.
Wherein, the gain of first amplifier is 15dB, and the insertion of one point of nine wideband power distributor is damaged
Consumption is not more than 16dB, and the gain of the second amplifier group is 18dB, and the insertion of the one-to-two power divider group is damaged
Consumption is not more than 4dB.
In a preferred embodiment of the invention, one point of nine wideband power distributor includes that two-stage one is not divided three not
Equal power is connected with the output end of first amplifier.
In a preferred embodiment of the invention, one point of three unequal power distributor uses symmetric form, and
The microstrip line form of three road signals of one point of three unequal power distributor is essentially identical.
In a preferred embodiment of the invention, first driving circuit and the second driving circuit group are all made of second order
Quarter-wave microstrip line carries out impedance transformation.
Wherein, which is characterized in that the microstrip line carries out two-stage impedance transformation in the changeover portion of narrow road microstrip line.
In a preferred embodiment of the invention, which is characterized in that the output signal of the local oscillator module passes through radio frequency
Cable transmission to first driving circuit, the output signal of first driving circuit is transmitted to institute by radio-frequency cable
The the second driving circuit group stated.
In a preferred embodiment of the invention, which is characterized in that the local oscillator module is generated by high stable crystal oscillator
Local oscillation signal hertz not less than 7.5GHz and be not more than 13.5GHz, harmonic wave be better than -40dBc, power be not less than 14dBm.
In a preferred embodiment of the invention, which is characterized in that the function of the output signal of first driving circuit
Rate is not less than -1dBm.
In a preferred embodiment of the invention, which is characterized in that the insertion loss of first driving circuit is little
In 15dB.
In a preferred embodiment of the invention, which is characterized in that the output signal of the second driving circuit group
Power is not less than 15dBm.
In a specific embodiment of the invention, it is based on a kind of 5G Massive mimo channel simulator, this channel mould herein
Quasi- device is 128 × 8 matrix channel simulators, there is 136 transceiver channels, that is, needs 136 local oscillators to drive each channel how
136 channels provide the solution main points that local oscillation signal becomes this paper in giving.
In technical solution of the present invention, dBm is decibel milliwatt, and dB is decibel, and GHz is girz.
Massive mimo channel simulator needs 136 local oscillators to drive each transceiver channel, sees Fig. 1.In order to reasonable
Transceiver channel, is divided into 18 one group by the planning for distributing local oscillation signal and structure in structure, and totally 8 groups, so needing one one
Divide eight local oscillator driving circuits, 7 one point 18 local oscillator driving circuits and 1 one point of ten local oscillator driving, it is contemplated that cost and structure
Design etc., drives transceiver channel using one one point eight local oscillator driving circuits and 8 one point 18 local oscillator driving circuits, altogether
144 tunnel local oscillators drive transceiver channel.
The present invention provides the local oscillator driving circuit of Massive MIMO a kind of, including local oscillator module, driving circuit 1 is driven
Dynamic circuit 2, circuit block diagram of the present invention are shown in Fig. 2.
Local oscillator module generates pure broadband and high-power RF signal, and local oscillator module has numerical-control attenuator, can be to most
The different frequency signals power exported afterwards is adjusted.
The radiofrequency signal that local oscillator module generates inputs to driving circuit 1, and driving circuit 1 is that eight power distributions are divided in broadband one
The signal constant amplitude that local oscillator module inputs mutually is divided into eight road signals together, sees Fig. 3 by device, is the whole electricity of one point of eight power divider
Road figure and Local map.
Eight tunnel output signals of driving circuit 1 input 8 identical driving circuits 2 again respectively, and driving circuit 2 is one point ten
Eight wideband power distributors, and inside guarantees local oscillation power containing amplifier.Driving circuit 2 is by amplifier, one point of nine broadband
Power divider and one-to-two power divider composition, Fig. 4 are one point of 18 power divider integrated circuit figure, there is driving circuit
The local oscillation signal of 1 input first passes through level-one amplification and carries out one point of nine power distribution again and finally lead to then using first stage amplifier
One-to-two power etc. point is crossed to export signal to the transceiver module in each channel.
In present invention driver circuit, signal constant amplitude is mutually divided into together 144 through overdrive circuit 1 and 2 by the signal of local oscillator output
Road oscillating driving signal, amplifier ensure that local oscillation power size, and the design of one point of nine power divider in driving circuit 2 is protected
The consistency of the signal phase of signal is demonstrate,proved.
In Massive mimo channel simulator, 136 tunnel local oscillators is needed to drive, is used in the design of local oscillator driving circuit
The driving output of 144 tunnel local oscillators, the local oscillator of transceiver channel drive needs >=+15dBm, then the local oscillator driving circuit designed will guarantee often
All >=+15dBm in frequency range all the way.
As shown in Fig. 2, local oscillator module by high stable crystal oscillator generate 7.5GHz~13.5GHz local oscillation signal, harmonic wave better than-
40dBc, power >=+14dBm, power can be adjusted by numerical-control attenuator therein, and attenuator range is 0~15dB.Local oscillator
The broadband signal of module output is connected to the input port of driving circuit 1 by radio-frequency cable, passes through one point of eight function of driving circuit
Signal constant amplitude is mutually divided into together eight road signals, power >=-1dBm of output by rate distributor.Driving circuit 1 export signal again by
Radio-frequency cable is input in driving circuit 2, and in input circuit 2, signal first passes through first stage amplifier, then passes through one point of nine power
Distributor is finally exported by one-to-two power divider, final output signal >=+15dBm using first stage amplifier.
As shown in figure 3, being one point of eight power divider of driving circuit 1, having a size of 32.8mm × 328.6mm, this power
Distributor uses Rogers4350B substrate, carries out impedance transformation using second order quarter-wave microstrip line, thus needed for realizing
7.5GHz~13.5GHz bandwidth.It is designed according to the structure of Massive mimo channel simulator, power divider output end
Mouth spacing is 44.5mm.Insertion Loss≤15dB of driving circuit 1, as signal power >=+14dBm of local oscillator module input, driving
Signal power >=-1dBm that circuit 1 exports.
As shown in figure 4, being the integrated circuit figure of driving circuit 2, having a size of 66.8mm × 382.5mm, wherein including amplification
Device, one point of nine power divider and one-to-two power divider.Power divider substrate equally uses Rogers4350B substrate,
And impedance transformation is carried out using second order quarter-wave microstrip line, guarantee signal bandwidth.According to Massive mimo channel mould
The transceiver channel spacing of quasi- device, one point of nine power divider input port spacing are 43mm, one-to-two power divider output end
Mouth spacing is 17.5mm.
Due to 2 output port of driving circuit be 18 tunnels output, not for 2 Nth power (N is integer), so that power
It must include odd number power distribution in the design of distributor, one point of nine power divider just be devised in this way, wherein containing two
One point of three unequal power distributor of grade, as shown in figure 5, being the part of one point of three unequal power distributor.It is supplied to transmitting-receiving
The local oscillation signal in channel needs the same phase of constant amplitude, so symmetric mode is used in one point of three unequal power distributor, i.e., three
The microstrip line form on road is essentially identical, this ensure that on this three paths signal being consistent property of phase.
In one point of nine power divider, due to wherein containing one point of three unequal power distributor, in power distribution
When micro-strip line width can be inconsistent, lead to have all the way that microstrip line can be very narrow, as shown in fig. 6, will cause the mismatch of impedance, institute in this way
To have carried out two-stage impedance transformation in narrow road the microstrip line to the end transition of microstrip line, microstrip line is broadened by narrow, so that impedance
There is good matching.
In driving circuit 2, the gain of first order amplifier is 18dB, one point of nine power divider Insertion Loss≤16dB, the
Two-stage amplifier gain is 18dB, one-to-two power divider Insertion Loss≤4dB, as the power >=-1dBm inputted by driving circuit 1
When, power >=+15dBm that driving circuit 2 finally exports ensure that the local oscillator driving of transceiver module.Meanwhile 7.5GHz~
The gain and Insertion Loss meeting difference of 13.5GHz signal output in varied situations, can pass through the numerical control for controlling local oscillator module at this time
Attenuator adjusts last output power, so that signal power is within claimed range.
Massive mimo channel simulator needs 136 local oscillators to drive each transceiver channel, 144 tunnel of the technical program
Local oscillator drives transceiver channel, solve Massive mimo channel simulator local oscillator how assignment problem, solve Massive
Mimo channel simulator local oscillator driving power size issue solves Massive mimo channel simulator local oscillator input phase one
Cause property problem makes the planning of local oscillation signal and structure distribution rationally, has the design of good structure, and effectively control cost,
Keep the technical program applicability bigger, there is extensive prospect of the application.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that can still make
Various modifications and alterations are without departing from the spirit and scope of the invention.Therefore, the description and the appended drawings should be considered as illustrative
And not restrictive.
Claims (15)
1. a kind of circuit structure for realizing local oscillator driving function based on extensive MIMO technique, which is characterized in that institute
The circuit structure stated includes:
Local oscillator module, for generating high-power RF signal；
First driving circuit, the input terminal of first driving circuit are connected with the output end of the local oscillator module, use
In by the signal constant amplitude of the local oscillator module with being mutually divided into eight road signals；
Second driving circuit group, including 8 identical second driving circuits, the input terminal point of 8 second driving circuits
It is not connected with the output end of eight tunnel output signals of first driving circuit, for by the signal of first driving circuit
Constant amplitude is the same as phase branch.
2. the circuit knot according to claim 1 for realizing local oscillator driving function based on extensive MIMO technique
Structure, which is characterized in that the local oscillator module includes numerical-control attenuator, for adjusting to the different frequency signals power of output
Section.
3. the circuit knot according to claim 2 for realizing local oscillator driving function based on extensive MIMO technique
Structure, which is characterized in that the range of the numerical-control attenuator is 0 to 15dB.
4. the circuit knot according to claim 1 for realizing local oscillator driving function based on extensive MIMO technique
Structure, which is characterized in that first driving circuit includes one point of eight power divider, and one point of eight power divider and institute
The local oscillator module stated is connected.
5. the circuit knot according to claim 1 for realizing local oscillator driving function based on extensive MIMO technique
Structure, which is characterized in that second driving circuit includes:
First amplifier, the input terminal of first amplifier are connected with the output end of first driving circuit, use
Amplify in by the input signal of the second driving circuit；
One point of nine wideband power distributor, the input terminal of one point of nine wideband power distributor and first amplifier
Output end be connected, for the signal for passing through the first amplifier to be divided into nine road signals；
Second amplifier group, including 9 the second amplifiers, the input terminal of 9 second amplifiers is respectively with described one
The output end of nine tunnel output signals of nine wideband power distributors is divided to be connected, for one point of nine wideband power distributor will to be passed through
Signal amplification；
One-to-two power divider group, including 9 one-to-two power dividers, 9 one-to-two power dividers it is defeated
Enter end to be connected with the output end of 9 second amplifiers respectively, the signal for that will pass through the second amplifier group is second-class
Point.
6. the circuit knot according to claim 5 for realizing local oscillator driving function based on extensive MIMO technique
Structure, which is characterized in that the gain of first amplifier is 15 decibels, the insertion of one point of nine wideband power distributor
Loss is not more than 16dB, and the gain of the second amplifier group is 18dB, the insertion of the one-to-two power divider group
Loss is not more than 4dB.
7. the circuit knot according to claim 5 for realizing local oscillator driving function based on extensive MIMO technique
Structure, which is characterized in that one point of nine wideband power distributor includes that two-stage one divides three unequal power distributors, with institute
The output end for the first amplifier stated is connected.
8. the circuit knot according to claim 7 for realizing local oscillator driving function based on extensive MIMO technique
Structure, which is characterized in that one point of three unequal power distributor uses symmetric form, and this point three not equal part power point
The microstrip line form of three road signals of orchestration is identical.
9. the circuit knot according to claim 1 for realizing local oscillator driving function based on extensive MIMO technique
Structure, which is characterized in that first driving circuit and the second driving circuit group is all made of second order quarter-wave microstrip line
Carry out impedance transformation.
10. according to any one of claim 1 to 9 realize that local oscillator drives function based on extensive MIMO technique
The circuit structure of energy, which is characterized in that the microstrip line carries out two-stage impedance transformation in the changeover portion of narrow road microstrip line.
11. according to any one of claim 1 to 9 realize that local oscillator drives function based on extensive MIMO technique
The circuit structure of energy, which is characterized in that the output signal of the local oscillator module is transmitted to described first by radio-frequency cable
The output signal of driving circuit, first driving circuit is transmitted to the second driving circuit group by radio-frequency cable.
12. according to any one of claim 1 to 9 realize that local oscillator drives function based on extensive MIMO technique
The circuit structure of energy, which is characterized in that the local oscillator module is not small by the hertz for the local oscillation signal that high stable crystal oscillator generates
In 7.5GHz and it is not more than 13.5GHz, harmonic wave is better than -40dBc, and power is not less than 14dBm.
13. according to any one of claim 1 to 9 realize that local oscillator drives function based on extensive MIMO technique
The circuit structure of energy, which is characterized in that the power of the output signal of first driving circuit is not less than -1dBm.
14. according to any one of claim 1 to 9 realize that local oscillator drives function based on extensive MIMO technique
The circuit structure of energy, which is characterized in that the insertion loss of first driving circuit is not more than 15dB.
15. according to any one of claim 1 to 9 realize that local oscillator drives function based on extensive MIMO technique
The circuit structure of energy, which is characterized in that the power of the output signal of the second driving circuit group is not less than 15dBm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110855378A (en) * | 2019-12-19 | 2020-02-28 | 上海创远仪器技术股份有限公司 | Reference circuit structure for massive MIMO channel simulator |
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