CN104618042B - Realize the synchronous system and method with time delay adjustment of Multi-channel signal analysis - Google Patents
Realize the synchronous system and method with time delay adjustment of Multi-channel signal analysis Download PDFInfo
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Abstract
The present invention relates to a kind of realize the synchronous system and method with time delay adjustment of Multi-channel signal analysis, including the several and one-to-one radio-frequency channel unit of each passage, each radio-frequency channel unit is the radio-frequency input signals of corresponding passage to be converted into the intermediate-freuqncy signal of fixed frequency and is digitally converted；The several and one-to-one baseband processing unit of each passage, each baseband processing unit carry out digital demodulation signal, the compensation of group delay and interchannel time delay error correction to the output signal to corresponding radio-frequency channel unit；Several data storage cells corresponding with each passage；Precision synchronous unit, carries out delays time to control to the signal to baseband processing unit.Using the system and method for realizing Multi-channel signal analysis synchronization and time delay adjustment of this kind of structure, the synchronous requirement of multiple channel test is realized on a single device, the confidence level of Multi-channel signal analysis is improve, hardware complexity is reduced, with wider range of application.
Description
Technical field
The present invention relates to communication technical field, more particularly to signal simultaneous techniques field, specifically refer to a kind of realization and lead to more
The synchronous system and method with time delay adjustment of road signal analysis.
Background technology
With the development of digital cellular telecommunications system technology, in order under limited frequency spectrum resource, improve system data rates and
Capacity, MIMO (Multiple-Input Multiple-Output, the MIMO technique) technology of multiple antennas are a large amount of
Using, in LTE-Advanced standards, descending highest supports 8 × 8 multiple antennas configuration.In view of the complexity of mimo system is just
Increasingly improving, thus the method for testing and its equipment of correlation also will more challenge, from difficulty of test, testing cost and survey
In examination efficiency, higher requirement is proposed to new test equipment.
First, the system of multiple antennas considerably increases the hardware cost of test system due to the increase of number of channels.Such as
The mimo system of 8 passages, in principle with regard to must 8 independent signalling channels carry out while measure, not repeating here.MIMO is more
The test of channel signal belongs to the testing requirement of newly-developed, and some related to this method of testings and equipment are all based on single-pass
Road equipment carries out system buildup and forms, system complex, and calibration is bothered very much, or even calibration process is far longer than test process, because
This testing cost is high, inefficiency.
Secondly, in the various modes of mimo system, data flow is transmitted by different channels, except cross-couplings are disturbed
Outside, the Phase synchronization between each reception is particularly important, and larger delay between passage even can produce fatal to broadband signal
Affect, in the standard of TD-LTE Advanced, time delay error between most stringent of regulation MIMO passage is needed less than 24ns.
And for test system, this time delay error needs the less requirement that could meet measurement.Therefore, in MIMO measurement process
In, needs carry out the Synchronization Control of precision to each passage.Fig. 1 is the Signal Analysis System schematic diagram of a 8 passage MIMO, it by
8 independent signal analyzer compositions, every instrument one Measurement channel of correspondence are same by reference to synchronous and triggering between equipment
Step realizes Synchronization Control.Here, with reference to the synchronous local oscillator and clock lock for making 8 equipment to same with reference to upper, triggering is synchronous
The trigger for then being sent by certain equipment makes 8 equipment while being processed and being analyzed.
But, above-mentioned this Synchronization Control, to MIMO test for remain far from being enough, although local oscillator, clock with
And triggering completes synchronization, but due to the passage group delay of each equipment it is in irregular discrete distribution and widely different, to this
For individual test system, needs are additionally compensated to the passage group delay of each equipment, carry out time delay error correction, Ran Houcai
Can guarantee that the accuracy of MIMO signal analysis.And this delay character belongs to the physical parameter of hardware, can over time, environment,
Temperature etc. changes.Therefore, this test system is extremely inefficient.
The content of the invention
The purpose of the present invention is the shortcoming for overcoming above-mentioned prior art, there is provided one kind can be realized on a single device
Realize multiple channel test the synchronous confidence level for requiring, improve Multi-channel signal analysis, reduce hardware complexity, with more
The system and method for realizing Multi-channel signal analysis synchronization and time delay adjustment of broad field of application.
To achieve these goals, the of the invention system and method for realizing Multi-channel signal analysis synchronization and time delay adjustment
With following composition：
This realizes the synchronous system with time delay adjustment of Multi-channel signal analysis, and which is mainly characterized by, and described system includes：
It is several with the one-to-one radio-frequency channel unit of each passage, the radio-frequency channel unit described in each to by it is right
The radio-frequency input signals of the passage answered is converted into the intermediate-freuqncy signal of fixed frequency and is digitally converted；
It is several with the one-to-one baseband processing unit of each passage, the baseband processing unit described in each to it is right
The output signal of the radio-frequency channel unit answered carries out digital demodulation signal and interchannel time delay error correction；
The several and one-to-one data storage cell of each passage, the data storage cell described in each is to store
The data of corresponding baseband processing unit output；
Precision synchronous unit, carries out delays time to control to the signal to described baseband processing unit.
It is preferred that the baseband processing unit described in each includes I roads delays time to control single channel, Q roads delays time to control single channel and letter
The output end of number demodulator, described I roads delays time to control single channel and Q roads delays time to control single channel respectively with described demodulator of PM signal PM
Input be connected.
More preferably, described baseband processing unit also includes I roads group delay compensation circuit and Q roads group delay compensation circuit,
The output end of described I roads group delay compensation circuit is connected with the input of described I roads delay control circuit, described Q
The output end of road group delay compensation circuit is connected with the input of described Q roads delay control circuit.
It is preferred that described precision synchronous unit is used for the frequency that frequency spectrum shift is provided for the radio-frequency channel unit described in each
Rate reference signal and data storage synchronous control signal is sent to the data storage cell described in each.
More preferably, described precision synchronous unit includes：
Precision interval clock generator, to the clock signal of the default precision of generation system；
Four phase clock generators, to produce four clock signals, described four clock signals each other frequency it is identical and
There are 90 ° of phase differences successively；
Clock distribution manager, to select different clocks to carry out timing_delay estimation；
Programmable delay circuit, carries out delays time to control to the signal to described baseband signal processing unit.
Further, described programmable delay circuit includes 24bits high-speed counters.
It is preferred that described system also includes multi-channel switch matrix and external signal generator, described multichannel is opened
Close the output signal of the described external signal generator of input input of matrix, each passage of described multi-channel switch matrix
Output signal is input into the radio-frequency channel unit corresponding to each passage, described precision synchronous unit output synchro switch control respectively
Signal processed is to described multi-channel switch matrix.
The invention further relates to a kind of realize the synchronous method with time delay adjustment of Multi-channel signal analysis based on described system,
Which is mainly characterized by, and described method is comprised the following steps：
(1) by controlling the input signal of the radio frequency input block described in each controlling the radio-frequency channel point described in each
When individually gate；
(2) by described baseband processing unit the demodulation of the signal of each independent radio frequency path is obtained each passage when
Between time delay error；
(3) the time delay adjustment value of each passage is calculated by the clock speed and number of counter bits of programmable delay circuit；
(4) the programmable delay circuit described in carries out delay correction to each passage according to the time delay adjustment value of each passage.
It is preferred that described system also includes multi-channel switch matrix and external signal generator, described external signal
The output end of generator is connected with the input of described multi-channel switch matrix, and described each of multi-channel switch matrix is led to
Road output signal is input into the radio-frequency channel unit corresponding to each passage respectively, described defeated by controlling radio frequency described in each
Enter the input signal of unit and individually gate controlling the radio-frequency channel timesharing described in each, specially：
Timesharing is carried out to the radio-frequency channel described in each by the described multi-channel switch matrix of control individually to gate.
The system and method for realizing Multi-channel signal analysis synchronization and time delay adjustment in the invention is employed, with as follows
Beneficial effect：
The invention provides a kind of associated synchronisation technology and method for setting up multi channel signals test, to system design and mould
Block proposes new design requirement, so that can be realized as the synchronous requirement of multiple channel test on a single device；The system
Solve the difficult problem for how carrying out multichannel time delay adjustment simultaneously, this bearing calibration is simple, it is easy to accomplish, and correction time
It is all very low with hardware cost；It is crucial that, by this calibration steps, rate Time Delay of Systems error is substantially reduced, is improve many
The confidence level of channel signal analysis, and the system that multiple devices are set up, due to structural design defect, some error terms are cannot
Eliminate；The system connection of the present invention and test are very simple, greatly reduce hardware complexity, increase rate testing efficiency, drop
Low testing cost.
Description of the drawings
Fig. 1 is the Signal Analysis System schematic diagram of 8 passage MIMO of the prior art.
Fig. 2 is the structural representation for realizing the synchronous system with time delay adjustment of Multi-channel signal analysis of the present invention.
Fig. 3 is the internal structure schematic diagram of the baseband signal processing unit of the present invention.
Fig. 4 is the internal structure schematic diagram of the precision synchronous unit of the present invention.
Fig. 5 is that the present invention realizes that the synchronous system with time delay adjustment of Multi-channel signal analysis is applied to specific embodiment
Structural representation.
Fig. 6 is the schematic diagram of the non-ideal channel time delay and physical channel time delay of the present invention.
Specific embodiment
In order to more clearly describe the technology contents of the present invention, carry out with reference to specific embodiment further
Description.
The present invention is directed to MIMO multi channel signals testing features, proposes new design side from system composition, channel design etc.
Method, by software using the method for automatic correction channel delay inequality, greatly simplifies the synchronous method of this test system, improves
System testing efficiency.
The present invention's realizes that the synchronous system with time delay adjustment of Multi-channel signal analysis includes：
It is several with the one-to-one radio-frequency channel unit of each passage, the radio-frequency channel unit described in each to by it is right
The radio-frequency input signals of the passage answered is converted into the intermediate-freuqncy signal of fixed frequency and is digitally converted；
It is several with the one-to-one baseband processing unit of each passage, the baseband processing unit described in each to it is right
The output signal of the radio-frequency channel unit answered carries out digital demodulation signal and interchannel time delay error correction；
The several and one-to-one data storage cell of each passage, the data storage cell described in each is to store
The data of corresponding baseband processing unit output；
Precision synchronous unit, carries out delays time to control to the signal to described baseband processing unit.
In actual applications, radio-frequency channel unit, baseband processing unit and data storage cell according to the quantity of passage and
Arrange, respectively each passage is processed, and precision synchronous unit adopts integrated setting, while the letter of the multiple passages of control
Number time delay adjustment.
In a kind of preferably embodiment, the baseband processing unit described in each includes I roads delays time to control single channel, Q roads
The output end of delays time to control single channel and demodulator of PM signal PM, described I roads delays time to control single channel and Q roads delays time to control single channel respectively with
The input of described demodulator of PM signal PM is connected, and the I roads signal to each passage and Q roads signal carry out delay correction respectively.
In a kind of more preferably embodiment, described baseband processing unit also includes I roads group delay compensation circuit and Q roads
Group delay compensation circuit, the output end of described I roads group delay compensation circuit and the input of described I roads delay control circuit
It is connected, the output end of described Q roads group delay compensation circuit is connected with the input of described Q roads delay control circuit.
In a kind of preferably embodiment, described precision synchronous unit is used for as the radio-frequency channel unit described in each
The frequency reference signal of frequency spectrum shift is provided and data storage Synchronization Control letter is sent to the data storage cell described in each
Number.
In a kind of more preferably embodiment, described precision synchronous unit includes：
Precision interval clock generator, to the clock signal of the default precision of generation system；
Four phase clock generators, to produce four clock signals, described four clock signals each other frequency it is identical and
There are 90 ° of phase differences successively；
Clock distribution manager, to select different clocks to carry out timing_delay estimation；
Programmable delay circuit, carries out delays time to control to the signal to described baseband signal processing unit.
In a kind of more preferably embodiment, described programmable delay circuit includes 24bits high-speed counters.
In a kind of preferably embodiment, described system also includes that multi-channel switch matrix and external signal occur
Device, the input of described multi-channel switch matrix are input into the output signal of described external signal generator, and described leads to more
Each multi-channel output signal of road switch matrix is input into the radio-frequency channel unit corresponding to each passage, described precision synchronous respectively
Unit exports synchro switch control signal to described multi-channel switch matrix.
The present invention's realizes that the synchronous method with time delay adjustment of Multi-channel signal analysis is comprised the following steps：
(1) by controlling the input signal of the radio frequency input block described in each controlling the radio-frequency channel point described in each
When individually gate；
(2) by described baseband processing unit the demodulation of the signal of each independent radio frequency path is obtained each passage when
Between time delay error；
(3) the time delay adjustment value of each passage is calculated by the clock speed and number of counter bits of programmable delay circuit；
(4) the programmable delay circuit described in carries out delay correction to each passage according to the time delay adjustment value of each passage.
In a kind of preferably embodiment, the described input signal by controlling the radio frequency input block described in each
Individually gate to control the radio-frequency channel timesharing described in each, specially：
Timesharing is carried out to the radio-frequency channel described in each by the described multi-channel switch matrix of control individually to gate.
Below with a specific embodiment being further described the present invention：
The present invention as shown in Fig. 2 be made up of 4 parts, be respectively radio-frequency channel unit, baseband signal processing unit and
Data storage cell RAM and a precision synchronous unit composition.Radio-frequency channel unit and baseband processing unit are to realize single channel
Signal analysis essential elements, this structure of the present invention, by precision synchronous unit, can provide for multichannel signal measurement
Local oscillator is synchronous, trigger synchronization and clock synchronization, and can pass through to calibrate the delay inequality for eliminating unlike signal passage, to meet
The requirement of multichannel MIMO signal measurement.
Radio-frequency input signals is transformed to the intermediate-freuqncy signal of fixed frequency and completes digitlization conversion, phase by radio-frequency channel unit
Between need to realize frequency spectrum shift using converter technique, and realize that the local oscillation signal of frequency spectrum shift needs synchronization, precision synchronous unit
High-precision frequency reference signal REF [n] is provided for each radio-frequency channel unit, locks onto the local oscillation signal of each passage
In this reference signal.So, frequency difference is not had between the signal of each passage, completes signal frequency synchronization.
Base band signal process is mainly Digital Signal Processing, while completing signal demodulation, in addition it is also necessary to complete group delay
Compensation and interchannel time delay error correction, as shown in Figure 3.In the present invention, it is different from other base band signal process, every
A delays time to control single channel is increased on individual I/Q passages, by delay control signal Delay [n] realizing prolonging for every road signal
Shi Jiaozheng, so as to realize the true synchronization between each passage.Each baseband signal processing unit can export a trigger
Trig [n], due to the change of passage configuration relation, the path of main control channel is random, therefore each signal processing unit
It is likely to export trigger, is automatically selected by precision synchronous unit, realizes the synchronous triggering of different passages.
RAM is mainly used in the original measurement I/Q data for storing different passages, provides data source for signal analysis afterwards.By
The synchronous control signal Syn [n] that precision synchronous unit sends, to ensure the synchronization of the data source storage of each passage.
Precision synchronous unit is the emphasis of the present invention, as shown in figure 4, it is mainly by precision interval clock generator, at a high speed four phases
Clock generator, clock distribution manager and programmable delay circuit are constituted.Precision interval clock generator produces high-precision clock
Signal, four phase clock generators are produced with frequency but phase difference is 90 degree of clock signal, are selected by clock distribution manager, can
To select different clocks to carry out timing_delay estimation.The synchronised clock of such as 400MHz, monocycle are 2.5ns, by four phase clocks
Generator can produce the clock resolution of 0.6ns, substantially increase synchronization accuracy.Programmable delay circuit is counted by 24bits at a high speed
The compositions such as number device, can enter line delay to signal.
By above method, artificial delays time to control can be carried out to every road signal, by measuring the intrinsic of different passages
Delay inequality, on the basis of maximum delay passage, by the time delay for adjusting different passages, so as to realize multichannel Delay Synchronization.
Fig. 5 gives the measuring method of this synchronous error.In addition to said system, in addition it is also necessary to an external signal generator
With multi-path choice RF switch (what is be given in figure is 8 channel radio frequencies switch).Its bearing calibration is as follows：
(1) radio-frequency signal source exports the signal of channel receives frequency, and point frequency continuous wave output is exported to 8 channel switch squares
Battle array；
(2) input for exporting corresponding each radio-frequency channel respectively of switch matrix is attached, and channel switch signal is by essence
Close lock unit is provided, and timesharing gates different radio frequency paths；
(3) each passage is demodulated to signal respectively, demodulates the signal of each passage, as shown below：
(4) as timesharing gating signal is known, by the RF pulse signal for demodulating different paths, can obtain every
Delay error delta tn of individual passage.
(5) by the clock size of delay unit and series its digit, the time delay adjustment value of each passage is calculated, and is controlled
Program control time delay circuit.
The system and method for realizing Multi-channel signal analysis synchronization and time delay adjustment in the invention is employed, with as follows
Beneficial effect：
The invention provides a kind of associated synchronisation technology and method for setting up multi channel signals test, to system design and mould
Block proposes new design requirement, so that can be realized as the synchronous requirement of multiple channel test on a single device；The system
Solve the difficult problem for how carrying out multichannel time delay adjustment simultaneously, this bearing calibration is simple, it is easy to accomplish, and correction time
It is all very low with hardware cost；It is crucial that, by this calibration steps, rate Time Delay of Systems error is substantially reduced, is improve many
The confidence level of channel signal analysis, and the system that multiple devices are set up, due to structural design defect, some error terms are cannot
Eliminate；The system connection of the present invention and test are very simple, greatly reduce hardware complexity, increase rate testing efficiency, drop
Low testing cost.
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 present invention.Therefore, specification and drawings are considered as illustrative
And it is nonrestrictive.
Claims (5)
1. it is a kind of to realize the synchronous system with time delay adjustment of Multi-channel signal analysis, it is characterised in that described system includes：
It is several with the one-to-one radio-frequency channel unit of each passage, the radio-frequency channel unit described in each is to will be corresponding
The radio-frequency input signals of passage is converted into the intermediate-freuqncy signal of fixed frequency and is digitally converted；
The several and one-to-one baseband processing unit of each passage, the baseband processing unit described in each is to corresponding
The output signal of radio-frequency channel unit carries out digital demodulation signal and interchannel time delay error correction；At base band described in each
Reason unit includes I roads delays time to control single channel, Q roads delays time to control single channel and demodulator of PM signal PM, described I roads delays time to control single channel and
The output end of Q roads delays time to control single channel is connected with the input of described demodulator of PM signal PM respectively；Described Base-Band Processing list
Unit also includes I roads group delay compensation circuit and Q roads group delay compensation circuit, the output end of described I roads group delay compensation circuit
Be connected with the input of described I roads delay control circuit, the output end of described Q roads group delay compensation circuit with it is described
The input of Q roads delay control circuit is connected；It is several with the one-to-one data storage cell of each passage, described in each
Data storage cell is to store the data that corresponding baseband processing unit is exported；
Precision synchronous unit, carries out delays time to control, described precision synchronous list to the signal to described baseband processing unit
Unit is used to provide the frequency reference signal of frequency spectrum shift and to the data described in each for the radio-frequency channel unit described in each
Memory cell sends data storage synchronous control signal, and described precision synchronous unit includes：
Precision interval clock generator, to the clock signal of the default precision of generation system；
Four phase clock generators, to produce four clock signals, frequency is identical and successively each other for described four clock signals
With 90 ° of phase differences；
Clock distribution manager, to select different clocks to carry out timing_delay estimation；
Programmable delay circuit, carries out delays time to control to the signal to described baseband signal processing unit.
2. it is according to claim 1 to realize the synchronous system with time delay adjustment of Multi-channel signal analysis, it is characterised in that institute
The programmable delay circuit stated includes 24bits high-speed counters.
3. it is according to claim 1 to realize the synchronous system with time delay adjustment of Multi-channel signal analysis, it is characterised in that institute
The system stated also includes multi-channel switch matrix and external signal generator, and the input of described multi-channel switch matrix is input into
The output signal of described external signal generator, each multi-channel output signal of described multi-channel switch matrix are input into respectively respectively
Radio-frequency channel unit corresponding to individual passage, described precision synchronous unit output synchro switch control signal lead to described more
Road switch matrix.
4. the synchronous side with time delay adjustment of Multi-channel signal analysis is realized based on the system any one of claims 1 to 3
Method, it is characterised in that described method is comprised the following steps：
(1) by controlling the input signal of the radio frequency input block described in each controlling the radio-frequency channel timesharing list described in each
Solely gate；
(2) when the signal demodulation by described baseband processing unit to each independent radio frequency path obtains the time of each passage
Delay is poor；
(3) the time delay adjustment value of each passage is calculated by the clock speed and number of counter bits of programmable delay circuit；
(4) the programmable delay circuit described in carries out delay correction to each passage according to the time delay adjustment value of each passage.
5. it is according to claim 4 to realize the synchronous method with time delay adjustment of Multi-channel signal analysis, it is characterised in that institute
The system stated also includes multi-channel switch matrix and external signal generator, the output end of described external signal generator and institute
The input of the multi-channel switch matrix stated is connected, and each multi-channel output signal of described multi-channel switch matrix is input into respectively
Radio-frequency channel unit corresponding to each passage, it is described by control the input signal of the radio frequency input block described in each come
Control the radio-frequency channel timesharing described in each individually to gate, specially：
Timesharing is carried out to the radio-frequency channel described in each by the described multi-channel switch matrix of control individually to gate.
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| CN109188987A (en) * | 2018-10-26 | 2019-01-11 | 威海威高电子工程有限公司 | Multi channel signals high-precise synchronization control method and device based on high speed D/A |
| CN111342911B (en) * | 2018-12-18 | 2021-09-14 | 华为技术有限公司 | Method and apparatus for calibrating radio frequency link |
| CN110412624A (en) * | 2019-08-22 | 2019-11-05 | 华东师范大学 | The live signal method of reseptance of Chinese Beidou three and the public frequency point of GPS |
| CN112994817B (en) * | 2019-12-02 | 2022-07-26 | 普源精电科技股份有限公司 | System, method and calibration method for realizing synchronization of multiple signal sources based on synchronizer |
| CN113872745B (en) * | 2021-08-20 | 2024-02-13 | 中国船舶重工集团公司第七二三研究所 | Multichannel signal synchronization system and method |
| CN115128562B (en) * | 2022-08-29 | 2022-11-29 | 长沙隼眼软件科技有限公司 | Channel calibration method, device and storage medium |
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