CN103762979B - Broadband frequency source for LTE channel simulator - Google Patents
Broadband frequency source for LTE channel simulator Download PDFInfo
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- CN103762979B CN103762979B CN201410003575.9A CN201410003575A CN103762979B CN 103762979 B CN103762979 B CN 103762979B CN 201410003575 A CN201410003575 A CN 201410003575A CN 103762979 B CN103762979 B CN 103762979B
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Abstract
The invention discloses a broadband frequency source for an LTE channel simulator and belongs to the technical field of microwave/millimeter wave devices. The frequency source can output broadband radio frequency local oscillator signals and medium frequency phase adjustable local oscillator signals. The broadband frequency source comprises a reference clock module, a broadband frequency synthesizer module and a medium frequency synthesizer module. The reference clock module provides needed reference clock signals for a broadband frequency synthesizer and provides phase-adjustable and frequency-adjustable reference clock signals for a medium frequency synthesizer. The broadband frequency synthesizer module is a phase-lock frequency synthesizer formed by three broadband voltage-controlled oscillators. The reference clock of the medium frequency phase-adjustable synthesizer module is provided by a direct digital frequency synthesizer (DDS), and frequency and phase adjusting can be achieved. The broadband frequency source has the advantages of being wide in bandwidth, low in power consumption, small in size, high in relative noise index and suitable for the LTE channel simulator and a corresponding broadband radio frequency transceiver.
Description
Technical field
The present invention relates to the radio-frequency technique neck in microwave/millimeter wave device arts, more particularly, to LTE mobile communication
Domain, particularly a kind of broadband frequency source being applied to LTE channel simulator realizes device.
Background technology
National science and technology key special subjects " new generation broadband wireless mobile communication net " are the Chinese government to promote China
Communications industry overall development, in global status, cultivating China's mobile communications industry can for lifting China wireless mobile communications industry
Sustainable development capacity, pulls the important measures of China's national industry innovation and development.TD-LTE and its evolution technology TD-LTE-
Advanced, as the follow-up evolution technology of TD-SCDMA with the independent intellectual property of China, will more embody China and exist
The competitiveness in international communication field.
Wireless channel is extremely complex and changeable signal physical channel, wireless channel exist multipath fading, flat decline,
Noise etc. affects the unfavorable factor of communication performance, and the problem of these to be all communication systems have to emphasis considerations, channel
Simulation be to ensure that under same communication protocol and system system, the system equipment that the terminal of different manufacturers exploitation is provided with many producers it
Between smooth communication requisite testing process.By development support LTE radio channel simulator, save mobile communication equipment
Development cost, increased motility during research and development, shortens the lead time simultaneously, reduces the overall development mistake of base station and terminal unit
Journey and interconnecting the testing time, reduces the time of field testing, to improve and ensure different system, manufacturer terminal interconnection mutual
It is connected with very positive effect.
The performance in LTE channel simulator medium frequency source is key component in whole equipment, and this frequency source is to radio-frequency transmitter
There is provided RF local oscillator signal and intermediate frequency local oscillator signal with transmitter it is desirable to radio frequency outputting bandwidth, low phase noise and intermediate frequency are defeated
Go out the functions such as phase-adjustable, also need the feature possessing low complex degree, low-power consumption simultaneously.
Content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides one kind to be applied to LTE channel simulation
The broadband frequency source of device, this frequency source can export wide band radio-frequency local oscillation signal and intermediate frequency phase-adjustable local oscillation signal, to reduce electricity
The complexity on road, reduces circuit stray, realizes the purpose of broadband, Low phase noise.
For achieving the above object, the present invention adopts the following technical scheme that：
A kind of broadband frequency source being applied to LTE channel simulator, this frequency source includes reference clock module, broadband frequency
Rate synthesizer and IF-FRE synthesizer；Reference clock module, for providing reference clock signal to broadband frequency synthesizer,
It is additionally operable to provide the reference clock signal of phase-adjustable, frequency-adjustable to IF-FRE synthesizer；Broadband frequency synthesizer, uses
RF local oscillator signal needed for LTE channel simulator is generated according to the reference clock signal that reference clock module provides；In again and again
Rate synthesizer, intermediate frequency local oscillator needed for for LTE channel simulator is generated according to the reference clock signal that reference clock module provides
Signal.
Further, reference clock module includes temperature compensating crystal oscillator, and described temperature compensating crystal oscillator is to phase discriminator, a passive ring
The phaselocked loop of wave filter, voltage-controlled oscillator and frequency divider composition provides clock reference signal, and described phaselocked loop exports two-way
Reference clock signal, wherein one road reference clock signal inputs broadband frequency synthesizer after crystal filter filtering；Another
After road reference clock signal amplifies through bandpass signal filter filtering, amplifier, frequency divider divides, input Direct Digital frequency is closed
Grow up to be a useful person, described Direct Digital Frequency Synthesizers provide the reference clock letter of phase-adjustable, frequency-adjustable to IF-FRE synthesizer
Number.
Further, temperature compensating crystal oscillator is 10MHz temperature compensating crystal oscillator, and described voltage-controlled oscillator controls for 100MHz voltage
Agitator, described phaselocked loop exports 100MHz reference clock signal；This 100MHz reference clock signal is divided into two-way, wherein one tunnel
Reference clock signal inputs broadband frequency synthesizer after crystal filter filtering, and another road reference clock signal carries through 1GHz
Messenger wave filter extracts its 10 order harmonic components, and after producing the clean 1GHz frequency signal of frequency spectrum, more amplified device amplifies, divides
Frequency device frequency dividing produces 500MHz frequency signal, and this 500MHZ frequency signal closes as reference clock signal input Direct Digital frequency
Grow up to be a useful person, described Direct Digital Frequency Synthesizers provide the reference clock letter of phase-adjustable, frequency-adjustable to IF-FRE synthesizer
Number, this reference clock signal frequency range is 119.5MHz～120.5MHz, and frequency resolution is up to 0.1Hz, phase adjustment essence
Spend for 0.2 degree.
Further, broadband frequency synthesizer includes No. two phase discriminators, active loop wave filter, broadband voltage control
Agitator processed, radio frequency amplifier, controlled source, radio frequency hilted broadsword four throw switch and braodband directional coupler, described reference clock mould
The reference clock signal that block provides and the RF local oscillator signal of braodband directional coupler coupled end feedback reflect through No. two phase discriminators
It is divided into N road signal, every road signal controls agitator to adjust through a broadband voltage respectively after phase, active loop filter filtering
Frequently, a radio frequency amplifier is connected with an input of radio frequency hilted broadsword four throw switch after amplifying, and described radio frequency hilted broadsword four-throw is opened
The outfan closing is connected with braodband directional coupler input, and described braodband directional coupler leads directly to end and exports needed for this frequency source
RF local oscillator signal, RF local oscillator signal is fed back to No. two phase discriminators by described braodband directional coupler coupled end；Described No. two
Phase discriminator, active loop wave filter control agitator and a radio frequency amplifier to be combined into N road with a broadband voltage respectively
Cover the frequency synthesizer of different frequency range, and the selection of frequency range is controlled by controlled source and radio frequency hilted broadsword four-throw on-off circuit, institute
State controlled source to be connected with processor of single chip computer by data/address bus with radio frequency hilted broadsword four throw switch.The preferred N=3 of the present invention, and three
Road band frequency scope is 2.8-4.2GHz respectively, 4.2-5.5GHz, 5.5-6GHz.
Further, to include No. three phase discriminators, passive low pass loop filter, medium frequency electric voltage-controlled for IF-FRE synthesizer
Agitator processed and intermediate frequency amplifier；Described No. three phase discriminators, passive low pass loop filter, medium frequency electric voltage-controlled oscillator and in
Audio amplifier forms intermediate frequency phase-lock frequency synthesizer, and the surge frequency range of medium frequency electric voltage-controlled oscillator is 1.195～
1.205GHz.
Further, Direct Digital Frequency Synthesizers, No. two phase discriminators and No. three phase discriminators pass through data/address bus and list
Piece machine processor is connected.
Beneficial effect：
（1）Because LTE channel simulator radio circuit needs to realize the function of phase-adjustable, when present invention employs reference
Clock phase-adjustable, to realize the purpose of IF-FRE synthesizer phase-adjustable, reduce further and is applied to LTE channel simulator
Frequency synthesizer complexity, and achieve the accurately adjustable function of phase place, phase adjustment precision can reach 2 degree.
（2）The wide band implementation method of common broadband frequency synthesizer typically has following several method：The first is exactly
First design a frequency synthesizer with certain bandwidth, wide band realization is by complicated frequency multiplication, frequency dividing, wave filter
Group, on-off circuit etc. are realized, and the implementation method of this broadband circuit is complicated, and phase noise specifications are poor, output spectrum spuious
Component is especially many；Second method is directly to be realized with a wide band voltage-controlled oscillator, although circuit realiration is simple
Single, but the phase noise specifications of output are poor.The device that the present invention adopts, had both avoided complicated frequency multiplication, frequency dividing circuit band
That comes is spuious big, the complicated feature of circuit, solves single broadband VCO again and realizes wide-band filter phase noise specifications difference
Shortcoming, employs three independent voltage-controlled oscillators, carries out the switching of different frequency locking by hilted broadsword four throw switch, with
Realize the performance of broadband, low complex degree, low phase noise.
（3）The realization of wide band radio-frequency frequency synthesizer broadband character of the present invention is to be controlled by three wide band radio-frequency voltages to shake
Swing device and share a phase-lock frequency synthesizer circuit realiration, be characterized in that circuit is simple, low in energy consumption, good performance indexes.
（4）In radio circuit in order to realize the precise control to phase place it will usually in sending and receiving letter machine insertion the phase shifter with
Realize phase adjustment.Using different phase shifter schemes, Phasing is also different, and analog phase shifter bandwidth of operation is narrow；
Digital control phase shifter operational frequency bandwidth can somewhat wide point, but phase shifting accuracy is not high enough, typically typical phase shifting accuracy
It is 6.25 degree.The scheme that the present invention adopts is to insert the frequency synthesizer of an intermediate frequency phase-adjustable, this frequency in mixing link
The phase adjustment precision of rate synthesizer can reach 2 degree, high precision, and implementation method simple it is not necessary in receiver and sender
In be all inserted into complexity phase-shift circuit, further reduce LTE channel simulator frequency synthesizer complexity.
Brief description
The frequency synthesizer architecture figure being applied in LTE channel simulator that Fig. 1 provides for the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is further described.
As illustrated, a kind of frequency source being applied to LTE channel simulation emulator that the present invention provides, there is radio frequency output
Broadband, Low phase noise, the feature of intermediate frequency phase-adjustable.This frequency source include reference clock module, broadband frequency synthesizer and
IF-FRE synthesizer.Frequency synthesizer is the core component of radio frequency and microwave system, has in communication, radar and electronic countermeasure
There is pivotal role, its key technical indexes is frequency band, mutually noise, spuious, frequency resolution etc..
（1）Reference clock module
Reference clock module provides required clock signal, to the two of wide band radio-frequency frequency synthesizer to whole frequency source
Number phase discriminator 12 provides the phase noise specifications of a 100MHz high reference clock signal, to ensure that broadband rf frequency closes
Output module of growing up to be a useful person exports low phase noise characteristic；Simultaneously also by Direct Digital Frequency Synthesizers 10 produce a phase-adjustable,
The signal of frequency-adjustable, this signal provides reference clock to IF-FRE synthesizer, can be finely tuned with realizing intermediate frequency output frequency,
The adjustable purpose of phase place.
The realization of described reference clock module is to provide clock reference by 10MHz temperature compensating crystal oscillator 1 to whole frequency origin system
Signal, number phase discriminator 2 of this 10MHz signal input, phase discriminator 2, passive loop filter 3, the control of 100MHz voltage are shaken
Swing device 4 and frequency divider 5 forms a phaselocked loop, it is high that this phaselocked loop can produce high frequency stability, phase noise specifications
100MHz reference clock, and circuit realiration low cost.This 100MHz reference clock is divided into two-way, and a road signal is through crystal filter
After device 6 filtering, unnecessary harmonic wave and spurious components are filtered out, provide reference clock to wide band radio-frequency frequency synthesizer module
Signal；Another road signal takes its 10 order harmonic components, i.e. 1GHz signal, by a 1GHz bandpass signal wave filter 7, produces frequency
Compose clean 1GHz frequency signal, then amplify through amplifier 8, frequency divider 9 frequency dividing produces the signal of 500MHz, this 500MHZ believes
Number still there is high frequency stability, Low phase noise, provide clock signal, Direct Digital to Direct Digital Frequency Synthesizers 10
Frequency synthesizer 10 produce frequency resolution height, a frequency signal for phase-adjustable, frequency range be 119.5MHz～
120.5MHz, frequency resolution is 0.2 degree up to 0.1Hz, phase adjustment precision, and this Direct Digital Frequency Synthesizers 10 can be given
IF-FRE synthesizer provides clock signal, and to realize IF-FRE high resolution, the purpose of phase adjustment, this example directly counts
The preferred AD9959 digital frequency synthesizer of word frequency synthesizer 10.
（2）Broadband frequency synthesizer
Broadband frequency synthesizer part can produce a wide band signal, provides broadband to penetrate for LTE channel simulator
Frequency local oscillation signal, provides the Low phase noise of 100MHz, the reference clock of high frequency stability, this clock signal by reference clock module
It is divided into three road signals after No. two phase discriminator 12 phase demodulations, active loop wave filter 13 filtering, every road signal is each wide with one
Frequency band voltage-controlled oscillator 14（Or 15,16）Frequency modulation and a radio frequency amplifier 17（Or 18,19）The independent frequency of signal composition
Rate synthesizer, frequency range is 2.8-4.2GHz respectively, 4.2-5.5GHz, 5.5-6GHz.Which is determined by processor of single chip computer
One loop work, is realized by controlled source 27,28,29 and radio frequency hilted broadsword four throw switch 20, and a remaining input port connects
50 ohm of matched loads, the outfan of radio frequency hilted broadsword four throw switch 20 is connected with braodband directional coupler 21 input, and broadband is fixed
Lead directly to wide band radio-frequency local oscillation signal needed for the output frequency source of end to bonder 21, broadband frequency synthesizer output in this example
2.8～6.0GHZ wide band radio-frequency local oscillation signal；21 1 coupled end of braodband directional coupler will export wide band radio-frequency local oscillation signal
Feed back to No. two phase discriminators 12, another coupling 50 ohm of matched loads of termination.So that broadband frequency synthesizer is integrally formed
One frequency synthesizer of phase locking structure.Wherein, in order to simplify the complexity of circuit, the design of broadband frequency synthesizer is abandoned
The frequency multiplication of complexity, frequency dividing, filter circuit, in order to ensure the feature of frequency synthesizer output low phase noise index, circuit does not have yet
There is the frequency synthesizer controlling agitator realization using a broadband voltage, to obtain preferable phase noise specifications.
（3）IF-FRE synthesizer
The frequency synthesizer of intermediate frequency phase-adjustable provides intermediate frequency local oscillator signal for LTE channel simulator, and its realization is mainly
Form one by No. three phase discriminators 22, passive low pass loop filter 23, medium frequency electric voltage-controlled oscillator 24 and intermediate frequency amplifier 25
Individual intermediate frequency phase-lock frequency synthesizer, wherein, the surge frequency range of medium frequency electric voltage-controlled oscillator 24 is 1.195～
1.205GHz, the reference clock of this frequency synthesizer is provided by Direct Digital Frequency Synthesizers 10, and reference clock scope is
119.5MHz～120.5MHz, Direct Digital Frequency Synthesizers 10 are connected with processor of single chip computer 26 by data/address bus, thus
Realize IF-FRE synthesizer frequency resolution high, phase-adjustable, therefore the IF-FRE resolution of output is also high, enables simultaneously
The performance of phase-adjustable.This example IF-FRE synthesizer exports 1.195～1.205GHZ local oscillation signal.
The frequency source processor of single chip computer 26 that the present invention provides is also by data/address bus and 12, No. three phase demodulations of No. two phase discriminators
Device 22 is connected, thus directly controlling the phase-locked loop structures of broadband frequency synthesizer and IF-FRE synthesizer, realizes frequency source
Automatically adjustable.
The above be only the preferred embodiment of the present invention it should be pointed out that：Ordinary skill people for the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of broadband frequency source being applied to LTE channel simulator it is characterised in that：This frequency source includes reference clock mould
Block, broadband frequency synthesizer and IF-FRE synthesizer；
Described reference clock module, for providing fixed reference clock signal to broadband frequency synthesizer, is additionally operable to intermediate frequency
Frequency synthesizer provides phase-adjustable, the reference clock signal of frequency-adjustable；
Described broadband frequency synthesizer, the reference clock signal for being provided according to reference clock module generates LTE channel mould
Intend RF local oscillator signal needed for device；Described broadband frequency synthesizer includes No. two phase discriminators (12), active loop wave filter
(13), broadband voltage control agitator (14,15,16), controlled source (27,28,29), radio frequency amplifier (17,18,19),
Radio frequency hilted broadsword four throw switch (20) and braodband directional coupler (21), described broadband voltage control agitator (14,15,16) by
Controlled source (27,28,29) directly controls, reference clock signal and braodband directional coupler that described reference clock module provides
(21) the RF local oscillator signal of coupled end feedback divides after No. two phase discriminator (12) phase demodulations, active loop wave filter (13) filtering
For N road signal, every road signal is respectively through broadband voltage control agitator (14,15 or 16) frequency modulation, a radio frequency amplification
Device (17,18 or 19) is connected with an input of radio frequency hilted broadsword four throw switch (20) after amplifying, and described radio frequency hilted broadsword four-throw is opened
The outfan closing (20) is connected with braodband directional coupler (21) input, and described braodband directional coupler (21) leads directly to end output
RF local oscillator signal needed for this frequency source, RF local oscillator signal is fed back to No. two by described braodband directional coupler (21) coupled end
Phase discriminator (12)；
Described No. two phase discriminators (12), active loop wave filter (13) control agitator (14,15 with a broadband voltage respectively
Or 16) and radio frequency amplifier (17,18 or 19) be combined into the frequency synthesizer that N road covers different frequency range, and the choosing of frequency range
Select and controlled by controlled source (27,28,29) and radio frequency hilted broadsword four throw switch (20) circuit, described controlled source (27,28,29) and
Radio frequency hilted broadsword four throw switch (20) is connected with processor of single chip computer (26) by data/address bus；
Described IF-FRE synthesizer, the reference clock signal for being provided according to reference clock module generates LTE channel simulation
Intermediate frequency local oscillator signal needed for device.
2. a kind of broadband frequency source being applied to LTE channel simulator according to claim 1 it is characterised in that：Described
Reference clock module includes temperature compensating crystal oscillator (1), described temperature compensating crystal oscillator (1) to phase discriminator (2), passive loop filter (3),
The phaselocked loop that voltage-controlled oscillator (4) and frequency divider (5) form provides clock reference signal, and described phaselocked loop exports two LUSHEN
Examine clock signal, wherein one road reference clock signal inputs broadband frequency synthesizer after crystal filter (6) filtering；Another
Road reference clock signal filters through bandpass signal wave filter (7), amplifier (8) amplifies, frequency divider (9) inputs after dividing and directly counts
Word frequency synthesizer (10), described Direct Digital Frequency Synthesizers (10) provide phase-adjustable, frequency to IF-FRE synthesizer
Adjustable reference clock signal.
3. a kind of broadband frequency source being applied to LTE channel simulator according to claim 2 it is characterised in that：Described
Temperature compensating crystal oscillator (1) is 10MHz temperature compensating crystal oscillator, and described voltage-controlled oscillator (4) is 100MHz voltage-controlled oscillator, described lock
Phase ring exports 100MHz reference clock signal；This 100MHz reference clock signal is divided into two-way, wherein one road reference clock signal
Input broadband frequency synthesizer after crystal filter (6) filtering, another road reference clock signal is filtered through 1GHz bandpass signal
Ripple device (7) extracts its 10 order harmonic components, and after producing the clean 1GHz frequency signal of frequency spectrum, more amplified device (8) amplifies, divides
Device (9) frequency dividing produces 500MHz frequency signal, and this 500MHZ frequency signal inputs Direct Digital frequency as reference clock signal
Synthesizer (10), described Direct Digital Frequency Synthesizers (10) adopt AD9959 digital frequency synthesizer, and close to IF-FRE
Offer frequency range of growing up to be a useful person is the reference clock signal of 119.5MHz～120.5MHz.
4. a kind of broadband frequency source being applied to LTE channel simulator according to claim 1 it is characterised in that：Described N
=3, and three road band frequency scopes are 2.8-4.2GHz respectively, 4.2-5.5GHz, 5.5-6GHz.
5. a kind of broadband frequency source being applied to LTE channel simulator according to claim 3 it is characterised in that：Described
IF-FRE synthesizer includes No. three phase discriminators (22), passive low pass loop filter (23), medium frequency electric voltage-controlled oscillator
And intermediate frequency amplifier (25) (24)；Described No. three phase discriminators (22), passive low pass loop filter (23), voltage of intermediate frequency control are shaken
Swing device (24) and intermediate frequency amplifier (25) composition intermediate frequency phase-lock frequency synthesizer.
6. a kind of broadband frequency source being applied to LTE channel simulator according to claim 5 it is characterised in that：Described
The surge frequency range of medium frequency electric voltage-controlled oscillator (24) is 1.195～1.205GHz.
7. a kind of broadband frequency source being applied to LTE channel simulator according to claim 5 it is characterised in that：Described
Direct Digital Frequency Synthesizers (10), No. two phase discriminators (12) and No. three phase discriminators (22) pass through data/address bus and single-chip microcomputer process
Device (26) is connected.
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| CN105007178B (en) * | 2015-06-11 | 2018-04-24 | 武汉鑫诚欣科技有限公司 | A kind of method for cordless communication network fault locator |
| CN104954017B (en) * | 2015-06-12 | 2021-07-06 | 中国电子科技集团公司第四十一研究所 | Frequency synthesizer of LTE air interface monitor |
| CN105356878B (en) * | 2015-12-04 | 2018-06-15 | 东南大学 | A kind of implementation method and device of improved tricyclic wideband frequency synthesizer |
| CN106231777B (en) * | 2016-07-29 | 2019-01-29 | 中国原子能科学研究院 | A kind of signal source of high stability of superconducting cyclotron |
| CN109088634B (en) * | 2018-07-13 | 2022-03-29 | 东南大学 | Low-phase-noise broadband microwave frequency source circuit |
| CN113114239B (en) * | 2021-04-19 | 2024-02-27 | 南京先进激光技术研究院 | Method and system for expanding frequency difference locking dynamic range of optical phase-locked loop |
| CN116647232A (en) * | 2023-07-26 | 2023-08-25 | 成都世源频控技术股份有限公司 | Frequency source synthesis circuit for improving frequency hopping time |
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| JP5666709B2 (en) * | 2010-09-13 | 2015-02-12 | クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ | Method, apparatus and computer program product for facilitating use of LTE channelization structures and waveforms for peer-to-peer communication |
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| CN101686502A (en) * | 2008-09-26 | 2010-03-31 | 大唐移动通信设备有限公司 | Method, system and device for providing large transmission bandwidth for long-term evolution broadband system |
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