CN109981135A - Terahertz is the same as transmitting-receiving full duplex multi-carrier communications systems - Google Patents
Terahertz is the same as transmitting-receiving full duplex multi-carrier communications systems Download PDFInfo
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- CN109981135A CN109981135A CN201910329882.9A CN201910329882A CN109981135A CN 109981135 A CN109981135 A CN 109981135A CN 201910329882 A CN201910329882 A CN 201910329882A CN 109981135 A CN109981135 A CN 109981135A
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
Abstract
The invention discloses Terahertzs with transmitting-receiving full duplex multi-carrier communications systems, which realizes the transmitting and reception of terahertz signal in same radio-frequency front-end；The system includes Terahertz antenna, Terahertz radio-frequency front-end, intermediate-frequency circuit and baseband circuit；The Terahertz radio-frequency front-end includes Terahertz bandpass filter, Terahertz orthomode coupler, Terahertz sub-harmonic mixer and Terahertz frequency multiplication link；The intermediate-frequency circuit includes emission medium-frequency circuit and reception intermediate-frequency circuit；The baseband circuit includes the road N DAC and the road N ADC；Wherein, N is the positive integer more than or equal to 2.Present invention employs Multicarrier Transmission Technologies, and the frequency spectrum resource of Terahertz channel is rationally utilized, and in the case where same ADC sample rate, traffic rate are improved N times, while also improving the service efficiency of frequency spectrum resource.
Description
Technical field
The present invention relates to THz communication technology fields, and in particular to Terahertz is the same as transmitting-receiving full duplex multi-carrier communication system
System.
Background technique
THz wave refers to electromagnetic wave of the frequency between 100GHz to 10THz.This section of electromagnetic spectrum is in tradition electricity
Son learns the specific position between photonics research frequency range, and the past studies it and develop and use all relatively fewer.With nothing
The high speed development of line communication, existing frequency spectrum resource have become increasingly deficient, and the new frequency range for developing wireless communication has been increasingly becoming
A kind of this contradictory common recognition is solved, and there is the frequency spectrum resource that do not developed largely in Terahertz frequency range, so that Terahertz frequency
It is suitable for the new frequency range of future wireless system.In numerous technological approaches, nothing is realized using the technological approaches of solidstate electronics
Line communication system, future, which exists, carries out the integrated possibility of on piece for system, this moves towards practical to Terahertz wireless communication system
It is of great significance.
According to the bandwidth law of Edholm, wireless short-range communication is doubled for bandwidth demand every 18 months.The following channel radio
The development of letter to bandwidth, capacity, transmission rate demand it may be said that substantially without end, frequency spectrum resource is each national nothing
The strategic resource of shape, this resource disparities between supply and demand is very prominent at present, and demand is more and more urgent, this also just makes people will
In the past the Terahertz frequency range less focused on is transferred to the sight of new frequency resource exploitation.
Carrying out wireless communication significant advantage the most using Terahertz frequency is exactly that Terahertz frequency range is a large amount of existing absolute
Bandwidth resources.On the ground, Terahertz wireless communication is just highly suitable for the application of short distance speed wireless data transfer,
And in space, since decaying of the THz wave near vacuum environment is smaller, large capacity is carried out using THz wave
Data transmission is a kind of ideal chose of the inter-satellite networking into interplanetary communication.
Terahertz communicate other than the Inherent advantage with above-mentioned big bandwidth, also have compare microwave and millimeter wave communication with
And some advantages of laser communication.Firstly, THz wave is more shorter than millimetre wavelength, diffraction is smaller, thus directionality is stronger, together
When Terahertz frequency range ultra high bandwidth spread spectrum communication easy to accomplish, this is of great significance to secret communication.Secondly, in misty rain, mist
Under the severe environmental conditions such as haze, battlefield, light wave is compared, the decaying of THz wave is smaller, thus in specific communication distance, nature
Under condition requires, THz wave compares light wave and is easier to realize reliable communications.
Before being all made of the scheme of sending and receiving end separation, and transmitting currently based on the solid-state Terahertz communication system of semiconductor technology
End connects individual antenna, and receiving front-end connects another individual antenna, is not available the same antenna and carries out while receiving and dispatching
Function.For higher gain and good performance, the size of antenna is often bigger, if realized using traditional scheme
The volume of same transmission-receiving function, communication system front end is excessively huge, is unfavorable for the integrated of system.Meanwhile currently based on semiconductor skill
The solid-state Terahertz communication system of art is all single-carrier scheme, and is limited by the development of analog-digital converter (ADC), commercial at present
ADC chip highest only has 10Gbps, and single-carrier scheme is only capable of being unable to fully send out using frequency spectrum resource a part of in Terahertz channel
The advantage for waving the big bandwidth of Terahertz frequency band limits the traffic rate of Terahertz communication system, reduces the use of frequency spectrum resource
Efficiency.
Summary of the invention
In order to solve existing Terahertz communication system integration difference and traffic rate there are technical problems such as limitations, this
Invention provides the Terahertz to solve the above problems with transmitting-receiving full duplex multi-carrier communications systems.
The present invention is achieved through the following technical solutions:
Terahertz with transmitting-receiving full duplex multi-carrier communications systems, the system include Terahertz antenna, Terahertz radio-frequency front-end,
Intermediate-frequency circuit and baseband circuit；The Terahertz radio-frequency front-end include Terahertz bandpass filter, Terahertz orthomode coupler,
Terahertz sub-harmonic mixer and Terahertz frequency multiplication link；The intermediate-frequency circuit includes emission medium-frequency circuit and reception medium frequency electric
Road；The baseband circuit includes the road N DAC and the road N ADC；Wherein, N is the positive integer more than or equal to 2；The system is by by two-way
The receiving and transmitting signal of orthogonal mode is combined into signal all the way via Terahertz orthomode coupler, and generates mode isolation, penetrates same
The transmitting and reception of terahertz signal are realized in frequency front end.
Preferably, the emission medium-frequency circuit includes low-pass filter, multiplexer, intermediate frequency mixer and bandpass filter；N
Road DAC generates the road N modulated signal and is input to emission medium-frequency circuit, filters out respectively via the low-pass filter of emission medium-frequency circuit
Spurious signal, wherein signal is directly entered multiplexer all the way later, and in addition the road N-1 signal passes through from a intermediate frequency mixer and carries out frequency
Rate is filtered after moving by respective bandpass filter, and the multiplexer of emission medium-frequency circuit is finally entered；Multiplexer is by the road N
The signal combining of different frequency range is broadband signal all the way, is input to Terahertz radio-frequency front-end, removes through Terahertz sub-harmonic mixer
Terahertz frequency range is moved to, is isolated by Terahertz orthomode coupler with signal formation mode is received, using Terahertz band logical
Filter carries out sideband inhibition, finally by Terahertz antenna transmission to Terahertz channel.
Preferably, the reception intermediate-frequency circuit include low-noise amplifier, low-pass filter, multiplexer, intermediate frequency mixer,
Bandpass filter and high-pass filter；Terahertz antenna receives the signal of terahertz signal, via Terahertz bandpass filter pair
After garbage signal is inhibited, by Terahertz orthomode coupler enter Terahertz sub-harmonic mixer by signal move to
Intermediate-frequency band, by receiving the low-noise amplifier and low-pass filter of intermediate-frequency circuit, using the multiplexing for receiving intermediate-frequency circuit
Device is divided into the road N, and signal is demodulated by being directly entered ADC after its low-pass filter all the way；In addition the road N-1 successively passes through respectively
After crossing respective high-pass filter and intermediate frequency mixer frequency conversion, using respective low-pass filter, respective ADC is finally entered
It is demodulated.
Preferably, the intermediate-frequency circuit further includes 50MHz crystal oscillator and phase lock dielectric oscillator；Wherein 50MHz crystal oscillation signal
By phase-locked loop circuit and Terahertz frequency multiplication link, terahertz signal is generated as Terahertz sub-harmonic mixer, local oscillator drive is provided
It is dynamic.
Preferably, the Terahertz sub-harmonic mixer is used to move intermediate-freuqncy signal to Terahertz frequency range or by Terahertz
Frequency band signals are moved to intermediate-frequency band；The Terahertz orthomode coupler is used for the mutually orthogonal transmitting signal of mode and connects
The collection of letters number is combined, and generates mode isolation, prevents transmitting signal and receive signal to interfere with each other.
Preferably, the Terahertz orthomode coupler includes first port, second port and third port；Wherein, institute
It states first port and is square waveguide mouth, for passing through two orthogonal polarization mode waves；The second port and third port
For standard rectangular waveguide mouth.
Preferably, the first port of the Terahertz orthomode coupler between second port waveguiding structure narrow side,
And first port to the waveguiding structure narrow side between third port is both designed as changing along broadside.
The present invention has the advantage that and the utility model has the advantages that
1, the present invention is improved in Terahertz RF front-end circuit, radio-frequency front-end integrated transmission channel and reception simultaneously
Channel, frequency is identical and mode is mutually orthogonal, and using orthomode coupler (Orthomode Transducer, OMT) with
It is connected, and the receiving and transmitting signal of two-way orthogonal mode is combined into signal all the way via orthomode coupler, then orthogonal by Terahertz
Mode coupler can be realized the reception of terahertz signal, and transmitting signal can be sent to Terahertz letter via Terahertz antenna
Road.The present invention is on the basis of realizing terahertz signal can emit simultaneously with received function, transmission channel and receiving channel
Only with an antenna, the volume of communication system front end is greatly reduced, utilizes the miniaturization of system.
2, simultaneously, in order to improve the traffic rate of Terahertz communication system, the present invention is changed in front-end circuit part
Into, two-way DAC signal is moved into different frequency bands and is combined, then the signal after combining is moved into Terahertz channel, this
Invention will be led in the case where same ADC sample rate using the frequency spectrum resource that Terahertz channel is rationally utilized in multi-transceiver technology
Letter rate improves N times, while also improving the service efficiency of frequency spectrum resource.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is communication system principle block diagram of the invention.
Fig. 2 is dual carrier communication system principle block diagram of the invention.
Fig. 3 is Terahertz orthomode coupler structural schematic diagram of the invention.
Fig. 4 is Terahertz orthomode coupler operation principle schematic diagram of the invention.
Specific embodiment
Hereinafter, the term " includes " that can be used in various embodiments of the present invention or " may include " instruction are invented
Function, operation or the presence of element, and do not limit the increase of one or more functions, operation or element.In addition, such as existing
Used in various embodiments of the present invention, term " includes ", " having " and its cognate are meant only to indicate special characteristic, number
Word, step, operation, the combination of element, component or aforementioned item, and be understood not to exclude first one or more other
Feature, number, step, operation, element, component or aforementioned item combined presence or increase one or more features, number,
Step, operation, element, component or aforementioned item combination a possibility that.
In various embodiments of the present invention, it states "or" or " at least one of A or/and B " includes listing file names with
Any combination of text or all combinations.For example, statement " A or B " or " at least one of A or/and B " may include A, may include
B may include A and B both.
The statement (" first ", " second " etc.) used in various embodiments of the present invention can be modified in various implementations
Various constituent element in example, but respective sets can not be limited into element.For example, the above statement is not intended to limit the suitable of the element
Sequence and/or importance.The above statement is only used for the purpose for differentiating an element and other elements.For example, the first user fills
It sets and indicates different user device with second user device, although the two is all user apparatus.For example, of the invention each not departing from
In the case where the range of kind embodiment, first element is referred to alternatively as second element, and similarly, second element is also referred to as first
Element.
It should also be noted that if a constituent element ' attach ' to another constituent element by description, it can be by the first composition member
Part is directly connected to the second constituent element, and " connection " third can form between the first constituent element and the second constituent element
Element.On the contrary, when a constituent element " being directly connected to " is arrived another constituent element, it will be appreciated that in the first constituent element
And second third constituent element is not present between constituent element.
The term used in various embodiments of the present invention is used only for the purpose of describing specific embodiments and not anticipates
In limitation various embodiments of the present invention.As used herein, singular is intended to also include plural form, unless context is clear
Chu it is indicated otherwise.Unless otherwise defined, otherwise all terms (including technical terms and scientific terms) used herein have
There is meaning identical with the normally understood meaning of various embodiments of the present invention one skilled in the art.The term
(term such as limited in the dictionary generally used) is to be interpreted as having and situational meaning in the related technical field
Identical meaning and it will be interpreted as having Utopian meaning or meaning too formal, unless of the invention various
It is clearly defined in embodiment.
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment 1
The present embodiment proposes a kind of same transmitting-receiving full duplex multi-carrier communications systems of Terahertz, which includes Terahertz day
Line, Terahertz radio-frequency front-end, intermediate-frequency circuit and baseband circuit, as shown in Figure 1.
The communication system of the present embodiment realizes the transmitting and reception of terahertz signal in same radio-frequency front-end, i.e., in radio frequency
Front end integrates transmission channel and receiving channel simultaneously, and frequency is identical and mode is mutually orthogonal, and uses Terahertz orthogonal mode coupling
Clutch (Orthomode Transducer, OMT) is coupled, by the receiving and transmitting signal of two-way orthogonal mode via orthogonal mode coupling
Device is combined into signal all the way, then can be realized the reception of terahertz signal by Terahertz orthomode coupler, and can will emit
Signal is sent to Terahertz channel via Terahertz antenna.
In the present embodiment, as shown in Figure 1, the Terahertz radio-frequency front-end include Terahertz bandpass filter, Terahertz just
Hand over mode coupler, Terahertz sub-harmonic mixer and Terahertz frequency multiplication link；The intermediate-frequency circuit include emission medium-frequency circuit and
Receive intermediate-frequency circuit；The baseband circuit includes the road N DAC and the road N ADC；Wherein, N is the positive integer more than or equal to 2.
In the present embodiment, the emission medium-frequency circuit includes the road N low-pass filter (LPF), the road N-1 intermediate frequency mixer, N-1
Road bandpass filter (BPF) and multiplexer；The road N DAC generates the road N modulated signal and is input in emission medium-frequency circuit
Reason: after the road N signal filters out spurious signal by respective low-pass filter respectively, the 1st road signal is directly entered multiplexer, the
The road 2~N signal also carries out entering back into multiplexer (the i.e. road N DAC and N after frequency translation respectively by respective intermediate frequency mixer
Road low-pass filter is arranged in a one-to-one correspondence, and the road 2~N DAC and the road N-1 intermediate frequency mixer and N-1 bandpass filter are corresponded
Setting)；The modulated signal combining of the obstructed frequency range in the road N is broadband signal all the way by multiplexer, is input to Terahertz radio-frequency front-end
In handled: all the way broadband signal through Terahertz sub-harmonic mixer all the way carry out frequency translation to Terahertz frequency range after,
It is isolated by Terahertz orthomode coupler with signal formation mode is received, prevents receiving and transmitting signal from interfering with each other, using terahertz
Hereby bandpass filter inhibits unwanted sideband, realizes single sideband transmission, finally transmits a signal to by Terahertz antenna
Terahertz channel forms terahertz signal transmission channel.Low-pass filter (LPF) in the emission medium-frequency circuit is to base band
The spurious signal of the signal of DAC output is effectively inhibited, and prevents spurious signal from interfering system.
In the present embodiment, the reception intermediate-frequency circuit includes the road N low-pass filter (LPF), the road N-1 intermediate frequency mixer, N-1
Road high-pass filter (HPF), multiplexer and low-noise amplifier；Terahertz antenna receives the useful signal of terahertz signal, warp
It crosses Terahertz bandpass filter to inhibit garbage signal, it is humorous to enter Terahertz point all the way by Terahertz orthomode coupler
Wave mixing device moves signal to intermediate-frequency band, via intermediate frequency low-noise amplifier, is divided into the road N, the first via using duplexer
Be directly entered ADC after the filtering of its low-pass filter and demodulated, the road 2~N successively pass through respective high-pass filter and
After intermediate frequency mixer is converted to suitable frequency range, using respective low-pass filter, finally enters respective ADC and demodulated
(i.e. the road the road N ADC and N low-pass filter is arranged in a one-to-one correspondence, and the road 2~N ADC and the road N-1 intermediate frequency mixer and N-1 high pass are filtered
Wave device is arranged in a one-to-one correspondence), that is, form terahertz signal receiving channel.
In another preferred embodiment, the also settable mid-frequency low-pass filtering between low-noise amplifier and duplexer
Device LPF (is not shown) in attached drawing 1, for filtering out to the spurious signal for receiving signal.It is low in the reception intermediate-frequency circuit
Bandpass filter prevents spurious signal to system for effectively being inhibited to the spurious signal in the signal for being input to base band ADC
It is interfered.The low-noise amplifier is for amplifying received intermediate-freuqncy signal.
In the present embodiment, the intermediate-frequency circuit further includes 50MHz crystal oscillator and phase lock dielectric oscillator (Phase-locked
Dielectric Resonator Oscillator,PDRO)；Wherein, 50MHz crystal oscillation signal passes through phase-locked loop circuit (Phase
Locked Loop, PLL), millimeter-wave signal is generated as intermediate frequency mixer, and local oscillator driving is provided；The wherein letter that 50MHz crystal oscillator generates
Number via phase lock dielectric oscillator (Phase-locked Dielectric Resonator Oscillator, PDRO) and terahertz
Hereby frequency multiplication link generates terahertz signal as Terahertz sub-harmonic mixer and provides local oscillator driving, and driving Terahertz subharmonic is mixed
Effective work of frequency device.
In the present embodiment, the Terahertz sub-harmonic mixer in transmission channel is used to move intermediate-freuqncy signal to Terahertz frequency
Section (upconversion function)；Terahertz sub-harmonic mixer in receiving channel is for moving Terahertz frequency range signal into again and again
Section (frequency down-conversion function).The effect of the Terahertz orthomode coupler is by the mutually orthogonal transmitting signal of mode and to receive letter
It number is combined, and generates mode isolation, prevent transmitting signal and receive signal to interfere with each other；The Terahertz bandpass filtering
Device filters out the unwanted sideband for the double-sideband signal that frequency mixer generates, and carries out sideband inhibition, prevents another sideband signals pair
Communication system impacts.
The communication system of the present embodiment can be emitted and be connect simultaneously realizing terahertz signal by double hair full duplex modes
On the basis of the function of receipts, transmission channel and receiving channel greatly reduce communication system front end only with an antenna
Volume utilizes the miniaturization of system.
The communication system of the present embodiment additionally uses Multicarrier Transmission Technology, and the frequency spectrum money of Terahertz channel is rationally utilized
Traffic rate is improved N times in the case where same ADC sample rate by source, while also improving the use effect of frequency spectrum resource
Rate.And in order to realize single sideband transmission, the present embodiment uses sideband suppression technology, i.e., after the frequency mixer of transmitter and receiver
Frequency mixer before increase Terahertz bandpass filter, a sideband is effectively inhibited, it is therefore prevented that two sidebands are sent out simultaneously
The waste of energy caused by penetrating, while also avoiding the waste of signaling channel resource.
Embodiment 2
Based on the above embodiment 1, with transmitting-receiving full duplex dual carrier communication system, i.e., the present embodiment proposes a kind of Terahertz
When N=2, as shown in Figure 2.
The communication system of the present embodiment can be achieved at the same time transmitting and receive the dual function of signal, and system composition includes too
Hertz antenna, Terahertz RF front-end part, intermediate-frequency circuit part and baseband portion.
Wherein Terahertz RF front-end part includes Terahertz bandpass filter, Terahertz orthomode coupler, Terahertz
Sub-harmonic mixer and Terahertz frequency multiplication link.Two-way DAC generates two-way modulated signal respectively and is input to intermediate frequency dual carrier
Circuit filters out spurious signal via the LPF (low-pass filter) of intermediate-frequency circuit, wherein signal is carried out by intermediate frequency mixer all the way
The combining of the modulated signal of two-way different frequency range is broadband signal all the way using duplexer, is input to terahertz by frequency translation
Hereby RF front-end part, signal of communication enter Terahertz sub-harmonic mixer and move to Terahertz frequency range, by Terahertz OMT with
The isolation of signal formation mode is received, prevents receiving and transmitting signal from interfering with each other, carries out sideband inhibition using Terahertz bandpass filter,
Finally Terahertz channel is transmitted to by signal is emitted by Terahertz antenna；
The useful signal that circuit is received Terahertz channel by Terahertz antenna is wherein received, by Terahertz bandpass filter
Garbage signal is inhibited, enters Terahertz sub-harmonic mixer by Terahertz OMT and moves signal to intermediate-frequency band, warp
It crosses intermediate frequency low noise and mid-frequency low-pass filter (low-pass filter is not shown in attached drawing 2) filters out spurious signal, using double
Work device is divided into two-way, is directly entered ADC1 by low-pass filter all the way and is demodulated, another way successively passes through high frequency filter
It is converted to after suitable frequency range with intermediate frequency mixer through finally entering ADC2 and being demodulated by low-pass filter.
Embodiment 3
Based on the above embodiment 1 and embodiment 2, the present embodiment also the structure of Terahertz orthomode coupler has been carried out excellent
Change design.As shown in Figure 3.
The structure of the Terahertz orthomode coupler (Terahertz OMT) of the present embodiment is as shown in figure 3, include an input unit
It is divided to (port 1), two output par, cs (port 2 and port 3) and orthogonal separation part.Two orthogonal polarization from port 1
Mode wave (horizontal polarization and vertical polarization) exports vertically polarized wave from port 2 by polarization separation structure and transition structure,
From 3 output level polarized wave of port, as shown in Figure 4.Certainly, reversely using also possible, port 2 and port 3 are mutual not shadows
Loud.Port 1 is square waveguide mouth, and port 2 and port 3 are standard rectangular waveguide mouth, WR-4, having a size of 1.092mm ×
0.546mm。
The propagation field of main mould TE10 wave is related with the broadside of waveguide, and unrelated with narrow side.In order to reduce insertion loss, protect
The continuity of waveguide long side Yu corresponding polarization mode is held.By reducing the width of narrow side, the isolation of orthogonal mould is enhanced, such as
Shown in Fig. 3.The a quarter of circular waveguide is used to adjust the direction of propagation of vertically polarized wave.Since the distance of port 1 to port 3 is big
In arriving port 2, so energy loss is also larger.Therefore the comparison of the Transition Design from port 1 to port 3 is slow, is not a mark
Quasi- isosceles trapezoid.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (7)
1. Terahertz is the same as transmitting-receiving full duplex multi-carrier communications systems, which is characterized in that the system includes Terahertz antenna, Terahertz
Radio-frequency front-end, intermediate-frequency circuit and baseband circuit；The Terahertz radio-frequency front-end includes that Terahertz bandpass filter, Terahertz are orthogonal
Mode coupler, Terahertz sub-harmonic mixer and Terahertz frequency multiplication link；The intermediate-frequency circuit includes emission medium-frequency circuit and connects
Receive intermediate-frequency circuit；The baseband circuit includes the road N DAC and the road N ADC；Wherein, N is the positive integer more than or equal to 2；The system is logical
It crosses and the receiving and transmitting signal of two-way orthogonal mode is combined into signal all the way via Terahertz orthomode coupler, and generate mode isolation,
The transmitting and reception of terahertz signal are realized in same radio-frequency front-end.
2. Terahertz according to claim 1 is the same as transmitting-receiving full duplex multi-carrier communications systems, which is characterized in that the transmitting
Intermediate-frequency circuit includes low-pass filter, multiplexer, intermediate frequency mixer and bandpass filter；The road N DAC generates the road N modulated signal
It is input to emission medium-frequency circuit, filters out spurious signal via the low-pass filter of emission medium-frequency circuit respectively, later wherein all the way
Signal is directly entered multiplexer, and in addition the road N-1 signal is after carrying out frequency translation from a intermediate frequency mixer through by respective band
Bandpass filter is filtered, and finally enters the multiplexer of emission medium-frequency circuit；The signal of the road N different frequency range is combined by multiplexer
Broadband signal all the way is input to Terahertz radio-frequency front-end, moves through Terahertz sub-harmonic mixer to Terahertz frequency range, by too
Hertz orthomode coupler is isolated with signal formation mode is received, and carries out sideband inhibition using Terahertz bandpass filter, most
Afterwards by Terahertz antenna transmission to Terahertz channel.
3. Terahertz according to claim 2 is the same as transmitting-receiving full duplex multi-carrier communications systems, which is characterized in that the reception
Intermediate-frequency circuit includes low-noise amplifier, low-pass filter, multiplexer, intermediate frequency mixer, bandpass filter and high-pass filter；
Terahertz antenna receives the signal of terahertz signal, after inhibiting via Terahertz bandpass filter to garbage signal, warp
It crosses Terahertz orthomode coupler and enters Terahertz sub-harmonic mixer and move signal to intermediate-frequency band, by receiving medium frequency electric
The low-noise amplifier and low-pass filter on road are divided into the road N using the multiplexer for receiving intermediate-frequency circuit, and signal passes through it all the way
ADC is directly entered after low-pass filter to be demodulated；In addition respective high-pass filter and intermediate frequency are successively passed through in the road N-1 respectively
After frequency mixer frequency conversion, using respective low-pass filter, finally enters respective ADC and demodulated.
4. Terahertz according to claim 1-3 is the same as transmitting-receiving full duplex multi-carrier communications systems, which is characterized in that
The intermediate-frequency circuit further includes 50MHz crystal oscillator and phase lock dielectric oscillator；Wherein 50MHz crystal oscillation signal by phase-locked loop circuit with
Terahertz frequency multiplication link generates terahertz signal as Terahertz sub-harmonic mixer and provides local oscillator driving.
5. Terahertz according to claim 4 is the same as transmitting-receiving full duplex multi-carrier communications systems, which is characterized in that the terahertz
Hereby sub-harmonic mixer by intermediate-freuqncy signal for moving to Terahertz frequency range or moving Terahertz frequency range signal to intermediate-frequency band；
The Terahertz orthomode coupler is used to for the mutually orthogonal transmitting signal of mode and reception signal being combined, and generates mould
Formula isolation prevents transmitting signal and receives signal to interfere with each other.
6. Terahertz according to claim 4 is the same as transmitting-receiving full duplex multi-carrier communications systems, which is characterized in that the terahertz
Hereby orthomode coupler includes first port, second port and third port；Wherein, the first port is square waveguide
Mouthful, for passing through two orthogonal polarization mode waves；The second port and third port are standard rectangular waveguide mouth.
7. Terahertz according to claim 6 is the same as transmitting-receiving full duplex multi-carrier communications systems, which is characterized in that the terahertz
Hereby the first port of orthomode coupler between second port waveguiding structure narrow side and first port to third port it
Between waveguiding structure narrow side be both designed as changing along broadside.
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