CN106154381A - Two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder - Google Patents
Two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder Download PDFInfo
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- CN106154381A CN106154381A CN201610592121.9A CN201610592121A CN106154381A CN 106154381 A CN106154381 A CN 106154381A CN 201610592121 A CN201610592121 A CN 201610592121A CN 106154381 A CN106154381 A CN 106154381A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1866—Transmission gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
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- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
The present invention relates to a kind of two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder, it is characterized in that, encoder is the annulus metal grating flat board of the two-dimentional buphthalmos structure that two sides couples symmetry completely, it is a round tube hole at annulus metal grating plate center, two surfaces up and down of annulus metal grating flat board are provided with the annulus that the symmetrical two-dimentional concentric periodic of coupling arranges, the periodic width of the grating being made up of annulus is identical, and the groove width of metal grating flat board each donut groove laterally zygomorphic is identical with groove depth.The annulus sequence of concentric periodic arrangement from the center to the periphery on annulus metal grating flat board is according to the order arrangement of cdma system time domain binary sequence, the corresponding donut groove of " 1 " code, the corresponding structureless metal plate of " 0 " code.Being applicable to Terahertz section cdma system time domain, it is extremely low that this structure has energy loss；Simple in construction, parameter is easy to adjust；Easy making process, the advantage such as with low cost.
Description
Technical field
The present invention relates to a kind of signal processing technology, particularly to a kind of two dimension buphthalmos structure Terahertz cdma system time domain
Encoder.
Background technology
Cdma system is the communication system based on code division (spread spectrum) technology and multiple access technology, and system is that each user distributes respectively
From particular address code.There is between address code mutual quasi-orthogonality, thus can be overlapping in time, space and frequency；Will
Need the information data transmitting to carry out time domain/frequency domain modulation by a pseudo noise code, make the time domain/frequency domain of original data-signal
Width is expanded, and receiving terminal carries out contrary process, de-spreads, and enhances jamproof ability.
Cdma communication net is to be combined into by several technology such as spread spectrum, multiple access and channelings, containing frequency domain, time domain and code
A kind of cooperation that territory three dimensional signal is processed, therefore it to have anti-interference good, anti-multipath fading, secret and safe is high, same frequency
Can reuse in multiple regions, the characteristics such as trade-off between capacity and quality, can be done.
Coder/decoder is one of core component in cdma system, is one of most important factor affecting systematic function.
The structure of coder/decoder and characteristic directly influence the user capacity of cdma system, the bit error rate, power attenuation, operating cost with
And the flexibility etc. of system.The cost of manufacture of coder/decoder, the factor such as adjustability and coding/decoding performance decides cdma system
Actual application can be put into.
At present, CDMA technology has been used widely at microwave frequency band, optical frequency frequency range also obtain substantial amounts of research and
By test run.But in Terahertz frequency range also always blank, the reason that one of them is critically important do not have exactly with low cost and
Reliable coder/decoder.
Content of the invention
The present invention be directed to CDMA technology and be always blank problem in Terahertz frequency range, it is proposed that a kind of two dimension the eye splice
Structure Terahertz cdma system time-domain encoder and decoder, it is adaptable to Terahertz section cdma system time domain, parameter is easy to adjust, energy
Amount loss is extremely low.
The technical scheme is that a kind of two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder,
Encoder is the annulus metal grating flat board of the two-dimentional buphthalmos structure that two sides couples symmetry completely, annulus metal grating
Being a round tube hole at plate center, two surfaces up and down of annulus metal grating flat board are provided with the symmetrical two-dimentional concentric periodic of coupling
The annulus of arrangement, the periodic width of the grating being made up of annulus is identical, metal grating flat board each donut laterally zygomorphic
The groove width of groove is identical with groove depth.
The annulus sequence of concentric periodic arrangement from the center to the periphery on described annulus metal grating flat board is according to CDMA system
System time domain binary sequence order arrangement, the corresponding donut groove of " 1 " code, the corresponding structureless metal plate of " 0 " code.
The operating center frequency of described Terahertz cdma system and bandwidth are respectively by the annulus of two dimension concentric periodic arrangement
Periodic width and periodicity determine.
Described two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder, THz wave is from annulus metal light
After grid flat board upper vertical is incident, on annulus metal grating flat board two sides with the form of surface plasma-wave from outer shroud symmetrical coupled
Strengthen and simultaneously propagate to center circle through hole, the donut groove of annulus metal grating realizes time domain coding or decoding, and
Eventually in through center circle through hole with a very small divergence angle outgoing.
The beneficial effects of the present invention is: present invention two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoding
Device, it is extremely low that this structure has energy loss；Simple in construction, parameter is easy to adjust；Easy making process, the advantage such as with low cost.
Brief description
Fig. 1 is present invention two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder is overlooked and profile；
Fig. 2 is present invention two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder schematic diagram.
Detailed description of the invention
The present invention proposes time-domain encoder and decoder, this coding of a kind of two dimension buphthalmos structure Terahertz cdma system
Device and decoder work in Terahertz frequency range, and two dimension buphthalmos structure Terahertz cdma system time-domain encoder is conciliate as shown in Figure 1
Code device is overlooked and profile, overlook understand encoder by from the center to the periphery one by one donut form, then see
Corresponding section, annulus order determines chip sequence (" 0 " on metal grating flat board according to coding or the decoding order of cdma system
The corresponding structureless metal plate of code, the corresponding donut groove of " 1 " code, " 0 " code is identical with the periodic width p of " 1 " code, only
" 1 " code has groove, groove width w and groove depth t)；The operating center frequency of Terahertz cdma system and bandwidth are respectively by the week of chip
Phase width (centre frequency f0=c/p, in formula, c is the light velocity in vacuum, p donut periodic width) and periodicity (bandwidth deltaf f
With periodicity k negative correlation) determine；And use the form transmission of surface plasma wave (SPPs) to reduce loss；Metal is put down
The selection of plate thickness s should be thin as far as possible on the premise of ensureing mechanical strength, to guarantee the surface plasma on metallic plate two sides
Ripple SPPs can couple enhancing.
Two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder, its structure is two-sided full symmetric
The metal grating slab construction of two dimension buphthalmos structure.Structure centre has the round tube hole of an a diameter of d, has a series of around round tube hole
The symmetrical two-dimentional concentric codings ring groove of upper and lower surface.This encoder is operated in Terahertz frequency range, as shown in Figure 2
Shown in schematic diagram, the plane that input THz wave is perpendicular to metal plate coding grating place is incident (arbitrarily square in this plane
To polarization), strengthen in metal both sides with the form symmetrical coupled of surface plasma-wave (SPPs) and propagate to center circle through hole,
Time domain coding or decoding, and finally through on metal center circle through hole is realized in the donut groove of metal grating
With a very small divergence angle outgoing.If its center operating frequency of oblique incidence will change (spectral peak will be split into two:θ is the angle in incidence wave direction and this plane normal direction).
Loss and the angle of divergence on surface plasma wave for the material of metal plate own affects very little, typically selects
Low-cost metal such as aluminium etc..
This encoder is in the corresponding structureless metal plate of binary " 0 " code, the corresponding two-sided coupling of " 1 " code
Symmetrical grating donut groove；THz wave increases with the form symmetrical coupled of surface plasma-wave (SPPs) in metal both sides
By force and propagate to center circle through hole, thus in the groove trap structure of metal grating, realize the time domain of " 0 " " 1 " binary sequence
Coding or decoding, and finally through on metal center circle through hole outgoing.
The present invention can use different processing technologys to be realized, such as machining, electrochemical erosion method processing, plating
Film processing etc..
In one particular embodiment of the present invention, design parameter is as follows: metal plate center circle through-hole diameter d=
120um, flat board gross thickness s=300um；Donut depth of groove t=60um, periodic width p=440um, groove width w=
220um (i.e. w/p=0.5)；Corresponding center operating frequency f0=0.68THz.It is distributed k sequence chip around center circle through hole
Structure (the corresponding structureless metal plate of " 0 " code, the corresponding donut groove of " 1 " code).Such as time domain coding sequence is
0100111(N0……N7=0100111), i.e. around 7 two-sided coupling code elements of center circle through hole distribution 0100111；So right
Decoding sequence is answered to be 1110010 (the high-low-position inverted order codes of i.e. 0100111).
Claims (4)
1. a two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder, it is characterised in that encoder is conciliate
Code device is the annulus metal grating flat board of the two-dimentional buphthalmos structure that two sides couples symmetry completely, at annulus metal grating plate center
Being a round tube hole, two surfaces up and down of annulus metal grating flat board are provided with the circle that the symmetrical two-dimentional concentric periodic of coupling arranges
Ring, the periodic width of the grating being made up of annulus is identical, the groove of metal grating flat board each donut groove laterally zygomorphic
Wide identical with groove depth.
2. two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder according to claim 1, its feature exists
In the annulus sequence of concentric periodic arrangement from the center to the periphery on described annulus metal grating flat board is according to cdma system time domain
Binary sequence order arrangement, the corresponding donut groove of " 1 " code, the corresponding structureless metal plate of " 0 " code.
3. two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder according to claim 2, its feature exists
In the operating center frequency of described Terahertz cdma system and bandwidth are respectively by the cycle width of the annulus of two dimension concentric periodic arrangement
Degree and periodicity determine.
4. according to any one in claims 1 to 3, two dimension buphthalmos structure Terahertz cdma system time-domain encoder is conciliate
Code device, it is characterised in that THz wave is after annulus metal grating flat board upper vertical is incident, at annulus metal grating flat board two
Face strengthens from outer shroud symmetrical coupled with the form of surface plasma-wave and propagates to center circle through hole, same at annulus metal grating
Heart ring groove realizes time domain coding or decoding, and finally goes out with a very small divergence angle in through center circle through hole
Penetrate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610592121.9A CN106154381A (en) | 2016-07-26 | 2016-07-26 | Two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder |
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| CN201610592121.9A CN106154381A (en) | 2016-07-26 | 2016-07-26 | Two dimension buphthalmos structure Terahertz cdma system time-domain encoder and decoder |
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Cited By (2)
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| CN108732122A (en) * | 2017-04-13 | 2018-11-02 | 南京理工大学 | A kind of terahertz imaging accurate positioning method based on surface plasmons |
| CN108802038A (en) * | 2018-08-28 | 2018-11-13 | 京东方科技集团股份有限公司 | Light source assembly and micro-total analysis system |
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| US20090002608A1 (en) * | 2002-07-24 | 2009-01-01 | Nitto Denko Corporation | Polarizer, optical film using the same, and image display device using the same |
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| CN101568863A (en) * | 2007-01-31 | 2009-10-28 | 日东电工株式会社 | Connection combination type optical film, liquid crystal panel, image display device, and liquid crystal display device |
| JP2008203738A (en) * | 2007-02-22 | 2008-09-04 | Dainippon Printing Co Ltd | Medium for determining authenticity, article having the same, label, transfer sheet and transfer foil for the same |
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| CN108732122A (en) * | 2017-04-13 | 2018-11-02 | 南京理工大学 | A kind of terahertz imaging accurate positioning method based on surface plasmons |
| CN108802038A (en) * | 2018-08-28 | 2018-11-13 | 京东方科技集团股份有限公司 | Light source assembly and micro-total analysis system |
| US11213822B2 (en) | 2018-08-28 | 2022-01-04 | Boe Technology Group Co., Ltd. | Light source assembly and micro total analysis system |
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