CN109905139B - Multichannel near field information transmission system based on programmable super surface - Google Patents
Multichannel near field information transmission system based on programmable super surface Download PDFInfo
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- CN109905139B CN109905139B CN201910090336.4A CN201910090336A CN109905139B CN 109905139 B CN109905139 B CN 109905139B CN 201910090336 A CN201910090336 A CN 201910090336A CN 109905139 B CN109905139 B CN 109905139B
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Abstract
The invention discloses a multichannel near-field information transmission system based on a programmable super surface, which comprises the programmable super surface and a digital control unit, wherein the programmable super surface consists of a plurality of bit digital units which are periodically arranged, and a scattered field of the whole super surface is the superposition of scattered fields of all the digital units. When the digitally encoded state of each cell is changed, the overall orofacial fringe field changes. Therefore, designing different combinations of orofacial encoding can control the energy distribution of scattered waves. The system provided by the invention realizes the multichannel direct transmission of near-field information by utilizing the spatial domain and time domain characteristics of the programmable super surface to electromagnetic waves, does not need a separate phase shifter and a signal modulator, greatly simplifies the system and saves the cost for system development. The method is expected to be widely applied to near-field information transmission and signal processing.
Description
Technical Field
The invention belongs to the field of novel artificial electromagnetic media, and particularly relates to a programmable super-surface-based multi-channel near-field information transmission system.
Background
In a traditional information transmission system, the modulation processing of signals is completed in a baseband circuit part, and then the signals are radiated outwards through an antenna after being subjected to up-conversion; and complex signal processing technology and expensive hardware architecture are often required for the purpose of multi-channel information transmission.
The programmable super surface is a digital reconfigurable artificial electromagnetic surface and consists of a large number of digital reconfigurable artificial units with sub-wavelengths. Since the scattered field of the super-surface is a superposition of scattered fields of all cells, the characteristics of the electromagnetic field at a specific spatial position can be controlled by changing the state distribution of the cells. The scheme of the novel system transmitter based on the programmable super surface encodes a baseband signal on the control voltage of each subunit of the metamaterial and simultaneously realizes direct information modulation and direct beam control.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides a multi-channel near-field information transmission system based on a programmable super surface, which realizes multi-channel direct transmission of near-field information without a separate phase shifter and a signal modulator, greatly simplifies the system and saves the cost for system development.
The technical scheme is as follows: the multichannel near-field information transmission system based on the programmable super surface is characterized by comprising the programmable super surface and a digital control unit, wherein the programmable super surface is composed of a plurality of one-bit digital units which are periodically arranged, a controlled device is integrated in the one-bit digital unit, all controlled devices on the programmable super surface are combined in different states under the control of the digital control unit, so that a programmable interface is formed, the programmable interface comprises near-field graphs formed by all controlled devices in different state combinations and interface codes corresponding to the near-field graphs, and the interface codes realize independent information transmission of a plurality of information transmission channels through dynamic switching.
Preferably, the number of channels for information transmission is the number of energy focuses formed by the near field pattern.
Preferably, each information transmission channel formed by the face-to-face coding can independently transmit information.
Preferably, the near field pattern can complete assignment of all information transmission channels at the same time.
Preferably, the information of the plurality of information transmission channels at the same time is independent from each other and corresponds to a unique set of face codes.
Preferably, the information of the plurality of information transmission channels at the same time determines the orofacial coding at that time, and the information is transferred by time domain switching of the orofacial coding.
Preferably, the system further comprises a transmitting terminal and a receiving terminal which are provided with the programmable super surface, and the transmitting side and the receiving side transmit information and exchange data through a multi-channel formed by the programmable interface in a preset near field range.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the system provided by the invention realizes the multichannel direct transmission of near-field information by utilizing the spatial domain and time domain characteristics of the programmable super surface to electromagnetic waves, does not need a separate phase shifter and a signal modulator, greatly simplifies the system and saves the cost for system development. The method is expected to be widely applied to near-field information transmission and signal processing.
Drawings
FIG. 1 is a schematic diagram of a one-bit digital cell of a programmable super surface;
FIG. 2 is a top view of the structure of a one-bit digital cell of a programmable super surface;
FIG. 3 is a bottom view of the structure of a one-bit digital cell of the programmable super surface;
FIG. 4 is a schematic diagram of a phase frequency curve of a programmable super surface;
FIG. 5 is a schematic amplitude-frequency curve of a programmable super-surface;
FIG. 6 is a diagram illustrating the correspondence between the orofacial code and the near field pattern in accordance with the present invention;
FIG. 7 is a schematic diagram of dynamic switching of the orofacial coding according to the present invention;
FIG. 8 is a schematic diagram of multi-channel information transmission according to the present invention;
fig. 9 is a diagram illustrating test results of the multi-channel information transmission illustrated in fig. 8.
Detailed Description
The multi-channel near-field information transmission system based on the programmable super surface comprises the programmable super surface and a digital control unit, wherein the programmable super surface is composed of a plurality of one-bit digital units which are periodically arranged, a controlled device is integrated in the one-bit digital unit, and all the controlled devices on the programmable super surface are combined in different states under the control of the digital control unit, so that a programmable interface surface is formed.
In one embodiment, the controlled device exhibits two different electromagnetic steady states at two different bias voltages, labeled "1" and "0". The digital control unit is a time bias voltage for each one-bit digital unit, and different bias voltages enable the one-bit digital unit to realize real-time switching between two electromagnetic stable states to form different state combinations. When the digital control unit writes different control words into the artificial super surface, different codes can be carried out on the one-bit digital unit, so that near field graphs corresponding to different combinations of the mouth-to-face codes and different states of all the one-bit digital units under different bias voltages are formed. The oral-facial coding realizes independent information transmission of different channels through dynamic switching, and realizes different control of electromagnetic waves.
When the digital control unit is used specifically, the digital control unit can write the required control word, and the number of paths and the number of bits of the control word are determined by the requirement of information transmission; when the programmable super surface collects the written control words, corresponding face codes and near-field graphs can be presented, and the face codes are multi-bit codes obtained by writing the control words on the programmable super surface in a multi-path mode in the same time sequence.
The invention will be further described with reference to the accompanying drawings.
Fig. 1-3 are schematic diagrams of the structure of a programmable super surface. Where fig. 1 shows the bottom metal layer as a dc feed structure, as shown in fig. 3, the fan-shaped structure is to prevent rf signals from coupling into the dc feed line. The intermediate metal layer is a barrier. The middle layer and the top layer metal structure layer form a rectangular detection waveguide structure which can detect an energy focus of the aperture surface coding, so that the energy of the scattered field is converged to a specified one or more near-field positions. The top layer is connected with the sector center of the bottom layer through a metal through hole so as to feed the diode with direct current voltage, wherein the geometric parameters of each part are marked.
Programmable super-surface cell structures typically incorporate actively controllable devices or materials such as diodes, MEMS, liquid crystals or vanadium dioxide. Preferably, the present invention employs a diode as the controlled device. Each unit structure comprises three metal layers and two dielectric layers and can be realized by a common multilayer circuit board manufacturing process. The top metal layer is a specially designed metal structure pattern and is integrated with a switch diode; the middle metal layer is a metal reflecting surface; the bottom metal surface is a direct current feeder. Two dielectric layers are arranged between the three metal layers. The direct current voltage controls the on-off of the switch diode through a direct current feeder line on the bottom layer. The programmable super surface can ensure that the reflection phase with the phase difference of 180 degrees can be obtained at the designed frequency point, and the specific structure form can be obtained according to simulation.
The on-off state of the diode is controlled by the direct current voltage. In both states, the entire cell exhibits different reflection coefficients, as shown in fig. 4 and 5. It can be seen that the reflection amplitudes of the two states differ less, but the reflection phase changes more. At 10GHz, the two reflections are 180 degrees out of phase. If the reflected phase when the diode is on is considered to be a "1" state and the reflected phase when the diode is off is considered to be a "0" state, then such a cell can be considered to be a one-bit digital cell.
With such a one-bit digital unit, a programmable face can be composed. Different control of electromagnetic waves can be realized by controlling the state combination of different units on the programmable port surface. The near-field pattern generates a plurality of focuses for the face code, namely the near-field pattern is near-field energy distribution corresponding to the super-surface face code, and the number of channels for information transmission is the number of the focuses of the near-field energy.
The scattered field of the whole super surface is the superposition of the scattered fields of all one-bit digital units. When the digitally encoded state of each cell is changed, the overall orofacial fringe field changes. Therefore, designing different combinations of orofacial encoding can control the energy distribution of scattered waves.
Each focus is a communication link, which is a channel, and what information can be arbitrarily defined as to what information is transmitted. The information here refers to the amplitude variation of the focus, i.e. the 0 and 1 sequence, with high amplitude representing 1 and low amplitude representing 0.
Any information to be transmitted can be represented as a certain sequence of 0 and 1, the sequences can be transmitted through the amplitude change of the focus, and the receiving end can identify the sequences of 0 and 1 after receiving the signal with the amplitude change, thereby completing the transmission of the information.
In order to realize multichannel near-field information transmission, the time-varying aperture coding can be designed, so that the energy of a scattered field is converged to a specified near-field position or positions, and when a rectangular detection waveguide structure detects at the convergent points, the received signal intensity is modulated by the coding state of the super-surface aperture, thereby realizing the multichannel near-field information transmission.
FIG. 6 is a design of a programmable port surface, where each small square on the port surface represents a one-bit digital cell, and the gray small square represents the cell in "1" state, i.e., the diode is in conducting state; the small white square represents the cell in the "0" state, i.e. the diode is in the off-state. As can be seen from fig. 6, different orofacial encodings achieve independent control of the amplitudes of the three foci of the near field, the orofacial encoding being a multi-bit encoding derived from control words that are multiplexed onto the programmable super surface within the same time sequence. The symbol "1" is transmitted when the field strength of a certain focus is high, otherwise the symbol "0" is transmitted. Therefore, information can be independently transmitted in different channels. When a one-bit symbol is transmitted in three separate channels, there are eight states in the near-field pattern. Accordingly, there are 8 distributions of orofacial coding for the programmable surface. In the practical application of the method, the material is,
in order to realize multi-channel information transmission, the dynamic switching of the interface coding is required. The switching of the orofacial coding depends on the information transmitted by each channel. In one embodiment, fig. 7 and 8 show a switching scheme. The symbols in the three channels for each facet coding are given below the time axis in fig. 7, and when the coding schemes are switched in the order in fig. 7, the signals transmitted in each channel are as shown in fig. 8. The signal transmitted in Channel 1(Channel1) is "10101010 …"; the signal transmitted in Channel 2(Channel2) is "01100110 …"; the signal transmitted in Channel 3(Channel3) is "00010001 …".
Fig. 9 is a signal test result of each channel. FIGS. 9a-9c correspond to channel1 in FIG. 8; FIGS. 9d-9f correspond to channel2 in FIG. 8; fig. 9g-9i correspond to channel3 in fig. 8. The first column is the actually measured sampling signal, the second column is the signal after symbol amplitude envelope extraction through Hilbert transform, and the third column is the signal after threshold decision. It can be seen that the signal transmitted by each channel is identical to the signal designated to be transmitted. The signal transmission of multiple channels can be directly realized by utilizing the spatial domain and time domain modulation characteristics of the programmable super surface.
In one embodiment, the system further comprises a transmitting terminal and a receiving terminal, wherein the transmitting terminal and the receiving terminal are installed on the programmable super surface, and the transmitting side and the receiving side carry out information transmission and data exchange through a multi-channel formed by the programmable interface surface within a preset near-field range.
Any one party of the transceiving terminal is an active communication party, the other party of the transceiving terminal is a passive communication party, and the active communication party sends information corresponding to the face code of the active communication party to the passive communication party through multiple channels;
after the passive communication party collects the calling signal, the passive communication party makes a response according to the calling signal;
the active communication party receives the reply signal.
The system utilizes the spatial domain and time domain characteristics of the programmable super surface to electromagnetic waves to realize the multichannel direct transmission of near-field information, and compared with the traditional multichannel information transmission system, the system provided by the invention does not need a separate phase shifter and a signal modulator, thereby greatly simplifying the system and saving the cost for system development. The near field information transmission and signal processing device is expected to be widely applied to near field information transmission and signal processing.
Claims (5)
1. A multi-channel near-field information transmission system based on a programmable super surface is characterized by comprising a programmable super surface and a digital control unit, wherein the programmable super surface is composed of a plurality of one-bit digital units which are periodically arranged, a controlled device is integrated in the one-bit digital unit, all controlled devices on the programmable super surface are combined in different states under the control of the digital control unit, so that a programmable interface is formed, the programmable interface comprises near-field patterns formed by all controlled devices in different state combinations and interface codes corresponding to the near-field patterns, and the interface codes realize independent information transmission of a plurality of information transmission channels through dynamic switching; the number of information transmission channels is the number of energy focuses formed by the near-field pattern, and information of a plurality of information transmission channels at the same time is mutually independent and corresponds to a unique group of oral surface codes.
2. The programmable super surface-based multi-channel near-field information transmission system as claimed in claim 1, wherein each information transmission channel formed by the orofacial coding can independently transmit information.
3. The programmable super surface-based multi-channel near-field information transmission system as claimed in claim 1, wherein the near-field pattern completes assignment of all information transmission channels at the same time.
4. The programmable super-surface based multi-channel near-field information transmission system as claimed in claim 1, wherein the information of the plurality of information transmission channels at the same time determines the orofacial coding at the time, and the information is transferred by time domain switching of the orofacial coding.
5. The system of any one of claims 1 to 4, further comprising a transmitting terminal and a receiving terminal for mounting the programmable super surface, wherein both the transmitting terminal and the receiving terminal are in a preset near field range and perform information transmission and data exchange through a multi-channel formed by the programmable interface.
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| CN110380211B (en) * | 2019-07-22 | 2021-05-11 | 南京大学 | Liquid crystal metamaterial antenna array for terahertz wave beam regulation and control |
| CN110855341B (en) * | 2019-11-05 | 2023-02-28 | 东南大学 | Integrated beam forming and signal modulation method based on digital programmable super surface |
| CN111478030B (en) * | 2020-04-07 | 2023-09-19 | 东南大学 | Reconfigurable sum and difference beam forming system and method |
| CN111542054B (en) * | 2020-05-08 | 2023-01-06 | 南京大学 | Secure communication method and system based on programmable super surface |
| CN112881815A (en) * | 2021-01-22 | 2021-06-01 | 北京航空航天大学 | Programmable super-surface reflective array-based field simulator |
| CN114362800B (en) * | 2022-01-05 | 2022-10-04 | 浙江大学 | Active and passive information symbiotic transmission method based on discrete phase intelligent super-surface system |
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| CN104078771A (en) * | 2014-07-17 | 2014-10-01 | 东南大学 | Digital programmable super surface |
| CN106486784A (en) * | 2016-11-30 | 2017-03-08 | 江苏赛博防务技术有限公司 | Mirror antenna array and beam sweeping method |
| CN108900233A (en) * | 2018-04-17 | 2018-11-27 | 东南大学 | Direct radiation radio digital communication system and method based on digital coding Meta Materials |
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| CN104078771A (en) * | 2014-07-17 | 2014-10-01 | 东南大学 | Digital programmable super surface |
| CN106486784A (en) * | 2016-11-30 | 2017-03-08 | 江苏赛博防务技术有限公司 | Mirror antenna array and beam sweeping method |
| CN108900233A (en) * | 2018-04-17 | 2018-11-27 | 东南大学 | Direct radiation radio digital communication system and method based on digital coding Meta Materials |
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