CN111130574B - MIMO transmitter based on programmable super surface - Google Patents
MIMO transmitter based on programmable super surface Download PDFInfo
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- CN111130574B CN111130574B CN201911324299.5A CN201911324299A CN111130574B CN 111130574 B CN111130574 B CN 111130574B CN 201911324299 A CN201911324299 A CN 201911324299A CN 111130574 B CN111130574 B CN 111130574B
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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
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0483—Transmitters with multiple parallel paths
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a MIMO transmitter based on a programmable super surface, which comprises a digital baseband signal processing link, a digital-to-analog converter, a programmable super surface and a radio frequency carrier signal source, wherein the programmable super surface comprises K groups of electromagnetic micro units; the digital baseband signal processing link maps the K paths of digital baseband signals into corresponding K paths of digital control signals, the K paths of digital control signals are converted into K paths of analog control signals through K digital-to-analog converters respectively, the K paths of analog control signals are loaded on K groups of electromagnetic micro units in the programmable super surface respectively, and the programmable super surface generates corresponding K paths of modulation wave signals under the irradiation of a carrier wave generated by a radio frequency carrier signal source. The maximum value of K is the number of the programmable super-surface electromagnetic micro units, namely, each electromagnetic micro unit transmits one path of independent modulation wave signal, and super large-scale MIMO signal transmission is realized. The MIMO transmitter is built based on the programmable super surface, and has the characteristics of simple structure, low cost, light weight and low power consumption.
Description
Technical Field
The invention relates to a programmable super-surface-based MIMO transmitter, and belongs to the technical field of wireless communication and new artificial electromagnetic materials.
Background
MIMO technology is one of the key technologies for contemporary mobile communication. The MIMO system can more fully utilize space resources by using a plurality of antennas to erect a plurality of communication channels at the transmitting end and the receiving end, and improves the throughput rate and the spectrum utilization rate of the system. Currently, massive MIMO technology and super massive MIMO technology, which have evolved from MIMO technology, have been one of the popular technologies in 5G and 6G research. One of the bottlenecks in implementing the MIMO technology at present is that when a traditional superheterodyne or zero intermediate frequency architecture is adopted to build the MIMO transmitter, each transmitting channel needs a corresponding radio frequency link including a mixer, a radio frequency power amplifier and the like, and as the number of the transmitting channels increases, the hardware design complexity of the transmitter also increases, and the cost also increases greatly.
The super surface is a novel artificially synthesized electromagnetic material and has wide application in various fields such as communication to microwave and the like. The super-surface is generally constructed by arranging a series of artificial electromagnetic unit structures with sub-wavelength dimensions in a regular array in a spatial region, and by designing the geometric structure, size and arrangement of the artificial units, electromagnetic effects which some conventional materials do not have can be achieved. The super-surface generally controls the reflection wave or the transmission wave through the super-normal reflection coefficient or the transmission coefficient thereof, and thus has the capability of controlling the electromagnetic wave to realize modulation. The MIMO transmitter for wireless communication is built by using the super surface, and modulation can be directly realized on the super surface, so that a traditional radio frequency link is not needed, the method is a new idea for designing the wireless communication transmitter, and has a huge application prospect in the field of super large-scale MIMO wireless communication in the future.
Disclosure of Invention
Aiming at the problems of complex structural design and high cost of the existing MIMO wireless communication transmitter, the MIMO transmitter based on the programmable super surface is provided with simple structure, low cost, light weight and low power consumption, and the multi-path modulation wave transmission is realized at the transmitting end based on the super surface.
The invention adopts the following technical scheme for solving the technical problems:
a MIMO transmitter based on programmable super surface comprises a digital baseband signal processing link, a digital-to-analog converter, a programmable super surface and a radio frequency carrier signal source, wherein the programmable super surface comprises K groups of electromagnetic micro units;
the digital baseband signal processing link maps the K paths of digital baseband signals into corresponding K paths of digital control signals, the K paths of digital control signals are converted into K paths of analog control signals through K digital-to-analog converters respectively, the K paths of analog control signals are loaded on K groups of electromagnetic micro units in the programmable super surface respectively, and the K groups of electromagnetic micro units in the programmable super surface generate corresponding K paths of modulation wave signals under the irradiation of a carrier wave generated by a radio frequency carrier signal source;
the acquisition process of the K paths of digital control signals comprises the following steps: firstly, according to the digital modulation mode adopted by the transmitter, the normalized amplitude and phase sequence of K paths of modulation wave signals corresponding to K paths of digital baseband signals are calculated, the normalized amplitude and phase sequence of the K paths of modulation wave signals are also the amplitude and phase modulation coefficient sequence of corresponding K groups of electromagnetic micro units, and then according to the characteristic that the amplitude and phase modulation coefficients of the electromagnetic micro units are regulated and controlled by control signals, the K paths of digital control signals corresponding to the amplitude and phase modulation coefficient sequence of the K groups of electromagnetic micro units are calculated.
As a further technical solution of the present invention, the programmable super surface is a transmissive or reflective super surface, and correspondingly, the modulated wave signal is a transmitted wave or a reflected wave of the programmable super surface.
As a further technical scheme of the invention, the programmable super surface is composed of M rows and N columns of electromagnetic micro units which are periodically arranged, each electromagnetic micro unit is independently regulated and controlled by an analog control signal, J adjacent electromagnetic micro units are divided into one group, M multiplied by N electromagnetic micro units are divided into K groups, each group of electromagnetic micro units is respectively connected with one path of analog control signal, and J is a natural number more than or equal to 1.
As a further technical solution of the present invention, the electromagnetic microcell is composed of a substrate, a microstructure disposed on the substrate, and an adjustable element, wherein the microstructure is a metal microstructure or a semiconductor microstructure or a graphene microstructure or a compound microstructure, and the adjustable element is a capacitor, an inductor, a resistor, a diode, or a combination thereof.
As a further technical scheme of the invention, the analog control signal is voltage or current, the electromagnetic micro unit dynamically controls the reflection coefficient or the transmission coefficient of the electromagnetic micro unit through the analog control signal loaded on the adjustable element of the electromagnetic micro unit, and further controls the amplitude and the phase of the reflected wave or the transmitted wave of the programmable super surface, namely
Wherein Em,nIs the incident wave of the electromagnetic micro-unit in the m row and the n column,
reflected wave or transmitted wave of electromagnetic microcell in m-th row and n-th column，Am,nAnd
the amplitude and phase modulation coefficients of the electromagnetic micro-units in the mth row and the nth column are respectively, wherein M is 1,2, …, and M, N is 1,2, …, N.
As a further technical solution of the present invention, the radio frequency carrier signal source is a single tone carrier signal source.
As a further technical scheme of the invention, the carrier generated by the radio frequency carrier signal source is transmitted by the feed source antenna after being amplified by power and irradiates on the programmable super surface.
As a further technical scheme of the invention, the carrier generated by the radio frequency carrier signal source vertically irradiates or obliquely irradiates on the super surface.
As a further technical solution of the present invention, a modulation method of the K-path modulation wave signal is a digital amplitude-phase modulation method of PSK or QAM.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. low design complexity, low cost, light weight and low power consumption. In the traditional transmitter architecture such as superheterodyne and zero intermediate frequency, a mixer is needed after a digital baseband signal is converted into an analog signal, the analog signal and a local oscillator signal are mixed and converted into a radio frequency signal which can be transmitted by an antenna, and then the radio frequency signal is amplified by radio frequency power and transmitted, so when a traditional transmitter architecture is used for building a multi-antenna transmitter, each transmitting channel generally needs a corresponding mixer and a radio frequency power amplifier, a large number of mixers and radio frequency power amplifiers are expensive in manufacturing cost, and the design and the use of a multi-antenna transmitting system are more complicated;
the MIMO multi-antenna transmitter based on the programmable super surface can directly use the analog control signal to control the super surface to load information on a carrier wave to generate a modulated wave, does not need a mixer and a multi-channel radio frequency power amplifier, can greatly reduce the cost and the complexity of the transmitter, and has lighter integral weight and lower power consumption;
2. the number of transmitting channels can be flexibly configured. The MIMO multi-antenna transmitter based on the programmable super surface can flexibly configure the division of the super surface to form a corresponding number of transmitting channels according to requirements, when the number of the channels of the transmitter needs to be changed, the electromagnetic micro units of the super surface only need to be divided again, and then the electromagnetic micro units of the super surface are reconnected to the corresponding digital baseband link channels, so that the use is more flexible.
Drawings
FIG. 1 is a schematic diagram of the transmitter architecture of the method of the present invention.
FIG. 2 is a schematic diagram of a programmable super surface of the method of the present invention.
FIG. 3 is a schematic diagram of the grouping of electromagnetic microcells according to the method of the present invention.
FIG. 4 is a schematic diagram of the structure of an electromagnetic microcell of a programmable super surface according to the method of the present invention.
Fig. 5 is a schematic diagram of 16QAM constellation mapping for the baseband data processing link of the method of the present invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
The programmable super surface is formed by a series of sub-wavelength artificial electromagnetic micro units with programmable characteristics which are periodically arranged in space, and the size, the material and the structure of the electromagnetic micro units and the adopted adjustable elements jointly determine the electromagnetic characteristics of the programmable super surface. The programmable super surface can dynamically change the electromagnetic characteristics of the electromagnetic micro unit under the control of an external signal, specifically the reflection coefficient or the transmission coefficient of the electromagnetic micro unit, so that the amplitude and the phase of a reflected wave or a transmitted wave of the super surface can be controlled by the external signal, and the electromagnetic wave modulation can be realized by utilizing the amplitude and the phase. Then, a plurality of communication channels can be constructed by controlling the electromagnetic micro units on the super surface in a grouping way, and multi-channel transmission based on the super surface is realized.
The invention realizes the modulation and the transmission of multiple channels by utilizing the programmable super surface and builds the multi-channel MIMO transmitter based on the programmable super surface. Fig. 1 is a schematic diagram of a MIMO transmitter architecture based on programmable super-surface. The invention comprises a digital baseband signal processing link, a digital-to-analog converter, a programmable super surface and a radio frequency carrier signal source, wherein the radio frequency carrier signal source generates an incident carrier of the programmable super surface, the incident carrier is emitted and irradiated on the programmable super surface through a feed source antenna, the digital baseband signal processing link maps K paths of digital baseband signals to be transmitted into corresponding K paths of digital control signals of the programmable super surface, the digital control signals are converted into K paths of analog control signals through the digital-to-analog converter and loaded on corresponding K groups of electromagnetic micro units of the programmable super surface, and the programmable super surface is controlled by control signals under the irradiation of the carrier to directly generate corresponding K paths of modulation wave signals. In fig. 1, the programmable super surface is composed of M rows and N columns of electromagnetic micro units, each electromagnetic micro unit of the programmable super surface is connected to one path of analog control signal, each electromagnetic micro unit transmits one path of modulated wave signal, and the whole programmable super surface realizes M · N paths of modulated wave signal transmission.
A schematic diagram of the structure of a programmable super surface used in the present invention is shown in fig. 2. The programmable super surface adopted in practical application can be a transmission super surface or a reflection super surface. The programmable super surface is composed of M rows and N columns of electromagnetic micro units which are periodically arranged, and each electromagnetic micro unit can be independently regulated and controlled. J adjacent electromagnetic micro units of the programmable super surface are divided into one group, M multiplied by N electromagnetic micro units are divided into K groups, each group of electromagnetic micro units is respectively connected with one path of control signal, and the whole programmable super surface is connected to the K paths of control signals, so that the K channels can be transmitted. The electromagnetic micro units of the super surface can be flexibly grouped according to the number of channels required, when each electromagnetic micro unit is connected with a control signal of one channel of digital-to-analog converter, the number of the channels is the largest, namely each electromagnetic micro unit can transmit one channel of modulation signals, and the MIMO transmitter of the M & N channel is realized.
Fig. 3 shows a programmable super surface with 8 rows and 8 columns of electromagnetic microcells, wherein 4 columns of electromagnetic microcells in each 4 rows are divided into one group, and the super surface is divided into 4 groups, so that 4-channel emission can be realized. It should be understood that this is only an illustration, and the number of the electromagnetic microcells of the programmable super surface, the specific spatial arrangement and the dividing manner of the electromagnetic microcells are not limited thereto, and can be flexibly designed according to the actual requirements.
As shown in fig. 4, the electromagnetic microcell is composed of a substrate, a microstructure disposed on the substrate, and an adjustable element, wherein the microstructure is a metal microstructure or a semiconductor microstructure or a graphene microstructure or a compound microstructure, and the adjustable element may be an element such as a resistor, a capacitor, an inductor, or a diode. It should be understood that this is only an illustration, the structure of the programmable super-surface electromagnetic micro-unit can be designed according to the working frequency band of the transmitter and the electromagnetic wave control effect required to be achieved, and in the field of metamaterials, systematic methods are already provided to assist in designing the super-surface electromagnetic micro-unit through electromagnetic software simulation.
When a control signal is applied to the tunable element, the electromagnetic properties of the tunable element are affected, and thus the electromagnetic response of the electromagnetic microcell is affected, which is expressed as the reflection coefficient or the transmission coefficient of the electromagnetic microcell. The amplitude and phase of the reflected or transmitted wave can then be controlled by means of a control signal, i.e.
Wherein Em,nThe incident wave of the electromagnetic micro-unit of the mth row and nth column of the programmable super surface is a single-tone carrier signal in the invention,
is a reflected or transmitted wave of the electromagnetic microcell, Am,nAnd
the amplitude and phase modulation coefficients of the electromagnetic micro unit can be dynamically regulated and controlled by a control signal of the electromagnetic micro unit.
The data flow of the invention is as follows: firstly, a digital baseband signal processing link maps K paths of digital baseband signals into corresponding K paths of digital control signals, the K paths of digital control signals are converted into K paths of analog control signals through K digital-to-analog converters respectively, the K paths of analog control signals are loaded on K groups of electromagnetic micro units in a programmable super surface respectively, and the programmable super surface generates corresponding K paths of modulation wave signals under the irradiation of a carrier wave generated by a radio frequency carrier signal source. Each path of digital baseband signal is respectively mapped into an independent path of digital control signal, the digital control signal is converted into an analog control signal through a digital-to-analog converter and loaded on a corresponding group of electromagnetic micro units, and under the irradiation of a carrier wave generated by a radio frequency carrier signal source, the control signal modulates the amplitude phase of a reflected wave or a transmitted wave of the group of electromagnetic micro units to generate a corresponding path of modulated wave signal.
The acquisition process of the K paths of digital control signals comprises the following steps: firstly, according to the digital modulation mode adopted by the transmitter, the normalized amplitude and phase sequence of the K paths of modulation wave signals corresponding to the K paths of digital baseband signals are calculated, and the modulation mode of the transmitter can be any digital amplitude-phase modulation mode, including but not limited to QAM or PSK and other digital modulation modes. The normalized amplitude and phase sequence of the K-path modulation wave signals is also the amplitude and phase modulation coefficient sequence of the corresponding K groups of electromagnetic micro units, and then K paths of digital control signals corresponding to the amplitude and phase modulation coefficient sequence of the K groups of electromagnetic micro units can be calculated according to the mapping relation regulated by the amplitude and phase modulation coefficients of the electromagnetic micro units and the control signals. The mapping relation of the amplitude and phase modulation coefficients of the electromagnetic microcells and the control signal regulation is the basic characteristic of the electromagnetic microcells, the mapping relation of the amplitude and phase modulation coefficients of the electromagnetic microcells and the control signal regulation of different designs is different, and generally the mapping relation can be determined in the design stage of the electromagnetic microcells or is obtained by actual measurement after the electromagnetic microcells are processed.
For example, the transmitter adopts a 16QAM modulation scheme, and a constellation diagram of 16QAM modulation is shown in fig. 5, for example, the first 4 digital bits of one path of digital baseband signal are "0001", and according to the constellation diagram, the normalized amplitude of the modulation wave signal corresponding to "0001" is "1", and the phase is "3 pi/4", then "1 · ej3π/4' is an amplitude and phase modulation coefficient of a group of electromagnetic micro-units corresponding to the path of digital baseband signal, and then is controlled according to the electromagnetic amplitude and phase modulation coefficientMapping relation of system signal to obtain amplitude and phase modulation coefficient' 1 · ej3π/4"corresponding digital control signal, the digital control signal value depends on whether the analog control signal of the electromagnetic microcell is a voltage or a current, the digital control signal is a voltage value V if the analog control signal is a voltage, and the digital control signal is a current value I if the analog control signal is a current. And then mapping all digital bits of the path of digital baseband signal according to the process to obtain a path of digital control signal, wherein K paths of digital baseband signals can obtain K paths of digital control signals.
And then K paths of digital control signals are converted into analog control signals through a digital-to-analog converter and loaded on the corresponding K groups of electromagnetic micro units on the super surface, and the electromagnetic micro units on the super surface generate K paths of modulation signals in corresponding modulation modes under the irradiation of radio frequency carriers. The signal received at the reception point P can be represented as
Wherein
In order to receive the signal received by the point P,
the modulated reflected wave or transmitted wave h of the electromagnetic micro-unit of the m row and n column of the super surfacem,n(P) is the channel response of the electromagnetic microcell to the reception point P. The above formula can be expressed according to the grouping mode of the super-surface electromagnetic micro-units
Wherein
Is a reflected wave or a transmitted wave, h, of the kth group of the electromagnetic micro-units on the super surfacek,j(P) is the channel response of the electromagnetic microcell to point P, Ek,jIncident wave of the kth group j of electromagnetic micro-units on the super surface, Ak,jAnd
the amplitude modulation coefficient and the phase modulation coefficient of the electromagnetic microcell are respectively.
Because the electromagnetic micro units in the same group of the super surface are connected to the same control signal, the amplitude modulation coefficient and the phase modulation coefficient of the electromagnetic micro units in the same group are the same. And because the carrier wave transmitted by the radio frequency signal source is a single-tone carrier wave, the carrier wave is transmitted by the radio frequency signal source
Wherein
And
respectively the initial amplitude and phase f of incident wave of the jth electromagnetic micro unit of the kth group of the super surfacecIs the carrier frequency. The signal received by the final receiving point P can be expressed as
Wherein
HkThe (P) means the joint channel response of all the electromagnetic micro units in the K group to P, and the visible received signal is the superposition of the transmitted signals in the K group through channels when
When the time-varying sequence is adopted, the transmitter can realize the communication of k channelsAnd transmitting the signal. The receiving end can receive and demodulate signals by using the MIMO receiver with the traditional structure.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (7)
1. A MIMO transmitter based on programmable super surface is characterized in that the transmitter comprises a digital baseband signal processing link, a digital-to-analog converter, a programmable super surface and a radio frequency carrier signal source, wherein the programmable super surface is composed of M rows and N columns of electromagnetic micro units which are periodically arranged, each electromagnetic micro unit is independently regulated and controlled by an analog control signal, J adjacent electromagnetic micro units are divided into a group, M multiplied by N electromagnetic micro units are divided into K groups, each group of electromagnetic micro units is respectively connected with one path of analog control signal, and J is a natural number which is more than or equal to 1;
the analog control signal is voltage or current, the electromagnetic micro unit dynamically controls the reflection coefficient or the transmission coefficient of the electromagnetic micro unit through the analog control signal loaded on the adjustable element of the electromagnetic micro unit, and further controls the amplitude and the phase of the reflected wave or the transmitted wave of the programmable super surface, namely
Wherein Em,nIs the incident wave of the electromagnetic micro-unit in the m row and the n column,
is a reflected wave or a transmitted wave of the electromagnetic microcells of the m-th row and n-th column, Am,nAnd
the amplitude and phase modulation coefficients of the electromagnetic microcells in the mth row and nth column, respectively, M is 1, 2.,N；
The digital baseband signal processing link maps the K paths of digital baseband signals into corresponding K paths of digital control signals, the K paths of digital control signals are converted into K paths of analog control signals through K digital-to-analog converters respectively, the K paths of analog control signals are loaded on K groups of electromagnetic micro units in the programmable super surface respectively, and the K groups of electromagnetic micro units in the programmable super surface generate corresponding K paths of modulation wave signals under the irradiation of a carrier wave generated by a radio frequency carrier signal source;
the acquisition process of the K paths of digital control signals comprises the following steps: firstly, according to the digital modulation mode adopted by the transmitter, the normalized amplitude and phase sequence of K paths of modulation wave signals corresponding to K paths of digital baseband signals are calculated, the normalized amplitude and phase sequence of the K paths of modulation wave signals are also the amplitude and phase modulation coefficient sequence of corresponding K groups of electromagnetic micro units, and then according to the characteristic that the amplitude and phase modulation coefficients of the electromagnetic micro units are regulated and controlled by control signals, the K paths of digital control signals corresponding to the amplitude and phase modulation coefficient sequence of the K groups of electromagnetic micro units are calculated.
2. The MIMO transmitter of claim 1, wherein the programmable super surface is a transmissive or reflective super surface, and the modulated wave signal is a transmitted wave or a reflected wave of the programmable super surface.
3. The MIMO transmitter based on programmable super surface according to claim 1, wherein the electromagnetic microcell is composed of a substrate, a microstructure disposed on the substrate, and a tunable element, wherein the microstructure is a metal microstructure or a semiconductor microstructure or a graphene microstructure or a compound microstructure, and the tunable element is a capacitor or an inductor or a resistor or a diode or a combination thereof.
4. The programmable super surface based MIMO transmitter of claim 1, wherein said rf carrier signal source is a single tone carrier signal source.
5. The MIMO transmitter of claim 1, wherein the carrier generated by the rf carrier signal source is amplified by power, transmitted by the feed antenna, and irradiated on the programmable super surface.
6. The programmable super-surface based MIMO transmitter of claim 5, wherein the carrier generated by said rf carrier signal source is vertically or obliquely incident on the super-surface.
7. The MIMO transmitter of claim 1, wherein the modulation scheme of the K-path modulated wave signal is a digital amplitude-phase modulation scheme of PSK or QAM.
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| CN113746515B (en) * | 2020-05-29 | 2023-06-06 | 华为技术有限公司 | Data transmission method, device and system applying electromagnetic super-surface array |
| CN111930053B (en) * | 2020-09-17 | 2022-05-20 | 中兴通讯股份有限公司 | Intelligent panel, control method of intelligent panel and communication system |
| CN112492512B (en) * | 2020-09-28 | 2021-11-30 | 北京大学 | Super-surface communication system, super-surface phase adjusting method and adjusting system |
| CN112838884B (en) * | 2021-01-04 | 2022-02-18 | 华中科技大学 | Method and system for calculating reflection coefficient of intelligent super surface |
| CN114843744B (en) * | 2021-02-02 | 2024-04-12 | 大唐移动通信设备有限公司 | Multi-antenna transmission method and device, base station main equipment and intelligent super-surface equipment |
| CN113204506B (en) * | 2021-04-09 | 2022-06-14 | 华中科技大学 | Intelligent super-surface control method, device and system based on time division multiplexing |
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