CN113922927A - Wireless communication system and method based on coded aperture - Google Patents
Wireless communication system and method based on coded aperture Download PDFInfo
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- CN113922927A CN113922927A CN202110867197.9A CN202110867197A CN113922927A CN 113922927 A CN113922927 A CN 113922927A CN 202110867197 A CN202110867197 A CN 202110867197A CN 113922927 A CN113922927 A CN 113922927A
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- 238000004891 communication Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims abstract description 18
- 108091026890 Coding region Proteins 0.000 claims abstract description 4
- 230000005284 excitation Effects 0.000 claims description 6
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- 238000010586 diagram Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0059—Convolutional codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0067—Rate matching
- H04L1/0068—Rate matching by puncturing
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Abstract
The invention discloses a wireless communication system and a method based on a coded aperture, which comprises a transmitter, a receiver and a computer, wherein the transmitter comprises a signal processing substrate, an up-converter and the coded aperture, the receiver comprises a down-converter and a horn antenna, the computer and the signal processing substrate form two-way communication and transmit communication information and control instructions, the signal processing substrate is connected with the up-converter and the down-converter and used for receiving and transmitting intermediate frequency signals, and a signal processing board is connected with the coded aperture through a logic data line and used for directly programming and controlling the aperture. The coded aperture is composed of a large number of sub-wavelength digital coding units, and a specified far-field directional diagram can be generated by designing a digital coding sequence of the aperture in a space domain and a time domain, and the modulation of a communication signal is directly realized on the aperture. In addition, the system can realize information transmission in a single-channel mode and a multi-channel mode, and can realize transmission in different directions through beam steering of the coded aperture, thereby realizing independent communication with different users.
Description
Technical Field
The invention belongs to the field of wireless communication systems, and particularly relates to a wireless communication system and a wireless communication method based on a coded aperture.
Background
With the massive growth of datamation services in modern society, the communication spectrum becomes more and more crowded, forcing people to explore higher frequency bands and seek new technologies to achieve greater channel capacity and faster transmission rates. At present, the main measure for this problem is to use MIMO technology, i.e. multiple-input multiple-output technology, which can improve the capacity and spectrum utilization rate of the communication system by multiple times without increasing the bandwidth, and usually rely on the unit independence of the transmitting antenna array and the receiving array to generate multiple independent channels, so as to eliminate the signal correlation and improve the signal link performance. But the high complexity of the hardware thereof hinders the popularization of the practical application.
The invention aims to provide a multi-channel wireless communication system based on a coded aperture. The coded aperture can dynamically control the space and time-frequency domain response of electromagnetic waves, and when the coded aperture is used as a transmitting terminal and a receiving terminal of a communication system, the coded aperture can directly process information, so that the system architecture and the algorithm processing complexity of the traditional MIMO communication system can be greatly simplified. The method has wide application prospect in modern intelligent platforms such as 5G or 6G wireless communication and unmanned aerial vehicles or unmanned vehicles.
Disclosure of Invention
The invention aims to provide a multi-channel wireless communication system and method based on a coding aperture, and aims to solve the technical problems of high complexity, high cost and the like of the existing method for constructing an MIMO communication system.
In order to solve the technical problems, the specific technical scheme of the invention is as follows: a wireless communication system based on coded aperture comprises a transmitter, a receiver and a computer, wherein the transmitter comprises a signal processing substrate, an up-converter and a coded aperture; the computer and the signal processing substrate form two-way communication for transmitting communication information and control instructions, the signal processing substrate is connected with the up-converter and the down-converter and used for receiving and transmitting intermediate-frequency signals, the signal processing board is connected with the coding aperture through a logic data line and used for directly programming and controlling the aperture, the output end of the signal processing board is connected with the up-converter, and the output end of the up-converter is connected with the coding aperture.
Preferably, in the receiver, a standard horn antenna is placed 2.4m from the coded aperture for receiving the signal.
Preferably, the coded aperture is composed of a large number of sub-wavelength digital coding units, as shown in fig. 3, each small square represents a coded aperture unit, different colors represent different states of the units, different states of all the coded aperture units are combined to form codes of the coded aperture units, a specified far-field directional pattern can be generated by designing the digital coding sequence of the aperture in the space domain and the time domain, integrated signal modulation and beam control can be realized by designing the spatial distribution and the time switching sequence of the codes, each beam can independently transmit communication information, and multi-user independent communication is formed, thereby greatly simplifying the system architecture and the processing complexity of the algorithm of the conventional MIMO communication system. As shown in fig. 3a, a scanning communication mode, in which each beam represents one beam, and the beams can be scanned, so that directional communication in different directions can be realized, as shown in fig. 3b, and a multi-user communication mode, in which two beams represent two radiation beams, and each beam can independently transmit information, so that multi-user simultaneous communication is formed.
Far field of an oral surface according to the Huygens-Fresnel diffraction theorem
Can be controlled by the near field of mouth surface
Since the face field of the digitized coded aperture is digitally discrete, the face field can be noted as U (m Δ x, n Δ y, k Δ t), where m Δ x and n Δ y represent the coordinates of the cell on the face and k Δ t represents the time at which the face is coded. For simplicity, the orofacial field is further denoted as U (m, n, k) and its corresponding far field is denoted as U (m, n, k)
If the far field is specified in advance, the oral surface field can be transformed by Fourier transform of the far field
Is obtained in which
Representing Fourier transform, and dispersing the orofacial field to obtain the orofacial code corresponding to the far field. On the other hand, adding a modulation term to the expression for specifying the far field
Wherein, alpha represents the amplitude modulation,
representing phase modulation, the far field at that time corresponds to the face code
The far-field patterns corresponding to the two kinds of face-to-face codes are the same, but the amplitudes and phases of the far-field patterns are different, and if the two kinds of codes are switched according to a certain time sequence in time, the basis of signal modulation is formed. In summary, by designing the spatial distribution and the time switching sequence of the interface coding, the integrated beamforming and signal modulation can be realized.
Step 1: the computer controls the signal processing substrate to generate a baseband carrier signal and a single tone signal of 1.45 GHz;
step 2: the baseband carrier signal is converted into a 10GHz radio frequency signal through an up-converter to be used for exciting a coding aperture;
and step 3: calculating the face-to-face code of the coded aperture according to the target direction, writing the face-to-face code into the coded aperture, and generating a directional beam pointing to a target by the coded aperture under the excitation of a radio frequency excitation signal;
and 4, step 4: the data transmission is carried out by utilizing the aperture coding of the coded aperture, and on the premise of ensuring that the beam direction is not changed, the aperture coding is changed to control the phase of the beam, so that the phase modulation of the electromagnetic wave is realized, and finally the directional information transmission is realized.
And 5: after receiving the signal, the receiving end down-converts the signal from 10GHz to 1.45GHz through the down converter, then transmits the signal to the signal processing substrate for demodulation and decoding, and then transmits the signal to the computer to detect whether the signal is successfully transmitted and received.
Preferably, in the transmitter, the coded aperture enables simultaneous modulation of the communication signal and control of electromagnetic wave spatial radiation.
The wireless communication system and method based on the coded aperture have the following advantages that:
1. the assigned directional diagram is generated by utilizing the spatial coding of the coding aperture, and any assigned directional diagram can be formed based on a single channel.
2. The time domain coding of the coding aperture is utilized to realize the modulation of the signal, and the direct modulation of the signal on the aperture is realized.
3. The space-time joint coding of the coded aperture is utilized, the independent information transmission of a single-channel mode and a multi-channel mode can be realized, and the transmission in different directions can be realized through the beam steering of the coded aperture, so that the independent communication with different users is realized. Compared with the traditional MIMO communication system, the complexity of the system architecture and the algorithm is greatly reduced.
4. Realize information transmission in single channel mode and multi-channel mode, and realize transmission in different directions by beam steering of coded aperture, thereby realizing independent communication with different users
Drawings
FIG. 1 is a block diagram of a communication system of the present invention;
FIG. 2 is a flow chart of a communication method of the present invention;
figure 3 coded aperture schematic.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, a coded aperture based user tracking and wireless digital transmission method of the present invention will be described in further detail with reference to the accompanying drawings.
A wireless communication system based on coded aperture is characterized in that the system comprises a transmitter, a receiver and a computer, wherein the transmitter comprises a signal processing substrate, an up-converter and a coded aperture; the receiver includes a down-converter and a feedhorn. The computer and the signal processing substrate form two-way communication and transmit communication information and control instructions; the signal processing substrate is connected with the up-converter and the down-converter and used for receiving and transmitting intermediate frequency signals; the signal processing board is connected with the coding aperture through a logic data line and is used for directly programming and controlling the aperture. The coded aperture is composed of a large number of sub-wavelength digital coding units, and a specified far-field directional diagram can be generated by designing the digital coding sequence of the aperture in a space domain and a time domain, and the modulation of communication signals is directly realized on the aperture. The system can realize information transmission in a single-channel mode and a multi-channel mode, and can realize transmission in different directions through the beam steering of the coded aperture, thereby realizing independent communication with different users.
The method comprises the following specific implementation steps:
step 1: the computer controls the signal processing substrate to generate a baseband carrier signal and a single tone signal of 1.45 GHz;
step 2: the baseband carrier signal is converted into a 10GHz radio frequency signal through an up-converter to be used for exciting a coding aperture;
and step 3: calculating the face-to-face code of the coded aperture according to the target direction, writing the face-to-face code into the coded aperture, and generating a directional beam pointing to a target by the coded aperture under the excitation of a radio frequency excitation signal;
and 4, step 4: the data transmission is carried out by utilizing the aperture coding of the coded aperture, and on the premise of ensuring that the beam direction is not changed, the aperture coding is changed to control the phase of the beam, so that the phase modulation of the electromagnetic wave is realized, and finally the directional information transmission is realized.
And 5: after receiving the signal, the receiving end down-converts the signal from 10GHz to 1.45GHz through the down converter, then transmits the signal to the signal processing substrate for demodulation and decoding, and then transmits the signal to the computer to detect whether the signal is successfully transmitted and received.
In the present embodiment, in the transmitter, the coded aperture enables simultaneous modulation of communication signals and control of electromagnetic wave spatial radiation.
To verify that the main lobe of the coded aperture is steerable for single channel wireless communication, we conducted wireless communication experiments in two directions, with photographs taken by pointing (θ 1-0 °,
) The main lobe of (a) is launched and restored, the main lobe is steered (θ 1-10 °,
) It shows that the coded aperture can produce a steerable channel with good performance in wireless transmission.
To verify the effectiveness and robustness of multi-channel mode wireless communication, the experimental photograph was oriented (θ 1-10 °,
) The direction was transmitted, and the experimental photograph was directed (θ 2-30 °,
) Directional transmission, the receiver placed in the illuminated area of the two main lobes to receive the picture, and initially the transmitter placed at (θ 1 ═ 10,
) The orientation was taken and the experimental picture was received, then the transmitter was placed at (theta 2-30 deg.,
) The direction and the received experimental photo, when the receiver is placed at the right position, the recorded CRC value is 0, which shows that the frame error rate of the wireless communication system based on the coding aperture is 0 on all channels, the experimental photo is coded in frames at the MAC layer, each frame is 5844 bits long, secondly, a 24-bit cyclic redundancy check code is added in each frame, therefore, the receiver can judge whether the received signal is right by performing CRC check, the smaller the CRC value is, the wrong the received signal isThe smaller the rate, the completely correct reception indicates a CRC value of 0. First, a frame is encoded using LDPC coding, and a pilot sequence of 1956 bits is added to the frame, so that a decoder of a receiver can synchronize a received frame by convolving the pilot sequence. The entire frame is then broken down into 4 sub-frames, which are loaded onto a digital circuit board and mapped onto a digital code of the coded aperture, the switching frequency of which is 10MHz, i.e. the system transmission rate is 10 mbits/sec.
While the invention has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (5)
1. A wireless communication system based on a coded aperture is characterized by comprising a transmitter, a receiver and a computer, wherein the transmitter comprises a signal processing substrate, an up-converter and a coded aperture, the receiver comprises a down-converter and a horn antenna, and the horn antenna is connected with the down-converter; the computer forms two-way communication with the signal processing substrate for transmitting communication information and control instructions, the signal processing substrate is connected with the up-converter and the down-converter and used for receiving and transmitting intermediate-frequency signals, the signal processing board is connected with the coding aperture through a logic data line and used for directly carrying out programming control on the aperture, the output end of the signal processing board is also connected with the up-converter, and the output end of the up-converter is connected with the coding aperture.
2. A coded aperture based wireless communication system according to claim 1, wherein the standard horn antenna is placed 2.4m from the coded aperture in the receiver for receiving signals.
3. A coded aperture based wireless communication system according to claim 1, wherein the coded aperture is formed by a plurality of sub-wavelength digital coding units, and the digital coding sequence of the aperture is designed in space and time domains to generate a specified far-field pattern and to directly modulate the communication signal on the aperture.
4. A wireless communication method based on coded aperture is characterized by comprising the following steps:
step 1: the computer controls the signal processing substrate to generate a baseband carrier signal and a single tone signal of 1.45 GHz;
step 2: the baseband carrier signal is converted into a 10GHz radio frequency signal through an up-converter to be used for exciting a coding aperture;
and step 3: calculating the face-to-face code of the coded aperture according to the target direction, writing the face-to-face code into the coded aperture, and generating a directional beam pointing to a target by the coded aperture under the excitation of a radio frequency excitation signal;
and 4, step 4: the method comprises the steps that data transmission is carried out by utilizing the aperture face code of the coded aperture, on the premise that the direction of a directional beam is not changed, the aperture face code is changed to control the phase of the directional beam, the phase modulation of electromagnetic waves is realized, and finally directional information transmission is realized;
and 5: after receiving the signal, the receiving end down-converts the signal from 10GHz to 1.45GHz through the down converter, then transmits the signal to the signal processing substrate for demodulation and decoding, and then transmits the signal to the computer to detect whether the signal is successfully transmitted and received.
5. A coded aperture based wireless communication method according to claim 4, characterized in that in the transmitter the coded aperture enables simultaneous modulation of communication signals and control of electromagnetic wave spatial radiation.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101842714A (en) * | 2007-09-23 | 2010-09-22 | 光束网络有限公司 | Communication system and method using an active phased array antenna |
| CN104011558A (en) * | 2011-12-28 | 2014-08-27 | Hrl实验室有限责任公司 | Coded aperture beam analysis method and apparatus |
| CN104020462A (en) * | 2014-05-15 | 2014-09-03 | 北京化工大学 | Synthetic aperture wave beam synthesizer based on FPGA |
| US20150010098A1 (en) * | 2011-10-07 | 2015-01-08 | Thomas J. Kenney | Methods and arrangements for communications in low power wireless networks |
| CN109819425A (en) * | 2019-01-31 | 2019-05-28 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | V-band high-speed digital transmission near field communication system |
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- 2021-07-29 CN CN202110867197.9A patent/CN113922927A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101842714A (en) * | 2007-09-23 | 2010-09-22 | 光束网络有限公司 | Communication system and method using an active phased array antenna |
| US20150010098A1 (en) * | 2011-10-07 | 2015-01-08 | Thomas J. Kenney | Methods and arrangements for communications in low power wireless networks |
| CN104011558A (en) * | 2011-12-28 | 2014-08-27 | Hrl实验室有限责任公司 | Coded aperture beam analysis method and apparatus |
| CN104020462A (en) * | 2014-05-15 | 2014-09-03 | 北京化工大学 | Synthetic aperture wave beam synthesizer based on FPGA |
| CN109819425A (en) * | 2019-01-31 | 2019-05-28 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | V-band high-speed digital transmission near field communication system |
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