CN114024595B - Communication method and system for amphibious terminal - Google Patents
Communication method and system for amphibious terminal Download PDFInfo
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- H04B7/00—Radio transmission systems, i.e. using radiation field
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Abstract
The invention relates to a communication method and a communication system for an amphibious terminal, which are characterized in that a reconfigurable intelligent reflection surface RIS is adopted to realize two-way communication between relay equipment (a mother ship) and the amphibious terminal, so that various advantage performances of the reconfigurable intelligent reflection surface RIS are fully utilized, and convenience and accuracy of amphibious communication are improved. Further, the cable wire communication and RIS wireless communication (combining the power line carrier communication technology and the wireless radio frequency communication technology assisted by the reconfigurable intelligent reflecting surface) form a complete communication chain between amphibious terminals, and the advantages of the cable wire communication and RIS wireless communication are combined.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a wireless communication technology for an amphibious terminal.
Background
The ocean area of China is wide, and abundant oil gas, mineral products and biological resources are reserved. As the pace of understanding and developing the ocean by humans increases, the need for land-to-water communication is also increasing. For example, in marine science investigation activities, marine environment monitoring activities, marine resource investigation and development activities, fishery resource fishing activities, etc., there is an urgent need for a wireless, reliable and well-confidential two-way information transmission manner between an underwater terminal (S) (such as an underwater robot, an underwater sensor, etc.) and a surface mother ship, and between the underwater terminal (S) and a land terminal (D) to transmit information such as text, sound, image, control signals, etc.
Currently, main current amphibious communication comprises A underwater acoustic communication and B underwater optical wireless communication. Wherein A: the underwater acoustic channel is the most complex channel in the field of wireless communication, and is caused by scattering and refraction effects generated by wave fluctuation of the sea surface, layering unevenness and unevenness of the sea bottom and non-uniformity of a seawater medium when acoustic waves propagate in the sea. However, 1, its bandwidth resources are limited: in radio communication, the frequency range that can be used is 2 kHz-3000 GHz, and the highest frequency of sound waves (ultrasonic waves) can reach 5 GHz or higher, however, when the radio communication is applied to underwater acoustic communication, the available bandwidth is only on the order of tens of kHz, mainly because high-frequency sound waves are severely attenuated when propagating in sea water; 2. noise interference is severe: noise in the ocean, such as tides, ocean currents, sea surface waves, seismic activity, biological groups, transportation and shipping, and the like, will bring about serious propagation loss; 3. the performance is poor: the sound field in the sea is also randomly undulating due to random non-uniformities in the sea medium (e.g. temperature, quarter-throttle, tide) and this random undulating effect also affects the performance of the underwater acoustic communication. B: the underwater optical wireless communication is unstable, and the transmission performance and accuracy are seriously affected.
The existing amphibious communication scheme adopts underwater acoustic communication and satellite communication, and is specific in that: the underwater terminal (S) transmits information to the mother ship through underwater acoustic communication, and then transmits the information to the land terminal (D) through satellite communication. However, as described above, the underwater acoustic communication has many fatal disadvantages, in addition to the high cost of satellite communication and limited bidirectional communication function. Therefore, how to conveniently, quickly, accurately and low-cost achieve two-way communication between amphibious terminals is an important technical problem to be solved urgently at present, and further understanding and more effective development of oceans are concerned.
Disclosure of Invention
To solve the above technical problems, the present invention provides a communication method for an amphibious terminal, including:
s1: an underwater terminal S sends a data signal to a relay device T;
s2: the relay equipment T receives the data signal and sends the data signal to a reconfigurable intelligent reflecting surface;
s3: the reconfigurable intelligent reflecting surface is used for reflecting and adjusting the amplitude and the phase of the data signal, and transmitting the data signal after reflection adjustment to a land terminal D;
or (b)
S1': the land terminal D sends a data signal to the reconfigurable intelligent reflecting surface;
s2': the reconfigurable intelligent reflecting surface receives the data signals, reflects and adjusts the amplitude and the phase of the data signals, and sends the data signals after reflection adjustment to the relay equipment T;
s3': and the relay equipment T receives the data signal subjected to reflection adjustment and sends the data signal to the underwater terminal S.
Further, in the step S3, the reflection adjusts the amplitude and phase of the data signal, including:
s31: adjusting the amplitude of the data signal to reach the maximum amplitude;
s32: adjusting the phase of the data signal, and directionally transmitting the data signal to the land terminal D;
in step S2', the reflection adjusts the amplitude and phase of the data signal, comprising:
s21': adjusting the amplitude of the data signal to reach the maximum amplitude;
s22': and adjusting the phase of the data signal, and directionally transmitting the data signal to the relay device T.
Further, the step S31 includes:
s31a: according to the performance parameters of the reconfigurable intelligent reflection surface RIS, determining the fading channel from the relay equipment T to the reconfigurable intelligent reflection surface RIS as
；
S31b: according to the performance parameters of the reconfigurable intelligent reflection surface RIS, determining that the fading channel between the reconfigurable intelligent reflection surface RIS and the land terminal D is
；
S31c: the reflection coefficient of each reflection unit of the reconfigurable intelligent reflection surface RIS is controlled to satisfy the following conditions
So that the signal received by the land terminal D reaches the maximum amplitude;
the step S31' includes:
s21' a: according to the performance parameters of the reconfigurable intelligent reflection surface RIS, determining the fading channel from the land terminal D to the reconfigurable intelligent reflection surface RIS as
；
S21' b: according to the performance parameters of the reconfigurable intelligent reflection surface RIS, determining that a fading channel between the reconfigurable intelligent reflection surface RIS and the relay equipment T is
；
S21' c: the reflection coefficient of each reflection unit of the reconfigurable intelligent reflection surface RIS is controlled to satisfy the following conditions
Enabling the signal received by the relay equipment T to reach the maximum amplitude;
wherein,,
、/>
channel +.>
Amplitude and phase of>
、/>
Channel +.>
Amplitude and phase of>
The phase of the reflection coefficient of each reflection unit for the reconfigurable intelligent reflection surface.
Further, the step S32 includes:
s32a: sensing the position of the land terminal D;
s32b: analyzing the expected on-off state of each reflection unit of the reconfigurable intelligent reflection surface RIS according to the position of the land terminal D so as to directionally send the data signals to the land terminal D;
s32c: according to the expected on-off state, a control signal is sent out to control the on-off of each reflection unit of the reconfigurable intelligent reflection surface RIS;
the step S22' includes:
s22' a: sensing the position of the relay device T;
s22' b: analyzing the expected on-off state of each reflection unit of the reconfigurable intelligent reflection surface RIS according to the position of the relay device T so as to directionally send the data signals to the relay device T;
s22' c: and sending out a control signal according to the expected on-off state to control the on-off state of each reflection unit of the reconfigurable intelligent reflection surface RIS.
In another aspect, the present invention also provides a communication system for an amphibious terminal, comprising: the underwater terminal S, the relay equipment T, the reconfigurable intelligent reflection surface RIS and the land terminal D are sequentially connected;
the communication system for performing the communication method of any of claims 1-4.
Further, the communication system further includes: and the control device is connected with the reconfigurable intelligent reflection surface RIS and used for controlling the reconfigurable intelligent reflection surface RIS and reflecting and adjusting the amplitude and the phase of the data signal.
Further, the control device X includes: a receiving unit X100, a sensing unit X200, an analyzing unit X300, and a control unit X400;
the receiving unit X100 is connected with the analyzing unit X300, and is used for receiving the performance parameters of the reconfigurable intelligent reflecting surface RIS and sending the performance parameters to the analyzing unit X300;
the sensing unit X200 is connected to the analysis unit X300, and is configured to sense a real-time position of the land terminal D or the relay device T, and send the real-time position to the analysis unit X300;
the analysis unit X300 is connected to the control unit X400, and is configured to determine a phase of a reflection coefficient of each reflection unit of the reconfigurable intelligent reflection surface according to a performance parameter of the reconfigurable intelligent reflection surface RIS and a real-time position of the land terminal D or the relay device T
And the expected on-off state, and sent to the control unit X400;
the control unit X400 is connected with the reconfigurable intelligent reflecting surface RIS and is used for controlling the reflecting surface RIS according to the following conditions
And sending a control signal from the expected on-off state to control the reconfigurable intelligent reflection surface RIS.
Further, the relay device T is disposed on a ship.
Further, the reconfigurable intelligent reflection surface RIS is arranged on an air vehicle.
Further, a cable is used for connection between the underwater terminal S and the relay device T.
The invention provides a communication method and a communication system for an amphibious terminal, and the core of the communication method and the communication system is that a reconfigurable intelligent reflection surface RIS is adopted to realize two-way communication between relay equipment (a mother ship) and the amphibious terminal. The advantages are self-evident: 1. the reconfigurable intelligent reflection surface RIS has the performance parameters of size, dimension, quantity, interval and the like, can be designed according to actual requirements, is preferably arranged on an aerial vehicle (such as an unmanned aerial vehicle, an airplane and the like), is convenient to install and low in cost, is arranged on a wide and broad sky, can cover the ocean range in a full-scale manner, and has a wide application range; 2. the reconfigurable intelligent reflection surface RIS is auxiliary equipment in a wireless communication network, and when the reconfigurable intelligent reflection surface is deployed in the existing communication system, the communication protocol of the reconfigurable intelligent reflection surface RIS is matched without the change of standardization and hardware; the device is not affected by the noise of a receiver, devices such as analog-digital/digital-analog conversion, a power amplifier and the like are not needed when receiving signals, the introduction and amplification of noise are reduced, full duplex transmission can be provided, and the device can work at any frequency theoretically; the application range is wide, and the applicability is strong; 3. the reconfigurable intelligent reflection surface RIS is composed of passive elements/structures, each element only has a reflection function (the functions of amplitude modulation, phase shift and the like are carried out on input signals), power is hardly consumed, no energy is required in ideal cases, the requirements of energy conservation and consumption reduction are met, and the use cost is greatly reduced. Only an example of the advantages of this method is given here, without being limiting.
Drawings
Figures 1-2 are flowcharts of one embodiment of a communication method for an amphibious terminal of the invention;
figure 3 is a block diagram of one embodiment of a communications system for an amphibious terminal of the invention;
figures 4-5 are flowcharts of one embodiment of steps S3 and S2' of the communication method for an amphibious terminal of the invention;
figures 6-7 are flowcharts of one embodiment of steps S31 and S21' of the communication method for an amphibious terminal of the invention;
figures 8-9 are flowcharts of one embodiment of steps S32 and S22' of the communication method for an amphibious terminal of the invention;
FIG. 10 is a block diagram of one embodiment of a reconfigurable intelligent reflective surface RIS of the present invention;
FIG. 11 is a voltage control diagram of one embodiment of a reconfigurable intelligent reflective surface RIS of the present invention;
FIGS. 12-14 are phase diagrams of three embodiments of reconfigurable intelligent reflective surfaces of the present invention;
figure 15 is a graph comparing the effect of the communication method for an amphibious terminal of the invention with other methods;
figure 16 is a block diagram of one embodiment of a communication system for an amphibious terminal of the invention;
figure 17 is a block diagram of one embodiment of the control apparatus of the communication system for an amphibious terminal of the invention.
Detailed Description
As shown in fig. 1 and 2, the present invention provides a communication method for an amphibious terminal, comprising:
s1: an underwater terminal S sends a data signal to a relay device T;
s2: the relay device T receives the data signal and sends the data signal to the reconfigurable intelligent reflection surface RIS;
s3: the reconfigurable intelligent reflection surface RIS reflects and adjusts the amplitude and phase of the data signal, and sends the data signal after reflection adjustment to the land terminal D;
or (b)
S1': a land terminal D sends a data signal to the reconfigurable intelligent reflection surface RIS;
s2': the reconfigurable intelligent reflection surface RIS receives the data signals, reflects and adjusts the amplitude and the phase of the data signals, and sends the data signals after the reflection adjustment to the relay equipment T;
s3': and the relay equipment T receives the data signal after reflection adjustment and sends the data signal to the underwater terminal S.
In this embodiment, a specific implementation of two-way communication of an amphibious terminal is provided, and the core of the invention is to use a reconfigurable intelligent reflection surface RIS to realize two-way communication between a relay device (mother ship) and the amphibious terminal. In particular, the bi-directional communication data signals, optionally but not limited to, pictures, video, text, control signals, etc. Preferably, the underwater terminal optionally but not limited to feeds back text, sound, images, etc. to the land terminal (control center); the land terminals, optionally but not limited to, transmit control signals to the water terminals. In this embodiment, the advantage of using a reconfigurable intelligent reflective surface RIS is self-evident: 1. the reconfigurable intelligent reflection surface RIS has the performance parameters of size, dimension, quantity, interval and the like, can be designed according to actual requirements, is preferably arranged on an aerial vehicle (such as an unmanned aerial vehicle, an airplane and the like), is convenient to install and low in cost, is arranged on a wide and broad sky, can cover the ocean range in a full-scale manner, and has a wide application range; 2. the reconfigurable intelligent reflection surface RIS is auxiliary equipment in a wireless communication network, and when the reconfigurable intelligent reflection surface is deployed in the existing communication system, the communication protocol of the reconfigurable intelligent reflection surface RIS is matched without the change of standardization and hardware; the device is not affected by the noise of a receiver, devices such as analog-digital/digital-analog conversion, a power amplifier and the like are not needed when receiving signals, the introduction and amplification of noise are reduced, full duplex transmission can be provided, and the device can work at any frequency theoretically; the application range is wide, and the applicability is strong; 3. the reconfigurable intelligent reflection surface RIS is composed of passive elements/structures, each element only has a reflection function (the functions of amplitude modulation, phase shift and the like are carried out on input signals), power is hardly consumed, no energy is required in ideal cases, the requirements of energy conservation and consumption reduction are met, and the use cost is greatly reduced. Only an example of the advantages of this method is given here, without being limiting. Therefore, the implementation mode provides a convenient and quick communication mode with high accuracy and low cost for the two-way communication of the amphibious terminal, and provides effective guarantee for further understanding and developing marine resources.
Specifically, as shown in fig. 3, the underwater terminal S and the relay device T can selectively but not exclusively use effective communication of umbilical cables, and utilize the power line carrier communication technology, on one hand, the power line which is already erected can be fully utilized, a new communication line is not required to be introduced, so that the cost is low, and the method can be fully applied to environments such as submarine pipelines and mines which are unfavorable for laying new lines; on the other hand, the wired communication mode is not influenced by tide, noise, water temperature and the like under water, has strong stability, adopts the orthogonal frequency division multiplexing principle in the signal modulation and demodulation technology of the power carrier, is quite mature, and is widely applied to various electronic communication fields, and has high accuracy.
In the embodiment, the complete communication chain between the amphibious terminals is formed by cable wired communication and RIS wireless communication (combining a power line carrier communication technology and a wireless radio frequency communication technology assisted by a reconfigurable intelligent reflecting surface), and the advantages of the cable wired communication and RIS wireless communication are combined, so that the construction is simple, the cost is low, and the information interaction effect is good.
More specifically, as shown in fig. 3, in the case where the underwater terminal S transmits a data signal to the land terminal D, in the first communication slot (S-T): the underwater terminal S transmits the signal to the relay equipment T on the mother ship through the umbilical cable, and the received signal is set as
Wherein->
Representing average transmit power, +.>
Data signal representing the transmission of an underwater terminal over a PLC link, or +>
Representing gaussian white noise; in the second communication slot (T-RIS): the relay device T amplifies the received signal through a decoding and forwarding protocol, namely without executing any type of decoding, sets the amplification gain as G, and transmits the signal to a reconfigurable intelligent reflection surface RIS on the unmanned aerial vehicle through a wireless radio frequency link; in the third communication gap (RIS-D): after the phase of the signal is adjusted by the reconfigurable intelligent reflection surface RIS, the signal is directionally covered and finally transmitted to a land terminal D (control center receiver), and the received signal is +.>
，/>
Representing average transmit power, +.>
And->
Random variable for obeying Rayleigh distributionThe mean and variance are +.>
And->
，/>
Representing the data signal transmitted by the relay device T, +.>
Representing gaussian white noise.
More specifically, in step S3, the amplitude and phase of the reflection adjustment data signal, as shown in fig. 4, may optionally but not exclusively include:
s31: adjusting the amplitude of the data signal to reach a maximum amplitude;
s32: adjusting the phase of the data signal, and directionally transmitting the data signal to a land terminal D;
as shown in fig. 5, in step S2', the amplitude and phase of the reflection adjustment data signal may optionally, but not exclusively, include:
s21': adjusting the amplitude of the data signal to reach a maximum amplitude;
s22': the phase of the data signal is adjusted and directed to the relay device T.
In this embodiment, specific targets and requirements are given for adjusting the amplitude and phase of the data signal to bring its amplitude to its maximum amplitude that can be achieved to enhance its signal strength; the phase reaches a specific location where it is to be communicated to orient the device (land terminal D or relay device T) covering the desired signal. Finally, the propagation controllability of signals is realized, and the accuracy and precision of amphibious communication are improved.
More preferably, as shown in fig. 6, step S31, optionally but not limited to, includes:
s31a: according to the performance parameters of the reconfigurable intelligent reflection surface RIS, determining the fading channel from the relay equipment T to the reconfigurable intelligent reflection surface RIS as
；
S31b: according to the performance parameters of the reconfigurable intelligent reflection surface RIS, determining the fading channel between the reconfigurable intelligent reflection surface RIS and the land terminal D as
；
S31c: the reflection coefficient of each reflection unit of the reconfigurable intelligent reflection surface RIS is controlled to meet the following conditions
So that the signal received by the land terminal D reaches the maximum amplitude;
as shown in fig. 7, step S21' optionally but not limited to includes:
s21' a: according to the performance parameters of the reconfigurable intelligent reflection surface RIS, determining the fading channel between the land terminal D and the reconfigurable intelligent reflection surface RIS as
；
S21' b: according to the performance parameters of the reconfigurable intelligent reflection surface RIS, determining the fading channel between the reconfigurable intelligent reflection surface RIS and the relay equipment T as
；
S21' c: the reflection coefficient of each reflection unit of the reconfigurable intelligent reflection surface RIS is controlled to meet the following conditions
So that the signal received by the relay device T reaches the maximum amplitude;
wherein,,
、/>
channel +.>
Amplitude and phase of>
、/>
Channel +.>
Amplitude and phase of>
The phase of the reflection coefficient of each reflection unit for the reconfigurable intelligent reflection surface.
In this embodiment, a specific embodiment is given for adjusting the amplitude of the data signal to a maximum amplitude, and details are given of how the reconfigurable intelligent reflection surface RIS adjusts the amplitude. As shown in fig. 3, taking the example of the underwater terminal S transmitting a data signal to the terrestrial terminal D, it is assumed that the radio channel between T-RIS and RIS-D is subject to rayleigh fading
And
the fading channel between the T-RIS and the RIS-D is related to the number i of reflection units of the reconfigurable intelligent reflection surface RIS,
and->
Channel +.>
Amplitude and phase of>
And->
Channel +.>
Amplitude and phase of>
And->
For random variables obeying Rayleigh distribution, the mean and variance are +.>
And->
. The reconfigurable intelligent reflection surface RIS can accurately obtain the channel +.>
And->
Phase of->
、/>
Let the reflection coefficient of the ith reconfigurable unit be +>
The instantaneous signal-to-noise ratio of the signal after RIS reflection is thus optionally, but not exclusively, marked as: />
，/>
An average signal-to-noise ratio determined for the field environment, for which purpose the average signal-to-noise ratio is +.>
Under certain conditions, the FPGA controller controls the reflection panel unit of the reconfigurable intelligent reflection surface RIS to enable +.>
In this case, the maximum instantaneous signal-to-noise ratio is obtained, and the desired maximum received signal, i.e. maximum amplitude +.>
Thereby realizing the active control of electromagnetic waves.
More specifically, as shown in fig. 8, step S32, optionally but not limited to, includes:
s32a: sensing the position of the land terminal D;
s32b: analyzing the expected on-off state of each reflection unit of the reconfigurable intelligent reflection surface RIS according to the position of the land terminal D so as to directionally send the data signals to the land terminal D;
s32c: according to the expected on-off state, a control signal is sent out to control the on-off of each reflection unit of the reconfigurable intelligent reflection surface RIS;
as shown in fig. 9, step S22' optionally but not limited to includes:
s22' a: sensing the position of the relay device T;
s22' b: according to the position of the relay device T, analyzing the expected on-off state of each reflection unit of the reconfigurable intelligent reflection surface RIS so as to directionally send the data signals to the relay device T;
s22' c: and sending out a control signal according to the expected on-off state to control the on-off of each reflection unit of the reconfigurable intelligent reflection surface RIS.
In this embodiment, a specific embodiment of adjusting the phase of the data signal, directional coverage to the land terminal D or the relay device T is given, detailing how the reconfigurable intelligent reflection surface RIS adjusts the phase. More specifically, steps S32b, S32c; in S22'b and S22' c, the controller is optionally but not limited to a microprocessor such as an FPGA, a singlechip, etc., and is responsible for timing update of the reconfigurable intelligent reflection surface RIS and matched with the working state for controlling the on-off of the reconfigurable intelligent reflection surface RIS. More specifically, taking fig. 10 as an example, the reconfigurable intelligent reflective surface RIS may optionally include, but is not limited to, a three-layer architecture: 1. the outer layer medium substrate is printed with a large number of metal sheet elements attached to the outer layer medium substrate and directly interacted with an incident signal, and the FPGA controls the reverse bias voltage of the diode on each unit as shown in figure 11, so that the on-off of the reflecting surface unit is realized, and the phase direction change of different reflecting states of the signal beam can be realized under the condition that the reflecting surface unit is turned on and off differently; 2. the middle layer isolation layer is optionally but not limited to a copper plate, so that signal energy leakage is avoided; 3. the inner control layer, which is optionally but not limited to a control circuit board responsible for adjusting the reflection amplitude and phase of each element, is triggered by an intelligent controller such as an FPGA, a single-chip microcomputer, etc. attached to the reconfigurable intelligent reflection surface RIS. More specifically, the triggering state, i.e., the relationship of the expected on-off state of each reflective element of the intelligent reflective surface RIS to its phase, is optionally but not limited to that illustrated by tables 1-4 and FIGS. 12-14.
TABLE 1 reconfigurable Intelligent reflective surface RIS Panel initial State TABLE 1/0 State
When the panel unit states of 8×8 are all 1, as shown in table 2, the data signal propagates to the reconfigurable intelligent reflection surface RIS, and then is reflected by the reconfigurable intelligent reflection surface RIS, and then there is only one directional beam signal, as shown in fig. 12.
Table 2 reconfigurable Intelligent reflective RIS panel State 1 Table (all 1 State)
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
When the panel unit states of 8×8 are 0 and 1, as shown in table 3, the data signal propagates to the reconfigurable intelligent reflection surface RIS, and then is reflected by the reconfigurable intelligent reflection surface RIS, and then there are two beam signals in two directions, as shown in fig. 13.
TABLE 3 reconfigurable intelligent reflective surface RIS Panel State 2 Table (0/1 interval State)
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
When the panel unit states of 8×8 are 0, 1, 0, and 1 checkerboard, as shown in table 4, the data signal propagates to the reconfigurable intelligent reflection surface RIS, and then is reflected by the reconfigurable intelligent reflection surface RIS, and then there are four beam signals in four directions, as shown in fig. 14.
TABLE 4 reconfigurable intelligent reflective surface RIS panel State 3 Table (0/1 chessboard State)
| 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 |
| 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 |
| 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 |
| 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 |
| 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
To illustrate the effectiveness of the communication method of the present invention in detail, referring to fig. 15, the probability of interruption for a communication system with the reconfigurable intelligent reflective surface RIS assistance is lower than for a communication system without the RIS assistance, and the effect is more pronounced as the signal to noise ratio increases. Meanwhile, the larger the number N of the reflection units of the reconfigurable intelligent reflection surface RIS is, the more the number of the reflection surfaces is, the smaller the system interruption probability is, and the better the overall performance of the system is.
On the other hand, the present invention also provides, based on the above communication method, a communication system for executing the above communication method, as shown in fig. 3, including: the system comprises an underwater terminal S, a relay device T, a reconfigurable intelligent reflection surface RIS and a land terminal D which are connected in sequence. Specifically, the underwater terminal S is optionally, but not limited to, an underwater independent device such as an underwater robot, an underwater sensor, or a device carried by a diver, a submarine, or the like. The relay device, optionally but not limited to, is disposed on the ship, communicates bi-directionally with the mother ship, exchanging information data or control data. The reconfigurable intelligent reflective surface RIS is optionally but not exclusively arranged on an aerial vehicle, preferably an unmanned plane or an airplane or the like; the specific structure is optionally but not exclusively manufactured from artificial electromagnetic metamaterials, which consist of a periodic arrangement of specially designed sub-wavelength structural elements with unique electromagnetic properties not found in nature, such as negative refraction, complete absorption and extraordinary reflection/scattering. The geometry, such as square or split ring, size, orientation, arrangement, etc., can be arbitrarily set by one skilled in the art according to the actual needs to modify the response reflection amplitude and phase of their individual cell signals accordingly. The land terminal D, optionally but not limited to a terminal device of a control room, completes the reception and viewing of data, analysis processing, transmission of control data, etc. through a man-machine operation section. More specifically, communication connection is realized between the underwater terminal S and the relay device T by adopting a PLC link of an umbilical cable optionally but not exclusively; the relay device T is in communication connection with the reconfigurable intelligent reflection surface RIS and the reconfigurable intelligent reflection surface RIS is in communication connection with the land terminal D, optionally but not limited to, by using a radio frequency RF link.
It should be noted that, in the communication system of the present invention, corresponding to any of the above-mentioned communication methods, the combination and technical effects of the technical features are not limited to examples, and are not repeated herein. Specifically, parameters such as specific structures, sizes, distribution and number of reflection units, unit spacing and the like of the underwater terminal S, the relay device T, the reconfigurable intelligent reflection surface RIS and the land terminal D can be customized by those skilled in the art according to actual requirements.
More specifically, the reflection adjustment process of the reconfigurable intelligent reflecting surface can be manually adjusted in advance by a person skilled in the art according to the requirements of amplitude and phase, and then the reflection process is performed, or the reflection adjustment process is automatically adjusted by a controller such as an FPGA (field programmable gate array) and a singlechip. Preferably, the performance parameters, reflection coefficient, on-off state and the like of the reconfigurable intelligent reflecting surface can be updated and matched in real time according to the current position of the land terminal D or the relay device T which is sensed in real time.
Preferably, as shown in fig. 16, the communication system further includes: and the control device X is connected with the reconfigurable intelligent reflection surface RIS and used for controlling the reconfigurable intelligent reflection surface RIS and reflecting and adjusting the amplitude and the phase of the 5G electromagnetic wave signal.
More preferably, as shown in fig. 17, the control device X includes: a receiving unit X100, a sensing unit X200, an analyzing unit X300, and a control unit X400. The receiving unit X100 is connected with the analyzing unit X300, and is used for receiving the performance parameters of the reconfigurable intelligent reflection surface RIS and sending the performance parameters to the analyzing unit X300; the sensing unit X200 is connected with the analysis unit X300 and is used for sensing the position of the land terminal D or the relay equipment T and sending the position to the analysis unit X300; an analysis unit X300 connected with the control unit X400 for analyzing
And the expected on-off state of the reconfigurable intelligent reflection surface RIS is sent to the control unit X400; a control unit X400, connected to the reconfigurable intelligent reflection surface RIS, for controlling the reflection surface RIS according to +.>
And sending out a control signal from the expected on-off state to control the reconfigurable intelligent reflection surface RIS.
In this embodiment, a specific embodiment of the control device X is provided, which can determine the amplitude and phase of the reflected data signal according to the performance parameter of the reconfigurable intelligent reflecting surface and the real-time position of the device that needs to directionally send the data signal, so that the degree of automation is higher and the matching is stronger.
The above communication system is created based on the above communication method, and the combination, technical effect and beneficial effect of the technical features are not repeated herein, and each technical feature of the above embodiment may be arbitrarily combined, so that all possible combinations of each technical feature in the above embodiment are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description of the present specification.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. A communication method for an amphibious terminal, comprising:
s1: an underwater terminal (S) which transmits a data signal to the relay device (T);
s2: the relay device (T) receives the data signal and sends the data signal to a reconfigurable intelligent reflecting surface;
s3: the reconfigurable intelligent reflecting surface is used for reflecting and adjusting the amplitude and the phase of the data signal and transmitting the data signal after reflection adjustment to a land terminal (D);
or (b)
S1': the land terminal (D) sending data signals to the reconfigurable intelligent reflective surface;
s2': the reconfigurable intelligent reflecting surface receives the data signal, reflects and adjusts the amplitude and the phase of the data signal, and sends the data signal after reflection adjustment to the relay device (T);
s3': the relay device (T) receives the data signal after reflection adjustment and transmits the data signal to the underwater terminal (S);
in step S3, the reflection adjusts the amplitude and phase of the data signal, including:
s31: adjusting the amplitude of the data signal to reach the maximum amplitude;
s32: adjusting the phase of said data signal, directed to said terrestrial terminal (D);
in step S2', the reflection adjusts the amplitude and phase of the data signal, comprising:
s21': adjusting the amplitude of the data signal to reach the maximum amplitude;
s22': adjusting the phase of the data signal, directed to the relay device (T);
the step S31 includes:
s31a: determining a fading channel between the relay device (T) and the reconfigurable intelligent reflection surface (RIS) as
S31b: determining a fading channel between the reconfigurable intelligent reflection surface (RIS) and the land terminal (D) as
S31c: in controlling the reflection coefficient of each reflection unit of the reconfigurable intelligent reflection surface (RIS), the following is satisfied
-enabling the signal received by the terrestrial terminal (D) to reach a maximum amplitude;
the step S21' includes:
s21' a: determining a fading channel between said terrestrial terminal (D) and said reconfigurable intelligent reflective surface (RIS) as being based on performance parameters of said reconfigurable intelligent reflective surface (RIS)
S21' b: determining a fading channel between the reconfigurable intelligent reflection surface (RIS) and the relay device (T) as follows according to the performance parameters of the reconfigurable intelligent reflection surface (RIS)
S21' c: in controlling the reflection coefficient of each reflection unit of the reconfigurable intelligent reflection surface (RIS), the following is satisfied
-making the signal received by the relay device (T) reach a maximum amplitude;
wherein alpha is i 、θ i Respectively are channel h i Amplitude and phase of beta i 、
Respectively channel g i Amplitude and phase of phi i The phase of the reflection coefficient of each reflection unit for the reconfigurable intelligent reflection surface.
2. The communication method according to claim 1, wherein,
the step S32 includes:
s32a: sensing a location of the terrestrial terminal (D);
s32b: analyzing the expected on-off state of each reflection unit of the reconfigurable intelligent reflection surface (RIS) according to the position of the land terminal (D) to directionally transmit the data signal to the land terminal (D);
s32c: according to the expected on-off state, a control signal is sent out to control the on-off of each reflection unit of the reconfigurable intelligent reflection surface (RIS);
the step S22' includes:
s22' a: sensing a position of the relay device (T);
s22' b: analyzing the expected on-off state of each reflection unit of the reconfigurable intelligent reflection surface (RIS) according to the position of the relay device (T) to directionally transmit the data signal to the relay device (T);
s22' c: and sending out a control signal according to the expected on-off state, and controlling the on-off of each reflection unit of the reconfigurable intelligent reflection surface (RIS).
3. A communication system for an amphibious terminal, comprising: an underwater terminal (S), a relay device (T), a reconfigurable intelligent reflection surface (RIS) and a land terminal (D) which are connected in sequence;
the communication system for performing the communication method of any of claims 1-2.
4. A communication system according to claim 3, further comprising: and the control device is connected with the reconfigurable intelligent reflection surface (RIS) and is used for controlling the reconfigurable intelligent reflection surface (RIS) to reflect and adjust the amplitude and the phase of the data signal.
5. A communication system according to claim 4, characterized in that said control means (X) comprise: a receiving unit (X100), a sensing unit (X200), an analyzing unit (X300) and a control unit (X400);
the receiving unit (X100) is connected with the analyzing unit (X300) and is used for receiving the performance parameters of the reconfigurable intelligent reflection surface (RIS) and sending the performance parameters to the analyzing unit (X300);
the sensing unit (X200) is connected with the analysis unit (X300) and is used for sensing the real-time position of the land terminal (D) or the relay equipment (T) and sending the real-time position to the analysis unit (X300);
the analysis unit (X300) is connected to the control unit (X400) for determining the phase phi of the reflection coefficient of each reflection unit of the reconfigurable intelligent reflection surface (RIS) according to the performance parameters of the reconfigurable intelligent reflection surface and the real-time position of the land terminal (D) or the relay device (T) i And the expected on-off state, and sent to the control unit (X400);
the control unit (X400) is connected with the reconfigurable intelligent reflecting surface RIS and is used for controlling the intelligent reflecting surface RIS according to phi i And sending a control signal from the expected on-off state to control the reconfigurable intelligent reflection surface RIS.
6. A communication system according to any of claims 3-5, characterized in that the relay device (T) is arranged on a ship.
7. The communication system according to any of claims 4-5, wherein the reconfigurable intelligent reflective surface (RIS) is provided on an airborne aircraft.
8. A communication system according to any of the claims 3-5, characterized in that a cable connection is used between the submerged terminal (S) and the relay device (T).
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