CN114726418A - Wireless communication method, device and equipment based on IRS (inter-Carrier) assisted AF (automatic frequency hopping) relay - Google Patents

Wireless communication method, device and equipment based on IRS (inter-Carrier) assisted AF (automatic frequency hopping) relay Download PDF

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CN114726418A
CN114726418A CN202210232196.1A CN202210232196A CN114726418A CN 114726418 A CN114726418 A CN 114726418A CN 202210232196 A CN202210232196 A CN 202210232196A CN 114726418 A CN114726418 A CN 114726418A
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channel parameter
relay
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receiving end
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CN114726418B (en
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李学易
李志忠
王永华
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Guangdong University of Technology
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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
    • H04B7/0426—Power distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/145—Passive relay systems
    • 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
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    • 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
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    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention relates to the technical field of wireless communication, in particular to a wireless communication method, a device and equipment based on an IRS (intelligent radio service) assisted AF (automatic frequency control) relay. The wireless communication method controls the operation of the transmitting terminal, the AF relay, the IRS and the receiving terminal by optimizing the configurable parameters of the wireless communication system and by optimizing the transmitting power of the transmitting terminal, the AF relay transmitting power and the N reflection coefficients of the transmission period before and after the IRS, thereby enhancing the communication transmission efficiency and the channel capacity between the transmitting terminal and the receiving terminal and enhancing the robustness of the wireless communication.

Description

Wireless communication method, device and equipment based on IRS (inter-Carrier) assisted AF (automatic frequency hopping) relay
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a wireless communication method, apparatus, and device based on an IRS assisted AF relay.
Background
The wireless cooperative relay communication technology is that one or more relay devices are deployed between a transmitting end and a receiving end, a wireless signal from the transmitting end is amplified in a certain mode and then transmitted to the receiving end, and the purpose of expanding the coverage area of the wireless signal or enhancing the communication reliability is achieved.
The most common relay strategies of the existing relay are Decode-and-Forward (DF) and Amplify-and-Forward (AF), DF relay devices are more complex, have high technical difficulty and higher cost, and AF relay is relatively simple to implement, has low technical complexity and low economic cost, so that AF relay is widely applied in practical application. With the emergence of new communication technologies and the progress of artificial electromagnetic materials, an Intelligent Reflecting Surface (IRS) enters the visual field of people, the IRS is composed of a plurality of independent passive Reflecting units, each unit can actively control phase shift parameters and amplitude parameters of electromagnetic wave reflection coefficients, superposition or subtraction between signals of different paths can be realized at a specific position, and the purposes of enhancing signal intensity or inhibiting same-frequency interference are achieved. The IRS has low energy consumption and high efficiency, and is considered as one of the key technologies of the next generation wireless communication.
The existing DF relay communication system and the IRS auxiliary communication system respectively have the advantages and the disadvantages, and when the IRS reflection unit reaches hundreds of, the communication performance can surpass the single DF relay system. In order to make up the respective deficiencies of the IRS and the relay, the advantages of the IRS and the relay are harvested, and the relay and the IRS are mutually cooperated and fused. Therefore, a communication system using IRS for assisting half-duplex/full-duplex DF relaying has emerged, and the DF relaying system with the IRS assistance can actually improve the system performance effectively.
The AF relay is relatively simple to realize, low in technical complexity and economic cost, and has been widely applied to practical application. The existing AF relay communication system consists of a transmitting end, an AF relay and a receiving end, and the IRS auxiliary communication system consists of a transmitting end, an IRS and a receiving end.
Disclosure of Invention
The embodiment of the invention provides a wireless communication method, a device and equipment based on an IRS (inter-Carrier relay) assisted AF (automatic frequency hopping) relay, which are used for solving the technical problems that the IRS and the AF relay are independently used in a wireless cooperative communication system at present and the IRS and the AF relay are not combined and applied to the wireless communication system.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a wireless communication method based on IRS assisted AF relay is applied to a wireless communication system, the wireless communication system comprises a transmitting end, an intelligent reflecting surface, AF relay and a receiving end, the intelligent reflecting surface comprises N transmitting units, and the wireless communication method comprises the following steps:
acquiring a first channel parameter, a second channel parameter and a third channel parameter transmitted by the transmitting end to the intelligent reflecting surface, the AF relay and the receiving end, and acquiring a fourth channel parameter transmitted by the intelligent reflecting surface to the receiving end, a fifth channel parameter transmitted by the AF relay to the receiving end, reflection coefficients of N reflecting units, a first noise parameter of the AF relay and a second noise parameter of the receiving end;
performing enhancement optimization processing on the first channel parameter, the second channel parameter, the third channel parameter, the fourth channel parameter, the fifth channel parameter and the N reflection coefficients to obtain optimized sending power of the transmitting end, optimized transmitting power of the AF relay, N front half transmission period reflection coefficients and N rear half transmission period reflection coefficients of the intelligent reflecting surface;
in a first half transmission period, controlling the transmitting end and the intelligent reflecting surface to operate through the transmitting power and N first half transmission period reflection coefficients to obtain a first receiving signal of the receiving end and a transmitting signal of the intelligent reflecting surface;
in the second half transmission period, the AF relay and the intelligent reflecting surface are controlled to operate through the sending power, the transmitting signal and N second half transmission period reflection coefficients, and an amplified signal output by the AF relay and a second receiving signal of the receiving end are obtained.
Preferably, the wireless communication method based on IRS-assisted AF relay includes:
calculating the third channel parameter, the fourth channel parameter, the first channel parameter, the sending power and the second noise parameter by adopting a first received signal formula to obtain a first received signal of the receiving end in the first half transmission period;
calculating the fifth channel parameter, the fourth channel parameter, the second channel parameter, the sending power, the first noise parameter and the second noise parameter by adopting a second received signal formula to obtain a second received signal of the receiving end in a second half transmission period;
and carrying out maximum ratio combining processing on the first receiving signal and the second receiving signal to obtain a receiving signal of the receiving end.
Preferably, the first received signal formula is:
Figure BDA0003538871730000031
in the formula, yd1Is the first received signal of the first half transmission period of the receiving end, hsdIs a third channel parameter, hid TFor the fourth channel parameter hidTranspose of (h), hsiIs a first channel parameter, psFor the transmit power of the transmitting end, s is the transmit signal with mean square value of 1, zdA second noise parameter of the receiving end;
the second received signal formula is:
Figure BDA0003538871730000032
Figure BDA0003538871730000033
in the formula, yd2A second received signal of a second half transmission period of the receiving end, hrdIs a fifth channel parameter, hid TFor the fourth channel parameter hidTranspose of hsiIs a first channel parameter, hir TOutputting an amplified signal h for AF relayingirTranspose of (p)sBeing the transmitting endTransmission power, s is a transmission signal having a mean square value of 1, zdIs a second noise parameter, z 'of the receiving end'rFirst noise parameter, p, relayed for AFrTransmit power, h, for AF relayingsrAs the second channel parameter, the channel parameter,
Figure BDA0003538871730000034
variance of first noise parameter Gaussian distribution for AF relay, diagonal matrix
Figure BDA0003538871730000035
Is a matrix of N first half transmission period reflection coefficients, ηn∈[0,1]，θnE [0,2 π), diagonal matrix
Figure BDA0003538871730000036
Is a matrix of N second half transmission periods of reflection coefficient, pn∈[0,1]，φnIs belonged to [0,2 pi), N is belonged to N, and N is a natural number larger than 1.
Preferably, the wireless communication method based on IRS-assisted AF relay includes: calculating the first channel parameter, the second channel parameter, the third channel parameter, the fourth channel parameter, and the fifth channel parameter by using a reflection coefficient optimization formula to obtain N first half transmission period reflection coefficients and N second half transmission period reflection coefficients of the optimized intelligent reflecting surface, where the reflection coefficient optimization formula is:
Figure BDA0003538871730000037
Figure BDA0003538871730000038
in the formula (I), the compound is shown in the specification,
Figure BDA0003538871730000039
to optimize the first half transmission cycle reflection coefficient of the last nth reflection unit,
Figure BDA00035388717300000310
in order to optimize the reflection coefficient of the second half transmission period of the nth reflection unitsrIs a second channel parameter, hsiIs a first channel parameter, hirAmplified signal output for AF relay, hrdIs a fifth channel parameter, hidAnd N belongs to N as a fourth channel parameter, wherein N is a natural number greater than 1.
Preferably, the wireless communication method based on IRS-assisted AF relay includes: calculating the first channel parameter, the second channel parameter, the third channel parameter, the fourth channel parameter, the fifth channel parameter, and the N reflection coefficients by using a power optimization distribution formula to obtain the optimized transmission power of the transmitting terminal and the transmission power of the AF relay, where the power optimization distribution formula is:
Figure BDA0003538871730000041
Figure BDA0003538871730000042
Figure BDA0003538871730000043
Figure BDA0003538871730000044
in the formula, psFor the transmit power of the transmitting end, prTransmit power, h, for AF relayingsdIs a third channel parameter, hid TFor the fourth channel parameter hidTranspose of hsiIs a first channel parameter, hsrAs the second channel parameter, the channel parameter,
Figure BDA0003538871730000045
first noise parameter for AF relayingThe variance of the gaussian distribution is such that,
Figure BDA0003538871730000046
is the variance, h, of the Gaussian distribution of the second noise parameter at the receiving endrdIs a fifth channel parameter, hir TOutputting an amplified signal h for AF relayingirP is the total power of the transmitting end and the AF relay, Pr+ps≤P。
The invention also provides a wireless communication device based on the IRS-assisted AF relay, which is applied to a wireless communication system, wherein the wireless communication system comprises a transmitting end, an intelligent reflecting surface, the AF relay and a receiving end, the intelligent reflecting surface comprises N transmitting units, and the wireless communication device comprises: the system comprises a data acquisition module, a central calculation module connected with the data acquisition module and a control module connected with the central calculation module;
the data acquisition module is used for acquiring parameter data of the wireless communication system;
the central calculation module is used for calculating according to the parameter data to obtain the sending power of the transmitting end, the transmitting power of the AF relay, N first half transmission period reflection coefficients and N second half transmission period reflection coefficients of the intelligent reflecting surface;
the control module is used for controlling the operation of the transmitting terminal, the intelligent reflecting surface, the AF relay and the receiving terminal according to the wireless communication method based on the IRS-assisted AF relay;
the parameter data includes a first channel parameter, a second channel parameter, a third channel parameter, a fourth channel parameter transmitted by the intelligent reflector to the receiving end, a fifth channel parameter transmitted by the AF relay to the receiving end, reflection coefficients of N reflection units, a first noise parameter of the AF relay, and a second noise parameter of the receiving end, which are transmitted by the transmitting end to the intelligent reflector, the AF relay, and the receiving end.
Preferably, the central calculation module is configured to calculate by using a reflection coefficient optimization formula and a power optimization distribution formula, to obtain the transmission power of the transmitting end, the transmission power of the AF relay, and the reflection coefficients of N first half transmission periods and N second half transmission periods of the intelligent reflecting surface.
Preferably, the power optimization allocation formula is:
Figure BDA0003538871730000051
Figure BDA0003538871730000052
Figure BDA0003538871730000053
Figure BDA0003538871730000054
in the formula, psFor the transmit power of the transmitting end, prTransmit power, h, for AF relayingsdIs a third channel parameter, hid TFor the fourth channel parameter hidTranspose of hsiIs a first channel parameter, hsrAs the second channel parameter, the channel parameter,
Figure BDA0003538871730000055
the variance of the gaussian distribution of the first noise parameter relayed for AF,
Figure BDA0003538871730000056
is the variance, h, of the Gaussian distribution of the second noise parameter at the receiving endrdIs a fifth channel parameter, hir TOutputting an amplified signal h for AF relayingirP is the total power of the transmitting end and the AF relay, Pr+ps≤P；
The reflection coefficient optimization formula is as follows:
Figure BDA0003538871730000057
Figure BDA0003538871730000061
in the formula (I), the compound is shown in the specification,
Figure BDA0003538871730000062
to optimize the first half transmission cycle reflection coefficient of the last nth reflection unit,
Figure BDA0003538871730000063
in order to optimize the reflection coefficient of the second half transmission period of the nth reflection unitsrIs a second channel parameter, hsiIs a first channel parameter, hirAmplified signal output for AF relay, hrdIs a fifth channel parameter, hidAnd N belongs to N as a fourth channel parameter, wherein N is a natural number greater than 1.
Preferably, the control module is further configured to control operations of the transmitting end, the intelligent reflecting surface, the AF relay, and the receiving end according to the wireless communication method based on the IRS-assisted AF relay after receiving the transmitting power, the N first half transmission cycle reflection coefficients, and the N second half transmission cycle reflection coefficients transmitted by the central computing module, so that the transmitting end performs data transmission to the receiving end.
The invention also provides wireless communication equipment based on the IRS assisted AF relay, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the above-mentioned wireless communication method based on IRS-assisted AF relay according to instructions in the program code.
According to the technical scheme, the embodiment of the invention has the following advantages: the wireless communication method, device and equipment based on the IRS assisted AF relay comprise the following steps: acquiring a first channel parameter, a second channel parameter and a third channel parameter transmitted by a transmitting end to an intelligent reflecting surface, an AF relay and a receiving end, and acquiring a fourth channel parameter transmitted by the intelligent reflecting surface to the receiving end, a fifth channel parameter transmitted by the AF relay to the receiving end, reflection coefficients of N reflecting units, a first noise parameter of the AF relay and a second noise parameter of the receiving end; performing enhancement optimization processing on the first channel parameter, the second channel parameter, the third channel parameter, the fourth channel parameter, the fifth channel parameter and the N reflection coefficients to obtain the sending power of an optimized transmitting end, the transmitting power of an AF relay, N front half transmission period reflection coefficients and N rear half transmission period reflection coefficients of an intelligent reflecting surface; in the first half transmission period, controlling the transmitting end and the intelligent reflecting surface to operate through the transmitting power and the reflection coefficients of N first half transmission periods to obtain a first receiving signal of the receiving end and a transmitting signal of the intelligent reflecting surface; and in the second half transmission period, the AF relay and the intelligent reflecting surface are controlled to operate by the sending power, the sending signal and the reflection coefficients of the N second half transmission periods, so that an amplified signal output by the AF relay and a second receiving signal of a receiving end are obtained. By the wireless communication method based on the IRS-assisted AF relay, the intelligent reflecting surface and the AF relay can be combined to be used for data transmission of a wireless communication system, so that the method has the advantages of intelligent reflecting surface and AF relay data transmission, and the technical problem that the IRS and the AF relay are used for a wireless cooperative communication system independently and are not combined to be applied to the wireless communication system at present is solved. The wireless communication method controls the operation of the transmitting end, the AF relay, the intelligent reflecting surface and the receiving end by optimizing the configurable parameters of the wireless communication system and by optimizing the transmitting power of the transmitting end, the transmitting power of the AF relay, the N first half transmission period reflection coefficients and the N second half transmission period reflection coefficients of the intelligent reflecting surface, so that the communication transmission efficiency and the channel capacity between the transmitting end and the receiving end can be enhanced, and the robustness of the wireless communication is enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating steps of a wireless communication method based on IRS-assisted AF relay according to an embodiment of the present invention;
fig. 2 is a block diagram of a wireless communication system according to an embodiment of the present invention, which is a wireless communication method based on IRS assisted AF relay;
fig. 3a is a frame diagram of the first half of a data transmission period of a wireless communication method based on IRS assisted AF relay according to an embodiment of the present invention;
fig. 3b is a frame diagram of a second half data transmission period of the wireless communication method based on IRS assisted AF relay according to the embodiment of the present invention;
fig. 4 is a block diagram of a wireless communication device based on IRS-assisted AF relay according to an embodiment of the present invention;
fig. 5 is a schematic coordinate diagram of a wireless communication system in a wireless communication apparatus based on IRS assisted AF relay according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a variation of an average channel capacity of a wireless communication system with a transmission snr in a wireless communication apparatus based on IRS assisted AF relay according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a variation of an average channel capacity of a wireless communication system with the number of IRS reflection units in a wireless communication apparatus based on IRS assisted AF relay according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The embodiment of the application provides a wireless communication method, a device and equipment based on IRS-assisted AF relay, which are applied to a wireless communication system and used for solving the technical problems that the IRS and the AF relay are independently used for a wireless cooperative communication system at present and the IRS and the AF relay are not combined and applied to the wireless communication system.
The first embodiment is as follows:
fig. 1 is a flowchart illustrating steps of a wireless communication method based on IRS-assisted AF relay according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a wireless communication method based on IRS assisted AF relay, which is applied to a wireless communication system, where the wireless communication system includes a transmitting end, an intelligent reflective surface, an AF relay, and a receiving end, the intelligent reflective surface includes N transmitting units, and the wireless communication method includes the following steps:
s1, acquiring a first channel parameter, a second channel parameter and a third channel parameter transmitted by a transmitting end to an intelligent reflecting surface, an AF relay and a receiving end, and acquiring a fourth channel parameter transmitted by the intelligent reflecting surface to the receiving end, a fifth channel parameter transmitted by the AF relay to the receiving end, reflection coefficients of N reflecting units, a first noise parameter of the AF relay and a second noise parameter of the receiving end.
It should be noted that, the method mainly obtains channel parameters (also referred to as CSI) and noise parameters of each channel on the wireless communication system and reflection coefficients of each reflection unit of the intelligent reflection surface, and provides enhanced optimization data for data transmission of the wireless communication system.
Fig. 2 is a block diagram of a wireless communication system of a wireless communication method based on IRS assisted AF relay according to an embodiment of the present invention.
In the embodiment of the present invention, as shown in fig. 2, the wireless communication system mainly comprises a transmitting end 10, an intelligent reflecting surface 20, an AF relay 30, and a receiving end 40. The intelligent reflective surface 20 is abbreviated IRS.
It should be noted that, the distance between the transmitting end and the receiving end is too far, the wireless channel between the transmitting end and the receiving end is relatively weak, and the wireless link between the nodes is as shown in fig. 2. The intelligent reflective surface IRS20 includes N reflective units, and the reflection coefficient (including amplitude and phase shift) of each reflective unit can be adjusted.
And S2, performing enhancement optimization processing on the first channel parameter, the second channel parameter, the third channel parameter, the fourth channel parameter, the fifth channel parameter and the N reflection coefficients to obtain the sending power of the optimized transmitting end, the transmitting power of the AF relay, the N first half transmission period reflection coefficients and the N second half transmission period reflection coefficients of the intelligent reflecting surface.
It should be noted that, the data obtained in step S1 are mainly enhanced and optimized to obtain the optimized transmission power of the transmitting end, the optimized transmission power of the AF relay, and the reflection coefficients of N first half transmission cycles and N second half transmission cycles of the intelligent reflective surface, so as to provide control parameters for the subsequent steps S3 and S4 in the data transmission process, thereby achieving the purpose of enhancing the signal-to-noise ratio or capacity of the received signal at the receiving end.
Fig. 3a is a block diagram of a first half data transmission period of a wireless communication method based on IRS-assisted AF relay according to an embodiment of the present invention, and fig. 3b is a block diagram of a second half data transmission period of the wireless communication method based on IRS-assisted AF relay according to an embodiment of the present invention.
And S3, in the first half transmission period, controlling the transmitting end and the intelligent reflecting surface to operate through the transmitting power and the reflection coefficients of N first half transmission periods to obtain a first receiving signal of the receiving end and a transmitting signal of the intelligent reflecting surface.
It should be noted that, as shown in fig. 3a, the sending power of the output signal of the sending end is mainly controlled according to the data obtained in step S2, and the reflection coefficient of N first half transmission periods is used to control the intelligent reflection surface to send the sending signal to the AF relay, and the receiving end receives the first receiving signal of the first half transmission period.
And S4, in the latter half transmission period, controlling the AF relay and the intelligent reflecting surface to operate through the sending power, the sending signal and the reflection coefficients of N latter half transmission periods to obtain an amplified signal output by the AF relay and a second receiving signal of a receiving end.
It should be noted that, as shown in fig. 3b, the transmitting power of the AF relay output signal is mainly controlled according to the data obtained in step S2, and the reflection coefficient of N second half transmission periods is used to control the intelligent reflection surface to send a signal to the receiving end, and the receiving end receives the second received signal of the second half transmission period.
In the embodiment of the invention, a complete data transmission period is divided into two equal half periods, the AF relay adopts a half-duplex relay mode, in the first half transmission period, the transmitting end sends a signal outwards with the transmitting power obtained in the step S2, meanwhile, the IRS also reflects the incident signal out through the signal regulated and controlled by the reflection coefficients of N first half transmission periods, and the AF relay receives the signal h reflected by the transmitting end and the IRSir'; in the second half of transmission period, the AF relay amplifies the signal received in the first half of transmission period to obtain an amplified signal hirAnd then sending the amplified signal to the outside by using the transmitting power, similarly, the IRS also reflects the incident amplified signal from the AF relay out by using a signal regulated and controlled by a reflection coefficient of N second half transmission periods, and the receiving end receives the signals reflected by the AF relay and the IRS. And in the latter half period, the transmitting end is muted and does not transmit signals.
It should be noted that, as shown in fig. 3a and 3b, in the wireless communication system,
Figure BDA0003538871730000101
and
Figure BDA0003538871730000102
respectively representing channel parameters between a transmitting terminal and an AF relay and between the AF relay and a receiving terminal, wherein
Figure BDA0003538871730000103
Representing complex numbers, vectors
Figure BDA0003538871730000104
Respectively representing channel parameters between a transmitting end and N reflection units of the IRS, between an AF relay and the N reflection units of the IRS, and between the N reflection units of the IRS and a receiving end, wherein
Figure BDA0003538871730000105
Representing a complex phasor. Vector hsi、hirAnd hidMay be represented as: [ h ] ofsi]n、[hir]nAnd [ h ]id]n。
The invention provides a wireless communication method based on an IRS (intelligent resilient station) assisted AF (automatic frequency hopping) relay, which comprises the following steps: acquiring a first channel parameter, a second channel parameter and a third channel parameter transmitted by a transmitting end to an intelligent reflecting surface, an AF relay and a receiving end, and acquiring a fourth channel parameter transmitted by the intelligent reflecting surface to the receiving end, a fifth channel parameter transmitted by the AF relay to the receiving end, reflection coefficients of N reflecting units, a first noise parameter of the AF relay and a second noise parameter of the receiving end; performing enhancement optimization processing on the first channel parameter, the second channel parameter, the third channel parameter, the fourth channel parameter, the fifth channel parameter and the N reflection coefficients to obtain the sending power of an optimized transmitting end, the transmitting power of an AF relay, N first half transmission period reflection coefficients and N second half transmission period reflection coefficients of an intelligent reflecting surface; in the first half transmission period, controlling the transmitting end and the intelligent reflecting surface to operate through the transmitting power and the reflection coefficients of N first half transmission periods to obtain a first receiving signal of the receiving end and a transmitting signal of the intelligent reflecting surface; and in the second half transmission period, the AF relay and the intelligent reflecting surface are controlled to operate through the sending power, the sending signal and the reflection coefficients of N second half transmission periods, and an amplified signal output by the AF relay and a second receiving signal of a receiving end are obtained. By the wireless communication method based on the IRS-assisted AF relay, the intelligent reflecting surface and the AF relay can be combined to be used for data transmission of a wireless communication system, so that the method has the advantages of intelligent reflecting surface and AF relay data transmission, and the technical problem that the IRS and the AF relay are used for a wireless cooperative communication system independently and are not combined to be applied to the wireless communication system at present is solved. The wireless communication method controls the operation of the transmitting end, the AF relay, the intelligent reflecting surface and the receiving end by optimizing the configurable parameters of the wireless communication system and by optimizing the transmitting power of the transmitting end, the transmitting power of the AF relay, the N first half transmission period reflection coefficients and the N second half transmission period reflection coefficients of the intelligent reflecting surface, so that the communication transmission efficiency and the channel capacity between the transmitting end and the receiving end can be enhanced, and the robustness of the wireless communication is enhanced.
The wireless communication method based on the IRS assisted AF relay is simple in calculation method, small in calculation amount, and fast in speed.
In one embodiment of the present invention, the wireless communication method based on IRS assisted AF relay comprises:
calculating a third channel parameter, a fourth channel parameter, a first channel parameter, a sending power and a second noise parameter by adopting a first received signal formula to obtain a first received signal of a receiving end in the first half transmission period;
calculating a fifth channel parameter, a fourth channel parameter, a second channel parameter, sending power, a first noise parameter and a second noise parameter by adopting a second received signal formula to obtain a second received signal of a receiving end of a latter half transmission period;
carrying out maximum ratio combining processing on the first receiving signal and the second receiving signal to obtain a receiving signal of a receiving end;
wherein, the first received signal formula is:
Figure BDA0003538871730000111
in the formula, yd1First received signal of first half transmission period of receiving end, hsdIs a third channel parameter, hid TFor the fourth channel parameter hidTranspose of hsiIs a first channel parameter, psFor the transmit power of the transmitting end, s is the transmit signal with mean square value of 1, zdA second noise parameter of the receiving end;
the second received signal formula is:
Figure BDA0003538871730000112
Figure BDA0003538871730000113
in the formula, yd2A second received signal of a second half transmission period of the receiving end, hrdIs a fifth channel parameter, hid TFor the fourth channel parameter hidTranspose of hsiIs a first channel parameter, hir TOutputting an amplified signal h for AF relayingirTranspose of (p)sFor the transmit power of the transmitting end, s is the transmit signal with mean square value of 1, zdIs a second noise parameter, z 'of the receiving end'rFirst noise parameter, p, relayed for AFrTransmit power, h, for AF relayingsrAs the second channel parameter, the channel parameter,
Figure BDA0003538871730000121
variance of first noise parameter Gaussian distribution for AF relay, diagonal matrix
Figure BDA0003538871730000122
Is a matrix of N first half transmission period reflection coefficients, ηn∈[0,1]，θnE [0,2 π)), diagonal matrix
Figure BDA0003538871730000123
Is a matrix of N second half transmission periods of reflection coefficient, pn∈[0,1]，φnE [0,2 π), j is an imaginary unit of the complex number, and
Figure BDA0003538871730000124
n is a natural number greater than 1.
In the embodiment of the present invention, the maximum ratio combining processing on the first received signal and the second received signal means that the first received signal and the second received signal are multiplied by weighting coefficients that are respectively proportional to their corresponding signal-to-noise ratios, and then added to obtain the received signal of the receiving end. That is, a first processed received signal is obtained by multiplying a first received signal by a weighting factor proportional to the signal-to-noise ratio thereof, a second processed received signal is obtained by multiplying a second received signal by a weighting factor proportional to the signal-to-noise ratio thereof, and the first processed received signal and the second processed received signal are added to obtain a received signal.
It should be noted that, in the communication signal processing, the maximum ratio combining processing is a relatively mature, common and common technology in the art, and in this embodiment, specific contents of the maximum ratio combining processing are not explained in detail.
In the embodiment of the present invention, in step S4, the transmission signal received by the AF relay is multiplied by a complex amplification factor
Figure BDA0003538871730000125
Order to
Figure BDA0003538871730000126
Then, the transmission signal is sent out in the second half transmission period, and the transmission signal of the AF relay is as follows:
Figure BDA0003538871730000127
in an embodiment of the present invention, the maximum ratio combining processing is performed on the first received signal and the second received signal to obtain the received signal of the receiving end, so as to obtain the signal-to-noise ratio of the received signal, where the signal-to-noise ratio is:
Figure BDA0003538871730000128
in one embodiment of the present invention, the wireless communication method based on the IRS assisted AF relay includes: calculating the first channel parameter, the second channel parameter, the third channel parameter, the fourth channel parameter, the fifth channel parameter and the N reflection coefficients by adopting a power optimization distribution formula to obtain the optimized transmitting power of the transmitting terminal and the transmitting power of the AF relay, wherein the power optimization distribution formula is as follows:
Figure BDA0003538871730000131
Figure BDA0003538871730000132
Figure BDA0003538871730000133
Figure BDA0003538871730000134
in the formula, psFor the transmit power of the transmitting end, prTransmit power, h, for AF relayingsdIs a third channel parameter, hid TFor the fourth channel parameter hidTranspose of hsiIs a first channel parameter, hsrAs the second channel parameter, the channel parameter,
Figure BDA0003538871730000135
the variance of the gaussian distribution of the first noise parameter relayed for AF,
Figure BDA0003538871730000136
is the variance, h, of the Gaussian distribution of the second noise parameter at the receiving endrdIs a fifth channel parameter, hir TOutputting an amplified signal h for AF relayingirP is the total power of the transmitting end and the AF relay, Pr+ps≤P。
It should be noted that, the channel parameters of the wireless communication system are enhanced and optimized mainly by a power optimization allocation formula, so as to obtain the optimized transmission power and transmission power.
In one embodiment of the present invention, the wireless communication method based on IRS assisted AF relay comprises: calculating the first channel parameter, the second channel parameter, the third channel parameter, the fourth channel parameter and the fifth channel parameter by adopting a reflection coefficient optimization formula to obtain N first half transmission period reflection coefficients and N second half transmission period reflection coefficients of the optimized intelligent reflecting surface, wherein the reflection coefficient optimization formula is as follows:
Figure BDA0003538871730000137
Figure BDA0003538871730000138
in the formula (I), the compound is shown in the specification,
Figure BDA0003538871730000139
to optimize the first half transmission cycle reflection coefficient of the last nth reflection unit,
Figure BDA00035388717300001310
in order to optimize the reflection coefficient of the second half transmission period of the nth reflection unitsrIs a second channel parameter, hsiIs a first channel parameter, hirAmplified signal output for AF relay, hrdIs a fifth channel parameter, hidAnd N belongs to N as a fourth channel parameter, wherein N is a natural number greater than 1.
It should be noted that, the channel parameters of the wireless communication system are enhanced and optimized mainly by a reflection coefficient optimization formula, so as to obtain optimized N reflection coefficients of the first half transmission period and N reflection coefficients of the second half transmission period, and the signals are transmitted in the first half transmission period and the second half transmission period by controlling the reflection coefficients of the first half transmission period and the second half transmission period, so as to achieve the purpose of enhancing the signal-to-noise ratio or capacity of the received signals at the receiving end.
Example two:
fig. 4 is a block diagram of a wireless communication device based on IRS assisted AF relay according to an embodiment of the present invention.
As shown in fig. 4, an embodiment of the present invention further provides a wireless communication apparatus based on IRS assisted AF relay, which is applied to a wireless communication system, where the wireless communication system includes a transmitting end, an intelligent reflective surface, an AF relay, and a receiving end, the intelligent reflective surface includes N transmitting units, and the wireless communication apparatus includes a data acquisition module 101, a central computing module 102 connected to the data acquisition module 101, and a control module 103 connected to the central computing module 102;
a data acquisition module 101, configured to acquire parameter data of a wireless communication system;
the central calculation module 102 is configured to perform calculation according to the parameter data to obtain the transmission power of the transmitting end, the transmission power of the AF relay, N first half transmission cycle reflection coefficients and N second half transmission cycle reflection coefficients of the intelligent reflecting surface;
the control module 103 is configured to control operations of the transmitting end, the intelligent reflecting surface, the AF relay, and the receiving end according to the wireless communication method based on the IRS assisted AF relay;
the parameter data comprises a first channel parameter, a second channel parameter, a third channel parameter, a fourth channel parameter transmitted by the intelligent reflection surface to the receiving end, a fifth channel parameter transmitted by the AF relay to the receiving end, reflection coefficients of the N reflection units, a first noise parameter of the AF relay and a second noise parameter of the receiving end, wherein the first channel parameter, the second channel parameter and the third channel parameter are transmitted by the transmitting end to the intelligent reflection surface, the AF relay and the receiving end.
It should be noted that, after the channel parameters between the nodes in the wireless communication system are transmitted to the central computing module 102 through the feedback channel, the control channel, or other dedicated channels, a new round of enhanced optimization calculation is started, and the calculation results are transmitted to the control module 103 of each node through the feedback channel, the control channel, or other dedicated channels to control the transmission of signals. In this embodiment, after a new transmission period of a wireless communication system starts, the central computing module 102 monitors a feedback/control channel, and receives channel parameters sent back by other nodes in the wireless communication system through the data acquisition module 101; once the channel parameters of all the nodes are received, starting optimization calculation; after the calculation is completed, the calculation result is sent to the control module 103 of the corresponding node through the feedback/control channel to adjust the corresponding node parameter, that is, to control and adjust the corresponding parameter, thereby achieving the purpose of improving the signal transmission efficiency and the channel capacity of the wireless communication system. Specifically, the transmitting end and the AF relay adjust the respective sending powers, and the IRS adjusts the reflection coefficients of the reflection units, so as to achieve the optimal transmission effect of the wireless communication system, and achieve the purpose of enhancing the signal-to-noise ratio or capacity of the received signal at the receiving end.
In this embodiment of the present invention, the central calculation module 102 is configured to calculate by using a reflection coefficient optimization formula and a power optimization distribution formula, to obtain the transmission power of the transmitting end, the transmission power of the AF relay, and the reflection coefficients of N first half transmission periods and N second half transmission periods of the intelligent reflection surface.
In the embodiment of the invention, the power optimization allocation formula is as follows:
Figure BDA0003538871730000151
Figure BDA0003538871730000152
Figure BDA0003538871730000153
Figure BDA0003538871730000154
in the formula, psFor the transmit power of the transmitting end, prTransmit power, h, for AF relayingsdIs a third channel parameter, hid TFor the fourth channel parameter hidTranspose of hsiIs a first channel parameter, hsrAs the second channel parameter, is a parameter of the second channel,
Figure BDA0003538871730000155
the variance of the gaussian distribution of the first noise parameter relayed for AF,
Figure BDA0003538871730000156
is the variance, h, of the Gaussian distribution of the second noise parameter at the receiving endrdIs a fifth channel parameter, hir TFor AF relayingOutput of an amplified signal hirP is the total power of the transmitting end and the AF relay, Pr+ps≤P；
The reflection coefficient optimization formula is as follows:
Figure BDA0003538871730000157
Figure BDA0003538871730000158
in the formula (I), the compound is shown in the specification,
Figure BDA0003538871730000159
in order to optimize the reflection coefficient of the first half transmission period of the back nth reflection unit,
Figure BDA00035388717300001510
in order to optimize the reflection coefficient of the second half transmission period of the nth reflection unitsrIs a second channel parameter, hsiIs a first channel parameter, hirAmplified signal output for AF relay, hrdIs a fifth channel parameter, hidAnd N belongs to N as a fourth channel parameter, wherein N is a natural number greater than 1.
In this embodiment of the present invention, the control module 103 is further configured to control operations of the transmitting end, the intelligent reflecting surface, the AF relay, and the receiving end according to the above-mentioned wireless communication method based on the IRS-assisted AF relay after receiving the transmitting power, the N first half transmission cycle reflection coefficients, and the N second half transmission cycle reflection coefficients transmitted by the central computing module 102, so that the transmitting end performs data transmission to the receiving end.
It should be noted that, the content of the wireless communication method based on the IRS-assisted AF relay in the second embodiment system is already described in detail in the first embodiment, and the content of the wireless communication method based on the IRS-assisted AF relay is not described in detail in the second embodiment.
Fig. 5 is a schematic diagram of coordinates of a wireless communication system in a wireless communication apparatus based on IRS-assisted AF relay according to an embodiment of the present invention, fig. 6 is a schematic diagram of a change of an average channel capacity of the wireless communication system with a transmission signal-to-noise ratio in the wireless communication apparatus based on IRS-assisted AF relay according to an embodiment of the present invention, and fig. 7 is a schematic diagram of a change of the average channel capacity of the wireless communication system with the number of IRS reflecting units in the wireless communication apparatus based on IRS-assisted AF relay according to an embodiment of the present invention.
In the embodiment of the present invention, the method and apparatus for wireless communication based on IRS assisted AF relay are simulated by using MATLAB tool, the parameter settings of the wireless communication system are as shown in fig. 5, and on the two-dimensional coordinate plane, the coordinates of the transmitting end, IRS, AF relay node and the receiving end are (-30, 0), (0, 5), (0, -5) and (30, 0), respectively, and the unit is meter. The path loss model adopts simplified L (d) ═ d-αD is the distance between two nodes in meters and α is the path loss factor, set to 2.5. The channel from the transmitting end to the receiving end is a small-scale Rayleigh fading channel, i.e.
Figure BDA0003538871730000161
The other channels are Laisi fading channels, and the channel model is as follows:
Figure BDA0003538871730000162
wherein, k is a Rice factor, k is 2, hLoSAs line-of-sight term, hNLoSAre non-line-of-sight items. For convenience, the noise variance of the AF relay node and the receiving end is set to 1, i.e., 1
Figure BDA0003538871730000163
Defining the SNR as P/sigma2Fig. 6 is a schematic diagram of the change of the average channel capacity of the wireless communication system with the number of IRS reflection units when the number N of IRS reflection units is 40, and fig. 7 is a schematic diagram of the change of the average channel capacity of the wireless communication system with the number of IRS reflection units when the SNR of the transmission signal to noise ratio is 40 dB. As can be seen from fig. 6 and 7, the wireless communication apparatus and method based on IRS assisted AF relay can effectively improve signal transmission efficiency and channelCapacity.
It should be noted that, the wireless communication device based on IRS-assisted AF relay can fully utilize the advantages of both IRS and AF relay communication technologies through the central computing module and the control module, so that the performance of data transmission of the wireless communication system is far better than that of the AF relay communication system and the IRS-assisted communication system.
Example three:
the embodiment of the invention provides wireless communication equipment based on an IRS (intelligent resilient framework) assisted AF (automatic frequency hopping) relay, which comprises a processor and a memory, wherein the processor is used for processing an AF relay;
a memory for storing the program code and transmitting the program code to the processor;
a processor configured to execute the above-mentioned wireless communication method based on IRS assisted AF relay according to instructions in program code.
It should be noted that the processor is configured to execute the steps in the above-mentioned embodiment of the wireless communication method based on IRS assisted AF relay according to the instructions in the program code. Alternatively, the processor, when executing the computer program, implements the functions of each module/unit in each system/apparatus embodiment described above.
Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in a memory and executed by a processor to accomplish the present application. One or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of a computer program in a terminal device.
The terminal device may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing device. The terminal device may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the terminal device is not limited and may include more or fewer components than those shown, or some components may be combined, or different components, e.g., the terminal device may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal device. Further, the memory may also include both an internal storage unit of the terminal device and an external storage device. The memory is used for storing computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A wireless communication method based on IRS assisted AF relay is applied to a wireless communication system, the wireless communication system comprises a transmitting end, an intelligent reflecting surface, AF relay and a receiving end, the intelligent reflecting surface comprises N transmitting units, and the wireless communication method is characterized by comprising the following steps:
acquiring a first channel parameter, a second channel parameter and a third channel parameter transmitted by the transmitting end to the intelligent reflecting surface, the AF relay and the receiving end, and acquiring a fourth channel parameter transmitted by the intelligent reflecting surface to the receiving end, a fifth channel parameter transmitted by the AF relay to the receiving end, reflection coefficients of N reflecting units, a first noise parameter of the AF relay and a second noise parameter of the receiving end;
performing enhancement optimization processing on the first channel parameter, the second channel parameter, the third channel parameter, the fourth channel parameter, the fifth channel parameter, and the N reflection coefficients to obtain optimized sending power of the sending end, optimized sending power of the AF relay, N first half transmission cycle reflection coefficients and N second half transmission cycle reflection coefficients of the intelligent reflecting surface;
in the first half transmission period, controlling the transmitting end and the intelligent reflecting surface to operate through the transmitting power and N reflection coefficients of the first half transmission period to obtain a first receiving signal of the receiving end and a transmitting signal of the intelligent reflecting surface;
and in the second half transmission period, the AF relay and the intelligent reflecting surface are controlled to operate through the sending power, the sending signal and N second half transmission period reflection coefficients, and an amplified signal output by the AF relay and a second receiving signal of the receiving end are obtained.
2. The IRS-assisted AF relay based wireless communication method of claim 1, comprising:
calculating the third channel parameter, the fourth channel parameter, the first channel parameter, the sending power and the second noise parameter by adopting a first received signal formula to obtain a first received signal of the receiving end in the first half transmission period;
calculating the fifth channel parameter, the fourth channel parameter, the second channel parameter, the sending power, the first noise parameter and the second noise parameter by adopting a second received signal formula to obtain a second received signal of the receiving end in a second half transmission period;
and carrying out maximum ratio combining processing on the first receiving signal and the second receiving signal to obtain a receiving signal of the receiving end.
3. The method of claim 2, wherein the first received signal formula is:
Figure FDA0003538871720000021
in the formula, yd1Is the first received signal of the first half transmission period of the receiving end, hsdIs a third channel parameter, hid TFor the fourth channel parameter hidTranspose of hsiIs a first channel parameter, psFor the transmit power of the transmitting end, s is the transmit signal with mean square value of 1, zdA second noise parameter of the receiving end;
the second received signal formula is:
Figure FDA0003538871720000022
Figure FDA0003538871720000023
in the formula, yd2A second received signal of a half transmission period of the receiving end, hrdParticipating in the fifth channelNumber, hid TFor the fourth channel parameter hidTranspose of hsiIs a first channel parameter, hir TOutputting an amplified signal h for AF relayingirTranspose of (p)sFor the transmit power of the transmitting end, s is the transmit signal with mean square value of 1, zdIs a second noise parameter, z 'of the receiving end'rFirst noise parameter, p, relayed for AFrTransmit power, h, for AF relayingsrAs the second channel parameter, the channel parameter,
Figure FDA0003538871720000024
variance of first noise parameter Gaussian distribution for AF relay, diagonal matrix
Figure FDA0003538871720000025
Is a matrix of N first half transmission period reflection coefficients, ηn∈[0,1]，θnE [0,2 π), diagonal matrix
Figure FDA0003538871720000026
Is a matrix of N second half transmission periods of reflection coefficient, pn∈[0,1]，φnBelongs to [0,2 pi ]), N belongs to N, and N is a natural number more than 1.
4. The method of wireless communication based on IRS-assisted AF relay according to claim 2, comprising: calculating the first channel parameter, the second channel parameter, the third channel parameter, the fourth channel parameter and the fifth channel parameter by using a reflection coefficient optimization formula to obtain optimized N first half transmission period reflection coefficients and N second half transmission period reflection coefficients of the intelligent reflecting surface, wherein the reflection coefficient optimization formula is as follows:
Figure FDA0003538871720000027
Figure FDA0003538871720000028
in the formula (I), the compound is shown in the specification,
Figure FDA0003538871720000029
to optimize the first half transmission cycle reflection coefficient of the last nth reflection unit,
Figure FDA00035388717200000210
in order to optimize the reflection coefficient of the second half transmission period of the nth reflection unitsrIs a second channel parameter, hsiIs a first channel parameter, hirAmplified signal output for AF relay, hrdIs a fifth channel parameter, hidAnd N belongs to N as a fourth channel parameter, wherein N is a natural number greater than 1.
5. The method of wireless communication based on IRS-assisted AF relay according to claim 1, comprising: calculating the first channel parameter, the second channel parameter, the third channel parameter, the fourth channel parameter, the fifth channel parameter, and the N reflection coefficients by using a power optimization distribution formula to obtain the optimized transmission power of the transmitting terminal and the transmission power of the AF relay, where the power optimization distribution formula is:
Figure FDA0003538871720000031
Figure FDA0003538871720000032
Figure FDA0003538871720000033
Figure FDA0003538871720000034
in the formula, psFor the transmit power of the transmitting end, prTransmit power, h, for AF relayingsdIs a third channel parameter, hid TFor the fourth channel parameter hidTranspose of hsiIs a first channel parameter, hsrAs the second channel parameter, the channel parameter,
Figure FDA0003538871720000035
the variance of the gaussian distribution of the first noise parameter relayed for AF,
Figure FDA0003538871720000036
is the variance, h, of the Gaussian distribution of the second noise parameter at the receiving endrdIs a fifth channel parameter, hir TOutputting an amplified signal h for AF relayingirP is the total power of the transmitting end and the AF relay, Pr+ps≤P。
6. A wireless communication device based on IRS assists AF relay is applied to a wireless communication system, the wireless communication system comprises a transmitting terminal, an intelligent reflecting surface, AF relay and a receiving terminal, the intelligent reflecting surface comprises N transmitting units, and the wireless communication device is characterized by comprising: the system comprises a data acquisition module, a central computing module connected with the data acquisition module and a control module connected with the central computing module;
the data acquisition module is used for acquiring parameter data of the wireless communication system;
the central calculation module is used for calculating according to the parameter data to obtain the sending power of the transmitting end, the transmitting power of the AF relay, N first half transmission period reflection coefficients and N second half transmission period reflection coefficients of the intelligent reflecting surface;
the control module is used for controlling the operation of the transmitting terminal, the intelligent reflecting surface, the AF relay and the receiving terminal according to the wireless communication method based on the IRS assisted AF relay in any one of claims 1 to 5;
the parameter data includes a first channel parameter, a second channel parameter, a third channel parameter, a fourth channel parameter transmitted by the intelligent reflector to the receiving end, a fifth channel parameter transmitted by the AF relay to the receiving end, reflection coefficients of N reflection units, a first noise parameter of the AF relay, and a second noise parameter of the receiving end, which are transmitted by the transmitting end to the intelligent reflector, the AF relay, and the receiving end.
7. The IRS-assisted AF relay based wireless communication device of claim 6, wherein the central calculation module is configured to calculate by using a reflection coefficient optimization formula and a power optimization distribution formula, to obtain the transmission power of the transmitting end, the transmission power of the AF relay, N first half transmission period reflection coefficients and N second half transmission period reflection coefficients of the intelligent reflection surface.
8. The IRS-assisted AF relay based wireless communication apparatus of claim 7, wherein the power-optimized allocation formula is:
Figure FDA0003538871720000041
Figure FDA0003538871720000042
Figure FDA0003538871720000043
Figure FDA0003538871720000044
in the formula, psFor the transmit power of the transmitting end, prTransmit power, h, for AF relayingsdIs a third channel parameter, hid TFor the fourth channel parameter hidTranspose of hsiIs a first channel parameter, hsrAs the second channel parameter, the channel parameter,
Figure FDA0003538871720000045
the variance of the gaussian distribution of the first noise parameter relayed for AF,
Figure FDA0003538871720000046
is the variance, h, of the Gaussian distribution of the second noise parameter at the receiving endrdIs a fifth channel parameter, hir TOutputting an amplified signal h for AF relayingirP is the total power of the transmitting end and the AF relay, Pr+ps≤P；
The reflection coefficient optimization formula is as follows:
Figure FDA0003538871720000051
Figure FDA0003538871720000052
in the formula (I), the compound is shown in the specification,
Figure FDA0003538871720000053
to optimize the first half transmission cycle reflection coefficient of the last nth reflection unit,
Figure FDA0003538871720000054
in order to optimize the reflection coefficient of the second half transmission period of the nth reflection unitsrIs a second channel parameter, hsiIs a first channel parameter, hirAmplified signal relayed for AF, hrdIs a fifth channel parameter, hidFor the fourth channel parameter, N is N, N is a natural number greater than 1And (4) counting.
9. The device of claim 6, wherein the control module is further configured to control operations of the transmitting end, the intelligent reflective surface, the AF relay, and the receiving end according to the wireless communication method of any one of claims 1 to 5 after receiving the transmission power, the first half transmission cycle reflection coefficient and the second half transmission cycle reflection coefficient transmitted by the central computing module, so that the transmitting end performs data transmission to the receiving end.
10. A wireless communication device based on IRS assisted AF relay, comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor configured to execute the wireless communication method based on IRS assisted AF relay of any of claims 1 to 5 according to instructions in the program code.
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