CN113783812B - Intelligent surface synchronous signal enhancement and interference suppression method based on synchronous transmission and reflection - Google Patents

Intelligent surface synchronous signal enhancement and interference suppression method based on synchronous transmission and reflection Download PDF

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CN113783812B
CN113783812B CN202110816896.0A CN202110816896A CN113783812B CN 113783812 B CN113783812 B CN 113783812B CN 202110816896 A CN202110816896 A CN 202110816896A CN 113783812 B CN113783812 B CN 113783812B
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CN113783812A (en
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侯天为
孙昕
王俊
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Beijing Jiaotong University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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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 an intelligent surface synchronization based on synchronous transmission and reflectionSignal enhancement and interference suppression method, STAR-RIS, in a cellular network, based on channel information from base station 2 to subscriber 1, c 2 Estimating the strength of interference received by the user 1, c; from base station 2 and STAR-RIS 2 And STAR-RIS 2 And the channel of user 1, c, with STAR-RIS, targeted at the minimization of the interference received by the user 2 The transmission amplitude coefficient and the transmission phase coefficient are constraint conditions, and STAR-RIS is determined 2 The interference suppression method of (1). In determining STAR-RIS 2 After the transmission amplitude coefficient and the transmission phase coefficient, the residual energy is utilized to maximize the effective signal received by the user as a target, and STAR-RIS is used 1 The reflection amplitude coefficient, the reflection phase coefficient and the total energy are taken as constraint conditions to determine STAR-RIS 1 The signal enhancement method of (3).

Description

Synchronous transmission reflection based intelligent surface synchronous signal enhancement and interference suppression method
Technical Field
The invention relates to the technical field of wireless communication, in particular to an intelligent surface synchronous signal enhancement and interference suppression method based on synchronous transmission reflection.
Background
A synchronous transmission and reflection reconfigurable intelligent surface (STAR-RIS) is one of the solutions to increase spectral and energy efficiency in the sixth generation (6G) wireless communication systems. By properly controlling the interaction between an RIS (reconfigurable intelligent surface) element and incident electromagnetic waves, the phase coefficient and the amplitude coefficient of reflected waves can be effectively controlled, the strength of received signals can be effectively enhanced or weakened, and the performance of a wireless communication system is improved. However, the RIS-based communication method is a key challenging problem, and generally only concerns signal enhancement or interference suppression problems, which cannot be synchronized.
In the existing scheme, the signal enhancement method can simultaneously increase the interference signals received by the user, and the interference suppression method can reduce the effective signals received by the user, which can reduce the performance of the wireless communication system. Since each RIS element is a passive patch element, part of electromagnetic waves can also pass through the RIS while being reflected, so researchers have shown more and more interest in the new concept of STAR-RIS. In STAR-RIS, an incident wireless signal can be reflected in the half-space on the same side as STAR-RIS, while an incident wireless signal can also be transmitted into the half-space on the other side of STAR-RIS. Thus, the reflection characteristic and the transmission characteristic of STAR-RIS are utilized to realize the synchronization signal enhancement and interference suppression method.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an intelligent surface synchronization signal enhancement and interference suppression method based on synchronous transmission reflection.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a synchronous transflective reconfigurable smart surface (STAR-RIS) based wireless communication system, comprising: base station 1 Cell 1, user 1，c User, user 1，e 、STAR-RIS 1 、STAR-RIS 2 Base station 2 Cell 2, user 2，c And the user 2，e ；
The STAR-RIS 1 The method comprises the following steps: RIS 1 Controller and RIS 1 Panel, RIS 1 Controller controlling RIS 1 Panel, RIS 1 Number of RIS elements on panel is L 1 Represents;
said STAR-RIS 2 The method comprises the following steps: RIS 2 Controller and RIS 2 Panel, RIS 2 Controller controlling RIS 2 Panel, RIS 2 Number of RIS elements on panel is L 2 Represents;
user' s 1，c Represents a central user c, user within cell 1 1，e Indicating edge user e, user within cell 1 2，c Represents a central user c, user within cell 2 2，e Represents an edge user e within cell 2;
base station 1 And the user 1，c And the user 1，e The channel between is an effective channel, the base station 2 And the user 1，c And the user 1，e The channel in between is an interference channel, which passes through STAR-RIS 2 And the user 1，c And the user 1，e The channel between is a transmission channel, and the effective channel passes through STAR-RIS 1 And the user 1，c And the user 1，e A channel in betweenThe channel is reflected.
Based on the above protocol, the STAR-RIS 1 Transmission matrix phi 1,T And reflection matrix phi 1,R The expressions of (a) are respectively as follows:
Figure BDA0003170455860000031
Figure BDA0003170455860000032
wherein, beta 1,T,l ∈(0,1],l＝1,2,…L 1 And beta 1,R,l ∈(0,1],l＝1,2,…L 1 Respectively represent STAR-RIS 1 And satisfies the transmission amplitude coefficient and the reflection amplitude coefficient
Figure BDA0003170455860000033
STAR-RIS 1 Transmission phase coefficient phi of 1,T,l And a reflection phase coefficient phi 1,R,l The expressions of (a) are respectively as follows:
Figure BDA0003170455860000034
Figure BDA0003170455860000035
in the above formula, j represents an imaginary number, θ 1,T,l Represents STAR-RIS 1 Transmission phase of (e), theta 1,R,l Represents STAR-RIS 1 The reflection phase of (2).
Based on the above protocol, the STAR-RIS 2 Transmission matrix phi 2,T And reflection matrix phi 2,R The expressions of (a) are respectively as follows:
Figure BDA0003170455860000036
Figure BDA0003170455860000037
wherein, beta 2,T,l ∈(0,1],l＝1,2,…L 2 And beta 2,R,l ∈(0,1],l＝1,2,…L 2 Respectively represent STAR-RIS 2 And satisfies the transmission amplitude coefficient and the reflection amplitude coefficient
Figure BDA0003170455860000038
STAR-RIS 2 Transmission phase coefficient phi of 2,T,l And reflection phase coefficient phi 2,R,l The expressions of (a) are respectively as follows:
Figure BDA0003170455860000039
Figure BDA00031704558600000310
in the above formula, j represents an imaginary number, θ 2,T,l Represents STAR-RIS 2 Transmission phase of (e), theta 2,R,l Represents STAR-RIS 2 The reflection phase of (1).
A synchronous transmission reflection based intelligent surface synchronous signal enhancement and interference suppression method is applied to the wireless communication system and specifically comprises the following steps:
step S1, sending effective channel gain, interference channel gain, reflection channel gain and transmission channel gain to RIS 1 Controller and RIS 2 Controller of RIS 1 Controller and RIS 2 The controller acquires all channel gain information;
step S2, suppose base station 1 User, user 1，c User, user 1，e Base station 2 User, user 1，c And the user 1，e All are single antenna, adopt non-orthogonal multiple access technique, user 1，c And the user 1，e Share the same time, frequency and code domain resources,user' s 2，c And the user 2，e The same time domain, frequency domain and code domain resources are shared, and then the users 1，c Received valid signal y 1,c,u Expressed as:
Figure BDA0003170455860000041
in the above formula,. Epsilon 1,1,c Indicating base stations 1 To the user 1，c Large scale fading, w 1,1,c Representing base station 1 to user 1，c Small scale fading, p 1 Indicating base stations 1 Of transmission power of epsilon 1,R,c Representing base station 1-STAR-RIS 1 -user 1，c Reflection of (2) large scale fading, R 1,1,c Represents STAR-RIS 1 -user 1，c Reflection of small scale fading, phi 1,R Represents STAR-RIS 1 Reflection matrix of H 1 Indicating a base station 1 To STAR-RIS 1 The small-scale fading matrix of (1);
user' s 1，c Received interference signal y 1,c,i Expressed as:
Figure BDA0003170455860000042
in the above formula,. Epsilon 2,1,c Indicating a base station 2 To the user 1，c Large scale fading, w 2,1,c Indicating base stations 2 To the user 1，c Small scale fading of epsilon 2,T,c Indicating base stations 2 -STAR-RIS 2 -user 1，c Transmission of large scale fading, p 2 Indicating a base station 2 Of transmitted power, T 2,1,c Represents STAR-RIS 2 -user 1，c Transmission small scale fading, phi 2,T Represents STAR-RIS 2 Transmission matrix of H 2 Indicating a base station 2 To STAR-RIS 2 The small-scale fading matrix of (1);
user' s 1，c Received signal y 1,c Expressed as:
Figure BDA0003170455860000051
in the above formula, N 0 Is additive white gaussian noise;
step S3, according to the user 1，c Interference signal received, using STAR-RIS 2 Suppressing the user with the transmitted signal 1，c The received interference, and the corresponding interference suppression problem, can be defined as:
Figure BDA0003170455860000052
Figure BDA0003170455860000053
Figure BDA0003170455860000054
Figure BDA0003170455860000055
in the above formula,. Epsilon 2,1,e Indicating a base station 2 To the user 1，e Large scale fading, w 2,1,e Indicating a base station 2 To the user 1，e Small scale fading of epsilon 2,T,e Indicating a base station 2 -STAR-RIS 2 -the user 1，e Transmission large scale fading, T 2,1,e Represents STAR-RIS 2 -user 1，e Transmitted small-scale fading, beta 2,T,l Represents STAR-RIS 2 Coefficient of transmission amplitude phi 2,T,l Represents STAR-RIS 2 The transmission phase coefficient of (a);
where P1 and P2 are the optimization problem for the center user c and edge user e, respectively, within cell 1, and the transmission amplitude coefficient constraint (P1 a) describes STAR-RIS 2 The transmission phase coefficient constraint (P1 b) describes STAR-RIS 2 In the present invention, it is assumed that it is continuously ideally controllable;
with the aim of eliminating the interference received by each user, and therefore the RIS 2 The controller first generates an interference matrix I 2,1 Comprises the following steps:
Figure BDA0003170455860000061
to design STAR-RIS 2 Transmission amplitude coefficient and transmission phase coefficient of, requires to generate STAR-RIS 2 Equivalent transmission matrix of
Figure BDA0003170455860000062
The expression is as follows:
Figure BDA0003170455860000063
wherein: h is 2,R,l ,l＝1,2,…,L 2 Indicating a base station 2 Small scale fading to the l-th RIS element, t 2,1,c,l ,l＝1,2,…,L 2 Indicating base stations 2 First RIS element user 1，c Transmission channel gain of t 2,1,e,l ,l＝1,2,…,L 2 Indicating a base station 2 First RIS element user 1，e The transmission channel gain of (a);
to calculate STAR-RIS 2 Transmission matrix of, requires the generation of STAR-RIS 2 Transmission amplitude and transmission phase vector of
Figure BDA0003170455860000064
The expression is as follows:
Figure BDA0003170455860000065
thus STAR-RIS 2 Is designed to:
Figure BDA0003170455860000066
step S4, after the interference received by the users in the cell 1 is suppressed, using STAR-RIS 1 The reflected signal of (2) enhances the effective signal received by the user in the cell 1, and the corresponding signal enhancement problem can be defined as:
Figure BDA0003170455860000067
Figure BDA0003170455860000068
Figure BDA0003170455860000069
where P3 is the optimization problem for central user c in cell 1, the reflection amplitude coefficient constraint (P3 a) describes STAR-RIS 1 The reflection phase coefficient constraint (P3 b) describes STAR-RIS 1 In the present invention, it is assumed that it is continuously ideally controllable;
targeting the enhancement of the active signal received by the central user c in cell 1, and hence in the RIS 1 The controller first generates an equivalent reflected channel
Figure BDA0003170455860000071
The expression is as follows:
Figure BDA0003170455860000072
to maximize the effective signal received by the user, STAR-RIS in P3 1 Is designed as a reflection amplitude and a reflection phase vector
Figure BDA0003170455860000073
The expression is as follows:
Figure BDA0003170455860000074
wherein: arg is phase;
step S5, when STAR-RIS 1 And STAR-RIS 2 After the above P1, P2 and P3 are completed, the interference received by the user is suppressed and the effective signal is increased, so based on this design, the equivalent signal received by the center user c in the cell 1 is y 1,c The expression is as follows:
Figure BDA0003170455860000075
on the basis of the scheme, the H 1 And R 1,1,c The expressions of (a) are respectively as follows:
Figure BDA0003170455860000076
Figure BDA0003170455860000077
wherein H 1 And R 1,1,c Are respectively L 1 X 1 and 1X L 1 Each element obeys the following rice distribution:
Figure BDA0003170455860000078
Figure BDA0003170455860000079
in the above formula, h 1,R,l Indicating a base station 1 Small scale fading to the l-th RIS element, r 1,c,l Representing the l-th RIS element to the user 1，c Is reflected in a small-scale fading manner,
Figure BDA0003170455860000081
and
Figure BDA0003170455860000082
is the light-weight linear light-emitting diode (LED),
Figure BDA0003170455860000083
and
Figure BDA0003170455860000084
is a direct-of-sight (LoS) component,
Figure BDA0003170455860000085
and
Figure BDA0003170455860000086
is the NLoS component.
On the basis of the scheme, the epsilon 1,1,c Expressed as:
Figure BDA0003170455860000087
wherein d is 1,1,c Indicating base stations 1 To the user 1，c A distance of 1 Indicating a base station 1 To the user 1，c Of said epsilon 1,R,c Expressed as:
Figure BDA0003170455860000088
wherein d is 1,R And d R,1,c Respectively represent base stations 1 To STAR-RIS 1 Distance and STAR-RIS 1 To the user 1，c A distance of 2 Indicating base stations 1 To STAR-RIS 1 A path attenuation coefficient of (a) 3,c Represents STAR-RIS 1 To the user 1，c Path attenuation coefficient of (2) or STAR-RIS 2 To the user 1，c Of said epsilon 2,T,c And ε 2,T,e Are respectively represented as
Figure BDA0003170455860000089
And
Figure BDA00031704558600000810
wherein d is 2,R Indicating base stations 2 To STAR-RIS 2 Distance of d R,1,e Represents STAR-RIS 1 To the user 1，e A distance of 3,e Represents STAR-RIS 1 To the user 1，e Path attenuation coefficient of (2) or STAR-RIS 2 To the user 1，e The path attenuation coefficient of (e), the epsilon 2,1,c Expressed as:
Figure BDA00031704558600000811
wherein d is 2,1,c Indicating base stations 2 To the user 1，c A distance of 4 Indicating a base station 2 To the user 1，c The path attenuation coefficient of (e), the epsilon 2,1,e Expressed as:
Figure BDA00031704558600000812
wherein d is 2,1,e Indicating base stations 2 To the user 1，e Of the distance of (c).
Compared with the prior art, the method for enhancing the synchronous signal and suppressing the interference has the advantages of lower interruption probability, higher communication rate and diversity gain, strong application capability and the like, and is particularly suitable for a cellular network communication system.
Drawings
The invention has the following drawings:
FIG. 1 is a schematic flow chart of a synchronous transflective intelligent surface synchronization signal enhancement and interference suppression method according to the present invention;
FIG. 2 is a schematic structural diagram of a STAR-RIS based wireless communication system provided by the present invention;
fig. 3 is a diagram showing the comparison of the communication rate performance in the case of different RIS element numbers according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to FIGS. 1-3.
In the embodiment of the present invention, synchronization signal enhancement and interference suppression of the cellular network are performed through STAR-RIS, and the proposed method is used to significantly improve the outage probability, the traversal rate, and the like.
The invention provides a wireless communication system based on synchronous transmission reflection reconfigurable intelligent surface (STAR-RIS), as shown in figure 2, comprising: base station 1 Cell 1, user 1，c User, user 1，e 、STAR-RIS 1 、STAR-RIS 2 Cell 2, user 2，c User, user 2，e And base station 2 ；
Said STAR-RIS 1 The method comprises the following steps: RIS 1 Controller and RIS 1 Panel, RIS 1 Controller controls RIS 1 Panel, RIS 1 Number of RIS elements on panel is L 1 Represents;
said STAR-RIS 2 The method comprises the following steps: RIS 2 Controller and RIS 2 Panel, RIS 2 Controller controlling RIS 2 Panel, RIS 2 Number of RIS elements on panel is L 2 Represents;
user' s 1，c Represents the central user c, user within cell 1 1，e Indicates edge user e, user within cell 1 2，c Represents the central user c, user within cell 2 2，e Represents an edge user e within cell 2;
base station 1 And the user 1，c And the user 1，e The channel between is an effective channel, the base station 2 And the user 1，c And the user 1，e The channel in between is an interference channel, which passes through STAR-RIS 2 And the user 1，c And the user 1，e The channel between is a transmission channel, and the effective channel passes through STAR-RIS 1 And the user 1，c And the user 1，e The channel in between is a reflection channel.
Based on the above protocol, the STAR-RIS 1 Transmission matrix phi 1,T And reflection matrix phi 1,R The expressions of (a) are respectively as follows:
Figure BDA0003170455860000101
Figure BDA0003170455860000102
wherein, beta 1,T,l ∈(0,1],l＝1,2,…L 1 And beta 1,R,l ∈(0,1],l＝1,2,…L 1 Respectively represent STAR-RIS 1 And satisfies the transmission amplitude coefficient and the reflection amplitude coefficient
Figure BDA0003170455860000103
STAR-RIS 1 Transmission phase coefficient phi of 1,T,l And reflection phase coefficient phi 1,R,l The expressions of (a) are respectively as follows:
Figure BDA0003170455860000104
Figure BDA0003170455860000105
in the above formula, j represents an imaginary number, θ 1,T,l Represents STAR-RIS 1 Transmission phase of (e), theta 1,R,l Represents STAR-RIS 1 The reflection phase of (2).
Based on the above protocol, the STAR-RIS 2 Transmission matrix phi 2,T And reflection matrix Φ 2,R The expressions of (a) are respectively as follows:
Figure BDA0003170455860000106
Figure BDA0003170455860000107
wherein beta is 2,T,l ∈(0,1],l＝1,2,…L 2 And beta 2,R,l ∈(0,1],l＝1,2,…L 2 Respectively represent STAR-RIS 2 And satisfies the transmission amplitude coefficient and the reflection amplitude coefficient
Figure BDA0003170455860000111
STAR-RIS 2 Transmission phase coefficient of (phi) 2,T,l And a reflection phase coefficient phi 2,R,l The expressions of (a) are respectively as follows:
Figure BDA0003170455860000112
Figure BDA0003170455860000113
in the above formula, j represents an imaginary number, θ 2,T,l Represents STAR-RIS 2 Transmission phase of (a), θ 2,R,l Represents STAR-RIS 2 The reflection phase of (1).
The embodiment of the invention provides a synchronous signal enhancement and interference suppression method based on a synchronous transmission reflection intelligent surface, which specifically comprises the following steps as shown in figure 1:
step S110, sending effective channel gain, interference channel gain, reflection channel gain and transmission channel gain to RIS 1 Controller and RIS 2 Controller of RIS 1 Controller and RIS 2 The controller acquires all channel gain information;
suppose a base station 1 User, user 1，c User, user 1，e Base station 2 User, user 1，c And the user 1，e All of which are single antennas, using non-orthogonal multiple access techniques 1，c And the user 1，e Sharing the same time, frequency and code domain resources, users 2，c And the user 2，e The same time domain, frequency domain and code domain resources are shared, and then the users 1，c Received payload signal y 1,c,u Expressed as:
Figure BDA0003170455860000114
in the above formula, ∈ 1,1,c Indicating base stations 1 To the user 1，c Large scale fading, w 1,1,c Indicating a base station 1 To the user 1，c Small scale fading, p 1 Indicating base stations 1 Of the transmission power of epsilon 1,R,c Indicating a base station 1 -STAR-RIS 1 -user 1，c Reflection of (2) large scale fading, R 1,1,c Represents STAR-RIS 1 -user 1，c Reflection of small scale fading, phi 1,R Represents STAR-RIS 1 Reflection matrix of H 1 Indicating a base station 1 To STAR-RIS 1 The small-scale fading matrix of (2);
user 1，c Received interference signal y 1,c,i Expressed as:
Figure BDA0003170455860000121
in the above formula, ∈ 2,1,c Indicating base stations 2 To the user 1，c Large scale fading, w 2,1,c Indicating a base station 2 To the user 1，c Small scale fading of epsilon 2,T,c Indicating a base station 2 -STAR-RIS 2 -the user 1，c Transmission of large scale fading, p 2 Indicating base stations 2 Transmit power of, T 2,1,c Represents STAR-RIS 2 -user 1，c Transmission of small scale fading, phi 2,T Represents STAR-RIS 2 Transmission matrix of H 2 Indicating base stations 2 To STAR-RIS 2 The small-scale fading matrix of (2);
user' s 1，c Received signal y 1,c Expressed as:
Figure BDA0003170455860000122
in the above formula, N 0 Is additive white gaussian noise;
step S120, according to the user 1，c Received trunkScrambling signals, using STAR-RIS 2 Suppression of user transmission signals 1，c The received interference, and the corresponding interference suppression problem, can be defined as:
Figure BDA0003170455860000123
Figure BDA0003170455860000124
Figure BDA0003170455860000125
Figure BDA0003170455860000126
in the above formula, ∈ 2,1,e Indicating a base station 2 To the user 1，e Large scale fading, w 2,1,e Indicating base stations 2 To the user 1，e Small scale fading of epsilon 2,T,e Indicating a base station 2 -STAR-RIS 2 -user 1，e Transmission large scale fading, T 2,1,e Represents STAR-RIS 2 -the user 1，e Transmission of small scale fading, beta 2,T,l Represents STAR-RIS 2 Transmission amplitude coefficient of phi 2,T,l Represents STAR-RIS 2 The transmission phase coefficient of (a);
where P1 and P2 are the optimization problems for the center user c and edge user e, respectively, within cell 1, and the transmission amplitude coefficient constraint (P1 a) describes STAR-RIS 2 The transmission phase coefficient constraint (P1 b) describes STAR-RIS 2 In the present invention, it is assumed that it is continuously ideally controllable;
with the aim of eliminating the interference received by each user, and therefore the RIS 2 The controller first generates an interference matrix I 2,1 Comprises the following steps:
Figure BDA0003170455860000131
to design STAR-RIS 2 Transmission amplitude coefficient and transmission phase coefficient of, it is necessary to generate STAR-RIS 2 Equivalent transmission matrix of
Figure BDA0003170455860000132
The expression is as follows:
Figure BDA0003170455860000133
wherein: h is a total of 2,R,l ,l＝1,2,…,L 2 Indicating a base station 2 Small scale fading to the l-th RIS element,
t 2,1,c,l ,l＝1,2,…,L 2 indicating a base station 2 First RIS element user 1，c Transmission channel gain of t 2,1,e,l ,l＝1,2,…,L 2 Indicating a base station 2 First RIS element user 1，e The transmission channel gain of (1);
to calculate STAR-RIS 2 Transmission matrix of, requires the generation of STAR-RIS 2 Transmission amplitude and transmission phase vector of
Figure BDA0003170455860000134
The expression is as follows:
Figure BDA0003170455860000135
so STAR-RIS 2 The transmission amplitude and transmission phase vector of (a) are designed to:
Figure BDA0003170455860000141
step S130, after the interference received by the user in the cell 1 is suppressed, using STAR-RIS 1 The reflected signal of (2) enhances the effective signal received by the user in cell 1,the corresponding signal enhancement problem can be defined as:
Figure BDA0003170455860000142
Figure BDA0003170455860000143
Figure BDA0003170455860000144
where P3 is the optimization problem for central user c in cell 1, the reflection amplitude coefficient constraint (P3 a) describes STAR-RIS 1 The reflection phase coefficient constraint (P3 b) describes STAR-RIS 1 In the present invention, it is assumed that it is continuously ideally controllable;
targeting the enhancement of the active signal received by the central user c in cell 1, and hence in the RIS 1 The controller first generates an equivalent reflected channel
Figure BDA0003170455860000145
The expression is as follows:
Figure BDA0003170455860000146
to maximize the effective signal received by the user, STAR-RIS in P3 1 Is designed as a reflection amplitude and a reflection phase vector
Figure BDA0003170455860000147
The expression is as follows:
Figure BDA0003170455860000148
wherein: arg is phase;
step S140, when STAR-RIS 1 And STAR-RIS 2 After the above P1, P2 and P3 are completed, the interference received by the user is suppressed, so based on this design, the equivalent signal received by the center user c in the cell 1 is y 1,c The expression is as follows:
Figure BDA0003170455860000149
on the basis of the scheme, the H 1 And R 1,1,c The expressions of (a) are respectively as follows:
Figure BDA0003170455860000151
Figure BDA0003170455860000152
wherein H 1 And R 1,1,c Are each L 1 X1 and 1 XL 1 Each element obeys the following rice distribution:
Figure BDA0003170455860000153
Figure BDA0003170455860000154
in the above formula, h 1,R,l Indicating a base station 1 Small scale fading to the l-th RIS element, r 1,c,l Representing the l-th RIS element to the user 1，c Is reflected by the light beam of (a) to a small scale fading,
Figure BDA0003170455860000155
and
Figure BDA0003170455860000156
is the light-weight linear light-emitting diode (LED),
Figure BDA0003170455860000157
and
Figure BDA0003170455860000158
is a direct-of-sight (LoS) component,
Figure BDA0003170455860000159
and
Figure BDA00031704558600001510
is the NLoS component.
On the basis of the scheme, the epsilon 1,1,c Expressed as:
Figure BDA00031704558600001511
wherein d is 1,1,c Indicating a base station 1 To the user 1，c A distance of 1 Indicating a base station 1 To the user 1，c Of said epsilon 1,R,c Expressed as:
Figure BDA00031704558600001512
wherein d is 1,R And d R,1,c Respectively represent base stations 1 To STAR-RIS 1 Distance and STAR-RIS 1 To the user 1，c A distance of 2 Indicating base stations 1 To STAR-RIS 1 A path attenuation coefficient of 3,c Represents STAR-RIS 1 To the user 1，c Path attenuation coefficient of (2) or STAR-RIS 2 To the user 1，c Of said epsilon 2,T,c And epsilon 2,T,e Are respectively represented as
Figure BDA00031704558600001513
And
Figure BDA00031704558600001514
wherein d is 2,R Indicating a base station 2 To STAR-RIS 2 Distance of d R,1,e Represents STAR-RIS 1 To the user 1，e A distance of 3,e Represents STAR-RIS 1 To the user 1，e Path attenuation coefficient of (2) or STAR-RIS 2 To the user 1，e The path attenuation coefficient of (e), the epsilon 2,1,c Expressed as:
Figure BDA00031704558600001515
wherein d is 2,1,c Indicating a base station 2 To the user 1，c A distance of 4 Indicating a base station 2 To the user 1，c The path attenuation coefficient of (e), the epsilon 2,1,e Expressed as:
Figure BDA0003170455860000161
wherein d is 2,1,e Indicating a base station 2 To the user 1，e The distance of (c).
Scene settings are shown in fig. 2, and simulation parameters are shown in table 1.
TABLE 1 parameter settings
Base station 1 Distance of the central user c 30 m
Base station 1 Distance of edge user e 60 m
Base station 1 To STAR-RIS 1 Of (2) is 70 m
STAR-RIS 1 Distance to edge user e 15 m
STAR-RIS 1 Distance to central user c 50 m
Base station 2 Distance to the central user c 120 m
Base station 2 Distance to edge user e 90 m
Base station 1 Path fading coefficient to center user c α 1 ＝3
Base station 1 To STAR-RIS 1 Is determined by the path fading coefficient α 2 ＝2.8
STAR-RIS 1 Path fading coefficient to edge user e α 3,e ＝2.5
STAR-RIS 1 Path fading coefficient to center user c α 3,c ＝2.8
Base station 2 Path fading coefficient to user α 4 ＝3.5
Small-scale fading coefficient of NLoS 1
Small scale fading coefficient of LoS 3
Fig. 3 is a diagram showing comparison of performance of communication rates in the case of different RIS element numbers, in which the abscissa indicates the RIS element number and the ordinate indicates the communication rate of the user. Compared with the traditional signal enhancement method and the interference suppression method respectively. The communication rate performance of the user is improved through verification, wherein the performance of the synchronous signal enhancement and interference suppression method is superior to that of the traditional signal enhancement or interference suppression method under the condition of low signal-to-noise ratio; under the condition of high signal-to-noise ratio, the performances of the synchronization signal enhancement and the interference suppression method are superior to those of the traditional signal enhancement or interference suppression method.
In summary, the invention provides a synchronous transmission reflection-based intelligent surface synchronization signal enhancement and interference suppression method. In the downlink stage, a user receives effective signals and interference signals, the signals are transmitted and reflected to the user through the STAR-RIS, interference suppression is carried out through transmission by the STAR-RIS, then signal enhancement is carried out through reflection, and the communication performance of the user is enhanced. All RIS elements of a STAR-RIS in the present invention are passive. Therefore, the invention not only can restrain the interference among the cells, but also can strengthen the effective signals received by the users at the same time, thereby improving the quality of the communication system.
Those not described in detail in this specification are well within the skill of the art.

Claims (5)

1. A synchronous transmission reflection-based intelligent surface synchronous signal enhancement and interference suppression method is applied to a wireless communication system based on synchronous transmission reflection reconfigurable intelligent surface STAR-RIS, and the system comprises: base station 1 Cell 1, user c1， User, user e1， 、STAR-RIS 1 、STAR-RIS 2 Base station 2 Cell 2, user c2， And the user e2， ；
Said STAR-RIS 1 The method comprises the following steps: RIS 1 Controller and RIS 1 Panel, RIS 1 Controller controlling RIS 1 Panel, RIS 1 Number of RIS elements on panelL 1 Represents;
said STAR-RIS 2 The method comprises the following steps: RIS 2 Controller and RIS 2 Panel, RIS 2 Controller controlling RIS 2 Panel, RIS 2 Number of RIS elements on panelL 2 Represents;
user' s c1， Representing a central user in cell 1cUser of e1， Representing edge users in cell 1eUser of c2， Representing the central user in cell 2cUser of e2， Representing edge users within cell 2e；
Base station 1 Respectively with users c1， And the user e1， The channel between is an effective channel, the base station 2 Respectively with users c1， And the user e1， The channel in between is an interference channel, which passes through STAR-RIS 2 Respectively with users c1， And the user e1， The channel between is a transmission channel, and the effective channel passes through STAR-RIS 1 Respectively with users c1， And the user e1， The channel in between is a reflection channel;
the method specifically comprises the following steps:
step S1, sending effective channel gain, interference channel gain, reflection channel gain and transmission channel gain to RIS 1 Controller and RIS 2 Controller of RIS 1 Controller and RIS 2 The controller acquires all channel gain information;
step S2, suppose base station 1 User, user c1， User, user e1， Base station 2 User, user c2， And the user e2， All of which are single antennas, using non-orthogonal multiple access techniques c1， And the user e1， Sharing the same time, frequency and code domain resources, users c2， And the user e2， The same time domain, frequency domain and code domain resources are shared, and then the users c1， Received effective signal
Figure 907430DEST_PATH_IMAGE001
Expressed as:
Figure 896115DEST_PATH_IMAGE002
；
in the above-mentioned formula, the compound has the following structure,
Figure 179328DEST_PATH_IMAGE003
indicating a base station 1 To the user c1， Is subject to large-scale fading of the signal,
Figure 345999DEST_PATH_IMAGE004
indicating a base station 1 To the user c1， The small-scale fading of the signal is reduced,
Figure 347453DEST_PATH_IMAGE005
indicating a base station 1 The transmission power of the antenna is set to be,
Figure 874249DEST_PATH_IMAGE006
indicating a base station 1 -STAR-RIS 1 -user c1， The reflection of (a) is subject to large-scale fading,
Figure 277548DEST_PATH_IMAGE007
represents STAR-RIS 1 -user c1， Is reflected in a small-scale fading manner,
Figure 113655DEST_PATH_IMAGE008
represents STAR-RIS 1 The reflection matrix of (a) is,
Figure 336826DEST_PATH_IMAGE009
indicating a base station 1 To STAR-RIS 1 The small-scale fading matrix of (1);
user' s c1， Received interference signal
Figure 808259DEST_PATH_IMAGE010
Expressed as:
Figure 925119DEST_PATH_IMAGE011
；
in the above formula, the first and second carbon atoms are,
Figure 823805DEST_PATH_IMAGE012
indicating a base station 2 To the user c1， Is subject to large-scale fading of the signal,
Figure 409638DEST_PATH_IMAGE013
indicating a base station 2 To the user c1， The small-scale fading of the signal is reduced,
Figure 153604DEST_PATH_IMAGE014
indicating a base station 2 -STAR-RIS 2 -user c1， The large scale fading of the transmission of (a),
Figure 390550DEST_PATH_IMAGE015
indicating a base station 2 The transmission power of the antenna is set to be,
Figure 460137DEST_PATH_IMAGE016
represents STAR-RIS 2 -user c1， The transmission of (a) is small-scale fading,
Figure 34731DEST_PATH_IMAGE017
represents STAR-RIS 2 The transmission matrix of (a) is,
Figure 582387DEST_PATH_IMAGE018
indicating a base station 2 To STAR-RIS 2 The small-scale fading matrix of (1);
user c1， Received signal
Figure 673840DEST_PATH_IMAGE019
Expressed as:
Figure DEST_PATH_IMAGE020
；
in the above-mentioned formula, the compound has the following structure,
Figure 992957DEST_PATH_IMAGE021
is additive white gaussian noise;
step S3, according to the user c1， Interference signals received, using STAR-RIS 2 Suppression of user transmission signals c1， The received interference, and the corresponding interference suppression problem, is defined as:
Figure 412437DEST_PATH_IMAGE022
；
in the above formula, the first and second carbon atoms are,
Figure 622838DEST_PATH_IMAGE023
indicating a base station 2 To the user e1， Is subject to large-scale fading of the signal,
Figure 709743DEST_PATH_IMAGE024
indicating a base station 2 To the user e1， The small-scale fading of (a) a,
Figure 495034DEST_PATH_IMAGE025
indicating base stations 2 -STAR-RIS 2 -user e1， The large scale fading of the transmission of (a),
Figure 401810DEST_PATH_IMAGE026
represents STAR-RIS 2 -user e1， The transmission of (a) is small-scale fading,
Figure 681482DEST_PATH_IMAGE027
represents STAR-RIS 2 The coefficient of the transmission amplitude of (a),
Figure 622893DEST_PATH_IMAGE028
represents STAR-RIS 2 The transmission phase coefficient of (a);
where P1 and P2 are the central users in cell 1, respectivelycAnd edge userseThe transmission amplitude coefficient constraint (P1 a) describes STAR-RIS 2 The transmission phase coefficient constraint (P1 b) describes STAR-RIS 2 Assuming that the phase characteristic is continuously, ideally and controllably;
with the aim of eliminating the interference received by each user, and therefore the RIS 2 The controller first generates an interference matrix
Figure 80551DEST_PATH_IMAGE029
Comprises the following steps:
Figure 474623DEST_PATH_IMAGE030
；
to design STAR-RIS 2 Transmission amplitude coefficient and transmission phase coefficient of, it is necessary to generate STAR-RIS 2 Equivalent transmission matrix of
Figure 433352DEST_PATH_IMAGE031
The expression is as follows:
Figure 88324DEST_PATH_IMAGE032
；
wherein:
Figure 841516DEST_PATH_IMAGE033
indicating base stations 2 To the firstlThe small scale fading of the individual RIS elements,
Figure 117294DEST_PATH_IMAGE034
indicating base stations 2 -a first step oflIndividual RIS element-user c1， The gain of the transmission channel of (a),
Figure 879713DEST_PATH_IMAGE035
indicating a base station 2 -a first step oflIndividual RIS element-user e1， The transmission channel gain of (1);
to calculate STAR-RIS 2 The transmission matrix of (1), requires the generation of STAR-RIS 2 Transmission amplitude and transmission phase vector of
Figure 654771DEST_PATH_IMAGE036
The expression is as follows:
Figure 313286DEST_PATH_IMAGE037
；
so STAR-RIS 2 The transmission amplitude and transmission phase vector of (a) are designed to:
Figure 947529DEST_PATH_IMAGE038
；
step S4, after the interference received by the users in the cell 1 is suppressed, using STAR-RIS 1 The reflected signal of (2) enhances the effective signal received by the user in the cell 1, and the corresponding signal enhancement problem is defined as:
Figure 592268DEST_PATH_IMAGE039
where P3 is the center user in cell 1cThe reflection amplitude coefficient constraint (P3 a) describes STAR-RIS 1 The reflection phase coefficient constraint (P3 b) describes STAR-RIS 1 Assuming that the phase characteristic is continuously, ideally and controllably;
Figure 487412DEST_PATH_IMAGE040
represents STAR-RIS 1 The coefficient of the reflection amplitude of (a),
Figure 316828DEST_PATH_IMAGE041
represents STAR-RIS 1 The reflection phase coefficient of (2);
to strengthen the central users in cell 1cThe received valid signal is targeted and therefore on the RIS 1 The controller first generates an equivalent reflected channel
Figure 438368DEST_PATH_IMAGE042
The expression is as follows:
Figure 650912DEST_PATH_IMAGE043
wherein
Figure 10349DEST_PATH_IMAGE044
Indicating a base station 1 To the firstlThe small scale fading of the individual RIS elements,
Figure 666458DEST_PATH_IMAGE045
denotes the firstlFrom individual RIS element to user c1， Small scale fading of the reflection;
to maximize the effective signal received by the user, STAR-RIS in P3 1 Is designed as a reflection amplitude and a reflection phase vector
Figure 744136DEST_PATH_IMAGE046
The expression is as follows:
Figure 261836DEST_PATH_IMAGE047
；
wherein:
Figure 6938DEST_PATH_IMAGE048
taking a phase;
step S5, when STAR-RIS 1 And STAR-RIS 2 After completing the above P1, P2 and P3, what the user receivesInterference is suppressed and effective signal is increased, so based on this design, the center user in cell 1cThe received equivalent signal is
Figure 443736DEST_PATH_IMAGE049
The expression is as follows:
Figure 133343DEST_PATH_IMAGE050
。
2. the method as claimed in claim 1, wherein the method for enhancing and suppressing the synchronous transflective-based smart surface synchronization signal comprises
Figure 579368DEST_PATH_IMAGE051
And
Figure 24649DEST_PATH_IMAGE052
the expressions of (a) are respectively as follows:
Figure 897927DEST_PATH_IMAGE053
；
Figure 74831DEST_PATH_IMAGE054
；
wherein, the first and the second end of the pipe are connected with each other,
Figure 58967DEST_PATH_IMAGE051
and
Figure 513082DEST_PATH_IMAGE052
are respectively as
Figure 167049DEST_PATH_IMAGE055
And
Figure 972194DEST_PATH_IMAGE056
each element obeys the following rice distribution:
Figure 619076DEST_PATH_IMAGE057
；
Figure 927697DEST_PATH_IMAGE058
；
in the above formula, the first and second carbon atoms are,
Figure 142778DEST_PATH_IMAGE059
indicating a base station 1 To the firstlThe small scale fading of the individual RIS elements,
Figure 277962DEST_PATH_IMAGE060
denotes the firstlFrom individual RIS element to user c1， Is reflected by the light beam of (a) to a small scale fading,
Figure 603901DEST_PATH_IMAGE061
and
Figure 157242DEST_PATH_IMAGE062
is the light-weight linear light-emitting diode (LED),
Figure 277645DEST_PATH_IMAGE063
and
Figure 667169DEST_PATH_IMAGE064
in the case of the direct channel component,
Figure 531220DEST_PATH_IMAGE065
and
Figure 814434DEST_PATH_IMAGE066
is the NLoS component.
3. The smart watch based on synchronous transreflection as claimed in claim 1Method for plane synchronous signal enhancement and interference suppression, characterized in that
Figure 495951DEST_PATH_IMAGE067
Expressed as:
Figure 497405DEST_PATH_IMAGE068
wherein
Figure 536118DEST_PATH_IMAGE069
Indicating base stations 1 To the user c1， The distance of (a) to (b),
Figure 408259DEST_PATH_IMAGE070
indicating a base station 1 To the user c1， The path attenuation coefficient of (1), said
Figure 401623DEST_PATH_IMAGE071
Expressed as:
Figure 749428DEST_PATH_IMAGE072
wherein
Figure 955281DEST_PATH_IMAGE073
And
Figure 88453DEST_PATH_IMAGE074
respectively represent base stations 1 To STAR-RIS 1 Distance and STAR-RIS 1 To the user c1， The distance of (a) to (b),
Figure 987139DEST_PATH_IMAGE075
indicating a base station 1 To STAR-RIS 1 The coefficient of the path attenuation of (a),
Figure 556661DEST_PATH_IMAGE076
represents STAR-RIS 1 To the user c1， Path attenuation coefficient of (2) or STAR-RIS 2 To the user c1， A path attenuation coefficient of (2), said
Figure 566205DEST_PATH_IMAGE077
And
Figure 944097DEST_PATH_IMAGE078
are respectively represented as
Figure 122006DEST_PATH_IMAGE079
And
Figure 319769DEST_PATH_IMAGE080
in which
Figure 257638DEST_PATH_IMAGE081
Indicating a base station 2 To STAR-RIS 2 The distance of (a) to (b),
Figure 224457DEST_PATH_IMAGE082
represents STAR-RIS 1 To the user e1， The distance of (a) to (b),
Figure 74733DEST_PATH_IMAGE083
represents STAR-RIS 1 To the user e1， Path attenuation coefficient of (2) or STAR-RIS 2 To the user e1， A path attenuation coefficient of (2), said
Figure 25371DEST_PATH_IMAGE084
Expressed as:
Figure 376718DEST_PATH_IMAGE085
in which
Figure 322677DEST_PATH_IMAGE086
Indicating a base station 2 To the user c1， The distance of (a) to (b),
Figure 999646DEST_PATH_IMAGE087
indicating a base station 2 To the user c1， A path attenuation coefficient of (2), said
Figure 283253DEST_PATH_IMAGE088
Expressed as:
Figure 172712DEST_PATH_IMAGE089
wherein
Figure 379703DEST_PATH_IMAGE090
Indicating base stations 2 To the user e1， The distance of (c).
4. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program; the computer program, when executed by a processor, implements the synchronous transflective intelligent surface synchronization signal enhancement and interference suppression method according to any one of claims 1 to 3.
5. A computer device comprising a memory and a processor, wherein a computer program is stored in the memory; the computer program, when executed by a processor, implements the synchronous transflective intelligent surface synchronization signal enhancement and interference suppression based method according to any one of claims 1 to 3.
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