CN113783812A - Synchronous transmission reflection based intelligent surface synchronous signal enhancement and interference suppression method - Google Patents

Synchronous transmission reflection based intelligent surface synchronous signal enhancement and interference suppression method Download PDF

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CN113783812A
CN113783812A CN202110816896.0A CN202110816896A CN113783812A CN 113783812 A CN113783812 A CN 113783812A CN 202110816896 A CN202110816896 A CN 202110816896A CN 113783812 A CN113783812 A CN 113783812A
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CN113783812B (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 a synchronous transmission reflection-based intelligent surface synchronizing signal enhancement and interference suppression method, in a cellular network, according to channel information from a base station 2 to a user 1, c, STAR-RIS2Estimating the interference strength received by the user 1, c; from base station 2 and STAR-RIS2And STAR-RIS2And the channels of users 1, c, with STAR-RIS, targeted at the minimization of the interference received by the users2The transmission amplitude coefficient and the transmission phase coefficient are constraint conditions, and STAR-RIS is determined2The interference suppression method of (1). In determining STAR-RIS2After 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 used1The reflection amplitude coefficient, the reflection phase coefficient and the total energy are taken as constraint conditions to determine STAR-RIS1The signal enhancement method of (1).

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 received signal strength can be effectively enhanced or weakened, and the performance of a wireless communication system is improved. However, the RIS-based communication approach is a key challenging problem, generally focusing only on signal enhancement or interference suppression issues, and cannot synchronize signal enhancement and interference suppression.
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 reflect in the half-space on the same side as STAR-RIS, while an incident wireless signal can also transmit into the half-space on the other side of STAR-RIS. Therefore, 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 intelligent surface (STAR-RIS) based wireless communication system comprising: base station1Cell 1, user1，cUser, user1，e、STAR-RIS1、STAR-RIS2Base station2Cell 2, user2，cAnd the user2，e；
Said STAR-RIS1The method comprises the following steps: RIS1Controller and RIS1Panel, RIS1Controller controlling RIS1Panel, RIS1Number of RIS elements on panel is L1Represents;
said STAR-RIS2The method comprises the following steps: RIS2Controller and RIS2Panel, RIS2Controller controlling RIS2Panel, RIS2Number of RIS elements on panel is L2Represents;
user' s1，cRepresents a central user c, user within cell 11，eIndicating edge user e, user within cell 12，cRepresents a central user c, user within cell 22，eRepresents an edge user e within cell 2;
base station1And the user1，cAnd the user1，eThe channel between is an effective channel, the base station2And the user1，cAnd the user1，eThe channel in between is an interference channel, which passes through STAR-RIS2And the user1，cAnd the user1，eThe channel between is a transmission channel, and the effective channel passes through STAR-RIS1And the user1，cAnd the user1，eThe channel in between is a reflection channel.
Based on the above protocol, the STAR-RIS1Transmission matrix phi1,TAnd reflection matrix phi1,RThe expressions of (a) are respectively as follows:
Figure BDA0003170455860000031
Figure BDA0003170455860000032
wherein, beta1,T,l∈(0,1],l＝1,2,…L1And beta1,R,l∈(0,1],l＝1,2,…L1Respectively represent STAR-RIS1And satisfies the transmission amplitude coefficient and the reflection amplitude coefficient
Figure BDA0003170455860000033
STAR-RIS1Transmission phase coefficient phi of1,T,lAnd a reflection phase coefficient phi1,R,lThe expressions of (a) are respectively as follows:
Figure BDA0003170455860000034
Figure BDA0003170455860000035
in the above formula, j represents an imaginary number, θ1,T,lRepresents STAR-RIS1Transmission phase of (e), theta1,R,lRepresents STAR-RIS1The reflection phase of (1).
Based on the above protocol, the STAR-RIS2Transmission matrix phi2,TAnd reflection matrix phi2,RThe expressions of (a) are respectively as follows:
Figure BDA0003170455860000036
Figure BDA0003170455860000037
wherein, beta2,T,l∈(0,1],l＝1,2,…L2And beta2,R,l∈(0,1],l＝1,2,…L2Respectively represent STAR-RIS2And satisfies the transmission amplitude coefficient and the reflection amplitude coefficient
Figure BDA0003170455860000038
STAR-RIS2Transmission phase coefficient phi of2,T,lAnd a reflection phase coefficient phi2,R,lThe expressions of (a) are respectively as follows:
Figure BDA0003170455860000039
Figure BDA00031704558600000310
in the above formula, j represents an imaginary number, θ2,T,lRepresents STAR-RIS2Transmission phase of (e), theta2,R,lRepresents STAR-RIS2The 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 RIS1Controller and RIS2Controller of RIS1Controller and RIS2The controller acquires all channel gain information;
step S2, assume base station1User, user1，cUser, user1，eBase station2User, user1，cAnd the user1，eAll of which are single antennas, using non-orthogonal multiple access techniques1，cAnd the user1，eSharing the same time, frequency and code domain resources, users2，cAnd the user2，eThe same time domain, frequency domain and code domain resources are shared, and then the users1，cReceived valid signal y1,c,uExpressed as:
Figure BDA0003170455860000041
in the above formula, ∈1,1,cIndicating a base station1To the user1，cLarge scale fading, w1,1,cRepresenting base station 1 to user1，cSmall scale fading, p1Indicating a base station1Of the transmission power of epsilon1,R,cRepresenting base station 1-STAR-RIS1-user1，cReflection of large scale fading, R1,1,cRepresents STAR-RIS1-user1，cReflection of small scale fading, phi1,RRepresents STAR-RIS1Reflection matrix of H1Indicating a base station1To STAR-RIS1The small-scale fading matrix of (1);
user' s1，cReceived interference signal y1,c,iExpressed as:
Figure BDA0003170455860000042
in the above formula, ∈2,1,cIndicating a base station2To the user1，cLarge scale fading, w2,1,cIndicating a base station2To the user1，cSmall scale fading of epsilon2,T,cIndicating a base station2-STAR-RIS2-user1，cTransmission of large scale fading, p2Indicating a base station2Transmit power of, T2,1,cRepresents STAR-RIS2-user1，cTransmission of small scale fading, phi2,TRepresents STAR-RIS2Transmission matrix of H2Indicating a base station2To STAR-RIS2The small-scale fading matrix of (1);
user' s1，cReceived signal y1,cExpressed as:
Figure BDA0003170455860000051
in the above formula, N0Is additive white gaussian noise;
step S3, according to the user1，cInterference signals received, using STAR-RIS2Suppression of user transmission signals1，cThe received interference, and the corresponding interference suppression problem, can be defined as:
Figure BDA0003170455860000052
Figure BDA0003170455860000053
Figure BDA0003170455860000054
Figure BDA0003170455860000055
in the above formula, ∈2,1,eIndicating a base station2To the user1，eLarge scale fading, w2,1,eIndicating a base station2To the user1，eSmall scale fading of epsilon2,T,eIndicating a base station2-STAR-RIS2-user1，eTransmission large scale fading, T2,1,eRepresents STAR-RIS2-user1，eTransmission of small scale fading, beta2,T,lRepresents STAR-RIS2Coefficient of transmission amplitude phi2,T,lRepresents STAR-RIS2The transmission phase coefficient of (a);
where P1 and P2 are optimization problems for center user c and edge user e, respectively, within cell 1, the transmission amplitude coefficient constraint (P1a) describes STAR-RIS2The transmission phase coefficient constraint (P1b) describes STAR-RIS2In 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 RIS2The controller first generates an interference matrix I2,1Comprises the following steps:
Figure BDA0003170455860000061
to design STAR-RIS2Transmission amplitude coefficient and transmission phase coefficient of, it is necessary to generate STAR-RIS2Equivalent transmission matrix of
Figure BDA0003170455860000062
The expression is as follows:
Figure BDA0003170455860000063
wherein: h is2,R,l,l＝1,2,…,L2Indicating a base station2Small scale fading to the l-th RIS element, t2,1,c,l,l＝1,2,…,L2Indicating a base station2First RIS element user1，cTransmission channel gain of t2,1,e,l,l＝1,2,…,L2Indicating a base station2First RIS element user1，eThe transmission channel gain of (1);
to calculate STAR-RIS2Transmission matrix of, requires the generation of STAR-RIS2Transmission amplitude and transmission phase vector of
Figure BDA0003170455860000064
The expression is as follows:
Figure BDA0003170455860000065
thus STAR-RIS2The transmission amplitude and transmission phase vector of (a) are designed to:
Figure BDA0003170455860000066
step S4, when the interference received by the user in cell 1 is suppressed, STAR-RIS is used1The 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 (P3a) describes STAR-RIS1The reflection phase coefficient constraint (P3b) describes STAR-RIS1Phase characteristics ofIn 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 RIS1The 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 P31Is 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-RIS1And STAR-RIS2After the above P1, P2 and P3 are completed, the interference received by the users 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 y1,cThe expression is as follows:
Figure BDA0003170455860000075
on the basis of the scheme, the H1And R1,1,cThe expressions of (a) are respectively as follows:
Figure BDA0003170455860000076
Figure BDA0003170455860000077
wherein H1And R1,1,cAre respectively L1X 1 and 1X L1Each element obeys the following rice distribution:
Figure BDA0003170455860000078
Figure BDA0003170455860000079
in the above formula, h1,R,lIndicating a base station1Small scale fading to the l-th RIS element, r1,c,lRepresenting the l-th RIS element to the user1，cIs 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 epsilon1,1,cExpressed as:
Figure BDA0003170455860000087
wherein d is1,1,cIndicating a base station1To the user1，cA distance of1Indicating a base station1To the user1，cThe path attenuation coefficient of (e), the epsilon1,R,cExpressed as:
Figure BDA0003170455860000088
wherein d is1,RAnd dR,1,cRespectively represent base stations1To STAR-RIS1Distance and STAR-RIS1To the user1，cA distance of2Indicating a base station1To STAR-RIS1A path attenuation coefficient of3,cRepresents STAR-RIS1To the user1，cPath attenuation coefficient of (2) or STAR-RIS2To the user1，cThe path attenuation coefficient of (e), the epsilon2,T,cAnd ε2,T,eAre respectively represented as
Figure BDA0003170455860000089
And
Figure BDA00031704558600000810
wherein d is2,RIndicating a base station2To STAR-RIS2Distance of dR,1,eRepresents STAR-RIS1To the user1，eA distance of3,eRepresents STAR-RIS1To the user1，ePath attenuation coefficient of (2) or STAR-RIS2To the user1，eThe path attenuation coefficient of (e), the epsilon2,1,cExpressed as:
Figure BDA00031704558600000811
wherein d is2,1,cIndicating a base station2To the user1，cA distance of4Indicating a base station2To the user1，cThe path attenuation coefficient of (e), the epsilon2,1,eExpressed as:
Figure BDA00031704558600000812
wherein d is2,1,eIndicating a base station2To the user1，eThe 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 figures 1-3.
In the embodiment of the invention, synchronization signal enhancement and interference suppression of a cellular network are carried out through STAR-RIS, and the proposed method is utilized to remarkably improve the interruption 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 station1Cell 1, user1，cUser, user1，e、STAR-RIS1、STAR-RIS2 Cell 2, user2，cUser, user2，eAnd base station2；
Said STAR-RIS1The method comprises the following steps: RIS1Controller and RIS1Panel, RIS1Controller controlling RIS1Panel, RIS1Number of RIS elements on panel is L1Represents;
said STAR-RIS2The method comprises the following steps: RIS2Controller and RIS2Panel, RIS2Controller controlling RIS2Panel, RIS2Number of RIS elements on panel is L2Represents;
user' s1，cRepresents a central user c, user within cell 11，eIndicating edge user e, user within cell 12，cRepresents a central user c, user within cell 22，eRepresents an edge user e within cell 2;
base station1And the user1，cAnd the user1，eThe channel between is an effective channel, the base station2And the user1，cAnd the user1，eThe channel in between is an interference channel, which passes through STAR-RIS2And the user1，cAnd the user1，eThe channel between is a transmission channel, and the effective channel passes through STAR-RIS1And the user1，cAnd the user1，eThe channel in between is a reflection channel.
Based on the above protocol, the STAR-RIS1Transmission matrix phi1,TAnd reflection matrix phi1,RThe expressions of (a) are respectively as follows:
Figure BDA0003170455860000101
Figure BDA0003170455860000102
wherein, beta1,T,l∈(0,1],l＝1,2,…L1And beta1,R,l∈(0,1],l＝1,2,…L1Respectively represent STAR-RIS1And satisfies the transmission amplitude coefficient and the reflection amplitude coefficient
Figure BDA0003170455860000103
STAR-RIS1Transmission phase coefficient phi of1,T,lAnd a reflection phase coefficient phi1,R,lThe expressions of (a) are respectively as follows:
Figure BDA0003170455860000104
Figure BDA0003170455860000105
in the above formula, j represents an imaginary number, θ1,T,lRepresents STAR-RIS1Transmission phase of (e), theta1,R,lRepresents STAR-RIS1The reflection phase of (1).
Based on the above protocol, the STAR-RIS2Transmission matrix phi2,TAnd reflection matrix phi2,RThe expressions of (a) are respectively as follows:
Figure BDA0003170455860000106
Figure BDA0003170455860000107
wherein, beta2,T,l∈(0,1],l＝1,2,…L2And beta2,R,l∈(0,1],l＝1,2,…L2Respectively represent STAR-RIS2And satisfies the transmission amplitude coefficient and the reflection amplitude coefficient
Figure BDA0003170455860000111
STAR-RIS2Transmission phase coefficient phi of2,T,lAnd a reflection phase coefficient phi2,R,lThe expressions of (a) are respectively as follows:
Figure BDA0003170455860000112
Figure BDA0003170455860000113
in the above formula, j represents an imaginary number, θ2,T,lRepresents STAR-RIS2Transmission phase of (e), theta2,R,lRepresents STAR-RIS2The 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, effective channelThe gain, interference channel gain, reflection channel gain and transmission channel gain are all sent to the RIS1Controller and RIS2Controller of RIS1Controller and RIS2The controller acquires all channel gain information;
suppose a base station1User, user1，cUser, user1，eBase station2User, user1，cAnd the user1，eAll of which are single antennas, using non-orthogonal multiple access techniques1，cAnd the user1，eSharing the same time, frequency and code domain resources, users2，cAnd the user2，eThe same time domain, frequency domain and code domain resources are shared, and then the users1，cReceived valid signal y1,c,uExpressed as:
Figure BDA0003170455860000114
in the above formula, ∈1,1,cIndicating a base station1To the user1，cLarge scale fading, w1,1,cIndicating a base station1To the user1，cSmall scale fading, p1Indicating a base station1Of the transmission power of epsilon1,R,cIndicating a base station1-STAR-RIS1-user1，cReflection of large scale fading, R1,1,cRepresents STAR-RIS1-user1，cReflection of small scale fading, phi1,RRepresents STAR-RIS1Reflection matrix of H1Indicating a base station1To STAR-RIS1The small-scale fading matrix of (1);
user' s1，cReceived interference signal y1,c,iExpressed as:
Figure BDA0003170455860000121
in the above formula, ∈2,1,cIndicating a base station2To the user1，cLarge scale fading, w2,1,cIndicating a base station2To the user1，cSmall scale fading of epsilon2,T,cIndicating a base station2-STAR-RIS2-user1，cTransmission of large scale fading, p2Indicating a base station2Transmit power of, T2,1,cRepresents STAR-RIS2-user1，cTransmission of small scale fading, phi2,TRepresents STAR-RIS2Transmission matrix of H2Indicating a base station2To STAR-RIS2The small-scale fading matrix of (1);
user' s1，cReceived signal y1,cExpressed as:
Figure BDA0003170455860000122
in the above formula, N0Is additive white gaussian noise;
step S120, according to the user1，cInterference signals received, using STAR-RIS2Suppression of user transmission signals1，cThe 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,eIndicating a base station2To the user1，eLarge scale fading, w2,1,eIndicating a base station2To the user1，eSmall scale fading of epsilon2,T,eIndicating a base station2-STAR-RIS2-user1，eTransmission large scale fading, T2,1,eRepresents STAR-RIS2-user1，eTransmission of small scale fading, beta2,T,lRepresents STAR-RIS2Coefficient of transmission amplitude phi2,T,lRepresents STAR-RIS2The transmission phase coefficient of (a);
where P1 and P2 are optimization problems for center user c and edge user e, respectively, within cell 1, the transmission amplitude coefficient constraint (P1a) describes STAR-RIS2The transmission phase coefficient constraint (P1b) describes STAR-RIS2In 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 RIS2The controller first generates an interference matrix I2,1Comprises the following steps:
Figure BDA0003170455860000131
to design STAR-RIS2Transmission amplitude coefficient and transmission phase coefficient of, it is necessary to generate STAR-RIS2Equivalent transmission matrix of
Figure BDA0003170455860000132
The expression is as follows:
Figure BDA0003170455860000133
wherein: h is2,R,l,l＝1,2,…,L2Indicating a base station2Small scale fading to the l-th RIS element,
t2,1,c,l,l＝1,2,…,L2indicating a base station2First RIS element user1，cTransmission channel gain of t2,1,e,l,l＝1,2,…,L2Indicating a base station2First RIS element user1，eThe transmission channel gain of (1);
to calculate STAR-RIS2Of the transmission matrixNeed to generate STAR-RIS2Transmission amplitude and transmission phase vector of
Figure BDA0003170455860000134
The expression is as follows:
Figure BDA0003170455860000135
thus STAR-RIS2The 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-RIS1The 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 BDA0003170455860000142
Figure BDA0003170455860000143
Figure BDA0003170455860000144
where P3 is the optimization problem for central user c in cell 1, the reflection amplitude coefficient constraint (P3a) describes STAR-RIS1The reflection phase coefficient constraint (P3b) describes STAR-RIS1In 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 RIS1The 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 P31Is 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-RIS1And STAR-RIS2After the above P1, P2 and P3 are completed, the interference received by the users is suppressed, so based on this design, the equivalent signal received by the center user c in the cell 1 is y1,cThe expression is as follows:
Figure BDA0003170455860000149
on the basis of the scheme, the H1And R1,1,cThe expressions of (a) are respectively as follows:
Figure BDA0003170455860000151
Figure BDA0003170455860000152
wherein H1And R1,1,cAre respectively L1X 1 and 1X L1Each element obeys the following rice distribution:
Figure BDA0003170455860000153
Figure BDA0003170455860000154
in the above formula, h1,R,lIndicating a base station1Small scale fading to the l-th RIS element, r1,c,lRepresenting the l-th RIS element to the user1，cIs reflected in a small-scale fading manner,
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 epsilon1,1,cExpressed as:
Figure BDA00031704558600001511
wherein d is1,1,cIndicating a base station1To the user1，cA distance of1Indicating a base station1To the user1，cThe path attenuation coefficient of (e), the epsilon1,R,cExpressed as:
Figure BDA00031704558600001512
wherein d is1,RAnd dR,1,cRespectively represent base stations1To STAR-RIS1Distance and STAR-RIS1To the user1，cA distance of2Indicating a base station1To STAR-RIS1A path attenuation coefficient of3,cRepresents STAR-RIS1To the user1，cPath attenuation coefficient of (2) or STAR-RIS2To the user1，cThe path attenuation coefficient of (e), the epsilon2,T,cAnd ε2,T,eAre respectively represented as
Figure BDA00031704558600001513
And
Figure BDA00031704558600001514
wherein d is2,RIndicating a base station2To STAR-RIS2Distance of dR,1,eRepresents STAR-RIS1To the user1，eA distance of3,eRepresents STAR-RIS1To the user1，ePath attenuation coefficient of (2) or STAR-RIS2To the user1，eThe path attenuation coefficient of (e), the epsilon2,1,cExpressed as:
Figure BDA00031704558600001515
wherein d is2,1,cIndicating a base station2To the user1，cA distance of4Indicating a base station2To the user1，cThe path attenuation coefficient of (e), the epsilon2,1,eExpressed as:
Figure BDA0003170455860000161
wherein d is2,1,eIndicating a base station2To the user1，eThe distance of (c).
Scene settings are shown in fig. 2, and simulation parameters are shown in table 1.
TABLE 1 parameter settings
Base station1Distance of the central user c 30 m
Base station1Distance of edge user e 60 m
Base station1To STAR-RIS1Is a distance of 70 m
STAR-RIS1Distance to edge user e 15 m
STAR-RIS1Distance to the central user c 50 m
Base station2Distance to the central user c 120 m
Base station2Distance to edge user e 90 m
Base station1Path fading coefficient to center user c α1＝3
Base station1To STAR-RIS1Is determined by the path fading coefficient α2＝2.8
STAR-RIS1Path fading coefficient to edge user e α3,e＝2.5
STAR-RIS1Path fading coefficient to center user c α3,c＝2.8
Base station2Path fading coefficient to user α4＝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 within the skill of the art.

Claims (8)

1. A wireless communication system based on a synchronous transmission reflection reconfigurable intelligent surface, comprising: base station1Cell 1, user1，cUser, user1，e、STAR-RIS1、STAR-RIS2Base station2Cell 2, user2，cAnd the user2，e；
Said STAR-RIS1The method comprises the following steps: RIS1Controller and RIS1Panel, RIS1Controller controlling RIS1Panel, RIS1Number of RIS elements on panel is L1Represents;
said STAR-RIS2The method comprises the following steps: RIS2Controller and RIS2Panel, RIS2Controller controlling RIS2Panel, RIS2Number of RIS elements on panel is L2Represents;
user' s1，cRepresents a central user c, user within cell 11，eIndicating edge user e, user within cell 12，cRepresents a central user c, user within cell 22，eRepresents an edge user e within cell 2;
base station1And the user1，cAnd the user1，eThe channel between is an effective channel, the base station2And the user1，cAnd the user1，eThe channel in between is an interference channel, which passes through STAR-RIS2And the user1，cAnd the user1，eThe channel between is a transmission channel, and the effective channel passes through STAR-RIS1And the user1，cAnd the user1，eThe channel in between is a reflection channel.
2. The synchronous transflective reconfigurable smart surface-based wireless communication system according to claim 1, wherein the STAR-RIS system1Transmission matrix phi1,TAnd reflection matrix phi1,RThe expressions of (a) are respectively as follows:
Figure FDA0003170455850000011
Figure FDA0003170455850000012
wherein, beta1,T,l∈(0,1],l＝1,2,…L1And beta1,R,l∈(0,1],l＝1,2,…L1Respectively represent STAR-RIS1And satisfies the transmission amplitude coefficient and the reflection amplitude coefficient
Figure FDA0003170455850000013
STAR-RIS1Transmission phase coefficient phi of1,T,lAnd a reflection phase coefficient phi1,R,lThe expressions of (a) are respectively as follows:
Figure FDA0003170455850000021
Figure FDA0003170455850000022
in the above formula, j represents an imaginary number, θ1,T,lRepresents STAR-RIS1Transmission phase of (e), theta1,R,lRepresents STAR-RIS1The reflection phase of (1).
3. The synchronous transflective reconfigurable smart surface-based wireless communication system according to claim 1, wherein the STAR-RIS system2Transmission matrix phi2,TAnd reflection matrix phi2,RThe expressions of (a) are respectively as follows:
Figure FDA0003170455850000023
Figure FDA0003170455850000024
wherein, beta2,T,l∈(0,1],l＝1,2,…L2And beta2,R,l∈(0,1],l＝1,2,…L2Respectively represent STAR-RIS2And satisfies the transmission amplitude coefficient and the reflection amplitude coefficient
Figure FDA0003170455850000025
STAR-RIS2Transmission phase coefficient phi of2,T,lAnd a reflection phase coefficient phi2,R,lThe expressions of (a) are respectively as follows:
Figure FDA0003170455850000026
Figure FDA0003170455850000027
in the above formula, j represents an imaginary number, θ2,T,lRepresents STAR-RIS2Transmission phase of (e), theta2,R,lRepresents STAR-RIS2The reflection phase of (1).
4. An intelligent surface synchronization signal enhancement and interference suppression method based on synchronous transmission reflection, which is applied to the wireless communication system of any one of claims 1 to 3, and is characterized by comprising the following steps:
step S1, sending effective channel gain, interference channel gain, reflection channel gain and transmission channel gain to RIS1Controller and RIS2Controller of RIS1Controller and RIS2The controller acquires all channel gain information;
step S2, assume base station1User, user1，cUser, user1，eBase station2User, user1，cAnd the user1，eAll of which are single antennas, using non-orthogonal multiple access techniques1，cAnd the user1，eSharing the same time, frequency and code domain resources, users2，cAnd the user2，eThe same time domain, frequency domain and code domain resources are shared, and then the users1，cReceived valid signal y1,c,uExpressed as:
Figure FDA0003170455850000031
in the above formula, ∈1,1,cIndicating a base station1To the user1，cLarge scale fading, w1,1,cIndicating a base station1To the user1，cSmall scale fading, p1Indicating a base station1Of the transmission power of epsilon1,R,cIndicating a base station1-STAR-RIS1-user1，cReflection of large scale fading, R1,1,cRepresents STAR-RIS1-user1，cReflection of small scale fading, phi1,RRepresents STAR-RIS1Reflection matrix of H1Indicating a base station1To STAR-RIS1The small-scale fading matrix of (1);
user' s1，cReceived interference signal y1,c,iExpressed as:
Figure FDA0003170455850000032
in the above formula, ∈2,1,cIndicating a base station2To the user1，cLarge scale fading, w2,1,cIndicating a base station2To the user1，cSmall scale fading of epsilon2,T,cIndicating a base station2-STAR-RIS2-user1，cTransmission of large scale fading, p2Indicating a base station2Transmit power of, T2,1,cRepresents STAR-RIS2-user1，cTransmission of small scale fading, phi2,TRepresents STAR-RIS2Transmission moment ofArray, H2Indicating a base station2To STAR-RIS2The small-scale fading matrix of (1);
user' s1，cReceived signal y1,cExpressed as:
Figure FDA0003170455850000041
in the above formula, N0Is additive white gaussian noise;
step S3, according to the user1，cInterference signals received, using STAR-RIS2Suppression of user transmission signals1，cThe received interference, and the corresponding interference suppression problem, is defined as:
P1:
Figure FDA0003170455850000042
P2:
Figure FDA0003170455850000043
Figure FDA0003170455850000044
Figure FDA0003170455850000045
in the above formula, ∈2,1,eIndicating a base station2To the user1，eLarge scale fading, w2,1,eIndicating a base station2To the user1，eSmall scale fading of epsilon2,T,eIndicating a base station2-STAR-RIS2-user1，eTransmission large scale fading, T2,1,eRepresents STAR-RIS2-user1，eTransmission of small scale fading, beta2,T,lRepresents STAR-RIS2Coefficient of transmission amplitude phi2,T,lRepresents STAR-RIS2Is of a transmission phase systemCounting;
where P1 and P2 are optimization problems for center user c and edge user e, respectively, within cell 1, the transmission amplitude coefficient constraint (P1a) describes STAR-RIS2The transmission phase coefficient constraint (P1b) describes STAR-RIS2In 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 RIS2The controller first generates an interference matrix I2,1Comprises the following steps:
Figure FDA0003170455850000046
to design STAR-RIS2Transmission amplitude coefficient and transmission phase coefficient of, it is necessary to generate STAR-RIS2Equivalent transmission matrix of
Figure FDA0003170455850000051
The expression is as follows:
Figure FDA0003170455850000052
wherein: h is2,R,l,l＝1,2,…,L2Indicating a base station2Small scale fading to the l-th RIS element, t2,1,c,l,l＝1,2,…,L2Indicating a base station2First RIS element user1，cTransmission channel gain of t2,1,e,l,l＝1,2,…,L2Indicating a base station2First RIS element user1，eThe transmission channel gain of (1);
to calculate STAR-RIS2Transmission matrix of, requires the generation of STAR-RIS2Transmission amplitude and transmission phase vector of
Figure FDA0003170455850000053
The expression is as follows:
Figure FDA0003170455850000054
thus STAR-RIS2The transmission amplitude and transmission phase vector of (a) are designed to:
Figure FDA0003170455850000055
step S4, when the interference received by the user in cell 1 is suppressed, STAR-RIS is used1The 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:
P3
Figure FDA0003170455850000056
Figure FDA0003170455850000057
Figure FDA0003170455850000058
where P3 is the optimization problem for central user c in cell 1, the reflection amplitude coefficient constraint (P3a) describes STAR-RIS1The reflection phase coefficient constraint (P3b) describes STAR-RIS1In 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 RIS1The controller first generates an equivalent reflected channel
Figure FDA0003170455850000059
The expression is as follows:
Figure FDA00031704558500000510
to maximize the effective signal received by the user, STAR-RIS in P31Is designed as a reflection amplitude and a reflection phase vector
Figure FDA0003170455850000061
The expression is as follows:
Figure FDA0003170455850000062
wherein: arg is phase;
step S5, when STAR-RIS1And STAR-RIS2After the above P1, P2 and P3 are completed, the interference received by the users 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 y1,cThe expression is as follows:
Figure FDA0003170455850000063
5. the synchronous transflectance-based intelligent surface synchronization signal enhancement and interference suppression method according to claim 4, wherein the H is1And R1,1,cThe expressions of (a) are respectively as follows:
Figure FDA0003170455850000064
Figure FDA0003170455850000065
wherein H1And R1,1,cAre respectively L1X 1 and 1X L1Each element obeys the following rice distribution:
Figure FDA0003170455850000066
Figure FDA0003170455850000067
in the above formula, h1,R,lIndicating a base station1Small scale fading to the l-th RIS element, r1,c,lRepresenting the l-th RIS element to the user1，cIs reflected in a small-scale fading manner,
Figure FDA0003170455850000068
and
Figure FDA0003170455850000069
is the light-weight linear light-emitting diode (LED),
Figure FDA00031704558500000610
and
Figure FDA00031704558500000611
in the case of the direct channel component,
Figure FDA00031704558500000612
and
Figure FDA00031704558500000613
is the NLoS component.
6. The synchronous transflectance-based intelligent surface synchronization signal enhancement and interference suppression method as claimed in claim 4, wherein ε1,1,cExpressed as:
Figure FDA0003170455850000071
wherein d is1,1,cIndicating a base station1To the user1，cA distance of1Indicating a base station1To the user1，cThe path attenuation coefficient of (e), the epsilon1,R,cExpressed as:
Figure FDA0003170455850000072
wherein d is1,RAnd dR,1,cRespectively represent base stations1To STAR-RIS1Distance and STAR-RIS1To the user1，cA distance of2Indicating a base station1To STAR-RIS1A path attenuation coefficient of3,cRepresents STAR-RIS1To the user1，cPath attenuation coefficient of (2) or STAR-RIS2To the user1，cThe path attenuation coefficient of (e), the epsilon2,T,cAnd ε2,T,eAre respectively represented as
Figure FDA0003170455850000073
And
Figure FDA0003170455850000074
wherein d is2,RIndicating a base station2To STAR-RIS2Distance of dR,1,eRepresents STAR-RIS1To the user1，eA distance of3,eRepresents STAR-RIS1To the user1，ePath attenuation coefficient of (2) or STAR-RIS2To the user1，eThe path attenuation coefficient of (e), the epsilon2,1,cExpressed as:
Figure FDA0003170455850000075
wherein d is2,1,cIndicating a base station2To the user1，cA distance of4Indicating a base station2To the user1，cThe path attenuation coefficient of (e), the epsilon2,1,eExpressed as:
Figure FDA0003170455850000076
wherein d is2,1,eIndicating a base station2To the user1，eThe distance of (c).
7. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program; the computer program, when executed, implements the synchronous transflective intelligent surface synchronization signal enhancement and interference suppression based method according to any one of claims 4 to 6.
8. A computer program product, characterized in that the computer program product comprises a computer program; the computer program, when executed, implements the synchronous transflective intelligent surface synchronization signal enhancement and interference suppression based method according to any one of claims 4 to 6.
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