CN115801078A - Multi-time scale intelligent super-surface configuration method adaptive to transmission scheme - Google Patents
Multi-time scale intelligent super-surface configuration method adaptive to transmission scheme Download PDFInfo
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Abstract
The invention discloses a multi-time scale intelligent super-surface configuration method adapting to a transmission scheme, which comprises the following steps: the base station determines the adopted wireless transmission scheme according to the wireless transmission performance requirement; aiming at the adopted wireless transmission scheme, the base station analyzes the channel characteristics suitable for the wireless transmission scheme; according to the required channel characteristics, the base station analyzes and determines an intelligent super-surface configuration method for realizing the channel characteristics and the required channel state information; the base station carries out channel estimation to obtain channel state information required by the intelligent super-surface configuration method; the base station configures an intelligent super surface on a corresponding time scale by using the obtained channel state information to form a channel suitable for the adopted wireless transmission scheme; the base station and the user terminal transmit data according to a wireless transmission scheme adopted by the channel design formed by intelligent super-surface configuration.
Description
Technical Field
The invention provides a multi-time scale intelligent super-surface configuration method adaptive to a transmission scheme, and belongs to the technical field of wireless communication.
Background
The MIMO (multiple-input multiple-output) technology is one of the key technologies in the field of wireless communication, and can achieve different wireless transmission performance improvements under different transmission scheme designs. For example, the wireless transmission rate is increased by a spatial multiplexing transmission scheme, and the wireless transmission reliability is enhanced by a spatial diversity transmission scheme. In general, the performance of a transmission scheme depends on the characteristics of the channel. In a conventional wireless communication system, a channel is regarded as an uncontrollable factor. Therefore, the transmission scheme can be only passively adaptively designed according to the change of the channel, which greatly limits the design of the transmission scheme. The advent of intelligent metasurfaces with the ability to change the spatial electromagnetic wave makes it possible to modulate the channel.
The intelligent meta-surface is a two-dimensional electromagnetic plane composed of adjustable meta-material units. By controlling the adjustable metamaterial unit, the intelligent super-surface can change the properties of the amplitude, the phase, the frequency, the polarization direction and the like of incident electromagnetic waves. The introduction of intelligent super surfaces into wireless communication systems will extend traditional two-node (i.e., transmitter and receiver) wireless communications to three-node (i.e., transmitter, intelligent super surface and receiver). Through the combined design of the transmitter, the intelligent super surface and the receiver, the performance of the wireless communication system is greatly improved. At present, the research work aiming at the joint design of a transmitter, an intelligent super-surface and a receiver generally summarizes a design scheme into a mathematical optimization problem, and a solution of the optimization problem is obtained through a series of complex optimization algorithms. The mathematical optimization method is high in computational complexity, and the actual effect of the intelligent super surface on the channel is not concerned. Moreover, most current efforts to apply intelligent hypersurfaces for wireless communications only consider the configuration of the intelligent hypersurface in a single time dimension, ignoring that the intelligent hypersurface can be configured at different time scales to change channels.
Disclosure of Invention
The technical problem is as follows: in order to overcome the problem that the existing transmission scheme is limited by a channel, the invention provides a multi-time scale intelligent super-surface configuration method for adapting the transmission scheme, and the flexible multi-time scale intelligent super-surface configuration is used for customizing a proper channel for the transmission scheme so as to fully exert the performance of the transmission scheme.
The technical scheme is as follows: in order to achieve the above object, the multi-time scale intelligent super-surface configuration method for adapting to the transmission scheme of the present invention comprises the following steps:
the method comprises the following steps: the base station determines the adopted wireless transmission scheme according to the wireless transmission performance requirement;
step two: aiming at the adopted wireless transmission scheme, the base station analyzes the channel characteristics suitable for the wireless transmission scheme;
step three: according to the required channel characteristics, the base station analyzes and determines an intelligent super-surface configuration method for realizing the channel characteristics and the required channel state information;
step four: the base station carries out channel estimation to obtain channel state information required by the intelligent super-surface configuration method;
step five: the base station configures an intelligent super surface on a corresponding time scale by using the obtained channel state information to form a channel suitable for the adopted wireless transmission scheme;
step six: and the base station and the user terminal transmit data according to a wireless transmission scheme adopted by a channel design formed by intelligent super-surface configuration.
The wireless transmission scheme is characterized in that according to the performance requirement for improving the wireless transmission rate, the base station adopts a spatial multiplexing transmission scheme in an interference limited area and adopts a beam forming transmission scheme in a noise limited area; according to the performance requirement for improving the reliability of wireless transmission, a base station adopts a space diversity transmission scheme.
The base station adopts a spatial multiplexing transmission scheme in an interference limited area, and a channel suitable for the wireless transmission scheme needs to have the characteristics of high rank, namely the channel matrix rank is greater than or equal to the number of transmission data streams and is easy to decompose into orthogonal sub-channels.
The beamforming transmission scheme is adopted in the noise-limited area, and a channel suitable for the wireless transmission scheme needs to have the characteristic that the channel matrix rank is 1 and strong correlation is achieved.
The base station adopts a space diversity transmission scheme, and a channel suitable for the wireless transmission scheme needs to have the characteristics of high diversity order and strong correlation.
The channel is required to have high rank, namely the rank of a channel matrix is more than or equal to the number of transmission data streams and is easily decomposed into orthogonal sub-channels, the channel is obtained by configuring an intelligent super surface to realize selective activation and inactivation of a signal propagation path, and the required channel state information is channel path angle information.
The channel with the channel matrix rank of 1 and the strong correlation characteristics is obtained by configuring an intelligent super surface to realize the homodromous coherent superposition and inactivation of a propagation path, and the required channel state information is channel path angle information and path gain phase information.
The channel with high diversity order and strong correlation characteristic is obtained by configuring the intelligent super surface for multiple times in the channel coherence time to realize the fast switching of the channel, and the required channel state information is channel path angle information and path gain phase information.
And after the base station performs channel estimation to obtain the information, the base station sends the configuration information to the intelligent super surface in a wired or wireless transmission mode.
When a spatial multiplexing transmission scheme is adopted, the intelligent super-surface receives configuration information and then configures the configuration information on an angle coherence time scale to form a channel which needs to have high rank, namely the rank of a channel matrix is more than or equal to the number of transmission data streams and the channel matrix is easily decomposed into orthogonal sub-channels; when a beam forming transmission scheme is adopted, the intelligent super surface receives configuration information and then configures the configuration information on a channel coherence time scale to form a channel with a channel matrix rank of 1 and strong correlation characteristics; when the space diversity transmission scheme is adopted, the intelligent super surface receives the configuration information and then configures the configuration information on the symbol time scale to form a channel with high diversity order and strong correlation characteristics.
Has the advantages that: the invention can overcome the limitation that the performance of the traditional wireless transmission scheme depends on the characteristics of the channel, and the channel capable of improving the transmission performance can be formulated by the selected transmission mode through the intelligent super-surface configuration with multiple time scales. For example, a channel which has a channel matrix rank greater than or equal to the number of transmission data streams and is easily decomposed into orthogonal sub-channel characteristics is customized for spatial multiplexing transmission to improve the spatial multiplexing gain of the channel; customizing a channel with the channel matrix rank of 1 and strong correlation characteristics for beamforming transmission to improve the signal-to-noise ratio of the channel; channels with high diversity order and strong correlation characteristics are customized for the spatial diversity transmission scheme to improve its spatial diversity gain. The invention changes the transmission mode of the passive channel into the transmission mode of the active reconstructed channel, and can improve the transmission performance and the design freedom of the wireless communication system.
Drawings
Fig. 1 is a diagram of a wireless communication system architecture employed by the method of the present invention.
Fig. 2 is a schematic diagram of channel path propagation according to an embodiment of the method of the present invention.
FIG. 3 is a flowchart of a method according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a channel with a high rank, i.e. a channel matrix rank greater than or equal to the number of transmitted data streams, and easily decomposed into orthogonal sub-channels according to an embodiment of the method of the present invention.
Fig. 5 is a schematic diagram of a channel with a channel matrix rank of 1 and strong correlation characteristics according to an embodiment of the method of the present invention.
Fig. 6 is a schematic diagram of a channel with a high diversity order and a strong correlation characteristic according to an embodiment of the method of the present invention.
Detailed Description
The invention discloses a multi-time scale intelligent super-surface configuration method adaptive to a transmission scheme, which comprises the following steps:
the method comprises the following steps: the base station determines the adopted wireless transmission scheme according to the wireless transmission performance requirement;
step two: aiming at the adopted wireless transmission scheme, the base station analyzes the channel characteristics suitable for the wireless transmission scheme;
step three: according to the required channel characteristics, the base station analyzes and determines an intelligent super-surface configuration method for realizing the channel characteristics and the required channel state information;
step four: the base station carries out channel estimation to obtain channel state information required by the intelligent super-surface configuration method;
step five: the base station configures an intelligent super surface on a corresponding time scale by using the obtained channel state information to form a channel suitable for the adopted wireless transmission scheme;
step six: and the base station and the user terminal transmit data according to a wireless transmission scheme adopted by a channel design formed by intelligent super-surface configuration.
In a preferred embodiment, the reconfigurable time of the smart super surface is less than the symbol time of the wireless transmission.
In a preferred embodiment, the number of the intelligent super-surface is greater than or equal to the minimum number of the antennas of the base station and the user terminal.
In a preferred embodiment, the multiple time scales can be divided into angular coherence time, channel correlation time, and symbol time from large to small. Specifically, the angular coherence time includes several channel coherence times, and the channel coherence time includes several symbol times.
In the preferred embodiment, according to the performance requirement for improving the wireless transmission rate, the base station adopts a spatial multiplexing transmission scheme in the interference limited area; in order to adapt the spatial multiplexing transmission scheme to fully exert the advantages of the spatial multiplexing transmission scheme, a channel needs to have the characteristics of high rank, namely the channel matrix rank is more than or equal to the number of transmission data streams and is easy to decompose into orthogonal sub-channels; the channel with the characteristics that the channel needs to have high rank, namely the rank of a channel matrix is more than or equal to the number of transmission data streams and the orthogonal sub-channels are easily decomposed can be obtained by configuring an intelligent super surface to realize selective activation and deactivation of a signal propagation path; configuring intelligent super surface to realize the selective activation and deactivation of signal propagation path and using the required channel state information as channel path angle information; the base station carries out channel estimation to obtain channel path angle information required by configuration of the intelligent super surface; a base station configures an intelligent super surface on an angle coherence time scale by using channel path angle information obtained by channel estimation to realize a channel suitable for a spatial multiplexing transmission scheme; and the base station and the user terminal design a spatial multiplexing transmission scheme according to a channel formed by intelligent super-surface configuration to transmit data.
In the preferred implementation, according to the performance requirement for improving the wireless transmission rate, the base station adopts a beam forming transmission scheme in a noise limited area; in order to adapt the beamforming transmission scheme to fully exert the advantages thereof, a channel needs to have the characteristics that the rank of a channel matrix is 1 and strong correlation is realized; the channel with the channel matrix rank of 1 and strong correlation characteristics can be obtained by configuring an intelligent super surface to realize the homodromous coherent superposition and inactivation of a propagation path; configuring intelligent super-surface to realize that channel state information required by signal propagation path homodromous coherent superposition and inactivation is channel path angle information and path gain phase information; the base station carries out channel estimation to obtain channel path angle information and path gain phase information required by configuring the intelligent super surface; a base station configures an intelligent super surface on a channel coherence time scale by using channel path angle information and path gain phase information obtained by channel estimation to realize a channel suitable for a beam forming transmission scheme; and the base station and the user terminal design a beam forming transmission scheme according to a channel formed by intelligent super-surface configuration to transmit data.
In a preferred embodiment, the base station employs a space diversity transmission scheme according to the performance requirement for improving the reliability of wireless transmission; to adapt the spatial diversity transmission scheme to take full advantage of it, the channel needs to have a high diversity order and strongly correlated characteristics; the channel with high diversity order and strong correlation characteristic can be obtained by configuring the intelligent super surface for multiple times within the channel coherence time to realize the fast channel switching; configuring channel state information required by the intelligent super-surface to realize the rapid channel switching as channel path angle information and channel gain phase information; a base station carries out channel estimation to obtain channel path angle information and path gain phase information required by configuration of an intelligent super surface; a base station uses the symbol time of channel path angle information and path gain phase information obtained by channel estimation in a channel coherence time scale to repeatedly configure an intelligent super surface so as to realize a channel suitable for a space diversity transmission scheme; and the base station and the user terminal design a space diversity transmission scheme according to a channel formed by intelligent super-surface configuration to transmit data.
The present invention is further illustrated by the following description in conjunction with the accompanying drawings, which are included to provide a further understanding of the invention and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains and which are entitled to various equivalent modifications thereof by one of ordinary skill in the art after reading this disclosure.
For the understanding of the present invention, the related knowledge of the channel model background related to the present invention will be described below. It should be noted that the method of the present invention is not limited to the expression of the following specific formula.
As shown in FIG. 1, having N T Base station with root antenna and base station with N R The direct transmission channel between the user terminals of the root antenna is interrupted by the influence of obstacles, the base station and the user terminals perform data transmission through the reflection or transmission of K intelligent super surfaces, wherein a line-of-sight transmission link exists between the base station and the intelligent super surfaces, and the number of units of the kth intelligent super surface is N S,k . As shown in fig. 2, the channel H between the base station and the user terminal formed by cascading K intelligent super surfaces can be represented as
H＝RΞT H
Wherein the content of the first and second substances,
an array response matrix for signals arriving at the subscriber terminal through all propagation paths,
represents a complex space, L R Is the number of propagation paths, a, that the signal travels through each intelligent super-surface to reach the user terminal R Denotes the antenna array response vector of the user terminal,
an angle-of-arrival (AoA) of the mth path from the mth smart super surface to the user terminal at the user terminal antenna array; (.) H Which represents the conjugate transpose operation,
array response matrix, L, for signals leaving a base station through all propagation paths T Is the number of non-line-of-sight propagation paths, a, of the signal from the base station to each intelligent super-surface T (·) represents the antenna array response vector for the base station,
the AoD (angle-of-detail) of the nth path of the mth intelligent super surface from the base station in the antenna array of the base station is represented, m is equal to {1,2, K },
the representation is represented by a matrix { xi 1 ,...,Ξ K A block diagonal matrix of (a) constituent(s),
for all path equivalent gain matrices passing through the kth intelligent hypersurface, the elements in the ith row and jth column can be expressed as (xi) k ) l,j ＝ξ k,l,j-1 In which
Representing the equivalent gain coefficient rho from the j-th incident propagation path to the l-th emergent propagation path on the k-th intelligent super surface k Represents the large-scale path loss coefficient, alpha, of the signal from the base station to the user terminal via the kth intelligent hypersurface k,R,l A small-scale fading coefficient, alpha, representing that the kth propagation path of the intelligent super surface reaches the user terminal T,k,j Represents the small-scale fading coefficient of the kth intelligent super surface jth path leaving the base station, a S,k (. H) an array response vector, Γ, representing the kth Intelligent Supersurface k Representing the response matrix of the kth intelligent meta-surface to electromagnetic waves.
Based on the above technical background description, as shown in fig. 3, in the multi-time scale intelligent super-surface configuration method adapted to the transmission scheme disclosed in the embodiment of the present invention, an appropriate channel is customized for the adopted transmission scheme by configuring the intelligent super-surface on the multi-time scale. The method mainly comprises the following steps: firstly, a base station determines an adopted wireless transmission scheme according to the wireless transmission performance requirement; then, aiming at the adopted wireless transmission scheme, the base station analyzes the channel characteristics suitable for the wireless transmission scheme; secondly, according to the required channel characteristics, the base station analyzes and determines an intelligent super-surface configuration method for realizing the channel characteristics and the required channel state information; thirdly, the base station carries out channel estimation to obtain channel state information required by the intelligent super-surface configuration method; then, the base station configures an intelligent super surface on a corresponding time scale by using the obtained channel state information to form a channel suitable for the adopted wireless transmission scheme; and finally, the base station and the user terminal transmit data according to a wireless transmission scheme adopted by a channel design formed by intelligent super-surface configuration. The method specifically comprises the following steps:
step S1: the base station determines the adopted wireless transmission scheme according to the wireless transmission performance requirement. According to the performance requirement for improving the wireless transmission rate, the base station adopts a spatial multiplexing transmission scheme in an interference limited area and adopts a beam forming transmission scheme in a noise limited area; according to the performance requirement for improving the reliability of wireless transmission, the base station adopts a space diversity transmission scheme.
Step S2: for the employed radio transmission scheme, the base station analyzes the channel characteristics suitable for the radio transmission scheme.
When the base station adopts the spatial multiplexing transmission scheme, as shown in fig. 4, the channel suitable for the wireless transmission scheme needs to have the characteristics that the channel needs to have high rank, i.e. the channel matrix rank is greater than or equal to the number of transmission data streams and is easily decomposed into orthogonal sub-channels, i.e. the channel can be approximately represented as
Wherein, the matrix is added with subscript (.) SM Representing a subset of the matrix under a spatial multiplexing transmission scheme,
satisfy the requirement of
I is a unit array, and the unit array is,
is approximate to a diagonal matrix and is provided with a plurality of parallel lines,
satisfy the requirements of
When the base station adopts the beamforming transmission scheme, as shown in fig. 5, the channel suitable for the wireless transmission scheme needs to have the characteristics that the channel matrix rank is 1 and the channel is strongly correlated, that is, the channel can be approximately expressed as
Wherein, the matrix is added with subscript (·) BF Representing a subset of the matrix under the beamforming transmission scheme,
satisfy the requirement of
1 K×K Is a full 1 matrix of K rows and K columns,
is approximate to a diagonal matrix,
satisfy the requirements of
When the base station adopts the space diversity transmission scheme, the channel suitable for the wireless transmission scheme needs to have high diversity order and strong correlation characteristics, i.e. the channel can be expressed as
Wherein M is R The number of times the smart super-surface is reconfigured for one symbol time, as shown in FIG. 6, H m The channel formed for the mth smart super-surface configuration can be expressed as
Wherein, the matrix is added with subscript (·) DS,m Represents a subset of the matrix under a space diversity transmission scheme at the mth intelligent super-surface configuration, the matrix is indexed (·) DS Representing a subset of the matrix under a spatially diverse transmission scheme,
satisfy the requirement of
1 K×K Is a full 1 matrix of K rows and K columns,
is approximate to a diagonal matrix and is provided with a plurality of parallel lines,
satisfy the requirement of
And step S3: and according to the required channel characteristics, the base station analyzes and determines the intelligent super-surface configuration method for realizing the channel characteristics and the required channel state information.
The channel with the characteristics that the channel needs to have high rank, namely the rank of a channel matrix is more than or equal to the number of transmission data streams and is easily decomposed into orthogonal sub-channels can be obtained by configuring the intelligent super surface to realize the selective activation and deactivation of a signal propagation path, and the phase shift configuration of the nth unit of the kth intelligent super surface can be expressed as
Wherein the content of the first and second substances,
AoD on the intelligent super-surface array for the kth intelligent super-surface to user terminal ith propagation path,
and the AoA of the propagation path on the intelligent super-surface array is the k-th intelligent super-surface from the base station line of sight. The channel state information required by the intelligent super-surface to realize the selective activation and deactivation of the signal propagation path is channel path angle information.
The channel with the channel matrix rank of 1 and strong correlation characteristics can be obtained by configuring the intelligent super surface to realize the cocurrent coherent superposition and inactivation of the propagation path, and the phase shift configuration of the nth unit of the kth intelligent super surface can be expressed as
Wherein the content of the first and second substances,
AoD on the intelligent super-surface array for the kth intelligent super-surface to user terminal ith propagation path,
the AoA and the angle alpha of a propagation path of the kth intelligent super surface on the intelligent super surface array from the base station sight distance k,R,l ∠α T,k,0 And respectively represent alpha k,R,l And alpha T,k,0 The phase of (c). The channel state information required by realizing the homodromous coherent superposition and inactivation of the signal propagation path by configuring the intelligent super surface is channel path angle information and path gain phase information.
The channel with high diversity order and strong correlation characteristic can be obtained by configuring the intelligent super surface for multiple times within the channel coherence time to realize fast channel switching, and in the mth configuration within the channel coherence time, the nth unit phase shift configuration of the kth intelligent super surface can be expressed as
Wherein the content of the first and second substances,
and
respectively from the kth intelligent super surface to the user terminal in the mth configuration within the channel coherence time m The AoD of each propagation path on the intelligent super-surface array and the AoA of the antenna array at the user terminal,
and the AoA of the propagation path on the intelligent super-surface array is viewed from the base station for the kth intelligent super-surface. In different configurations, the transmission path from the kth intelligent super surface to the user terminal is different, i.e. when m ≠ s, l m ≠l s . The channel state information required by realizing the homodromous coherent superposition and inactivation of the signal propagation path by configuring the intelligent super surface is channel path angle information and path gain phase information.
And step S4: and the base station carries out channel estimation to obtain channel state information required by the intelligent super-surface configuration method. When the base station adopts a space multiplexing transmission scheme, the base station needs to perform channel estimation to acquire channel path angle information; when the base station adopts a beam forming or space diversity transmission scheme, the base station needs to perform channel estimation to acquire channel path angle information and path gain phase information.
Step S5: and the base station configures the intelligent super surface on a corresponding time scale by using the obtained channel state information to form a channel suitable for the adopted wireless transmission scheme. And the base station sends the configuration information to the intelligent super surface in a wired or wireless transmission mode. When a spatial multiplexing transmission scheme is adopted, the intelligent super surface receives configuration information and then configures on an angle coherence time scale to form a channel which has the characteristics that the channel needs to have high rank, namely the rank of a channel matrix is more than or equal to the number of transmission data streams and the channel is easily decomposed into orthogonal sub-channels; when a beam forming transmission scheme is adopted, the intelligent super surface receives configuration information and then configures the configuration information on a channel coherence time scale to form a channel with a channel matrix rank of 1 and strong correlation characteristics; when the space diversity transmission scheme is adopted, the intelligent super surface receives the configuration information and then configures on a symbol time scale to form a channel with high diversity order and strong correlation characteristics.
Step S6: and the base station and the user terminal transmit data according to a wireless transmission scheme adopted by a channel design formed by intelligent super-surface configuration.
When the base station adopts a space diversity transmission scheme, a channel is formed according to the configuration of the intelligent super surface on the angle coherence time
The base station and the user terminal design a wireless transmission scheme for data transmission, i.e. the precoder F of the base station SM And a synthesizer W of the user terminal SM Are respectively represented as
Wherein E is the total transmitting power of the base station;
when the base station adopts a beam forming transmission scheme, the channel is formed according to the configuration of the intelligent super surface on the channel coherence time
The base station and the user terminal design a wireless transmission scheme for data transmission, i.e. the precoder f of the base station BF And a synthesizer w of the user terminal BF Are respectively represented as
Wherein, I F Represents the F norm;
when the base station adopts a space diversity transmission scheme, the channel is formed according to the configuration of the intelligent super surface in the channel coherence time
The base station and the user terminal design a wireless transmission scheme for data transmission, namely in the m-th configuration in the channel coherence time, the precoder F of the base station DS And a synthesizer W of the user terminal DS,m Are respectively represented as
Claims (10)
1. A multi-time scale intelligent super-surface configuration method adapting to a transmission scheme is characterized by comprising the following steps:
the method comprises the following steps: the base station determines the adopted wireless transmission scheme according to the wireless transmission performance requirement;
step two: aiming at the adopted wireless transmission scheme, the base station analyzes the channel characteristics suitable for the wireless transmission scheme;
step three: according to the required channel characteristics, the base station analyzes and determines an intelligent super-surface configuration method for realizing the channel characteristics and the required channel state information;
step four: the base station carries out channel estimation to obtain channel state information required by the intelligent super-surface configuration method;
step five: the base station configures an intelligent super surface on a corresponding time scale by using the obtained channel state information to form a channel suitable for the adopted wireless transmission scheme;
step six: and the base station and the user terminal perform data transmission according to a wireless transmission scheme adopted by a channel design formed by intelligent super-surface configuration.
2. The multi-time scale intelligent super-surface configuration method of the adaptive transmission scheme according to claim 1, wherein the wireless transmission scheme is based on the performance requirement of improving the wireless transmission rate, and the base station adopts a spatial multiplexing transmission scheme in an interference limited area and a beamforming transmission scheme in a noise limited area; according to the performance requirement for improving the reliability of wireless transmission, the base station adopts a space diversity transmission scheme.
3. The method as claimed in claim 2, wherein the base station employs a spatial multiplexing transmission scheme in the interference limited region, and the channel suitable for the wireless transmission scheme has a high rank, i.e. the channel matrix rank is greater than or equal to the number of transmitted data streams and is easily decomposed into orthogonal sub-channels.
4. The method as claimed in claim 2, wherein the beamforming transmission scheme is adopted in the noise-limited region, and the channel suitable for the wireless transmission scheme has a channel matrix rank of 1 and strong correlation.
5. The method of claim 2, wherein the base station employs a space diversity transmission scheme, and the channel suitable for the wireless transmission scheme has a high diversity order and is strongly correlated.
6. The method as claimed in claim 3, wherein the channel has a high rank, i.e. the channel matrix rank is greater than or equal to the number of transmission data streams and is easily decomposed into orthogonal sub-channels, and the method is implemented by configuring an intelligent super-surface to selectively activate and deactivate signal propagation paths, and the required channel state information is channel path angle information.
7. The method as claimed in claim 4, wherein the channel with channel matrix rank of 1 and strong correlation characteristic is obtained by configuring an intelligent super surface to implement coherent superposition and deactivation of propagation paths in the same direction, and the required channel state information is channel path angle information and path gain phase information.
8. The method as claimed in claim 5, wherein the channel with high diversity order and strong correlation characteristic is obtained by configuring the intelligent super-surface multiple times within the channel coherence time to realize fast channel switching, and the required channel state information is channel path angle information and path gain phase information.
9. The multi-time scale intelligent super-surface configuration method according to claim 1, wherein the base station performs channel estimation to obtain channel state information required by the intelligent super-surface configuration method, and then sends configuration information to the intelligent super-surface in a wired or wireless transmission manner.
10. The method according to claim 2, wherein when a spatial multiplexing transmission scheme is employed, the intelligent super-surface receives configuration information and then performs configuration on an angular coherence time scale to form a channel having a channel matrix rank equal to or greater than the number of transmission data streams and being easily decomposed into orthogonal sub-channel characteristics; when a beam forming transmission scheme is adopted, the intelligent super surface receives configuration information and then configures the configuration information on a channel coherence time scale to form a channel with a channel matrix rank of 1 and strong correlation characteristics; when the space diversity transmission scheme is adopted, the intelligent super surface receives the configuration information and then configures the configuration information on the symbol time scale to form a channel with high diversity order and strong correlation characteristics.
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| CN116827405B (en) * | 2023-08-23 | 2023-11-10 | 华南理工大学 | Polarization segmentation type information and energy simultaneous transmission system |
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