Hybrid intelligent reflection surface-based communication and induction integrated system transmission method

Abstract

The invention discloses a communication and sensing integrated system transmission method based on a mixed intelligent reflecting surface, which comprises the following steps of: firstly, selecting the most suitable mixed intelligent reflecting surface, and then dynamically selecting the most suitable working mode of the intelligent reflecting surface from a passive mode and an active mode according to a channel condition; in the passive mode, the signal is directly reflected to a user, in the active mode, the signal is amplified and then sent to the user, and the overall performance of the communication and induction integrated system is maximized by reasonably arranging the intelligent reflecting surface and the working mode thereof.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and particularly to a transmission method for a communication and sensing integrated system based on a hybrid intelligent reflecting surface, characterized by selecting a suitable hybrid intelligent reflecting surface according to the channel information of the communication and sensing integrated system and arranging its working state. Background Art

[0002] Hybrid Intelligent Reflecting Surface (H-IRS) is an emerging technology mainly applied in wireless communication and intelligent networks to optimize signal transmission and improve the efficiency of communication systems. It combines active and passive working modes and can switch according to the environment and requirements, thereby achieving more flexible wireless resource management and signal enhancement. "Communication and sensing integration" refers to the close combination of communication and sensing (sensing) technologies, and its core goal is to achieve more efficient wireless communication and more accurate environmental perception by sharing hardware, spectrum, and signal resources. In 5G and future wireless communication technologies, communication and sensing integration will become one of the key technologies. Especially in application scenarios such as smart cities, autonomous driving, and the Internet of Things (IoT), the high integration of communication and sensing can bring better system performance and user experience. Hybrid intelligent reflecting surface and communication and sensing integration are two major frontier technologies in the current wireless communication field. The combination of the two is expected to achieve a deep integration of communication and sensing capabilities in 6G and future networks, promoting the development of intelligent wireless environments. In existing communication and sensing integrated systems assisted by hybrid intelligent reflecting surfaces, generally, the currently working reflecting surface is randomly selected, and then the working surface is randomly determined to work in the active or passive mode, which affects the improvement of the system performance by the hybrid intelligent reflecting surface. Therefore, the present invention provides a communication and sensing integrated system based on a hybrid intelligent reflecting surface. Summary of the Invention

[0003] The purpose of the present invention is to provide a transmission method for a communication and sensing integrated system based on a hybrid intelligent reflecting surface, and the technical problem to be solved is: in a communication and sensing integrated system based on a hybrid intelligent reflecting surface, how to select the most suitable hybrid intelligent reflecting surface and reasonably arrange the working state of the hybrid intelligent reflecting surface to improve the overall performance of the system.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A transmission method for a communication and sensing integrated system based on a hybrid intelligent reflecting surface,

[0006] The integrated communication and sensing system based on the hybrid intelligent reflecting surface includes a base station, K hybrid intelligent reflecting surfaces each composed of n reflecting units, a user, and m sensing receivers. The user is both a communication receiving node and a node to be sensed. n≥1, m≥1, K≥1.

[0007] The base station and the user assist in transmitting signals through the hybrid intelligent reflecting surface, and the sensing receivers receive the signals reflected by the user. The working mode of the hybrid intelligent reflecting surface is divided into an active mode and a passive mode.

[0008] When the k-th hybrid intelligent reflecting surface operates in the passive mode, the i-th reflecting unit on it adjusts the phase according to the communication link optimization criterion, and the communication capacity C c (k) and the sensing capacity C s (k) corresponding to all sensing receivers are respectively

[0009]

[0010] where B is the bandwidth, h 3i are the channels from the base station to the i-th reflecting unit of the k-th hybrid intelligent reflecting surface, from the i-th reflecting unit of the k-th hybrid intelligent reflecting surface to the user, and from the user to the j-th sensing receiver respectively. P is the transmission power of the base station. k is a positive integer between 1 and K, i is a positive integer between 1 and n, and j is a positive integer between 1 and m. and respectively represent the powers of n1 and n 2j and n1 and n 2j represent the receiving noises of the user and the j-th sensing receiver respectively;

[0011] When the hybrid intelligent reflecting surface operates in the active mode, the i-th reflecting unit on it adjusts the phase according to the communication link optimization criterion, and the communication capacity C c (k) and the sensing capacity C s (k) corresponding to all sensing receivers are respectively

[0012]

[0013] where represents the power of n RISi,k and n RISi,k represents the receiving noise of the i-th reflecting unit of the k-th hybrid intelligent reflecting surface, and α i represents the amplification coefficient on the i-th reflecting unit;

[0014] First step, according to the current service requirements of the system for communication and sensing, determine the communication-sensing coefficient w;

[0015] Step 2: Channel estimation to obtain the channel state information;

[0016] Step 3: Calculate C c (k), C s (k), C c '(k), C s '(k);

[0017] Step 4: Determine the serial number of the hybrid intelligent reflecting surface for the current operation, where argmax represents the value of the independent variable when the function reaches its maximum value;

[0018] Step 5: If C c (k * ) + wC s (k * ) ≥ C c '(k * ) + wC s '(k * ), the reflecting surface determined in Step 4 operates in the passive mode. If C c (k * ) + wC s (k * ) < C c '(k * ) + wC s '(k * ), the reflecting surface determined in Step 4 operates in the active mode.

[0019] Step 6: Start transmission and sensing;

[0020] Step 7: Return to Step 1.

[0021] The present invention calculates the communication capacity and sensing capacity of the system based on the system channel state information, reasonably selects the hybrid intelligent reflecting surface in the communication and sensing integrated system and arranges its working state. In the passive mode, the signal is directly reflected to the user, while in the active mode, the signal is amplified and then sent to the user, improving the overall communication and sensing capabilities of the communication and sensing integrated system. Compared with the traditional random working state arrangement method, this method can achieve better system performance. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the communication and sensing integrated system based on the hybrid intelligent reflecting surface of the present invention.

[0023] Figure 2 It is a schematic flowchart of the transmission method of the communication and sensing integrated system based on the hybrid intelligent reflecting surface of the present invention.

[0024] Figure 3This is a comparison chart of the transmission method of the communication-sensing integrated system based on the hybrid intelligent reflecting surface, the reflecting surface, and the system capacity of the random working method of the working mode. Detailed implementation mode

[0025] The following is further described in conjunction with the accompanying drawings and specific embodiments.

[0026] As Figure 1 shown, the communication-sensing integrated system based on the hybrid intelligent reflecting surface includes a base station, K hybrid intelligent reflecting surfaces composed of n reflecting units, 1 user, and m sensing receivers. The user is both a communication receiving node and a node to be sensed. The hybrid intelligent reflecting surface includes active elements and passive elements, and correspondingly, the working modes are divided into an active mode and a passive mode, where n≥1, m≥1, and K≥1. There are obstacles between the base station and the user. Due to the obstacle occlusion, the signal can only be transmitted with the assistance of the hybrid intelligent reflecting surface.

[0027] After the base station sends the signal x, when the k-th hybrid intelligent reflecting surface works in the passive mode, the working units on it adjust the phase according to the communication link optimal criterion. The received signals of the user and the j-th sensing receiver are respectively

[0028]

[0029] where h 3i are respectively the channels from the base station to the i-th reflecting unit of the k-th hybrid intelligent reflecting surface, from the i-th reflecting unit of the k-th hybrid intelligent reflecting surface to the user, and from the user to the j-th sensing receiver. n1 and n 2j respectively represent the received noises of the user and the j-th sensing receiver. P is the transmission power of the base station. k is a positive integer between 1 and K, i is a positive integer between 1 and n, and j is a positive integer between 1 and m. When the bandwidth is B, the corresponding communication capacity C c (k) and the sensing capacity C s (k) are respectively

[0030]

[0031] where and respectively represent the powers of n1 and n 2j .

[0032] When the hybrid intelligent reflecting surface works in the active mode, the working units on it adjust the phase according to the communication link optimal criterion. The received signals of the user and the j-th sensing receiver are respectively

[0033]

[0034]

[0035] where n RISi,k represents the received noise of the i-th reflecting element of the k-th hybrid intelligent reflecting surface, and α i represents the amplification factor on the i-th reflecting element.

[0036] When the bandwidth is B, the corresponding communication capacity C c '(k) and the sensing capacity C s '(k) are respectively

[0037] where, represents the power of n RISi,k .

[0038] As Figure 2 shown, the transmission method of the communication and sensing integrated system based on the hybrid intelligent reflecting surface, that is, the method for determining the working state of the hybrid intelligent reflecting surface, is determined by the following steps:

[0039] First step, according to the communication and sensing requirements of the current service of the system, determine the communication sensing coefficient w;

[0040] Second step, channel estimation to obtain channel state information;

[0041] Third step, calculate C c (k), C s (k), C c '(k), C s '(k) respectively;

[0042] Fourth step, determine the serial number of the hybrid intelligent reflecting surface currently in operation by argmax represents the value of the independent variable k when the function takes the maximum value, that is, the most suitable reflecting surface of the system is determined through this step;

[0043] Fifth step, if C c (k * ) + wC s (k * ) ≥ C c '(k * ) + wC s '(k * ), the reflecting surface determined in the fourth step operates in the passive mode. If C c (k * ) + wC s (k * ) < C c '(k * ) + wC s '(k *) The reflective surface determined in Step Four operates in an active mode.

[0044] Step Six: Start transmission and sensing;

[0045] Step Seven: Transition to Step One.

[0046] Figure 3 The weighted capacity performance differences between the above method and the random node selection method were compared, where n = 10, m = 3, K = 4, w = 1.3. It can be seen that the solution described in the present invention can achieve better performance compared to the random operating mode.

Claims

1. A synaesthesia integrated system transmission method based on hybrid intelligent reflective surface, characterized in that: The synaesthesia integrated system based on hybrid intelligent reflective surface includes a base station, K hybrid intelligent reflective surfaces composed of n reflective units, a user, and m perception receivers. The user is both a communication receiving node and a node to be perceived. n≥1, m≥1, K≥1, The base station and the user are assisted in transmitting signals through a hybrid intelligent reflective surface, and the sensing receiver receives the signal reflected by the user. The working mode of the hybrid intelligent reflective surface is divided into active mode and passive mode. When the kth hybrid intelligent reflective surface works in passive mode, the i-th reflective unit on it adjusts the phase according to the optimal criterion of the communication link, and the communication capacity C corresponding to the user c (k) and the sensing capacity C corresponding to all sensing receivers s (k) respectively, Where B is the bandwidth, h 3i are the channels from the base station to the i-th reflection unit of the k-th hybrid intelligent reflection surface, from the i-th reflection unit of the k-th hybrid intelligent reflection surface to the user, and from the user to the j-th sensing receiver, respectively. P is the base station transmit power, k is a positive integer between 1 and K, i is a positive integer between 1 and n, and j is a positive integer between 1 and m. and Represents n1 and n respectively 2j The power, n1 and n 2j Represent the receiving noise of the user and the jth sensing receiver respectively; When the hybrid intelligent reflective surface works in active mode, the i-th reflective unit on it adjusts the phase according to the optimal criterion of the communication link, and the communication capacity C corresponding to the user c '(k) and the corresponding sensing capacity C of all sensing receivers s '(k) are: in, Indicates n RISi,k The power, n RISi,k represents the receiving noise of the i-th reflection unit of the k-th hybrid smart reflection surface, α i represents the magnification factor on the i-th reflection unit; The first step is to determine the communication perception coefficient w according to the communication and perception requirements of the current system business; The second step is channel estimation to obtain channel state information; The third step is to calculate C c (k), C s (k), C c '(k), C s '(k); The fourth step is Determine the serial number of the hybrid intelligent reflective surface currently in operation, argmax represents the value of the independent variable when the function takes the maximum value; Step 5: If C c (k * )+wC s (k * )≥C c '(k * )+wC s '(k * ), the reflective surface determined in step 4 works in passive mode, if C c (k * )+wC s (k * )<C c '(k * )+wC s '(k * ), the reflective surface determined in step 4 operates in active mode; Step 6: Start transmission and perception; Step 7: Go to step 1.

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