Multi-user RIS precoding method and device, computer equipment and storage medium
A precoding and multi-user technology, applied in electrical components, radio transmission systems, transmission systems, etc., to achieve low power consumption, improve energy efficiency, and reduce power consumption
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Embodiment 1
[0067] In order to facilitate the description of this embodiment, the following symbols are first defined: bold uppercase and lowercase letters are used to represent matrices and vectors, respectively; and are the complex number field and the real number field, respectively; |·| represents the modulus of complex numbers; represents the gradient to the variable x; is the expectation operator; || · || 2 and || · || F respectively denote l 2 norm and Frobenius norm. (·) H and(·) T Represents Hermitian vector / matrix and transpose of vector / matrix, respectively. vec( ) is a vectorization operator; when diag( ) is applied to a matrix, it retrieves its diagonal entries as a vector, and when applied to a vector, it creates a in its diagonal matrix; is the Kronecker product of matrix A and matrix B.
[0068] (1) System model and performance indicators
[0069] Consider the downlink of a system consisting of a system with T=T v ×T h The base station is composed of 1 un...
Embodiment 2
[0205] like Figure 4 As shown, this embodiment provides a multi-user-oriented RIS precoding communication device, which includes a precoding building module 401, a transmission signal matrix module 402, a RIS reflection matrix module 403, a step size adaptation module 404, and an iterative convergence module. 405, the specific functions of each module are as follows:
[0206] The precoding building module 401 is used to introduce an intelligent reflector, the base station reflects the transmit signal to the single-antenna user terminal, optimizes the transmit signal matrix and the RIS reflection matrix to improve the signal reception quality, and constructs the minimization problem of multi-user interference energy, namely
[0207]
[0208]
[0209] |ω i,i |=1,1≤i≤L
[0210] in, represents the transmitted signal matrix in the time slot, Represents a complex space of T×N dimensions, X=[x 1 ,...,x N ], Represents the signal vector sent by the base station in tim...
Embodiment 3
[0225] This embodiment provides a computer device, and the computer device can be a computer, such as Figure 5 As shown, it is connected by a system bus 501 to a processor 502, a memory, an input device 503, a display 504 and a network interface 505 for providing computing and control capabilities, the memory including a non-volatile storage medium 506 and internal memory 507, the non-volatile storage medium 506 stores an operating system, a computer program and a database, the internal memory 507 provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium, and the processor 502 executes the memory stored in the memory. When a computer program is implemented, a multi-user-oriented RIS precoding communication method proposed in the above-mentioned embodiment 1 is implemented, as follows:
[0226] S1. The base station reflects the signal to the user through the intelligent reflector, considering the digital / analo...
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