Reconfigurable intelligent surface-assisted NOMA downlink low-power-consumption transmission method

A transmission method and low power consumption technology, applied in the field of reconfigurable smart surface in wireless communication, can solve the problems affecting the power efficiency of RIS auxiliary system, unable to maximize the advantages of RIS, and unable to jointly use RIS and NOMA

Pending Publication Date: 2020-12-29
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] In the emerging RIS-assisted NOMA downlink system, neither the traditional orthogonal multiple access transmission scheme nor the RIS-assisted transmission NOMA scheme can jointly take advantage of the advantages of RIS and NOMA in the system, and, for a simple RIS phase offset Design s

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  • Reconfigurable intelligent surface-assisted NOMA downlink low-power-consumption transmission method
  • Reconfigurable intelligent surface-assisted NOMA downlink low-power-consumption transmission method
  • Reconfigurable intelligent surface-assisted NOMA downlink low-power-consumption transmission method

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Embodiment Construction

[0068] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0069] The present invention considers a cellular downlink single-antenna NOMA transmission scenario with a coverage radius of R. The base station is located in the center of the coverage area. n within the circular coverage area. In the NOMA transmission mode, the base station provides services for U users simultaneously on the same time-frequency resource block, and a RIS with N reflection units is deployed in the cell coverage area. The distance between base station and RIS, the distance between base station and user u, and the distance between RIS and user u are respectively d B,I , d B,u , d I,u . The system model structure of the present invention is as figure 2 shown.

[0070] The overall process of the NOMA downlink low-power transm...

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Abstract

The invention discloses a reconfigurable intelligent surface assisted NOMA (Non-Orthogonal Multiple Access) downlink low-power transmission method. On the premise of ensuring the signal to interference plus noise power ratio requirement of the user, establishing an optimization problem of base station power distribution and RIS phase deviation; establishing a conversion relation between the powerdistribution coefficient and the RIS phase deviation factor by utilizing the characteristics of the optimization problem, and converting the original optimization problem into a pure phase deviation optimization problem; further simplifying the optimization problem by using a phase-by-phase rotation method, and solving the optimal phase offset of each iteration through a one-dimensional search andpenalty function method; and repeating iteration until the target function converges to obtain an optimal phase shift matrix of the RIS and a base station power distribution coefficient. Compared with a traditional orthogonal multiple access transmission scheme, an RIS-free transmission scheme, an RIS random phase offset transmission scheme and an RIS equal phase offset transmission scheme, the transmission method provided by the invention can significantly reduce the total emission power consumption of the system.

Description

technical field [0001] The invention relates to the technical field of reconfigurable smart surfaces in wireless communication, in particular to a non-orthogonal multiple access (NOMA) downlink low-power transmission method assisted by reconfigurable smart surfaces. Background technique [0002] The propagation environment of traditional wireless communication is random and uncontrollable, which will bring certain damage to information transmission. In recent years, with the development of artificial electromagnetic materials, reconfigurable smart surfaces (RIS) have been proposed, which can intelligently configure the wireless communication propagation environment, thereby significantly improving the performance of wireless communication networks. As a passive device, RIS does not have any signal processing capabilities. It only needs to configure its phase offset according to the channel characteristics to realize the adjustment of the wireless signal propagation direction...

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Application Information

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IPC IPC(8): H04W16/14H04W24/02H04W52/26
CPCH04W16/14H04W24/02H04W52/265
Inventor 王鸿张翔宇
Owner NANJING UNIV OF POSTS & TELECOMM
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