RIS-assisted multi-user downlink robust wireless transmission method based on partial CSI

A wireless transmission, multi-user technology, applied in radio transmission systems, diversity/multi-antenna systems, wireless communications, etc., can solve problems such as inability to eliminate negative effects, achieve robust beam and phase shift, save energy, and ensure demand Effect

Active Publication Date: 2021-06-18
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Claims
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Problems solved by technology

However, these techniques only focus on the signal processing of the transceiver to adapt to changes in the wireless environment, but cannot eliminate the negative effects caused by the uncontrollable electromagnetic wave propagation environment

Method used

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  • RIS-assisted multi-user downlink robust wireless transmission method based on partial CSI
  • RIS-assisted multi-user downlink robust wireless transmission method based on partial CSI
  • RIS-assisted multi-user downlink robust wireless transmission method based on partial CSI

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Embodiment Construction

[0055] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0056] Such as figure 1 As shown, the present invention proposes a RIS-assisted multi-user downlink robust wireless transmission method based on partial CSI, which specifically includes the following steps:

[0057] Step 1: Build a RIS-assisted multi-user downlink wireless transmission system, such as figure 2 As shown, the system includes a multi-antenna base station, a RIS composed of multiple passive reflection units, and multiple single-antenna users.

[0058] Step 2: For the RIS-assisted multi-user downlink wireless transmission system, multiple single-line users and the base station transmit pilot signals to the RIS respectively, and the RIS estimates the erroneous CSI from the RIS to the base station and the user respectively.

[0059] There are K users in the system, the base station has N antennas, the RIS has L pass...

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Abstract

The invention discloses an RIS-assisted multi-user downlink robust wireless transmission method based on partial CSI. The RIS-assisted multi-user downlink wireless transmission method comprises the following steps: firstly, constructing an RIS-assisted multi-user downlink wireless transmission system comprising a multi-antenna base station, an RIS consisting of a plurality of passive reflection units and a plurality of single-antenna users; secondly, aiming at an RIS-assisted multi-user downlink wireless transmission system, a plurality of users and a base station respectively transmit pilot signals to the RIS, and the RIS respectively estimates CSI with errors from the RIS to the base station and the users; and finally, maximizing the large system approximation sum rate of multiple users as an optimization target, designing a beam matrix and an RIS phase matrix by means of the estimated CSI, and carrying out signal transmission. According to the method, non-ideal CSI is considered, minimization of transmission power is taken as an optimization target, an actual application scene is better met, phase shift and beam vectors are alternately optimized, the method is more robust, the effect of saving energy consumption is achieved, and the lowest requirement of user safety communication is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a RIS (Reconfigurable Intelligent Surface) assisted multi-user downlink robust wireless transmission method based on partial CSI (Channel State Information, channel state information), so that information is more Efficient transmission, and increase the security of information transmission. Background technique [0002] With the development of the times, it becomes feasible to use RIS to assist multi-user downlink robust wireless transmission method. Due to the huge increase in the number of communication devices, various wireless technologies have been proposed to improve spectrum and energy efficiency, such as multiple-input multiple-output, cooperative communication, cognitive radio, and so on. However, these techniques only focus on the signal processing of the transceiver to adapt to changes in the wireless environment, but cannot eliminate the ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/145H04W52/02H04L25/02H04B7/06H04W12/00
CPCH04B7/145H04W52/0206H04L25/0204H04L25/0224H04B7/0626H04W12/00Y02D30/70
Inventor 张军颜久其李成栋廖文仕汪东乾
Owner NANJING UNIV OF POSTS & TELECOMM
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