Symbiotic communication system multi-antenna multicast transmission method based on intelligent reflection surface

A multicast transmission and communication system technology, applied in the field of multi-antenna multicast transmission in symbiotic communication systems, can solve problems such as reflection link fading and limited enhancement of communication performance of the main system, and achieve minimum transmission power and strong application Effect of value and development potential, increased spectrum and cost overhead

Active Publication Date: 2021-03-19
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0003] Due to the serious fading of the reflective link, its enhancement e

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  • Symbiotic communication system multi-antenna multicast transmission method based on intelligent reflection surface
  • Symbiotic communication system multi-antenna multicast transmission method based on intelligent reflection surface
  • Symbiotic communication system multi-antenna multicast transmission method based on intelligent reflection surface

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[0027]The present invention will be described in detail below with reference to the accompanying drawings and simulation examples.

[0028]The present invention proposes a multi-antenna multicast transmission method based on a smart surface: system composition structurefigure 1 As shown, by a base station configuring M root antennas, a IOT receiver that configures Q root antennas, an intelligent surface containing N passive reflecting units and IRS controllers connected thereto, and K single antenna main receiver . Among them, K primary receivers are divided into group g according to the information demand.The primary receiver in the same group also requests the same information, and each primary receiver can only belong to a group, ie the main receiverLet M ≥ 1, q ≥ 1, k ≥ 1, 1 ≤ g ≤ K.

[0029]The basic working principle of multi-antenna multicast transmission method based on smart surface is: base station through active beam excipient, multicast independent signal to each group of prim...

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Abstract

The invention belongs to the technical field of wireless communication, and relates to a symbiotic communication system multi-antenna multicast transmission method based on an intelligent reflection surface. According to the symbiotic communication system multi-antenna multicast transmission method based on the intelligent reflection surface, the intelligent reflection surface sends own Internet of Things information symbols through multicast signals of a main system, and downlink multicast transmission from a base station to a main receiver can be enhanced through the intelligent surface; both the main receiver and the IoT receiver receive a direct link signal from the base station and a reflected signal from the smart surface. The invention further provides a method for jointly optimizing the active beamforming W of the base station end and the passive beamforming phi of the intelligent surface end, and minimization of the transmitting power of the base station is realized under thecondition of meeting the requirements of the signal to interference plus noise ratio of the main receiver and the signal to noise ratio of the IoT receiver. Through simulation verification, under thecondition that normal communication of the main system is not influenced, the transmitting power and energy of the base station are greatly saved, and the frequency spectrum and cost expenditure are not additionally increased.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a multi-antenna multicast transmission method of a symbiotic communication system based on an intelligent reflective surface. Background technique [0002] Symbiotic Radio (SR) is a wireless communication technology with extremely high energy efficiency, high spectral efficiency and extremely low cost proposed based on environmental backscatter communication. , IoT) has important application prospects. Specifically, the passive backscatter device can modulate its own information onto the received main system communication signal for IoT transmission, and in return, the reflective link can provide additional multipath to enhance the main system communication, thus realizing Reciprocity in symbiotic radio. [0003] Due to the severe fading of reflective links, their enhancement effect on the communication performance of the main system is still limited....

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Application Information

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IPC IPC(8): H04B7/08H04W52/02
CPCH04B7/0857H04B7/086H04W52/0206Y02D30/70
Inventor 梁应敞杨刚舒凡一
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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