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Delay-limited uplink power distribution method in millimeter wave communication assisted by intelligent reflecting surface

A power and link delay technology, applied in the field of uplink power allocation, which can solve problems such as mmWave link blocking

Inactive Publication Date: 2020-05-15
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide an effective method for uplink transmission power allocation of IRS-assisted mmWave communication under communication delay constraints, that is, IRS can solve mmWave link blocking problem by creating supplementary links, so as to ensure Upload data in real time under strict latency requirements

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  • Delay-limited uplink power distribution method in millimeter wave communication assisted by intelligent reflecting surface
  • Delay-limited uplink power distribution method in millimeter wave communication assisted by intelligent reflecting surface
  • Delay-limited uplink power distribution method in millimeter wave communication assisted by intelligent reflecting surface

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[0027] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0028] see figure 1 , the application scenario of the present invention is: an uplink multi-user mmWave network, including a BS, an IRS and multiple users. The IRS is deployed at a line-of-sight (LoS) position with the base station, and users are closer to the IRS. The BS can acquire all the CSIs by using the channel reciprocity through the Time Division Duplex (TDD) protocol. According to the obtained channel state and the maximum upload delay requirements of different users, the BS jointly optimizes the phase shift of the IRS and the multi-user detection vector, thereby reducing the transmit power of the user equipment.

[0029] Our goal is to minimize the uplink transmission power of the user equipment on the premise that the SINR of the signal received by ...

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Abstract

The invention provides a power distribution method considering delay limitation in a millimeter wave (mmWave) uplink communication system assisted by an intelligent reflection surface (IRS). Accordingto the method, the power distribution problem is converted into three optimization steps through an alternating optimization (AO) thought by taking optimization of user power as a target and maximumdelay of a user as a constraint, and the method specifically comprises the steps of(1) fixing a multi-user detection matrix and an IRS passive beamforming variable, and obtaining an optimized power closed-form solution according to a transmission delay constraint; (2) fixing power and passive beamforming variables, and optimizing a multi-user detection matrix to eliminate inter-user interference;and (3) fixing power and a user detection matrix, and proposing a complex circulation waveform optimization (CCMO) algorithm for optimization of IRS beam forming. According to the invention, retransmission time delay caused by channel blocking can be effectively resisted in a low-cost and low-power-consumption mode by utilizing an almost passive IRS auxiliary link, and the proposed algorithm is suitable for being expanded to the problem of large-scale IRS auxiliary power distribution.

Description

technical field [0001] The present invention relates to an uplink power allocation method considering delay limitation in an IRS-assisted multi-user mmWave communication system. To be precise, the scheme aims to minimize the uplink user power in a single-input multiple-output (SIMO) system, and uses the mmWave link and the optimally designed IRS reflective link together to achieve high-speed uplink communication, which belongs to The field of wireless communication technology. Background technique [0002] In the fifth-generation mobile network (5G), mmWave communication is regarded as a key technology to provide gigabit data rates, which is expected to support unprecedented low-latency services in the Internet of Things, but also needs to target long-range coverage and low-power communication The device proposes a solution. mmWave emerges as an attractive solution to meet the stringent latency and power consumption requirements of processing tasks performed in IoT mobile ...

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Application Information

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IPC IPC(8): H04W52/14H04W52/24H04W52/34H04B7/06
CPCH04W52/146H04W52/241H04W52/343H04B7/0626H04B7/0617H04B7/04013
Inventor 吕铁军曹亚帅
Owner BEIJING UNIV OF POSTS & TELECOMM
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