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Dual-time scale optimization method in reconfigurable intelligent surface-assisted MIMO transmission based on outdated CSI

A time-scale, large-time technology, applied in transmission systems, radio transmission systems, space transmit diversity, etc., can solve problems such as reducing spectrum utilization, interference between signal streams, and difficulty in obtaining I-CSI.

Pending Publication Date: 2022-04-08
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Cascaded channel estimation related to IRS has been extensively studied and achieved important progress, however, it is difficult for BS to obtain perfect I-CSI due to the non-negligible feedback delay, especially in time division duplex (TDD) systems middle
BS applies mature precoding techniques such as singular value decomposition (SVD) based on outdated CSI, which will lead to serious interference between signal streams
[0004] On the other hand, the non-negligible overhead in the IRS configuration can seriously reduce the spectrum utilization

Method used

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  • Dual-time scale optimization method in reconfigurable intelligent surface-assisted MIMO transmission based on outdated CSI
  • Dual-time scale optimization method in reconfigurable intelligent surface-assisted MIMO transmission based on outdated CSI
  • Dual-time scale optimization method in reconfigurable intelligent surface-assisted MIMO transmission based on outdated CSI

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] see figure 1, the application scenario of the present invention is: deployed IRS enhanced communication between a BS equipped with multiple antennas and a user equipment. Line of sight (LoS) communication between IRS and BS. The channels from the IRS to the user equipment and from the BS to the user equipment are subject to Lai fading, where the LoS component is the known statistical CSI and remains constant in a time frame; the unknown non-line-of-sight (NLoS) component is subject to the first-order automatic The regression process is time dependent. The BS can acquire all the CSI through the time division duplex (TDD) protocol by utilizing channel reciprocity, but there is a CSI feedback delay. According to I-CSI and statistical CSI, the BS is based on...

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Abstract

The invention provides a dual-time-scale beamforming method for a reconfigurable intelligent surface (IRS)-assisted MIMO system, and the method carries out the relatively infrequent configuration of the IRS on the basis of statistical channel state information (CSI) on a large time scale, and carries out the frequent updating of the power distribution of a base station (BS) on the basis of outdated CSI on a small scale. The method specifically comprises the steps that a transmission structure for overcoming outdated CSI is designed on a small scale, a particle swarm optimization (mbs-PSO) algorithm based on small-batch sampling is provided on a large scale by utilizing a closed-form solution for obtaining optimal small-scale power distribution, and large-scale IRS configuration is predictively optimized under the condition that channel sampling is reduced. According to the invention, a dual-time-scale transmission scheme of IRS-assisted MIMO is adopted, inter-signal-flow interference caused by outdated CSI can be effectively resisted, and the algorithm does not need excessive cascade channel estimation and IRS configuration overhead in a fast time-varying channel.

Description

technical field [0001] The invention relates to a dual-time-scale design method in an IRS-assisted MIMO communication system. To be precise, the scheme considers the outdated effect of actual channel estimation, designs an improved transceiver structure for outdated CSI, and aims at maximizing the average achievable rate, and jointly optimizes the long-term IRS configuration and short-term power allocation , belonging to the field of wireless communication technology. Background technique [0002] In order to meet the demand for high data rates in mobile communications, MIMO technology is proposed in 5G to support high spectral efficiency. IRS has been identified as an attractive complementary technology to MIMO systems to improve spectral efficiency and energy efficiency. Since IRSs are mainly composed of low-cost passive metamaterial elements, they can be densely deployed with existing MIMO systems to substantially increase spectral efficiency in a cost-effective manner....

Claims

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Application Information

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IPC IPC(8): H04B7/0413H04B7/0426H04B7/0456H04B7/06G06N3/00
Inventor 吕铁军曹亚帅
Owner BEIJING UNIV OF POSTS & TELECOMM
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