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SAR constrained energy efficiency maximization multi-user MIMO uplink precoding method

A multi-user, precoding technology, applied in the field of communication, can solve problems such as difficulty in obtaining instantaneous channel state information, instant channel state information is easily outdated, etc., to improve transmission robustness, reduce EM radiation, reduce complexity and overhead Effect

Active Publication Date: 2021-01-15
SOUTHEAST UNIV
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Problems solved by technology

Generally, the maximum tolerated dose of SAR for partial body exposure is limited to less than 1.6W / kg
[0003] Traditional wireless communication transmission optimization problems are often based on instantaneous channel state information, but it is difficult to obtain instantaneous channel state information, and in fast time-varying channels, instantaneous channel state information is easily outdated

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Embodiment Construction

[0020] The present invention will be further explained below in conjunction with the accompanying drawings.

[0021] A SAR-constrained energy efficiency maximizing multi-user MIMO uplink precoding method of the present invention is described in conjunction with specific scenarios, including the following steps:

[0022] 1) Multi-user MIMO uplink propagation scenario

[0023] Consider the multi-user MIMO uplink propagation scenario, the base station is configured with M antennas, there are K user terminals in the cell, and the set of users is Each user configures N k root antenna. is the channel matrix from the kth user to the base station, means M×N k The complex domain matrix of , considering the joint correlated Rayleigh fading channel model, then H k Expressed as in is the statistical eigenmode domain channel matrix from the kth user to the base station, U k and V k is a deterministic unitary matrix, (.) H Represents the conjugate transpose operation of a mat...

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Abstract

The invention discloses an SAR (Synthetic Aperture Radar) constrained energy efficiency maximization multi-user MIMO (Multiple Input Multiple Output) uplink precoding method. In the method, maximization of system energy efficiency is taken as a target, a sending signal covariance matrix of each user in multi-user MIMO uplink transmission is designed by utilizing statistical channel state information, and meanwhile, the constraint of the maximum sending power and the constraint of an electromagnetic wave absorption ratio SAR are met. The energy efficiency maximization algorithm design mainly utilizes a deterministic equivalence principle, Dinkelbach transformation and an iterative water injection algorithm to obtain an optimal sending signal covariance matrix. When the channel state information is changed, the user side dynamically implements the energy efficiency maximization multi-user MIMO uplink transmission method meeting the SAR constraint. According to the method, on the premiseof meeting SAR constraints, the energy efficiency value of multi-user MIMO uplink transmission can be effectively improved, and the implementation complexity of wireless transmission can be remarkablyreduced.

Description

technical field [0001] The invention belongs to the field of communication, and in particular relates to an energy efficiency maximizing multi-user MIMO uplink transmission method using SAR constraints of statistical channel state information. Background technique [0002] Portable and wearable devices are widely used in wireless communication, but these devices generate electromagnetic (EM) signals during operation, emit EM radiation, and pose potential health threats to nearby users during use. Therefore, all wireless devices must comply with EM exposure limits. Specific Absorption Rate (SAR) is a generally accepted measure of consumer EM exposure. SAR measures the energy absorbed per unit mass of human tissue in W / kg. Generally, the maximum tolerated dose of SAR for partial body exposure is limited to below 1.6W / kg. [0003] Traditional wireless communication transmission optimization problems are often based on instantaneous channel state information, but it is diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04B7/0426H04B7/0456
CPCH04B7/0413H04B7/0426H04B7/0456Y02D30/70
Inventor 尤力熊佳媛黄雨菲姜涵予徐洁任德荣王闻今
Owner SOUTHEAST UNIV
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