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Maximizing and speed rate pre-coding method for simultaneous wireless information and power transfer system

A technology for wireless energy-carrying communication and precoding, which is applied in the field of wireless energy-carrying communication system maximization and rate precoding, and can solve problems such as non-maximizing objective functions and complex mathematical problems.

Active Publication Date: 2015-03-04
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] However, due to the transformation of the objective function, the optimized result only maximizes the transformed objective function, and does not maximize the original objective function
Therefore, the performance of this method still needs to be improved, but because the global optimization method involves very complex mathematical problems, generally only other methods are discussed

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  • Maximizing and speed rate pre-coding method for simultaneous wireless information and power transfer system
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  • Maximizing and speed rate pre-coding method for simultaneous wireless information and power transfer system

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[0031] 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.

[0032] see figure 1 , first introduce the application scenario of the method of the present invention: a communication system including a base station and multiple users, the users are divided into two categories, one of which receives signals, and the other part is used to receive energy; any user cannot receive signals and energy at the same time, and A signal receiver uses all the energy it receives to decode the information. The solid line in the figure represents information transmission, and the dashed line represents energy transmission. The base station first obtains all channel state information H 1 ,...,H k , where H i Indicates the channel matrix from the base station to the information receiver, H j Indicates the channel matrix from the base stati...

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Abstract

The invention discloses a maximizing and speed rate pre-coding method for a simultaneous wireless information and power transfer system. The maximizing and speed rate pre-coding method for the simultaneous wireless information and power transfer system includes that acquiring all the channel state information through a base station, and building an optimizing model aimed to optimize information users and speed rate. The operation for the iterative optimization of pre-coding matrix includes steps that (1) initializing, to be specific, converting a target function into a convex function through first approximation, wherein at the moment, the information user maximization and speed rate problem is a convex problem under the constraints of sending power and energy user receiving power; setting a sending signal covariance matrix as a zero matrix to solve the problem; (2) iterating, to be specific, substituting the sending signal covariance matrix obtained through solving the optimization problem into the target function, and continuing to solve till realizing information user and speed rate convergence. The theory proves that the maximizing and speed rate pre-coding method for the simultaneous wireless information and power transfer system is globally optimal in performance, compared with an existing method, the maximizing and speed rate pre-coding method for the simultaneous wireless information and power transfer system converts the problem into the convex problem through gradual convex approximation to solve. By means of the pre-coding method, the information user and speed rate of the simultaneous wireless information and power transfer system can be effectively improved.

Description

technical field [0001] The invention relates to a method for maximizing and rate precoding of a wireless energy-carrying communication system, to be precise, a method for better utilizing frequency spectrum and energy resources for communication and energy transmission, and belongs to the technical field of wireless communication. Background technique [0002] Energy harvesting based on radio signals from the surrounding environment is a promising new technology that could provide cheap and fast energy. In recent decades, many institutions have carried out fruitful research aimed at wireless transmission of energy. If the technology matures, it can replace wired energy transmission to save resources, and even transmit energy back to the earth from artificial earth satellites. The industry has accumulated several related technologies. [0003] On the other hand, radio signals have long been widely used in wireless communication, which provides great convenience to human lif...

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Application Information

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IPC IPC(8): H04L1/00
CPCH04B7/0426H04B7/0456H04L1/0002H04W52/262H04W52/267
Inventor 高晖吕铁军岳朝辉
Owner BEIJING UNIV OF POSTS & TELECOMM
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