Energy efficiency optimization algorithm of multi-user OFDM relay system

A relay system and energy-efficient technology, applied in the field of communication, can solve problems such as limiting the optimality of algorithms and lack of optimality

Inactive Publication Date: 2016-06-29
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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Problems solved by technology

Since the two subproblems that should interact with each other are solved independently, the resulting solution lacks optimality
And when taking the time average, the previous time window will be used to approximate the current time window. The error caused by this approximation also limits the optimality of the algorithm.

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  • Energy efficiency optimization algorithm of multi-user OFDM relay system
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Embodiment Construction

[0087] Referring to the accompanying drawings, through the description of the embodiments, the specific embodiments of the present invention include the shape, structure, mutual position and connection relationship of each part, the function and working principle of each part, and the manufacturing process of the various components involved. And the method of operation and use, etc., are described in further detail to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions of the present invention.

[0088] Such as figure 1 As shown, consider such a two-hop OFDM single-relay network, the base station sends information to K users through a single relay. The communication mode adopts TDD mode, and the whole process is divided into two time slots: in the first time slot, the source node S broadcasts the information to be sent to the destination node and all relay nodes; in the second time slot, all ...

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Abstract

The invention discloses an energy efficient optimization algorithm of a multi-user OFDM relay system. On the premise of satisfying the minimum transmission rate of the system, a strategy that a source still sends data at a TS2 is adopted so as to provide a diversity gain; and a system energy efficiency optimization model containing subcarrier pairing and power allocation is constructed. The model is a typical nonlinear mixed integer programming problem; this kind of problem is generally solved very complexly; by defining an equivalent channel gain, the complex optimization problem is simplified into a quasi convex programming problem; an optimum solution is solved by using a Dinkelbach method, a Hungary algorithm and a sub-gradient algorithm; the computing complexity is greatly reduced; and a simulation result shows that through adoption of the algorithm provided by the invention, under a condition of satisfying the demand of the system for the minimum transmission rate, the energy efficiency of the system is improved; and good global convergence is realized.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an energy efficiency optimization algorithm of a multi-user OFDM relay system. Background technique [0002] In recent years, people's demand for high-speed network data transmission is increasing, which brings more and more energy consumption. Limited by the size of mobile devices and the development bottleneck of battery technology, energy efficiency in mobile communications has received more and more attention. At the same time, it is reported that 9% of global carbon dioxide emissions are produced by information and communication technology (ICT), of which 50% of energy consumption is brought by wireless access, so the research on energy efficiency in mobile communication is of great importance The development of green communication and the mitigation of the global greenhouse effect also have a major impact. For this reason, around the energy efficiency pr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/26H04W52/34H04W52/46H04L5/00
CPCH04W52/267H04L5/0007H04W52/346H04W52/46
Inventor 梁广俊
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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