Energy Efficiency Optimization Method in Asymmetric Two-way Relay System

Abstract

The invention discloses an energy efficiency optimization method in an asymmetric bidirectional relay system. The method mainly solves the problem that the existing optimum power distribution method is low in energy efficiency. The technical solution comprises: obtaining the summation rate of two user devices in the asymmetric bidirectional relay system; proposing an initial optimization problem taking the maximum energy efficiency as a target; rewriting the initial optimization problem into a secondary optimization problem according to the rates of the two user devices; converting the secondary optimization problem into an inner layer optimization problem and an outer layer optimization problem, obtaining the optimum solutions of the inner layer and outer layer optimization problems; finally, obtaining the optimum power distribution of the two user devices and the relay according to the optimum solutions of the inner layer and outer layer optimization problems. According to the invention, an existing circuit consumption power model is completed; the energy efficiency optimization method is low in calculation complexity and simple in realization and can be applicable to data transmission in the asymmetric bidirectional relay system.

Description

technical field [0001] The invention belongs to the technical field of mobile communication systems, and in particular relates to a medium energy efficiency optimization method, which can be used in an asymmetric two-way relay system. Background technique [0002] With the gradual rise of the mobile Internet and the Internet of Things, the explosive growth of mobile data traffic and massive device connections have led to rising energy costs and deteriorating ecological environments. Green communication technology has thus attracted much attention. As a green index to measure the energy consumption of communication systems, energy efficiency has become a research hotspot today. In order to overcome the defects of time slot waste and low spectrum efficiency of traditional relay technology, a two-way relay channel TWRC is introduced. In the TWRC system, the two terminal nodes realize data interaction through the relay. When the relay node only amplifies and forwards the receiv...

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Problems solved by technology

The article "Energy-Efficient Relay Selection and Power Allocation for Two-Way Relay Channel with Analog Network Coding" in IEEE Communications Letters, 2012, 16(6): 816-819 by Zhou M et al. proposes an asymmetric two-way relay system Under the condition of the lowest end-to-end transmission rate, the relay selection strategy and power allocation scheme when the total transmission energy consumption is minimized, although this scheme considers the transmission scenarios of bidirectional links and asymmetric transmission rates, it does not consider circuit energy consumption In the actual short-distance transmission scenario, since the circuit energy consumption accounts for the vast majority of the total energy consumption of the system, ignoring the circuit energy consumption will seriously affect the energy efficiency of the communication system, and the sharp drop in energy efficiency is still will cause the communication link to be broken

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