Relay selection method of energy acquisition based multi-relay cooperative communication system

Abstract

The invention discloses a relay selection method of an energy acquisition based multi-relay cooperative communication system, and belongs to the technical field of cooperative communication. The relay selection method comprises steps of analyzing a system scene and summarizing problems; establishing a system mathematical model; and using an optimization method to solve an optimal solution. The relay selection method provided by the invention is practically applied in special application scenes, so compared with previous multi-relay selection methods, the relay selection method is characterized in that multi-relay cooperative communication based on energy acquisition is taken into consideration, and an expression of the throughput capacity is deduced, so the throughput capacity performance among communication nodes is maximized, solving of optimization problems is performed and the relay selection method has practical guidance meanings. Aiming at the solving of the optimization problem, convex optimization processing is adopted and a target function of an optimization problem is converted without approximate calculation, so precision of the problem is not affected, calculation complexity is greatly reduced, and time delays generated by expense of the system are reduced. During an optimization process, a lagrangian multiplier method is adopted, so optimization speed is fast. A subgradient method is adopted in an algorithm iteration process, and gradual step lengths are selected, so optimization is more accurate.

Description

technical field [0001] The invention belongs to the technical field of cooperative communication, and more specifically relates to a relay selection method of an energy harvesting multi-relay cooperative communication system. Background technique [0002] In 1979, Cover and Gamal mentioned the cooperative communication model for the first time in their research on relay channels. They studied the channel capacity of the AWFN relay communication network model composed of active, relay and destination nodes. All the nodes work in the same frequency band, thus dividing the system into a broadcast channel and a multiple access channel. Then the research on cooperative communication is basically based on this. Compared with direct communication, cooperative communication can provide space diversity gain and realize high-speed and high-reliability data transmission for target users. A key issue in cooperative communication is how to allocate and manage relay nodes. Although a si...

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Problems solved by technology

[0011] Aiming at the problems that the existing cooperative communication system relay selection method does not fully consider the performance improvement brought about by energy harvesting factors, the joint relay selection under the condition of energy causal constraints, and the practical application of low-complexity algorithms, the present invention proposes an energy harvesting The relay selection method of multi-relay cooperative communication system, the joint relay selection under the comprehensive consideration of energy causal constraints, combined with the energy-saving solution brought by energy harvesting technology, assists low-complexity iterative algorithms, and maximizes the network performance between communication users

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