Optimal relay selection method and device

Abstract

The embodiment of the invention provides an optimal relay selection method and apparatus, applied to a wireless energy collection type relay transmission system, wherein the relay transmission system comprises a source node, a destination node and a plurality of relay nodes. The method comprises the following steps: for each relay node, calculating a power allocation coefficient on the relay node, allocating the power from the source node received by the relay node according to the power allocation coefficient, so that the relay node performs decoding, obtaining decoding results of the plurality of relay nodes, judging whether the decoding results are correct, if so, storing the relay nodes corresponding to the decoding results in a set, and selecting the relay node having the maximum signal to noise ratio of a link from the relay node to the destination node in the set as the optimal relay to perform information forwarding. The optimal relay selection method and apparatus provided by the invention is realized on the basis of the dynamic power allocation on the relay nodes, the energy utilization rate can be effectively improved on the premise of ensuring the performance of the existing communication system, and the environmental protection of the communication system is realized.

Description

Technical field [0001] The present invention relates to the technical field of cooperative communication, and in particular to an optimal relay selection method and device. Background technique [0002] According to the inventor’s research, the existing wireless energy harvesting relay networks (Energy Harvesting Cooperative Networks, EHCN for short) usually adopt the Max-Min criterion for relay selection. However, the problem with the MaxMin relay selection algorithm lies in the fixed energy harvesting / Information transmission power allocation ratio may cause some relay nodes to have too low decoding energy due to channel depth fading, causing the link between the source node S and the relay node R to be interrupted, which in turn leads to a significant increase in the global interruption probability. How to solve this technical problem has become a research hotspot for those skilled in the art. Summary of the invention [0003] In view of this, the present invention provides a...

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Problems solved by technology

[0002] The inventors found that the existing wireless energy harvesting relay network (Energy Harvesting Cooperative Networks, referred to as EHCN) usually uses the Max-Min criterion for relay selection, but the problem with the MaxMin relay selection algorithm is that the fixed energy harvesting / Information transmission power allocation ratio may lead to low decoding energy of some relay nodes due to deep channel fading, causing link interruption between the source node S and the relay node R, which in turn leads to a significant increase in the overall interruption probability, so , how to solve this technical problem has become a research hotspot for those skilled in the art

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