Abstract
The relay selection is a promising approach of maximizing the diversity gain achieved in the cooperative wireless sensor networks. In the cooperative networks, the proper selection of relay node is a challenging task. The proper selection of relay nodes not only improves the source–destination performance, but also maximizes the overall system performance. There are many factors involved in designing a relay selection algorithm. The different relay selection algorithms have different focus, criteria, objective, mechanism, and performance issues. In this article, several relay assignment algorithms have been analyzed to show the effectiveness of channel capacity, power allocation, coverage expansion and interference mitigation in term of proper relay selection schemes. Moreover, this paper discusses some relay selection schemes, their challenging issues, limitations, performance criteria, and mechanisms. This article also highlights the significant design issues of relay selection methods and compares them that are appropriate in the cooperative wireless sensor networks.
Highlights
In the cooperative wireless sensor networks, the data rate of the wireless channel is improved selecting the best relay node in the networks
The senders or receivers are able to choose the cooperative node at any given time [6]. Both relay selection mechanisms can be categorized by a number of relay nodes that an user communicates
Relay selection using machine learning: The work done in [28,29] apply machine learning techniques such as deep enforcement learning and artificial neural network to select the relay node in multi-hop wireless network
Summary
In the cooperative wireless sensor networks, the data rate of the wireless channel is improved selecting the best relay node in the networks. The AF techniques amplify the signal received by the relay and forward the signal to the destination node. One of the major drawback of the AF mode is that the relay node amplifies the noise of the signal with the data and the destination node receives two independently faded versions of signal. In DF method, the relay nodes, which have error correcting technique, require much computing power Another method is coded cooperation in which the received data bits are broken down into two parts. In this diagram, sensor s, d, and r work as source, destination, and relay node, respectively. An improper relay node selection could make the capacity under cooperative communications less than direct transmissions. This article highlights the design issues of relay selection methods and compares them
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