Abstract
As a cellular network of the fifth generation (5G) is commercialized, mobile devices and data throughput have rapidly increased. According to the spatial density for communication increases, the nodes of cell are overloaded. Therefore, the heterogeneous ultra dense network (UDN) is suggested. Furthermore, the techniques for selecting a relay have been proposed in the Heterogeneous Net (HetNet). The relays are needed to improve communication performance and mitigate overload of nodes. In this paper, an adaptive relay selection scheme is proposed to obtain the diversity gain from multiple relays. To enhance the reliability of communication, the proposed scheme suggests a new algorithm considering outage probability and diversity gain of compound channel. Furthermore, the selected relays use an antenna selection algorithm to improve the channel capacity. Simulation results show that the proposed scheme improves the bit error rate (BER) and the data throughput.
Highlights
With the increase in the use of multimedia services such as mobile video and audio, traffic for communication is generated
This paper proposes an adaptive relay selection scheme to obtain the diversity gain through the optimal compound channel
As one of the relay selection techniques, the proposed scheme uses a new algorithm for enhancing the performance of single link
Summary
With the increase in the use of multimedia services such as mobile video and audio, traffic for communication is generated. The heterogeneous UDN improves spectral efficiency by increasing the network capacity per unit area of the cell [5] It distributes mobile traffic and satisfies 5G performance requirements such as user quality of service (QoS), quality of experience (QoE), lower latency and power consumption [6,7]. Due to the difficulty of backhaul connections and the interaction between relays, researches on single hop have been studied actively to improve the performance of single link as an alternative of complex multi-hop systems [24,25]. This paper proposes an adaptive relay selection scheme to obtain the diversity gain through the optimal compound channel.
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