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Performance Analysis of Best Relay Selection in Cooperative Multicast Systems Based on Superposition Transmission

중첩 전송 기반 무선 협력 멀티캐스트 시스템에서 중계 노드 선택 기법에 대한 성능 분석

  • Lee, In-Ho (Department of Electrical, Electronic and Control Engineering, Hankyong National University)
  • Received : 2017.11.16
  • Accepted : 2017.12.07
  • Published : 2018.03.28

Abstract

In this paper, considering the superposition transmission-based wireless cooperative multicast communication system (ST-CMS) with multiple relays and destinations, we propose a relay selection scheme to improve the data rate of multicast communication. In addition, we adopt the optimal power allocation coefficient for the superposition transmission to maximize the data rate of the proposed relay selection scheme. To propose the relay selection scheme, we derive an approximate expression for the data rate of the ST-CMS, and present the relay selection scheme using only partial channel state information based on the approximate expression. Moreover, we derive an approximate average data rate of the proposed relay selection scheme. Through numerical investigation, comparing the average data rates of the proposed relay selection scheme and the optimal relay selection scheme using full channel state information, we show that the proposed scheme provides extremely similar performance to the optimal scheme in the high signal-to-noise power ratio region.

Acknowledgement

Supported by : Hankyong National University

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