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Sum-Power Minimization in Multiuser Single-DF-Relay Networks with Direct Links

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  • Shiguo Wang
  • Haixia Peng
  • Xianru Liu

Abstract

Forming cooperation through relay's assistance is a promising method to realize green communication by reducing transmission power. In this paper, for multiuser single-DF-relay wireless networks with direct links, the optimal power allocation strategy that minimizes system-sum-power consumption is investigated. Based on the principle that minimizing system-sum-power consumption is equivalent to maximizing system energy efficiency, users are classified into two parts after comparing the channel gains between source-destination link and relay-destination link. The optimal power allocation strategy of one part is determined directly, and minimizing the system-sum-power consumption of the other part is converted into minimizing source-sum-power consumption, which can be solved easily through Karush-Kuhn-Tucker (KKT) condition. Through numerical simulations, we further justified the effectiveness of our scheme compared to existing works.

Suggested Citation

  • Shiguo Wang & Haixia Peng & Xianru Liu, 2016. "Sum-Power Minimization in Multiuser Single-DF-Relay Networks with Direct Links," International Journal of Distributed Sensor Networks, , vol. 12(4), pages 8467294-846, April.
    • Handle: RePEc:sae:intdis:v:12:y:2016:i:4:p:8467294
    DOI: 10.1155/2016/8467294
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