ChinaCom2008-Wireless Communications and Networking Symposium

Research Article

Selective Cooperation Based on Overall Power Minimization in Wireless Networks

  • @INPROCEEDINGS{10.1109/CHINACOM.2008.4685075,
        author={Chao Zhang and Huarui Yin and Weidong Wang and Guo Wei},
        title={Selective Cooperation Based on Overall Power Minimization in Wireless Networks},
        proceedings={ChinaCom2008-Wireless Communications and Networking Symposium},
        keywords={cooperative communication; power-efficiency; relay selecting},
  • Chao Zhang
    Huarui Yin
    Weidong Wang
    Guo Wei
    Year: 2008
    Selective Cooperation Based on Overall Power Minimization in Wireless Networks
    DOI: 10.1109/CHINACOM.2008.4685075
Chao Zhang1,*, Huarui Yin1,*, Weidong Wang1,*, Guo Wei1,*
  • 1: Dept. Electronic Engineering & Information Science, and Wireless Information Network Lab. University of Science & Technology of China, Hefei, China.
*Contact email:,,,


In this paper, we propose a selective cooperative scheme based on overall power minimization in wireless networks. While cooperation can potentially improve communication quality, this improvement often comes at a price in terms of extra power consumption for protocol overhead and the relaying device running. As such, we contend that it is worthwhile to consider a scheme that satisfies an overall Symbol Error Rate (SER) constraint such that cooperation is only invoked to save power when necessary. We study that issue by looking at the overall power consumptions of cooperative and non-cooperative schemes in a 3-node model. Optimal power allocation strategies under an overall SER constraint are derived for both non-cooperative scheme and DF cooperative scheme. Taking into account overhead power, the scheme with minimum overall consumed power is adopted for a source-destination pair. When cooperative scheme is used, the potential relay leading to minimum overall power is also selected as the best relay. To reduce the complexity of the selective scheme, three geographical parameters, which are used to make decisions in proposed selective scheme, are evaluated. Numerical results show that the selective cooperative scheme is more power-efficient than both non-cooperative scheme and conventional cooperative scheme.