| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 104 === Cooperative communication is a simple but effective scheme that can reduce outage probability and power consumption for next-generation green wireless networks. However, in cooperative networks, the assumption that all users of a wireless network would be willing to help transmit is not realistic. Based on this, our laboratory’s previous work proposed a reputation auction game to stimulate users to perform cooperative transmission via the concept of indirect reciprocity. However, the simulation and analysis results indicated that the performance of multiple-relay cooperation scheme was not better than single-relay scheme, neither in outage probability or energy consumption.
Accordingly, we proposed a cooperation scheme by exploiting virtual beamforming to improve the performance in multiple-relay transmission scheme. Virtual beamforming is a multiple-input single-output (MISO) system which utilizes multiple relays to form a beam. It became feasible because of the progress of channel estimation technology. Based on virtual beamforming, a simple relay selection algorithm was designed to allocate reputation and power. To achieve higher performance, two adaptive and dynamic power algorithms were also proposed. Finally, we compared our auction game with previous work via computer simulation. The simulation results demonstrated that the proposed scheme outperforms previous work. The results have also shown that cooperative communication networks can benefit from virtual beamforming technology and our auction game is both reliable and energy saving.
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