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J. Electromagn. Eng. Sci > Volume 11(1); 2011 > Article
Journal of the Korean Institute of Electromagnetic and Science 2011;11(1):5-10.
DOI: https://doi.org/10.5515/JKIEES.2011.11.1.005   
Adaptive Decode-and-Forward Cooperative Networks with Multiple Relay Nodes
Ha Nguyen Vu, Hyung-Yun Kong
Department of Electrical Engineering, University of Ulsan
We propose an adaptive cooperative scheme with a multi-relay node that achieves high bandwidth efficiency and achieves better SEP performance. In the proposed protocol, if the quality of the direct channel is better than that of the all channels from relays to destination, the source will transmit directly to the destination. Otherwise, the source broadcasts the signal and then a potential relay will be chosen to help the source. A re-transmission will also occur if the potential relay cannot be detected. The spectral efficiency is first derived by calculating the probability of each mode, i.e., direct and cooperation transmission. Subsequently, the SEP performance of M-PSK modulation for the scheme is analyzed by considering each event where the source transmits data to the destination. Finally, the obtained analytical results are verified through computer simulations.
Key words: Adaptive Cooperation, Sep Performance, Spectral Efficiency, Relay Selection


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