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Volume 33 Issue 10
Nov.  2011
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Zhang Wei-Liang, Zheng Bao-Yu, Yue Wen-Jing. Joint Optimization of Cooperative Threshold and Power Based on Cooperation Level in Cognitive Radio Networks[J]. Journal of Electronics & Information Technology, 2011, 33(10): 2322-2327. doi: 10.3724/SP.J.1146.2011.00263
Citation: Zhang Wei-Liang, Zheng Bao-Yu, Yue Wen-Jing. Joint Optimization of Cooperative Threshold and Power Based on Cooperation Level in Cognitive Radio Networks[J]. Journal of Electronics & Information Technology, 2011, 33(10): 2322-2327. doi: 10.3724/SP.J.1146.2011.00263

Joint Optimization of Cooperative Threshold and Power Based on Cooperation Level in Cognitive Radio Networks

doi: 10.3724/SP.J.1146.2011.00263
  • Received Date: 2011-03-21
  • Rev Recd Date: 2011-07-13
  • Publish Date: 2011-10-19
  • Cooperative transmission for cognitive radio networks not only enhances the anti-fading capability of the system, but also improves the bandwidth efficiency. But its really a worth considering issue when the relay node should assit the source node to transmit information. This paper proposes a cooperative guideline based on cooperative level. Firstly the notion of cooperative level is defined, then the expressions of system bandwidth utilization and the average symbol error rate are deduced, finally the system performance function is got through the compromise between the coorperative thresholds and power ratio. This paper also employs particle swarm optimization algorithm to solve optimal cooperative threshold and optimal power ratio. The simulation results verify the performance of the proposed scheme and show that good link state from source node to destination node and cooperative transmission by the relay node are both useful for optimizing the system performance.
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