| 封面及目录.封面及目录[J].高技术通讯(中文),2013,23(9):883~887 |
| 封面及目录 |
| A centralized spectrum allocation strategy based on super slots for cognitive radio networks and its performance analysis |
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| DOI： |
| 中文关键词: 封面及目录 |
| 英文关键词: cognitive radio network,spectrum allocation,centralized control,super slot,Markov model |
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| 中文摘要: |
| 封面及目录 |
| 英文摘要: |
| Letting primary users access spectrum with preemptive priority at the boundary of a super slot,cognitive users transmit their data packets in a slot structure,a novel centralized spectrum allocation strategy for cognitive radio networks is proposed.Combining the sequence number of the current slot in a super slot and the number of data packets for the cognitive users in the system,a two dimensional Markov chain model is established.By using the method of matrix geometry solutions,the system model in steady state is analyzed,and the performance measures for the cognitive users,such as the throughput,the average latency of data packets and the spectrum switching ratio,are given accordingly.The experimental results show that the new centralized spectrum allocation strategy can improve the throughput,lower the spectrum switching ratio.Considering the trade off between different performance measures,a profit function is constructed to optimize the number of slots in a super slot. |
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