| 认知无线电网络自适应带宽分配机制及性能分析 |
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| 引用本文： | 曾志民,刘琦,冯春燕,郭彩丽. 认知无线电网络自适应带宽分配机制及性能分析[J]. 北京邮电大学学报, 2009, 32(1): 39-42 |
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| 作者姓名： | 曾志民 刘琦 冯春燕 郭彩丽 |
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| 作者单位： | 北京邮电大学,信息与通信工程学院,北京,100876;北京邮电大学,信息与通信工程学院,北京,100876;北京邮电大学,信息与通信工程学院,北京,100876;北京邮电大学,信息与通信工程学院,北京,100876 |
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| 摘 要： | 为充分利用认知无线电网络中授权用户未占用的带宽，提出了一种自适应带宽分配机制(ABAM)，采用二维Markov链对认知无线电网络中ABAM机制性能进行了建模分析，得到了带宽利用率等系统性能指标的解析结果.理论分析及仿真结果表明，与传统的固定带宽分配机制相比，ABAM允许认知呼叫根据授权呼叫占用带宽情况自适应调整其传输带宽，可有效地提高系统的带宽利用率.
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| 关 键 词： | 认知无线电网络 自适应带宽分配 Markov链 拟生灭过程 带宽利用率 |
| 收稿时间： | 2008-06-25 |
| 修稿时间： | 2008-09-08 |
An Adaptive Bandwidth Allocation Mechanism and Performance Analysis in Cognitive Radio Networks |
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| ZENG Zhi-min,LIU Qi,FENG Chun-yan,GUO Cai-li. An Adaptive Bandwidth Allocation Mechanism and Performance Analysis in Cognitive Radio Networks[J]. Journal of Beijing University of Posts and Telecommunications, 2009, 32(1): 39-42 |
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| Authors: | ZENG Zhi-min LIU Qi FENG Chun-yan GUO Cai-li |
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| Affiliation: | School of Information and Communication Engineering;Beijing University of Posts and Telecommunications;Beijing 100876;China |
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| Abstract: | An adaptive bandwidth allocation mechanism (ABAM) is proposed to make full use of the bandwidths not occupied by the license users. Two-dimensional Markov chain is used to analyze the performance of ABAM in cognitive radio(CR) networks. The measurements such as the channel utilization are analytically obtained. Theoretical analysis and simulation show that the ABAM, which allows the CR calls to adaptively adjust their transmission bandwidth according to the occupied bandwidth of license calls, will effectively improve the channel utilization of the system as compared with the fixed bandwidth allocation mechanism. |
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| Keywords: | cognitive radio networks adaptive bandwidth allocation Markov chain quasi birth and death process bandwidth utilization |
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