| 摘要: |
| 为了提高检测性能和频谱资源利用率，对认知无线电网络中的周期性协作频谱感知
机制进行了研究。针对不同的衰落信道环境，通过引入有效传输时长比例和干扰时长比例作
为次用户服务质量的衡量标准，给出了集中式协作感知下的检测时长、数据传输时长以及协
作用户数量等参数的最优选取方法，从而获得最高的信道效率。仿真结果表明，通过选取最
佳的协作感知机制参数，可在保证系统检测性能和干扰容限要求的同时，显著提高次用户在
空闲信道的有效传输时长比例，实现了频谱利用效率的最大化。 |
| 关键词: 认知无线电 频谱感知 协作感知 感知机制 检测时长 传输
时长 |
| DOI： |
|
| 基金项目:国家高技术研究发展计划(863计划)项目(2009AAJ208,2009AAJ1
16) |
|
| Optimization of Periodic Cooperative Spectrum Sensing Mechanisms |
| GUO Yun-wei,LIU Quan,GAO Jun |
| (Department of Communication Engineering,Naval University of Engineering,Wuhan
430033,China) |
| Abstract: |
| Periodic cooperative spectrum sensing mechanisms in cognitive radio（CR） ne
tworks are investigated to improve the performance of detection and the efficien
cy of spectrum utilization. The algorithms are proposed in different fading envi
ronment to obtain the optimal mechanism parameters such as detection duration,
data transmission duration and the number of cooperative users, by adopting the
ratio of effective and noneffective transmission duration as the criterion of
the quality of service of secondary users. The simulation results show that the
proposed scheme can increase the ratio of effective transmission duration signi
ficantly and maximize the channel efficiency for the CR users while satisfying t
he detection performance and interference constraints. |
| Key words: cognitive radio(CR) spectrum sensing cooperative sensing sensing mechanis
m detection durati
on transmission duration |
