摘要
在机会频谱接入认知无线电系统中,认知用户只有在通过感知确定信道空闲时才可以接入授权信道,因此频谱感知对于系统性能影响非常重要。提出了基于新帧结构的四元频谱感知模型,考虑主用户活跃性对认知网络吞吐量的影响,采用可同时最大化感知和数据传输时间的新帧结构模型,不需要考虑感知和吞吐量的均衡。理论分析新模型下感知时间、主用户活跃性、目标检测概率以及主用户接收信噪比对系统吞吐量的影响,并与传统模型进行了对比。
In a cognitive radio network that employs opportunistic spectrum access, cognitive user can access the licensed frequency band only when it is detected to be idle by spectrum sensing. Hence spectrum sensing is of great importance to system performance, In this paper, a new quaternary spectrum sensing model is proposed based on new frame structure. In this model the effect of the primary user traffic on the performance of the secondary net- work is taken into account and employs a new frame structure model that overcomes the sensing-throughput tradeoff by performing spectrum sensing and data transmission at the same time, which maximizes both the sensing time and data transmission time. The effect of the primary user traffic, target detection probability and SNR on the performance of the secondary network is discussed and compared with the conventional model. Finally, simulation results are provided to verify the theoretical analysis.
出处
《电视技术》
北大核心
2013年第23期130-134,共5页
Video Engineering
基金
国家自然科学基金项目(60702020)
关键词
认知无线电
主用户活跃性
频谱感知
机会频谱接入
吞吐量最大化
cognitive radio
primary user traffic
spectrum sensing
opportunistic spectrum access
maximize throughput
