摘要
文中构建了一种基于协作频谱感知的多天线频谱共享模型,为提高系统传输性能,采用了放大转发(AF)中继方式进行通信传输。文中提出的模型由一组多输入多输出主用户和多组多输入多输出认知用户构成。当认知用户需要进行通信时,其他认知用户暂时充当感知节点对主用户进行协作能量检测;若主用户未占用信道,认知用户立刻以最大发射功率进行通信;若主用户占用信道,认知用户以及中继节点需要限制自身的功率以保证对主用户的干扰在门限值以下,同时调整功率的分配使得认知通信性能最优。文中在找出最优感知时间的基础上研究了认知用户及中继节点的最优功率分配算法,并且分析讨论了不同天线数目以及不同中继数目对系统性能的影响。仿真结果表明,中继数目不能够无限制的增加,对中继节点进行一定数目的选择后进行传输效果会更佳。
A spectrum-sharing model with Multi-Input Multi-Output （MIMO） based on cooperative spectrum sensing is proposed in this paper. In order to promote the transmission function,adopt the way of Amplify and Forward （AF） relay to transmit data. The proposed model consists of an MIMO Primary User （ PU ） pair and an MIMO Secondary User （SU） pair. When SU wants to transmit data, the oth- er SUs will play a role of sensing node to be cooperative to energy detection temporarily. If the licensed band is empty, then SU will trans- mit data with maximum power. If PU occupies the band, SUs and relay nodes need to limit the power to ensure avoiding interference to PU. At the same time, SUs need to adjust the power distribution to make communication performance optimization possibly. Allocating power is based on finding the optimal sensing time in this paper. Also discuss the impact of the different number of antennas and the number of relaying. Simulation results show that the number of repeaters cannot be unlimited increase, relay node selection for transmission wouM be more effective for a certain number.
出处
《计算机技术与发展》
2015年第11期218-220,F0003,共4页
Computer Technology and Development
基金
中国博士后科学基金项目(2013M531393)
国家级大学生创新创业训练计划项目(201410293003)
江苏省博士后科研资助计划项目(1102102C)
江苏省高等学校大学生创新创业训练计划立项项目(201410293003Z)
南京邮电大学大学生创新训练计划项目(SZDG2014003)
