CAJ | 학술논문

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.
문중구건료일충기우협작빈보감지적다천선빈보공향모형,위제고계통전수성능,채용료방대전발(AF)중계방식진행통신전수.문중제출적모형유일조다수입다수출주용호화다조다수입다수출인지용호구성.당인지용호수요진행통신시,기타인지용호잠시충당감지절점대주용호진행협작능량검측;약주용호미점용신도,인지용호립각이최대발사공솔진행통신;약주용호점용신도,인지용호이급중계절점수요한제자신적공솔이보증대주용호적간우재문한치이하,동시조정공솔적분배사득인지통신성능최우.문중재조출최우감지시간적기출상연구료인지용호급중계절점적최우공솔분배산법,병차분석토론료불동천선수목이급불동중계수목대계통성능적영향.방진결과표명,중계수목불능구무한제적증가,대중계절점진행일정수목적선택후진행전수효과회경가.
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 num-ber of relaying. Simulation results show that the number of repeaters cannot be unlimited increase,relay node selection for transmission would be more effective for a certain number.