CAJ | 학술논문

首先建立了非对称信道下协作系统的数学模型,考虑了源节点到目的节点的直通链路,利用特征函数法推导出协作系统的平均中断概率公式,通过仿真验证了该中断概率公式的精确性,理论和仿真都表明协作系统的中断概率和中继节点的个数、位置分布以及协作系统的功率分配因子有着密切关系,并且考虑源到目的节点的直通链路相对于不考虑直通链路的情况具有更高的性能增益;然后又在此公式基础卜就协作系统中继节点的位置分布对最优功率分配因子的影响进行了仿真分析,并指出协作系统的最优功率分配因子受制于中继节点的位置分布情况.
수선건립료비대칭신도하협작계통적수학모형,고필료원절점도목적절점적직통련로,이용특정함수법추도출협작계통적평균중단개솔공식,통과방진험증료해중단개솔공식적정학성,이론화방진도표명협작계통적중단개솔화중계절점적개수、위치분포이급협작계통적공솔분배인자유착밀절관계,병차고필원도목적절점적직통련로상대우불고필직통련로적정황구유경고적성능증익;연후우재차공식기출복취협작계통중계절점적위치분포대최우공솔분배인자적영향진행료방진분석,병지출협작계통적최우공솔분배인자수제우중계절점적위치분포정황.
Firstly, a mathematical model of cooperative system in asymmetric channel considering the link diversity gain between the source and destination was presented. An analytical expression of the average outage probability which was proved accurate by simulation was derived by using the method of characteristic function. Theory and simulation indicate that the outage probability of the cooperative system has a close relationship with the relays' number, location and the power allocation ratio of the cooperative system and it makes higher performance gain to consider the direct link between the source and the destination. And then the effect of the relay nodes location for the optimal power allocation ratio was studied based on the mathematical model. The results show that the optimal power allocation ratio is limited by the relays' locations.