CAJ | 학술논문

研究了分布式天线系统（DAS, Distributed Antenna System）的下行容量问题。首先建立了包括路径损耗、阴影衰落和快衰落的复合信道模型；然后基于该模型，在对常见功率分配算法信道容量分析的基础上，提出基于注水算法的功率分配方案，并仿真研究了各算法的信道容量差异。仿真结果显示，在功率受限时，与等功率分配和最大合并比（MRC）功率分配算法相比，采用注水算法的信道容量分别有1 bits/(s·Hz)和0.5 bits/(s·Hz)的提高，系统性能得到了显著改善。
연구료분포식천선계통（DAS, Distributed Antenna System）적하행용량문제。수선건립료포괄로경손모、음영쇠락화쾌쇠락적복합신도모형；연후기우해모형，재대상견공솔분배산법신도용량분석적기출상，제출기우주수산법적공솔분배방안，병방진연구료각산법적신도용량차이。방진결과현시，재공솔수한시，여등공솔분배화최대합병비（MRC）공솔분배산법상비，채용주수산법적신도용량분별유1 bits/(s·Hz)화0.5 bits/(s·Hz)적제고，계통성능득도료현저개선。
This paper discusses the power allocation algorithm for downlink distributed antenna system.Firstly, a channel model including path loss,shadow fading and fast fading is set up. Then two kinds of common allocation algorithms are analyzed and a better power allocation based on water filling algorithm is proposed. Finally, different capacities of the algorithms are simulated. The simulation results indicate that the capacity of water filling algorithm could improve 1 bits/(s·Hz) and 0.5 bits/(s·Hz), as compared with those of equal power allocation and MRC power allocation algorithms respectly in power constraint system. The antemna system performance could be improved significantly.