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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。
The downlink capacity of Distributed Antenna System (DAS) is studied. Firstly, a composite channel model including path loss, shadow fading and fast fading is established. Based on this model, the power allocation scheme based on water flooding algorithm is proposed based on the analysis of channel capacity of common power allocation algorithm. Channel capacity difference. The simulation results show that the channel capacity of water injection algorithm is 1 bits / (s.Hz) and 0.5 bits / (s), respectively, when the power is limited, compared with the equal power allocation and MRC power allocation algorithm. Hz) increase, the system performance has been significantly improved.