基于多用户分集的信道容量分析

为了研究多输入多输出系统(M IMO)中多用户分集的信道容量,在统一的系统容量模型下,使用理论推导和数值仿真,详细推导了多用户分集信道容量模型及其增益的来源,分析了在归一化最大调度下的信道容量的上下界,阐述了资源调度和功率分配对信道容量的影响,指出了空间分集与多用户分集的联合对系统容量的影响。结果表明,用户个数、发送天线的个数、接收天线的个数、资源调度方法、功率分配方案、空间分集和多用户分集的联合方式等,都对多用户分集系统的容量有着不同程度的影响。只有综合考虑各种因素,才能最大限度地获得多用户分集增益,否则可能得到相反的效果。

Analysis of channel capacity based on multiuser diversity

The channel capacity of multiuser diversity in the multiple-input multiple-output(MIMO) system was studied.The model and gain of multiuser diversity channel capacity were particularly deduced,and then the upper and lower bounds of channel capacity in the sense of the normalized maximum scheduling analyzed.The impact of resources scheduling and power assignment on channel capacity was explained,together with impact of the combination of spatial diversity and multiuser diversity on system capacity.The analysis and simulation results show that the capacity of mulituser diversity systems is influenced by such factors as the number of the users,the number of transmitting antennas,the number of receiving antennas,the scheme of resources scheduling and power assignment,and the combination of spatial diversity and multiuser diversity.