中文摘要：

信道状态信息的存在可以使通信系统对信道获得自适应性,在多输入多输出系统中为高可靠性高速率的通信提供了保障。在接收端获得CSI通常是现实可行的,而发射端CSI的获得则需满足一定条件。容量是衡量信道传输能力的重要指标,而自由度是表征容量线性增长能力的主要因子。因此CSIT的存在或是缺失会对MIMO网络的容量及自由度产生一定的影响,为此研究了CSIT对MIMO网络自由度的影响,主要包括广播信道、干扰信道以及X信道,将有/无CSIT情况下获得的Do F及其区域进行分情况比较,分析得出大部分情况下CSIT的存在能够增加网络的Do F,有CSIT时MIMO XC的自由度区域以及多网络并存时的Do F及其区域有待进一步研究。

英文摘要：

The existence of the channel state information（ CSI） gave the communication system self-adaptation to the channel,and guaranteed the high-speed and high reliable communication for multiple-input multiple-output（ MIMO） systems. It was often practical for the receivers to get the CSI,while it needed some condition for the CSI at transmitters（ CSIT）. Capacity was the most important measurement for the transmission capability of channel,and degree of freedom（ Do F） was the main factor to represent the linear scalability of the capacity. As a result,the existence of CSIT would affect to the capacity and Do F of MIMO networks. This paper studied and compared the impact to the Do F and region of Do F of the MIMO networks by the CSIT in different constraints,including the broadcasting channel（ BC）,interference channel（ IC）,X channel（ XC）. Finally it concluded that CSIT could increase the Do F in the most scenarios for these networks. The region of Do F of MIMO XC with CSIT,the Do F and region of Do F of multi networks coexistence need further research.