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研究了在各节点已知全局信道状态信息(Channel State Information,CSI)时,由M×M X信道(X Channel,XC)和基本信道构成的并存网络的自由度。此处基本信道涉及两种类型:点对点信道(Point to Point,PTP)、M用户广播信道(Broadcast Channel,BC)。XC每个发送端给每个接收端发送期望消息,BC只给对应接收端发送独立消息。基于符号扩展模型,通过分M个时隙讨论,在每个时隙采用渐进干扰对齐方案得到了M×M XC分别与上述两种基本信道并存网络的自由度下界。另一方面,该下界也被证明是自由度上界,故得出几种并存网络系统的自由度。
The degree of freedom of coexisting networks composed of M × M X channels (XC) and basic channels is studied when each node knows the channel state information (CSI). The basic channel here involves two types: Point to Point (PTP), M User Broadcast Channel (BC). Each sender of XC sends a desired message to each receiver, and BC sends only independent messages to the corresponding receiver. Based on the symbolic extension model, the lower bound of the degree of freedom of M × M × C and the above two kinds of basic channels coexisting networks are respectively obtained by discussing M timeslots and using progressive interference alignment in each time slot. On the other hand, the lower bound has also been shown to be the upper bound of degrees of freedom, leading to several degrees of freedom in the coexistence of networked systems.