计算机科学 ›› 2015, Vol. 42 ›› Issue (1): 110-112.doi: 10.11896/j.issn.1002-137X.2015.01.026
周璐娜,刘锋,曾连荪
ZHOU Lu-na, LIU Feng and ZENG Lian-sun
摘要： 自由度来源于使用多天线系统时引入的空间复用概念,体现了通信系统对空间资源的利用效率。认知无线电中,主、次网络的同时存在,将使其在传输过程中相互干扰,从而降低系统自由度。为此,研究了两个点对点网络(PTP)并存时的自由度以及对应的干扰消除方法。得出在主网络的自由度资源还有空余时,次网络在同一频谱资源上利用剩余的空间资源进行消息传递时可获得的自由度范围；同时给出了当主网络的自由度资源完全占用时,次网络可获得的最大自由度。在此基础上,还研究了主、次网络在接收端进行协作,通过某种方式借用主网络剩余的天线来提高整个网络的自由度。分析比较表明,当M1≤N1或N1≥M1+M2 时,接收端的协作能提高网络的总自由度。
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