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。
[1] Viswanath P,Tse D N C.Sum capacity of the vector Gaussian broadcast channel and uplink-downlink duality[J].IEEE Trans.Inf.Theory,2003,49(8):1912-1921 [2] Viswanath S,Jindal N,Goldsmith A.Duality,achievable rates,and sum-rate capacity of Gaussian MIMO broadcast channels[J].IEEE Trans.Inf.Theory,2003,49(10):2658-2668 [3] Yu W,Cioffi J M.Sum capacity of Gaussian vector broadcastchannels [J].IEEE Trans.Inf.Theory,2004,0(9):1875-1892 [4] Huang Chia-chi,Jafar S A.Degrees of freedom of the MIMO interference channel with cooperation and cognition[J].IEEE Trans on Information Theory,2009,55(9):4211-4220 [5] Vaze C S,Varanasi M K.A new outer bound via interference localization and degree of freedom regions of MIMO interference networks with no CSIT[J].IEEE Trans.Inf.Theory,2012,8(11):6853-6869 [6] Zhu Yan,Guo Dong-ning.The degrees of freedom of isotropicMIMO interference channels without state information at the transmitters[J].IEEE Trans.Inf.Theory,2012,8(1):341-352 [7] Vaze C S,Varanasi M K.On completing the degrees of freedom characterization of MIMO interference networks with CSIT[C]∥IEEE International Symposium on Information Theory Procee-dings.2011 [8] Chen Guo-xing,Xiang Zheng-zheng,Xu Chang-qing,et al.OnDegree of Freedom of Cognitive Networks with User Cooperation [J].IEEE Wireless Communication Letters,2012,1(6):617-620 [9] Park S H,Lee I.Degree of Freedom for Mutually InterferingBroadcast Channels[J].IEEE Trans on Information Theory,2012,58(1):393-401 [10] Fette B A.Cognitive Radio Technology[M].Academic Press,2006 [11] Haykin S.Cognitive radio:brain-empowered wireless communications [J].IEEE J.Sel.Areas Commun.,2005,3(2):201-202 [12] Amir M,El K A,Nafie M.Constrained interference alignment and the spatial degrees of freedom of MIMO cognitive networks[J].IEEE Trans.Inf.Theory,2011,7(5):2994-3004 [13] Jafar S A.Interference alignment:a new look at signal dimen-sions in a communication network[M].Foundations and Trends in Commun.And Inf.Theory,2011 [14] Jafar S A,Fakhereddin M J.Degrees of Freedom for the MIMO Interference Channel[J].IEEE Trans on Information Theory,2012,58(1):2737-2641 |
No related articles found! |
|