Computer Science ›› 2016, Vol. 43 ›› Issue (2): 129-134.doi: 10.11896/j.issn.1002-137X.2016.02.029

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Degrees of Freedom of Coexistence Network with Point-to-Point and Two-user Broadcast Channels

LIU Feng, WANG Yuan-yuan and ZENG Lian-sun   

  • Online:2018-12-01 Published:2018-12-01

Abstract: The degrees of freedom (DoF) of two networks with coexistence was investigated in this paper.One is a point-to-point(PTP) channel and the other is a two-user broadcast channel (BC).Four system models were considered.First,BC as se-condary network is not cognitive of PTP (primary network) transmitter’ message.Second,PTP as se-condary network is not cognitive of BC transmitters’ messages.Third,BC as secondary network is cognitive of PTP transmitter’ message.Fourth,PTP as secondary network is cognitive of BC transmitters’ messages.The achievable DoF was obtained by using interference alignment and interference neutralization.Besides,the outer bound was proven.Compared with the other three system models,the achievable bound is biggest when BC as secondary network is cognitive of PTP transmitters’ message.

Key words: Coexistence,Degrees of freedom,Cognitive,Interference alignment,Interference neutralization

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