Journal on Communications ›› 2014, Vol. 35 ›› Issue (1): 167-172.doi: 10.3969/j.issn.1000-436x.2014.01.019

• Academic communication • Previous Articles     Next Articles

Interference alignment based spectrum sharing and user scheduling for cognitive radio MIMO system

Zhao LI,Jian-dong LI,Qin LIU,Biao SHEN   

  1. State Key Laboratory of Integrated Service Networks,Xidian University,Xi’an 710071,China
  • Online:2014-01-25 Published:2017-06-17
  • Supported by:
    The National Natural Science Foundation of China;The National Natural Science Foundation of China;National S&T Major Project;The National Basic Research Program of China (973 Program);The 111 Project;Program for Changjiang Scholars and Innovative Research Team in University;ISN Project

Abstract:

In communication scenario with multiple cognitive radio (CR) multi-input multi-output (MIMO) users,signal processing algorithm was designed based on interference alignment (IA) such that transmissions of cognitive and authorized signal were carried out in mutual orthogonal sub-spaces.Conflict-free utilization of spare spatial channel(s) authorized by primary system was achieved by cognitive user.Moreover,the difference of spatial transmission performance originating from various channel matrices was exploited to implement appropriate user scheduling.Simulation results show that the proposed method can utilize spare spatial channel resource effectively and obtain multiuser diversity gain.On the premise that authorized service is protected from disturbing,transmission rate of cognitive user is improved.

Key words: interference alignment, cognitive radio, MIMO system, multiuser

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