The Journal of Supercomputing

, Volume 75, Issue 4, pp 2058–2069 | Cite as

Distributed interference alignment algorithm in downlink multi-user cooperative networks

  • Yongli AnEmail author
  • Ruihua Sun
  • Xinwen Wu
  • Xiaochuan Sun


In multi-user cooperative cognitive network, the primary user and cognitive user can not share the same spectrum band simultaneously, which leads to low spectrum utilization. Based on this fact, a distributed interference alignment algorithm based on a relay is proposed. This algorithm considers cognitive user as a relay, which means it transmits both its own transmitting signal and the primary user’s transmitting signal. At receivers, they can separate their desired signals without interference. The primary link does not need to perceive the existence of cognitive link. The proposed algorithm makes the complexity of pre-coding low. Its process of pre-coding is implemented by the relay. In addition, analysis and simulation results show that the channel capacities of primary and cognitive link are all improved compared with those of traditional algorithms in both strong and weak correlation channel conditions.


Interference alignment Cognitive relay Pre-coding Cognitive networks 



This project is supported by ‘The Excellent Going Abroad Experts’ Training Program in Hebei Province, Doctoral Research Start-up Fund of North China University of Science and Technology, Hebei, Natural Science Foundation of China (No. F2014209276).


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Yongli An
    • 1
    • 2
    Email author
  • Ruihua Sun
    • 1
  • Xinwen Wu
    • 2
  • Xiaochuan Sun
    • 1
  1. 1.College of Information EngineeringNorth China University of Science and TechnologyTangshanChina
  2. 2.School of Information and Communication TechnologyGriffith UniversityGold coastAustralia

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