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On the Design of Cognitive-Radio-Inspired Asymmetric Network Coding Transmissions in MIMO Systems

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • Zhongyuan Zhao
  • Zhiguo Ding
  • Mugen Peng
  • Wenbo Wang
  • John S. Thompson
<mark>Journal publication date</mark>03/2015
<mark>Journal</mark>IEEE Transactions on Vehicular Technology
Issue number3
Number of pages12
Pages (from-to)1014-1025
Publication StatusPublished
Early online date29/05/14
<mark>Original language</mark>English


In this paper, a cognitive-radio-inspired asymmetric network coding (CR-AsNC) scheme is proposed for multiple-input-multiple-output (MIMO) cellular transmissions, where information exchange among users and base-station (BS) broadcasting can be accomplished simultaneously. The key idea is to apply the concept of cognitive radio (CR) in network coding transmissions, where the BS tries sending new information while helping users' transmissions as a relay. In particular, we design an asymmetric network coding method for information exchange between the BS and the users, although many existing works consider the design of network coding in symmetric scenarios. To approach the optimal performance, an iterative precoding design for CR-AsNC is first developed. Then, a channel-diagonalization-based precoding design with low complexity is proposed, to which power allocation can be optimized with a closed-form solution. The simulation results show that the proposed CR-AsNC scheme with precoding optimization can significantly improve system transmission performance.