Joint optimization scheme and sum constellation distribution for multi-user Gaussian multiple access channels with finite input constellations

Xuepeng Xiao, Qin Huang, Emanuele Viterbo

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5 Citations (Scopus)


Phase adjusting and power adjusting input schemes of non-orthogonal Gaussian multiple access channels (GMAC) for two-user with finite input constellations have been studied. In this paper, the input scheme for multi-user is jointly optimized by both powers and phases. This scheme is deduced from the constellation constrained (CC) capacity of multi-user GMAC. Performance analysis indicates that the proposed input scheme outperforms previous input schemes for most SNR and achieves the largest enlargement of CC capacity region at high SNR values. Motivated by the properties of sum constellation's distance distribution, a procedure to efficiently obtain optimal multi-user input schemes is proposed for MPSK input constellations.

Original languageEnglish
Title of host publication2016 Australian Communications Theory Workshop, AusCTW 2016
EditorsPhee Lep Yeoh
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages6
ISBN (Electronic)9781509001330
Publication statusPublished - 17 Mar 2016
EventAustralian Communications Theory Workshop 2016 - Melbourne, Australia
Duration: 20 Jan 201623 Jan 2016 (Proceedings)


ConferenceAustralian Communications Theory Workshop 2016
Abbreviated titleAusCTW 2016
Internet address


  • Capacity regions
  • Distance distributions
  • Gaussian multiple-access channels
  • Joint optimization
  • Multi-user
  • Non-orthogonal
  • Performance analysis
  • Power adjusting

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