All cognitive MIMO: New multiuser detection approach with different priorities

Nikolaos I. Miridakis, Theodoros A. Tsiftsis, Dimitrios D. Vergados, Angelos Michalas

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A new detection scheme for multiuser multiple-input multiple-output (MIMO) systems is analytically presented. In particular, the transmitting users are being categorized in two distinct priority service groups, while they communicate directly with a multi-antenna receiver. The linear zero-forcing scheme is applied in two consecutive detection stages upon the signal reception. In the first stage, the signals of one service group are detected, followed by the second stage, including the corresponding detection of the remaining signals. An appropriate switching scheme based on specific transmission quality requirements is utilized prior to the detection so as to allocate the signals of a given service group to the suitable detection stage. The objective is the provision of the reception quality for both service groups. The proposed approach can be implemented directly in cognitive radio communication assigning the secondary users to the appropriate service group. The exact outage probability of the considered system is derived in closed form. The special case of massive MIMO is further studied yielding some useful engineering outcomes; the effective channel coherence time and a certain optimality condition defining both the transmission quality and effective number of independent transmissions.

Original languageEnglish
Article number8368094
Pages (from-to)5148-5161
Number of pages14
JournalIEEE Transactions on Wireless Communications
Issue number8
Publication statusPublished - Aug 2018


  • Cognitive radio
  • Imperfect channel estimation
  • Massive MIMO
  • Multiuser detection
  • Outage probability
  • Spatial multiplexing

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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