Priority-based zero-forcing in spectrum sharing cognitive systems

Karama Hamdi, Mazen O. Hasna, Ali Ghrayeb, Khaled Letaief

Research output: Contribution to journalArticle

5 Citations (Scopus)


We consider a spectrum sharing scenario between cognitive radio (CR) users and a licensed primary user (PU), in which the PU is not able to successfully transmit data to its destined receiver. The cognitive base station (CBS) in the vicinity of the primary network, offers its help to transmit the primary data. In return, the CR system is able to share the spectrum with the primary system. We formulate an opportunistic spectrum sharing approach that determines the transmit beamforming weights in order to maximize the overall throughput of the CRs while guaranteeing the quality-of-service (QoS) of the PU. By applying algorithms based on zero-forcing beamforming (ZFB) along with optimal power allocation, the proposed approach is able to achieve cognitive and primary systems requirements.

Original languageEnglish
Article number6409340
Pages (from-to)313-316
Number of pages4
JournalIEEE Communications Letters
Issue number2
Publication statusPublished - 2013



  • Cognitive radio
  • relaying
  • spectrum sharing
  • zero-forcing beamforming

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Modelling and Simulation

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