Maximising the System Spectral Efficiency in a Decentralised 2-Link Wireless Network

  • Sinan Sinanović
  • Nikola Serafimovski
  • Harald Haas
  • Gunther Auer
Open Access
Research Article
Part of the following topical collections:
  1. Cognitive Radio and Dynamic Spectrum Sharing Systems

Abstract

This paper analyses the system spectral efficiency of a 2-link wireless network. The analysis reveals that there exist three operating points that possibly maximise the system spectral efficiency: either both links transmit with maximum power simultaneously or one single link transmits with maximum power while the other is silent. The impact of the chosen multiple access scheme on the system spectral efficiency is also studied: simultaneous transmission or sequential access where the two links share the medium by dedicated time/frequency slots without causing interference. An exhaustive numerical search over a wide range of channel realisations quantifies the gains in system spectral efficiency when choosing either the optimal, single, simultaneous, or sequential medium access. Furthermore, issues regarding the power efficiency are addressed. Finally, the restriction to a 2-link network is relaxed by introducing background interferers, reflecting a multiple link scenario with one dominant interferer. Simulation results indicate that increasing background interference reduces the advantage of sequential over simultaneous transmission.

Keywords

Maximum Power Operating Point Multiple Access Power Efficiency Single Link 

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Copyright information

© Sinan Sinanović et al. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Authors and Affiliations

  • Sinan Sinanović
    • 1
  • Nikola Serafimovski
    • 2
  • Harald Haas
    • 1
  • Gunther Auer
    • 3
  1. 1.Institute for Digital Communications, School of Engineering and ElectronicsThe University of EdinburghEdinburghUK
  2. 2.School of Engineering and ScienceJacobs University BremenBremenGermany
  3. 3.DoCoMo Euro-LabsMünchenGermany

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