On performance of bi-directional cognitive radio networks

Amir Ligata, Haris Gacanin, F. Adachi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Future wireless Internet services require a broadband frequency spectrum with high data rates. Cognitive radio (CR) concept is a novel approach to improve the spectrum efficiency. The CR is based on the opportunistic usage of frequency spectrum, which is not occupied by the primary users. Conventional multi-user access in bi-directional CR network may be done by using either time division multiple access (TDMA), frequency division multiple access (FDMA) or code division multiple access (CDMA). Without adaptive or dynamic frequency reuse, TDMA and FDMA have lower spectrum efficiency in comparison with CDMA. However, the problem of CDMA in a multipath channel is a multi-user interference (MUI). In this paper, we present a bi-directional CR network with wireless network coding (WNC) in a multipath channel. Unlike the conventional multi-user bi-directional CR network, where the users access the spectrum holes in different time-slot or frequency, the proposed method allows secondary users (SUs) to access the spectrum holes simultaneously. The performance of bi-directional CR network with WNC is theoretically analyzed in terms of spectrum efficiency and the maximum number of SUs. The numerical results show that the spectrum efficiency and the maximum number of SUs of the proposed method increases in comparison with conventional CR network.

Original languageEnglish
Title of host publication17th Asia Pacific Conference on Communications, APCC 2011
Pages1-5
Number of pages5
DOIs
Publication statusPublished - 2011 Dec 1
Event17th Asia Pacific Conference on Communications, APCC 2011 - Kota Kinabalu, Sabah, Malaysia
Duration: 2011 Oct 22011 Oct 5

Publication series

Name17th Asia-Pacific Conference on Communications, APCC 2011

Other

Other17th Asia Pacific Conference on Communications, APCC 2011
CountryMalaysia
CityKota Kinabalu, Sabah
Period11/10/211/10/5

Keywords

  • Cognitive radio
  • NC-OFDM
  • spectrum efficiency
  • wireless network coding

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Communication

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