NDLI: On performance of bi-directional cognitive radio networks

Content Provider	IEEE Xplore Digital Library
Author	Ligata, A. Gacanin, H. Adachi, F.
Copyright Year	2011
Description	Author affiliation: Communication Department, IPSA Institute, Sarajevo, Bosnia and Herzegovina (Ligata, A.) \|\| Motive Division, Alcatel-Lucent Bell N.V., Antwerp, Belgium (Gacanin, H.) \|\| Graduate School of Engineering, Tohoku University, Sendai, Japan (Adachi, F.)
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.
Starting Page	1
Ending Page	5
File Size	1202128
Page Count	5
File Format	PDF
ISBN	9781457703898
e-ISBN	9781457703904
DOI	10.1109/APCC.2011.6152749
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-10-02
Publisher Place	Malaysia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bidirectional control OFDM Cognitive radio Multiaccess communication Wireless networks Sensors Encoding spectrum efficiency wireless network coding NC-OFDM
Content Type	Text
Resource Type	Article

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