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Improving the Throughput of Cognitive Radio Networks Using the Broadcast Approach

Bibliography:

Lokman Sboui, Zouheir Rezki, Mohamed-Slim Alouini, Improving the Throughput of Cognitive Radio Networks Using the Broadcast Approach, in Proc. IEEE Global Communications Conference (GLOBECOM'2013), Atlanta, Georgia, December 2013

Authors:

Lokman Sboui, Zouheir Rezki and Mohamed-Slim Alouini

Keywords:

Underlay cognitive radio, achievable rate, broadcast approach, quantized CSI, fading channels.

Year:

2013

Abstract:

We study the impact  of adopting   a multi layer coding (MLC) strategy, i.e., the so-called broadcast approach (BA) on the throughput of Cognitive Radio (CR) spectrum sharing systems for general fading channels. First, we consider a scenario where the secondary transmitter, a part from the statistics, has no channel state information (CSI) of the cross link and its own link. We show that using  BA improves the cognitive achievable rate compared to the outage rate provided by a single layer coding (SLC). In addition, we, also, observe numerically that 2-Layer coding achieves most of the gain. Then, we consider a situation where the secondary transmitter has a partial CSI about its own link through  quantized CSI. Again, we compute the secondary achievable rate adopting the BA and highlight the improvement over SLC.  Numerical results show that the advantage of MLC decreases as the rate of the feedback link increases.

ISSN:

2013