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In optical wireless communication systems, the underwater visible light communication (UVLC) systems is becoming more and more popular. However, due to intrinsic properties of water body, the propagating optical channel can suffer from severe degrading effects, namely absorption, scattering, and turbulence. Here, we aim to improve the UVLC system performance. For this, we propose to utilize an adaptive...
Because of its spectrum-sharing nature, a CR network inevitably operates in interference-intensive environments. One challenge is how to maintain the interferences generated by the cognitive transmissions to the primary network below an acceptable threshold level. In this paper, we firstly propose an efficient primary users identification, using compressive sensing (CS). Our focus is on the angular...
In this paper, we consider an underlay cognitive radio system where secondary users can coexist with primary users in the same spectrum and region. To guarantee no interference to the primary network, the secondary base station (BS-S) needs to identify the active primary users (PUs) and to have a perfect or partial knowledge of the PU channels. For this aim, we assume that the BS-S is equipped with...
In this paper, a cognitive radio scenario is proposed, where secondary users are allowed to communicate concurrently with primary users provided that they do not create harmful interference to the licensed users. Here, we aim to improve the unlicensed system performance under power and interfernce constraints. For this aim, we propose to use a cooperative relay to assist the secondary transmission...
In this contribution, a cognitive radio scenario is considered, where secondary users are allowed to communicate concurrently with primary users provided that they do not create harmful interference to the licensed users. Here, we aim to improve the throughput of unlicensed system. For this aim, we propose to use cooperative techniques only if the resulting average interference power at the primary...
In this paper, a cognitive radio scenario is proposed, where secondary users are allowed to communicate concurrently with primary users provided that they do not create harmful interference to the licensed users. Here, we aim to improve the throughput of unlicensed system. For this aim, we propose a selective relay cooperative scheme to assist the secondary transmission. Moreover, an adaptive modulation...
Cognitive radio is an exciting emerging technology that has the potential of dealing with the stringent requirement and scarcity of the radio spectrum. Such revolutionary and transforming technology represents a paradigm shift in the design of wireless systems as it will offer the ability of radio sensing, self adaptation and dynamic spectrum sharing. In this paper, we are interested in the case where...
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