approved: Bechir Hamdaoui This thesis proposes a novel technique that exploits spectrum occupancy behaviors inherent to wideband spectrum access to enable efficient cooperative spectrum sensing. The proposed technique reduces the number of required sensing measurements while accurately recovering spectrum occupancy information. It does so by leveraging compressive sampling theory to exploit the...

The spectrum scarcity has led to rethink in the current frequency spectrum usage and develop a new concept of wireless networking. Opportunistic Spectrum Networks (OSNs) have been considered as a promising solution to the problem of spectrum shortage. In this paper, in order to compensate for the need of complex hardware, a novel and efficient Medium Access Control (MAC) framework that integrat...

In this paper the performance of cooperative spectrum sensing scheme using double threshold energy detection technique in the presence of sensor noise has been investigated. Each cognitive user takes a local decision on spectrum occupancy and sends one bit information to convey its decision to a fusion center. The fusion center collects all decisions and takes a final decision about the presenc...

Spectrum scarcity is impeding practical implementations of emerging wireless multimedia applications requiring significantly more frequency spectrum. Cognitive radio (CR) has emerged as a promising solution to the current spectral congestion problem by imparting intelligence to the conventional software defined radio that allows spectrum sharing through opportunistic spectrum access. The princi...

To sense the spectrum efficiently in heterogeneous multi-channel and multi-user cognitive network, a parallel cooperative spectrum sensing strategy based on genetic algorithm is proposed. It defines the expression of system utility considering the transmission gain and sensing overhead, and protects the primary user network by introducing the penalty function. To obtain the largest system utili...

It is imperative to address the problem of spectrum under usage and inefficiency because increasing demand slender resources. One salient functions cognitive radio sensing which used avoid interference unlice

In this paper, we consider the cooperative spectrum sensing problem in a cognitive radio (CR) mesh network, where secondary users (SUs) are self-organized into a IEEE 802.16 mesh network sharing the spectrum band allocated to a primary users’ (PUs) network. We propose two new cooperative spectrum sensing strategies, called amplify-and-relay (AR) and detect-andrelay (DR), aiming at improving the...