Journal ArticleDOI
Simultaneous Detection and Channel Estimation for Censoring-Based Spectrum Sensing in Cognitive Radio Networks
Jyoti Mansukhani,Priyadip Ray +1 more
TLDR
This letter considers simultaneous primary user (PU) detection and channel estimation for censoring-based spectrum sensing in cognitive radio networks over fading channels and optimize the censoring parameter and the power allocation for throughput maximization under transmit and interference power constraints.Abstract:
This letter considers simultaneous primary user (PU) detection and channel estimation for censoring-based spectrum sensing in cognitive radio networks over fading channels. We formulate the problem mathematically for Rician and Rayleigh fading channels. Closed-form expressions are derived for the critical performance metrics in low SNR regime. Further, we optimize the censoring parameter and the power allocation for throughput maximization under transmit and interference power constraints. Our results demonstrate that simultaneous PU detection and channel estimation substantially improve the throughput of cognitive radio networks over an approach where PU detection and channel estimation are treated independently.read more
Citations
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Journal ArticleDOI
Cognitive Communication in Link-Layer Evaluation Based Cellular-Vehicular Networks
TL;DR: It is shown that the effective capacity is the most sensitive to quality-of-service exponent and short transmission range of the infrastructures and vehicles is necessary to improve the effective Capacity.
Journal ArticleDOI
Optimal Pilot-Based Channel Estimation in Cognitive Radio
TL;DR: The optimal insertion of the pilots in the input data symbols before transmitting the signal through the fading OFDM channels in CR is made through the proposed ridergrey wolf optimization, which is the integration of the grey wolf optimization and rider optimization algorithm.
Journal ArticleDOI
A Hierarchical Spectrum Access Scheme for TV White Space Coexistence in Heterogeneous Networks
TL;DR: The proposed spectrum sharing framework can provide a practical model for TVWS-coexistence that prevents undesired interference to the incumbents while restricting interference among the unlicensed devices.
Journal ArticleDOI
Throughput maximisation in cognitive radio networks with residual bandwidth
TL;DR: Close form expressions of the optimal spectrum sensing duration, bandwidth, and power allocation of each secondary node are obtained to maximise the sum throughput of the overall CRN while maintaining the constraints of sensing reliability of PU, individual SU transmission outage probability, permissible interference, and residual bandwidth.
Journal ArticleDOI
A hybrid model for energy efficient spectrum sensing in cognitive radio
Mahua Bhowmik,P. Malathi +1 more
TL;DR: A hybrid prediction model is introduced for energy efficient spectrum sensing in CR and the performance of the proposed model is evaluated with the existing models and the proposed hybrid model outperformed the other techniques.
References
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Journal ArticleDOI
Cognitive radio: brain-empowered wireless communications
TL;DR: Following the discussion of interference temperature as a new metric for the quantification and management of interference, the paper addresses three fundamental cognitive tasks: radio-scene analysis, channel-state estimation and predictive modeling, and the emergent behavior of cognitive radio.
MonographDOI
Lectures on modern convex optimization: analysis, algorithms, and engineering applications
TL;DR: The authors present the basic theory of state-of-the-art polynomial time interior point methods for linear, conic quadratic, and semidefinite programming as well as their numerous applications in engineering.
Journal ArticleDOI
Fundamental limits of spectrum-sharing in fading environments
Amir Ghasemi,Elvino S. Sousa +1 more
TL;DR: This paper investigates the capacity gains offered by this dynamic spectrum sharing approach when channels vary due to fading and quantifies the relation between the secondary channel capacity and the interference inflicted on the primary user.
Journal ArticleDOI
Cognitive Radio: An Information-Theoretic Perspective
TL;DR: It is demonstrated that, in a ldquohigh-interferencerdquo regime, multiuser decoding at the primary receiver is optimal from the standpoint of maximal jointly achievable rates for the primary and cognitive users.