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Enhanced spectrum sensing using a combination of energy detector,matched filter and cyclic prefix

Digital Communications and Networks 2020年第4期6卷 534-541页

作者： Ghassan Alnwaimi Hatem Boujemaa King Abdulaziz University Saudi Arabia COSIM Lab SUPCOMTunisia

In this paper,we propose a sensing scheme based on energy detection,matched filter and cyclic prefix.Both Equal Gain Combining(EGC)and optimal combination of the aforementioned detectors are investigated in cooperative and non-cooperative spectrum sensing scenarios.In packet transmission systems such as OFDM(Orthogonal Frequency Division Multiple access)systems,the proposed scheme takes advantage of utilizing more samples than individual detectors,i.e.,cyclic prefix,training or pilot samples,and data payload samples.The proposed combine-sensing scheme offers higher detection probability and lower false alarm probability,as compared with the performance of individual detectors over the same frame duration.Simulation results are congruent with the theoretical curves and confirm the validity of our derivations.

关键词： Cooperative spectrum sensing Energy detector Matched filter Cyclic prefix CFAR CDR Cognitive radio networks False alarm probability Detection probability

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Radio resource management scheme and outage analysis for network- assisted multi-hop D2D communications

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Digital Communications and Networks 2016年第4期2卷 225-232页

作者： Leila Melki Sameh Najeh Hichem Besbes University of Carthage Higher School of Communications of Tunis COSIM Research Lab Tunisia

In a cellular network it's very difficult to make spectrum resource more efficiently. Device-to-Device (D2D) technology enables new service opportunities, and provides high throughput and reliable communication while reducing the base station load. For better total performance, short-range D2D links and cellular links share the same radio resource and the management of interference becomes a crucial task. Here we argue that single-hop D2D technology can be used to further improve cellular networks performance if the key D2D radio resource management algorithms are suitably extended to support multi-hop D2D communications. Aiming to establish a new paradigm for the analysis and design of multi-hop D2D communications, We propose a radio resource allocation for multi-hop D2D routes based on interference avoidance approach in LTE-A networks. On top of that, we investigate the outage probability of D2D communication. We first introduce a new definition of outage probability by considering the maximum distance to be allowable for single-hop transmission. Then we study and analyze the outage performance of a multi-hop D2D route. We derive the general closed form expression of outage probability of the multi-hop D2D routes. The results demonstrate that the D2D radio, sharing the same resources as the cellular network, provide higher capacity compared to pure cellular communication where all the data is transmitted through the base station. They also demonstrate that the new method of calculation of D2D multi hop outage probability has better performance than classical method defined in the literature.

关键词： D2D Multi-hop Interference avoidance Outage probability LTE-A

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