Ramzi Saifan

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Two objectives of sensing in cognitive radio (CR) are to detect the primary user (PU) accurately and quickly, which are contradicting objectives. Therefore, many papers try to optimize this tradeoff and find the minimum sensing time which protects the PU. The trends are classified in enhancing false alarm probability (Pf ) and detection probability (Pd),(More)
Abstract—The cognitive radio (CR) nodes in a cognitive radio network (CRN) do not have license to use specific spectrum band. Instead, they use the spectrum bands of the licensed primary users (PU) without interfering with the PU. When the PU becomes active, interfering CRs should leave to another available spectrum band within the PU’s tolerable(More)
Many existing in-band sensing algorithms for CRNs adopted a periodic sensing/transmission architecture, where all the CR users do periodic sensing. Each periodic detection cycle is divided into two parts: sensing and transmission times. Sensing times are affected by many factors. In some worse scenarios (e.g., low SNRs), it may take more than half of the(More)
The motivation behind cognitive radio networks (CRNs) was to increase the utilization of the underutilized wireless spectrum bands. An important factor to achieving this goal is fast sensing, because if the cognitive radio (CR) node has one transceiver for sensing and transmission, then the longer the sensing time, the less the transmission time left and(More)
In this paper a detailed analysis of Data Encryption Standard (DES), Triple DES (3DES) and Advanced Encryption Standard (AES) symmetric encryption algorithms in MANET was done using the Network Simulator 2 (NS-2) in terms of energy consumption, data transfer time, End-to-End delay time and throughput with varying data sizes. Two simulation models were(More)
We consider spectrum sensing strategies used to discover available spectrum in Cognitive Radio Networks (CRNs), using both non-cooperative sensing and cooperative sensing approaches. After introducing the background to sensing techniques, this position paper focuses on strategies and algorithms for conducting sensing such that the sensing time and energy(More)
Cognitive Radio Networks (CRNs) with such spectrum aware devices is a confident key to the spectrum insufficiency issue in wireless communication area. In this, an effective routing solution with a cross layer design is proposed for the multi-hop CRNs. The existing work uses Ad-hoc On-demand Distance Vector (AODV) routing protocol for CRNs. In cognitive(More)
Routing in cognitive radio networks (CRNs) necessitates a cross-layering approach. However, according to [1], CRN routing protocols proposed in literature are partially cross-layer, because the information flow is only from physical layer to network layer, e.g., about channels availabilities. In this work, we introduce a cross-layer routing protocol (CLRP),(More)
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