2011/11/08 by Hossein Shokri-Ghadikolaei, Hossein Shokri‐Ghadikolaei, Shokri-Ghadikolaei, Hossein +6
Computer Science · Engineering · Mathematics · #Cognitive Radio Networks and Spectrum Sensing #FOS: Computer and information sciences #FOS: Mathematics #Optimization and Control (math.OC) #Performance (cs.PF) #Power Line Communications and Noise #Probability (math.PR) #Wireless Communication Networks Research #cs.PF #math.OC #math.PR
paper · pdf · doi:10.48550/arxiv.1111.1926
openalex publication_date 2011/11/08 · arxiv created 2012/01/02 · arxiv updated 2012/01/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Powerful spectrum handover schemes enable cognitive radios (CRs) to use transmission opportunities in primary users' channels appropriately. In this paper, we consider the cognitive access of primary channels by a secondary user. We evaluate the average detection time and the maximum achievable average throughput of the secondary user when the sequential method for hand-over (SMHO) is used. We assume that a prior knowledge of the primary users' presence and absence probabilities are available. When investigating the maximum achievable throughput of the secondary user, we end into an optimization problem, in which the optimum value of sensing time must be selected. In our optimization problem, we take into account the spectrum hand over due to false detection of the primary user. We also propose a weighted based hand-over (WBHO) scheme in which the impacts of channels conditions and primary users' presence probability are considered. This Spectrum handover scheme provides higher average throughput for the SU than the SMHO method. The tradeoff between the maximum achievable throughput and consumed energy is discussed, and finally an energy efficient optimization formulation for finding a proper sensing time is provided.