Open AccessOptimal Sensing Time Strategy Under Primary Outage Constraint in Cognitive Radio Networks
Author(s) -
Liu Xinyi,
Li Jiandong,
Jiang Jian
Publication year - 2016
Publication title -
chinese journal of electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.267
H-Index - 25
eISSN - 2075-5597
pISSN - 1022-4653
DOI - 10.1049/cje.2016.08.023
Subject(s) - cognitive radio , constraint (computer aided design) , computer science , primary (astronomy) , cognition , computer network , time constraint , telecommunications , psychology , mathematics , political science , wireless , psychiatry , physics , geometry , astronomy , law
With the underlay approach, Secondary users (SUs) can utilize the same frequency bands simultaneously with Primary users (PUs) in Cognitive radio networks (CRNs). How to choose the appropriate transmission power of SUs under the influence caused by other cells is a problem. To solve this problem, spectrum sensing is introduced to identify the existence of interference which using pilot signal to perform coherent processing. Consider the probability of detection of SUs, there exists a trade‐off between the sensing time and the achievable throughput of CRNs. When the prior probability of other cells' activity is unknown to SUs, throughput of the CRNs can be viewed as a concave function. According to solving the optimization problem, the optimal sensing time is obtained. Simulation results show the feasibility and correctness.