LIU Xinyi, LI Ji, dong, JIANG Jian. Optimal Sensing Time Strategy Under Primary Outage Constraint in Cognitive Radio Networks[J]. Chinese Journal of Electronics, 2016, 25(5): 907-911. doi: 10.1049/cje.2016.08.023
Citation: LIU Xinyi, LI Ji, dong, JIANG Jian. Optimal Sensing Time Strategy Under Primary Outage Constraint in Cognitive Radio Networks[J]. Chinese Journal of Electronics, 2016, 25(5): 907-911. doi: 10.1049/cje.2016.08.023

Optimal Sensing Time Strategy Under Primary Outage Constraint in Cognitive Radio Networks

doi: 10.1049/cje.2016.08.023
Funds:  This work is supported by the Fundamental Research Funds for the Central Universities (No.310824161008), the National Natural Science Foundation of China (No.61231008, No.61101143), the Program for Changjiang Scholars and Innovative Research Team in University (No.IRT0852), and the 111 Project (No.B08038).
  • Received Date: 2014-07-04
  • Rev Recd Date: 2014-10-30
  • Publish Date: 2016-09-10
  • 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.
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