Probability-based optimization of inter-sensing duration and power control in cognitive radio

Authors:
Xiangwei Zhou;Jun Ma;Geoffrey Ye Li;Young Hoon Kwon;Anthony C. K. Soong
Affiliations:
School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA;School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA;School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA;Wireless Advanced Research, Huawei Technologies, Plano, TX;Wireless Advanced Research, Huawei Technologies, Plano, TX
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

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Abstract

Probability-based strategies are proposed in this letter to determine the optimal inter-sensing duration and power control for cognitive radio (CR). With utilization of the statistics of licensed band occupancy, appropriate inter-sensing duration is determined to capture the recurrence of spectrum opportunity in time when the licensed signal is detected, or to achieve the maximum spectrum efficiency under a certain level of interference with licensed communication when the licensed signal is declared absent. Transmit power is varied dynamically according to the non-interfering probability at each sample so as to increase the transmission rate and decrease the interference power.