TY - JOUR
T1 - Spectral and Energy Efficiency in Cognitive Radio Systems with Unslotted Primary Users and Sensing Uncertainty
AU - Ozcan, Gozde
AU - Cenk Gursoy, M.
AU - Tang, Jian
N1 - Funding Information:
Manuscript received July 29, 2016; revised January 16, 2017; accepted March 15, 2017. Date of publication April 5, 2017; date of current version October 16, 2017. This research is supported in part by National Science Foundation grants CCF-1618615, CNS-1443966 and ECCS-1443994. This paper was presented at the IEEE International Conference on Communications, London, U.K., June 2015. The associate editor coordinating the review of this paper and approving it for publication was M. Abdallah. (Corresponding author: Gozde Ozcan.) G. Ozcan was with the Department of Electrical Engineering and Computer Science, Syracuse University, Syracuse, NY 13244 USA. She is now with Gozde Ozcan, is Silvus Technologies, Los Angeles, CA 90024 USA (e-mail: gozcan@syr.edu).
PY - 2017/10
Y1 - 2017/10
N2 - This paper studies energy efficiency (EE) and average throughput maximization for cognitive radio systems in the presence of unslotted primary users. It is assumed that primary user activity follows an ON-OFF alternating renewal process. Secondary users first sense the channel possibly with errors in the form of miss detections and false alarms, and then, start the data transmission only if no primary user activity is detected. The secondary user transmission is subject to constraints on collision duration ratio, which is defined as the ratio of average collision duration to transmission duration. In this setting, the optimal power control policy which maximizes the EE of the secondary users or maximizes the average throughput while satisfying a minimum required EE under average/peak transmit power and average interference power constraints is derived. Subsequently, low-complexity algorithms for jointly determining the optimal power level and frame duration are proposed. The impact of probabilities of detection and false alarm, transmit and interference power constraints on the EE, average throughput of the secondary users, optimal transmission power, and the collisions with primary user transmissions are evaluated. In addition, some important properties of the collision duration ratio are investigated. The tradeoff between the EE and average throughput under imperfect sensing decisions and different primary user traffic are further analyzed.
AB - This paper studies energy efficiency (EE) and average throughput maximization for cognitive radio systems in the presence of unslotted primary users. It is assumed that primary user activity follows an ON-OFF alternating renewal process. Secondary users first sense the channel possibly with errors in the form of miss detections and false alarms, and then, start the data transmission only if no primary user activity is detected. The secondary user transmission is subject to constraints on collision duration ratio, which is defined as the ratio of average collision duration to transmission duration. In this setting, the optimal power control policy which maximizes the EE of the secondary users or maximizes the average throughput while satisfying a minimum required EE under average/peak transmit power and average interference power constraints is derived. Subsequently, low-complexity algorithms for jointly determining the optimal power level and frame duration are proposed. The impact of probabilities of detection and false alarm, transmit and interference power constraints on the EE, average throughput of the secondary users, optimal transmission power, and the collisions with primary user transmissions are evaluated. In addition, some important properties of the collision duration ratio are investigated. The tradeoff between the EE and average throughput under imperfect sensing decisions and different primary user traffic are further analyzed.
KW - Cognitive radio
KW - collision constraints
KW - energy efficiency
KW - interference power constraint
KW - optimal frame duration
KW - optimal power control
KW - probability of detection
KW - probability of false alarm
KW - renewal processes
KW - throughput
KW - unslotted transmission
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U2 - 10.1109/TCOMM.2017.2691342
DO - 10.1109/TCOMM.2017.2691342
M3 - Article
AN - SCOPUS:85035777074
VL - 65
SP - 4138
EP - 4151
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
SN - 1558-0857
IS - 10
M1 - 7892848
ER -