TY - JOUR
T1 - Aggregate Interference Modeling in Cognitive Radio Networks with Power and Contention Control
AU - Chen, Zengmao
AU - Wang, Cheng-Xiang
AU - Hong, Xuemin
AU - Thompson, John S.
AU - Vorobyov, Sergiy A.
AU - Ge, Xiaohu
AU - Xiao, Hailin
AU - Zhao, Feng
PY - 2012/2
Y1 - 2012/2
N2 - In this paper, we present interference models for cognitive radio (CR) networks employing various interference management mechanisms including power control, contention control or hybrid power/contention control schemes. For the first case, a power control scheme is proposed to govern the transmission power of a CR node. For the second one, a contention control scheme at the media access control (MAC) layer, based on carrier sense multiple access with collision avoidance (CSMA/CA), is proposed to coordinate the operation of CR nodes with transmission requests. The probability density functions (PDFs) of the interference received at a primary receiver from a CR network are first derived numerically for these two cases. For the hybrid case, where power and contention controls are jointly adopted by a CR node to govern its transmission, the interference is analyzed and compared with that of the first two schemes by simulations. Then, the interference PDFs under the first two control schemes are fitted by log-normal PDFs to reduce computation complexity. Moreover, the effect of a hidden primary receiver on the interference experienced at the receiver is investigated. It is demonstrated that both power and contention controls are effective approaches to alleviate the interference caused by CR networks. Some in-depth analysis of the impact of key parameters on the interference of CR networks is given as well.
AB - In this paper, we present interference models for cognitive radio (CR) networks employing various interference management mechanisms including power control, contention control or hybrid power/contention control schemes. For the first case, a power control scheme is proposed to govern the transmission power of a CR node. For the second one, a contention control scheme at the media access control (MAC) layer, based on carrier sense multiple access with collision avoidance (CSMA/CA), is proposed to coordinate the operation of CR nodes with transmission requests. The probability density functions (PDFs) of the interference received at a primary receiver from a CR network are first derived numerically for these two cases. For the hybrid case, where power and contention controls are jointly adopted by a CR node to govern its transmission, the interference is analyzed and compared with that of the first two schemes by simulations. Then, the interference PDFs under the first two control schemes are fitted by log-normal PDFs to reduce computation complexity. Moreover, the effect of a hidden primary receiver on the interference experienced at the receiver is investigated. It is demonstrated that both power and contention controls are effective approaches to alleviate the interference caused by CR networks. Some in-depth analysis of the impact of key parameters on the interference of CR networks is given as well.
KW - Cognitive radio
KW - contention control
KW - hidden primary receiver
KW - interference modeling
KW - power control
U2 - 10.1109/TCOMM.2011.012012.100426
DO - 10.1109/TCOMM.2011.012012.100426
M3 - Article
SN - 0090-6778
VL - 60
SP - 456
EP - 468
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
IS - 2
ER -