@article {Simula.simula.2542,
	title = {System Level Performance of IEEE 802.22 With Sensing-Based Detection of Wireless Microphones},
	journal = {IEEE Communications Magazine},
	volume = {52},
	number = {1},
	year = {2014},
	month = {January},
	pages = {200-209},
	publisher = {IEEE},
	abstract = {We present the state-of-the-art system level evaluation of the IEEE 802.22-2011 standard using a highly detailed simulator implementation in NS-2. In the evaluation our attention is focused on the effect of spatiotemporal wireless microphone (WM) activity on the performance of the IEEE 802.22-2011 network, while considering novel spectrum sensing strategies and multimedia traffic with different prioritization in IEEE 802.22-2011. Our general finding is that the IEEE 802.22-2011 standard deals well with WMs and prioritization of simultaneous multimedia traffic using different QoS profiles, while some surprising conclusions follow.},
	doi = {10.1109/MCOM.2014.6710084},
	author = {P{\r a}l Rolfsen {Gr{\o}nsund} and Pawe{\l}czak, Przemys{\l}aw and Park, Jihoon and Cabric, Danijela}
}
@inproceedings {Simula.simula.2036,
	title = {Sensing of Wireless Microphones in IEEE 802.22: a System Level Performance Evaluation},
	journal = {IEEE International Conference on Communications (IEEE ICC)},
	year = {2013},
	month = {June},
	publisher = {IEEE},
	type = {Conference},
	abstract = {In this paper we present results on the system level performance of the IEEE 802.22 standard with sensing functionality, using a highly detailed implementation of the IEEE 802.22 protocol stack in the NS-2 simulator. Our attention is focused on the effect of spatio-temporal wireless microphone (WM) activity on the performance of the IEEE 802.22 network with spectrum sensing considered. In general we find that the frequency of WM appearance and activity duration should be quite high in all channels not used by the TV broadcaster to reduce IEEE 802.22 throughput, for example about 50\% WM occupancy in each of totally four channels. Furthermore, we find that two-stage spectrum sensing is the best sensing strategy compared to the single-stage and consecutive sensing strategies for reduced interference to WMs and the one that achieves lowest packet loss in the IEEE 802.22 system. Finally, when increasing distance between the IEEE 802.22 node and the WM such that received signal from the WM falls below detection threshold, we find that IEEE 802.22 throughput reduces due to false alarms in the coarse sensing stage while impact on the WM is acceptable.},
	author = {Gr{\o}nsund, P{\r a}l and Park, Jihoon and Cabric, Danijela},
	editor = {Pawe{\l}czak, Przemys{\l}aw}
}
@article {gronsund2011,
	title = {Analysis Framework for Opportunistic Spectrum OFDMA and Its Application to the IEEE 802.22 Standard},
	journal = {IEEE Transactions on Vehicular Technology},
	volume = {61},
	number = {5},
	year = {2012},
	month = {July},
	pages = {2271-2293},
	publisher = {IEEE},
	abstract = {We present an analytical model that enables the evaluation of opportunistic spectrum orthogonal frequency division multiple-access (OS-OFDMA) networks using metrics such as blocking probability or, most importantly, throughput. The core feature of the model, based on a discrete-time Markov chain, is the consideration of different channel and subchannel allocation strategies under different primary and secondary user types, traffic, and priority levels. The analytical model also assesses the impact of different spectrum sensing strategies on the throughput of OS-OFDMA network. In addition, we consider studies of cochannel interference. The analysis is applied to the IEEE 802.22 standard to evaluate the impact of the two-stage spectrum sensing strategy and the varying temporal activity of wireless microphones on the system throughput. In addition to the analytical model, we present a set of comprehensive simulation results using NS-2 related to the delay performance of the OS-OFDMA system considered. Our study suggests that OS-OFDMA with subchannel notching and channel bonding could provide almost ten times higher throughput compared with a design without these options when the activity and density of wireless microphones are very high. Furthermore, we confirm that OS-OFDMA implementation without subchannel notching, which is used in the IEEE 802.22, can support the real-time and non-real-time quality of service classes, provided that the temporal activity of wireless microphones is moderate (with sparse wireless microphone distribution, with light urban population density and short duty cycles). Finally, the two-stage spectrum sensing option improves the OS-OFDMA throughput, provided that the length of spectrum sensing at every stage is optimized using our model.},
	author = {Park, Jihoon and Pawe{\l}czak, Przemys{\l}aw and P{\r a}l Rolfsen {Gr{\o}nsund} and Cabric, Danijela}
}
@inbook {gronsund-et-al,
	title = {System Level Analysis of OFDMA -Based Networks in TV White Spaces: IEEE 802.22 Case Study},
	booktitle = {TV White Space Spectrum Technologies: Regulations, Standards and Applications},
	year = {2011},
	pages = {209-238},
	publisher = {CRC Press},
	organization = {CRC Press},
	chapter = {8},
	author = {Pawe{\l}czak, Przemys{\l}aw and Park, Jihoon and P{\r a}l Rolfsen {Gr{\o}nsund} and Cabric, Danijela},
	editor = {R. A. {Saaed} and S. J. {Shellhammer}}
}
