@article {Simula.simula.1370,
	title = {Secondary Users Cooperation in Cognitive Radio Networks: Balancing Sensing Accuracy and Efficiency},
	journal = {IEEE Wireless Communications},
	volume = {19},
	number = {2},
	year = {2012},
	pages = {30-37},
	abstract = {Cooperative spectrum sensing is a promising technique in cognitive radio networks by exploiting multi-user diversity to mitigate channel fading. Cooperative sensing is traditionally employed to improve the sensing accuracy while the sensing efficiency has been largely ignored. However, both sensing accuracy and efficiency have very significant impacts on the overall system performance. In this article, we first identify the fundamental trade-off between sensing accuracy and efficiency in spectrum sensing in cognitive radio networks. Then, we present several different cooperation mechanisms, including sequential, full-parallel, semi-parallel, synchronous, and asynchronous cooperative sensing schemes. The proposed cooperation mechanisms and the sensing accuracy-efficiency trade-off in these schemes are elaborated and analyzed with respect to a new performance metric achievable throughput, which simultaneously considers both transmission gain and sensing overhead. Illustrative results indicate that parallel and asynchronous cooperation strategies are able to achieve much higher performance, compared to existing and traditional cooperative spectrum sensing in cognitive radio networks.},
	author = {Yu, Rong and Zhang, Yan and Liu, Y. and Xie, Shengli and Song, L. and Guizani, M.}
}
@article {Simula.simula.245,
	title = {Joint Optimization of Power, Packet Forwarding and Reliability in MIMO Wireless Sensor Networks},
	journal = {Mobile Networks and Applications},
	volume = {16},
	number = {6},
	year = {2011},
	pages = {760-770},
	abstract = {In this paper, we study the reliable packet forwarding in Wireless Sensor Networks (WSNs) with the multiple-input multiple-output (MIMO) and orthogonal space time block codes (OSTBC) techniques. The objective is to propose a cross-layer optimized forwarding scheme to maximize the Successful Transmission Rate (STR) while satisfying the given end-to-end power consumption constraint. The channel coding, power allocation, and route planning are jointly considered to significantly improve the transmission quality in terms of STR. The joint optimization design is formulated as a global deterministic optimization and also a local stochastic optimization issues. It is found that the stochastic optimization approach can effectively model, analyze, and solve the routing problem. In order to substantially reduce the implementation complication of the global optimization, we propose a low-complexity distributed scheme. The determination of relaying nodes and power budgets are decoupled, i.e. performing route planning and power allocation separately. We have shown that the result in the distributed scheme is able to provide sufficiently accurate predication of the global optimization. In addition, the proposed scheme can clearly reduce the Symbol Error Rate (SER) and achieve higher STR compared with two existing energy-efficient routing protocols, in which no joint design is considered.},
	doi = {10.1007/s11036-010-0265-3},
	author = {Yu, Rong and Zhang, Yan and Song, L. and Yao, W.}
}
@article {Simula.nd.457,
	title = {Sleeping Management for Scalable Topology Control in Wireless Sensor Networks},
	journal = {Wiley Wireless Communications and Mobile Computing},
	volume = {11},
	number = {8},
	year = {2011},
	month = {Aug.},
	author = {Yu, Rong and Zhang, Yan and Gao, R. and Song, L.}
}
@article {Simula.ND.315,
	title = {QoS-Aware Packet Forwarding in MIMO Sensor Networks: a Cross-Layer Approach},
	journal = {Wiley Wireless Communications and Mobile Computing},
	volume = {10},
	number = {6},
	year = {2010},
	pages = {748-757},
	author = {Song, L. and Zhang, Yan and Yu, Rong and Yao, W.}
}
@inproceedings {Simula.ND.257,
	title = {Cross-Layer Optimized Routing for Wireless Sensor Networks Using Dynamic Programming},
	journal = {the IEEE International Conference on Communications (ICC), ICC 2009},
	year = {2009},
	publisher = {IEEE},
	type = {Conference},
	isbn = {978-1-4244-3435-0},
	author = {Song, L. and Zhang, Yan and Yu, Rong and Yao, W.},
	editor = {IEEE, }
}
