Next century challenges: scalable coordination in sensor networks
MobiCom '99 Proceedings of the 5th annual ACM/IEEE international conference on Mobile computing and networking
Wireless integrated network sensors
Communications of the ACM
Physical layer driven protocol and algorithm design for energy-efficient wireless sensor networks
Proceedings of the 7th annual international conference on Mobile computing and networking
Sensor networks with mobile agents
MILCOM'03 Proceedings of the 2003 IEEE conference on Military communications - Volume I
Opportunistic ALOHA and cross layer design for sensor networks
MILCOM'03 Proceedings of the 2003 IEEE conference on Military communications - Volume I
An application-specific protocol architecture for wireless microsensor networks
IEEE Transactions on Wireless Communications
Information-theoretic considerations for symmetric, cellular, multiple-access fading channels. I
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
Asymptotically optimal water-filling in vector multiple-access channels
IEEE Transactions on Information Theory
The impact of frequency-flat fading on the spectral efficiency of CDMA
IEEE Transactions on Information Theory
Opportunistic beamforming using dumb antennas
IEEE Transactions on Information Theory
Exploiting decentralized channel state information for random access
IEEE Transactions on Information Theory
Opportunistic transmission scheduling with resource-sharing constraints in wireless networks
IEEE Journal on Selected Areas in Communications
MAC Protocols for optimal information retrieval pattern in sensor networks with mobile access
EURASIP Journal on Wireless Communications and Networking
Energy efficiency of a per-hop relay selection scheme for sensor networks using cooperative MIMO
International Journal of Sensor Networks
Fast multiple access selection through variable power transmissions
IEEE Transactions on Wireless Communications
Optimal timer based selection schemes
IEEE Transactions on Communications
IEEE Journal on Selected Areas in Communications - Special issue on simple wireless sensor networking solutions
A time-varying opportunistic approach to lifetime maximization of wireless sensor networks
IEEE Transactions on Signal Processing
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We consider distributed information retrieval for sensor networks with cluster heads or mobile access points. The performance metric used in the design is energy efficiency defined as the ratio of the average number of bits reliably retrieved by the access point to the total amount of energy consumed. A distributed opportunistic transmission protocol is proposed using a combination of carrier sensing and backoff strategy that incorporates channel state information (CSI) of individual sensors. By selecting a set of sensors with the best channel states to transmit, the proposed protocol achieves the upper bound on energy efficiency when the signal propagation delay is negligible. For networks with substantial propagation delays, a backoff function optimized for energy efficiency is proposed. The design of this backoff function utilizes properties of extreme statistics and is shown to have mild performance loss in practical scenarios. We also demonstrate that opportunistic strategies that use CSI may not be optimal when channel acquisition at individual sensors consumes substantial energy. We show further that there is an optimal sensor density for which the opportunistic information retrieval is the most energy efficient. This observation leads to the design of the optimal sensor duty cycle.