Distributed MMSE Relay Strategies for Wireless Sensor Networks

• Published in: IEEE transactions on signal processing Vol. 55; no. 7; pp. 3336 - 3348
• Main Authors: Khajehnouri, N., Sayed, A.H.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Amplify-and-forward scheme; Applied sciences; Attenuation; Broadcasting; cooperative networks; Costs; Decoding; Detection, estimation, filtering, equalization, prediction; Exact sciences and technology; Fading; Information, signal and communications theory; Networks; Origins; Power system relaying; Propagation losses; Relay; relay networks; relay strategy; Relays; sensor networks; Sensors; Signal and communications theory; Signal detection; Signal, noise; spatial diversity; Strategy; System performance; Tasks; Telecommunications and information theory; Wireless sensor networks; Performance evaluation; relay strategy; Line of sight propagation; Relay; Multisensor; Amplify-and-forward scheme; Wireless telecommunication; Space diversity; Data transmission; relay networks; sensor networks; Data broadcast; Remote sensing; Mean square error; cooperative networks; spatial diversity; Transmission loss; Sensor array; Cost lowering; Signal detection
• ISSN: 1053-587X; 1941-0476
• DOI: 10.1109/TSP.2007.894410

A fundamental task in a wireless sensor network is to broadcast some measured data from an origin sensor to a destination sensor. Since the sensors are typically small, power limited, and low cost, they are only able to broadcast low-power signals. As a result, the propagation loss from the origin to the destination nodes can attenuate the signals beyond detection. One way to deal with this problem is to pass the transmitted signal through relay nodes. In this paper we propose and study two-hop multisensor relay strategies that achieve minimum mean-square-error (MSE) performance subject to either local or global power constraints. The capacity of the resulting relay link and its diversity order are studied. The effect of channel uncertainties on system performance is examined and a modified relay scheme is proposed.