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Cooperative Synchronization and Channel Estimation in Wireless Sensor Networks  

Oh Mi-Kyung
Ma Xiaoli
Giannakis Georgios B
Park Dong-Jo
Publication Information
Journal of Communications and Networks / v.7, no.3, 2005 , pp. 284-293 More about this Journal
Abstract
A critical issue in applications involving networks of wireless sensors is their ability to synchronize, and mitigate the fading propagation channel effects. Especially when distributed 'slave' sensors (nodes) reach-back to communicate with the 'master' sensor (gateway), low power cooperative schemes are well motivated. Viewing each node as an antenna element in a multi-input multi-output (MIMO) multi-antenna system, we design pilot patterns to estimate the multiple carrier frequency offsets (CFO), and the multiple channels corresponding to each node-gateway link. Our novel pilot scheme consists of non-zero pilot symbols along with zeros, which separate nodes in a time division multiple access (TDMA) fashion, and lead to low complexity schemes because CFO and channel estimators per node are decoupled. The resulting training algorithm is not only suitable for wireless sensor networks, but also for synchronization and channel estimation of single- and multi-carrier MIMO systems. We investigate the performance of our estimators analytically, and with simulations.
Keywords
Channel estimation; Cramer-Rao bound; multi-input multi-output (MIMO); sensor networks; synchronization;
Citations & Related Records

Times Cited By Web Of Science : 5  (Related Records In Web of Science)
Times Cited By SCOPUS : 11
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