TY - JOUR
T1 - Cooperative synchronization and channel estimation in wireless sensor networks
AU - Oh, Mi Kyung
AU - Ma, Xiaoli
AU - Giannakis, Georgios B
AU - Park, Dong Jo
PY - 2003/12/1
Y1 - 2003/12/1
N2 - 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 TDMA fashion, and lead to low-complexity estimators because CFOs and channels 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-carrier MIMO systems. We investigate the performance of our estimators analytically, and with simulations.
AB - 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 TDMA fashion, and lead to low-complexity estimators because CFOs and channels 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-carrier MIMO systems. We investigate the performance of our estimators analytically, and with simulations.
UR - http://www.scopus.com/inward/record.url?scp=4143131984&partnerID=8YFLogxK
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M3 - Conference article
AN - SCOPUS:4143131984
SN - 1058-6393
VL - 1
SP - 238
EP - 242
JO - Conference Record of the Asilomar Conference on Signals, Systems and Computers
JF - Conference Record of the Asilomar Conference on Signals, Systems and Computers
T2 - Conference Record of the Thirty-Seventh Asilomar Conference on Signals, Systems and Computers
Y2 - 9 November 2003 through 12 November 2003
ER -