Simultaneous localization and clock synchronization (apparently only offsets are estimated) in wireless networks

Y. Liu, Y. Shen, D. Guo and M. Z. Win, Network Localization and Synchronization Using Full-Duplex Radios, IEEE Transactions on Signal Processing, vol. 66, no. 3, pp. 714-728, DOI: 10.1109/TSP.2017.2770090.

Both localization and synchronization of mobile nodes are important for wireless networks. In this paper, we propose new methods for network localization and synchronization (NLS) using full-duplex radios through only two frames of transmission. Specifically, all nodes simultaneously transmit their signature signals in the first frame, while receiving others’ signals via full-duplex radios. In the second frame, nodes transmit either scrambled versions of their received signals in the first frame or a digital packet of the channel parameter estimates of the received signals. We develop distributed algorithms to estimate the arrival times of different components in the received signals. These arrival times are then used to determine the local network geometry and clock offsets. The Cramér-Rao lower bounds for internode distances and clock offsets are derived, and the former can be translated into error bounds of the node positions. Compared with conventional frequency division duplex or time-division duplex, we demonstrate the high efficiency of NLS using full-duplex radios, revealing its potential beyond data communications in future wireless networks.

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