Spatio-Temporal-Signature Signal Processing Algorithms


Christoph Steiner and Armin Wittneben


Integrated Project PULSERS Phase II, FP6-027142, Deliverable D5-3, July 2007.

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It is well known that in Ultra-Wideband (UWB) systems the channel impulse responses exhibit a large number of multipath components that can be resolved at the receiver by channel estimation. This mapping of spatial components on the temporal scale of the impulse responses leads to a very typical impulse response for each transmitter/receiver pair denoted as "Spatio-Temporal Signature". Consequently, a channel impulse response between transmitter and receiver can be interpreted as signature for their relative positions. If the position of the receiver is known, the channel impulse response indicates the position of the transmitter, and vice versa. UWB Geo-Regioning exploits this property and localises mobile UWB transmitters by means of their channel impulse responses to a static receiver. This work introduces UWB Geo-Regioning as localisation method and addresses the statistical modelling of geographic regions. Furthermore, new and very powerful Geo-Regioning algorithms are derived and analysed. The performance of these algorithms is evaluated based on the measured channel impulse responses from Deliverable D3b6a from PULSERS (Phase I). Receiver complexity issues are discussed and performance limitations of Geo-Regioning with respect to signal-to-noise ratio, observation window size, and bandwidth are investigated. It is shown that the enhanced UWB Geo-Regioning algorithms can assign UWB transmitters to a geographic region of size 27 cm times 56 cm with a probability of error of around 0.01 and reasonable receiver complexity.

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Copyright Notice: © 2007 C. Steiner and A. Wittneben.

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