Ultra-wideband (UWB) technology provides an excellent means for wireless positioning due to its high resolution capability in the time domain. Its usability to resolve multipath components makes it possible to obtain accurate location estimates without the need for complex estimation algorithms. This precise location estimation capability facilitates many applications such as medical monitoring, security, and asset tracking. This paper discusses the theoretical limits of TOA estimation and TOA-based location estimation for UWB systems. Due to the complexity of the optimal schemes, suboptimal but practical alternatives are emphasized. Performance limits for hybrid TOA/SS and TDOA/SS schemes are also considered.
Bibliographical noteFunding Information:
The work of S. Gezici, H. Kobayashi, and H.V. Poor was supported in part by the National Science Foundation under Grant CCR-02-05214 and in part by the Army Research Laboratory under contract DAAD 19-01-2-0011. Z. Tian was supported by NSF Grants CCR-0238174 and ECS-0427430. G.B. Giannakis was supported by ARL/CTA Grant DAAD19-01-2-011 and NSF Grant EIA-0324864.