2020/12/02 by Anastasios Kakkavas, Kakkavas, Anastasios, Henk Wymeersch +9 · 3 citations
Computer Science · Engineering · #Network Time Synchronization Technologies #Indoor and Outdoor Localization Technologies #Underwater Vehicles and Communication Systems
paper · pdf · doi:10.48550/arxiv.2012.01590
We consider a single-anchor multiple-input multiple-output (MIMO) orthogonal\nfrequency-division multiplexing (OFDM) system with imperfectly synchronized\ntransmitter (Tx) and receiver (Rx) clocks, where the Rx estimates its position\nbased on the received reference signals. The Tx, having (imperfect) prior\nknowledge about the Rx location and the surrounding geometry, transmits the\nreference signals based on a set of fixed beams. In this work, we develop\nstrategies for the power allocation among the beams aiming to minimize the\nexpected Cram 'er-Rao lower bound (CRLB) for Rx positioning. Additional\nconstraints on the design are included to ensure that the line-of-sight (LOS)\npath is detected with high probability. Furthermore, the effect of clock\nasynchronism on the resulting allocation strategies is also studied. We also\npropose a gridless compressed sensing-based position estimation algorithm,\nwhich exploits the information on the clock offset provided by\nnon-line-of-sight paths, and show that it is asymptotically efficient.\n