Time-Reversal UWB Positioning Beacon for Railway Application

Abstract

<p align="justify"> <span style="font-family:Verdana;">This </span><span style="font-family:Verdana;">paper</span><span> </span><span style="font-family:Verdana;">studies</span><span style="font-family:Verdana;"> a new </span><span style="font-family:Verdana;">positioning</span><span style="font-family:Verdana;"> beacon</span><span style="font-family:Verdana;"> for </span><span style="font-family:Verdana;">railway</span><span style="font-family:Verdana;"> transport </span><span style="font-family:Verdana;">using</span><span style="font-family:Verdana;"> Ultra </span><span style="font-family:Verdana;">Wideband</span><span style="font-family:Verdana;"> (UWB) radio and Time Reversal (TR) techniques. UWB radio has the potential to offer a good level of performance in terms of </span><span style="font-family:Verdana;">localization</span><span style="font-family:Verdana;"> accuracy. Time Reversal channel pre-filtering facilitates signal detection and also helps increasing the received energy in the targeted area. In </span><span style="font-family:Verdana;">this</span><span style="font-family:Verdana;"> paper, we evaluate the </span><span style="font-family:Verdana;">characteristics</span><span style="font-family:Verdana;"> of TR technique in terms of temporal </span><span style="font-family:Verdana;">focusing</span><span style="font-family:Verdana;">. </span><span style="font-family:Verdana;">The theoretical and simulation results for Power Delay Profile, equivalent channel model and focusing gain of TR-UWB are given</span><span style="font-family:Verdana;">.</span><span style="font-family:Verdana;"> We analyze the contribution of Time Reversal associated with UWB technology to enhance the localization resolution. The IEEE 802.15.3a</span><span style="font-family:Verdana;">channel models are used to evaluate the performance of this system</span><span style="font-family:Verdana;">. In </span><span style="font-family:Verdana;">terms</span><span style="font-family:Verdana;"> of </span><span style="font-family:Verdana;">localization</span><span style="font-family:Verdana;"> error, the </span><span style="font-family:Verdana;">theoretical </span><span style="font-family:Verdana;">and simulation </span><span style="font-family:Verdana;">results</span><span style="font-family:Verdana;"> show that TR-UWB technique delivers improved performance over the UWB </span><span style="font-family:Verdana;">localization</span><span style="font-family:Verdana;"> approach.</span><span></span> </p> <p> <span></span> </p

Time reversal for ant trails in wireless networks

“…Similarly to [4] guide the 'navigator'. As in [7], these beacons are 'virtual' and generated by distant nodes thanks to Time Reversal focusing technique. Finally, to ensure that TRAT is compatible with wireless standards using OFDM [14] [15], Maximum Ratio Transmission, as a variant of Time Reversal, is used on a subset of sub-carriers [12].…”

“…Also, highly complex triangularization techniques are required to cope with complex environments undergoing strong multipath, such as indoor. Recently, [7] has proposed to replace physical kilometer markers on the railway tracks to facilitate tracks maintenance, by virtual electromagnetic beacons which are created by radio transmitters placed outside the railway. Time Reversal is used to generate the focused beacons.…”