<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">García, Enrique</style></author><author><style face="normal" font="default" size="100%">Poudereux, Pablo</style></author><author><style face="normal" font="default" size="100%">Álvaro Hernández</style></author><author><style face="normal" font="default" size="100%">J.J. Garcia</style></author><author><style face="normal" font="default" size="100%">Ureña, J.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">DS-UWB indoor positioning system implementation based on FPGAs</style></title><secondary-title><style face="normal" font="default" size="100%">Sensors and Actuators A: Physical</style></secondary-title><short-title><style face="normal" font="default" size="100%">Sensors and Actuators A: Physical</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2013</style></year><pub-dates><date><style  face="normal" font="default" size="100%">10/2013</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">201</style></volume><pages><style face="normal" font="default" size="100%">172 - 181</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">In Ultra-Wideband (UWB) Local Positioning Systems (LPS), Inter-Symbol Interference (ISI), Multiple-Access Interference (MAI) and near-far effect are significant issues that can limit system performance.This paper presents a DS-UWB (Direct Sequence UWB) LPS based on FPGAs (Field-Programmable GateArray) and on commercially available Radio-Frequency (RF) modules. In contrast to other DS-UWB LPS,which uses TDMA (Time Division Multiple Access) and base-band pulses with low-repetition frequencyrates, the proposal uses QS-CDMA (Quasi-Synchronous Code Division Multiple Access) techniques withLoosely Synchronized (LS) spreading sequences. This allows to deal with ISI, MAI and near-far effect, aswell as to use very large spreading sequences to increase the processing gain.</style></abstract></record></records></xml>