A Ranging Method with IEEE 802.11 Data Frames for Indoor Localization

Abstract

Abstract-IEEE 802.11 networks constitute a suitable infrastructure for accurate indoor positioning. However, existing approaches based on fingerprinting present drawbacks that make them not suitable for most of applications. This paper presents an innovative TOA-based ranging technique over IEEE 802.11 networks intended to be the essential step of an indoor location system. This approach is based on round trip time measurements using standard IEEE 802.11 link layer frames and a statistical post-processing to mitigate the noise of the measurements. A prototype has been implemented in order to assess the validity and evaluate the performance of the proposed technique. First results show ranging accuracies of less than one meter of error in LOS situations.

UWB-Based Time-of-Arrival Ranging System for Multipath Indoor Environments

“…In this laptop, all signals are postprocessed in Matlab to produce the distance estimation. The delays in the signals produced by the transmitter and receiver circuits have been estimated by means of a calibration procedure similar to [14]. The SMF, LE and SMSLE algorithms are applied to the received signals in order to produce an estimation of the distance between transmitter and receiver.…”

Improving the Performance of TOA Over Wireless Systems to Track Mobile Targets

“…In addition, the RTT measurement mechanism adds extra noise due to its own resolution limitations and hardware delays. The consequence is that TOA cannot be accurately estimated from one single RTT measurement; the approach used to cope with this issue requires performing a large number of RTT measurements to statistically mitigate the noise [4,5], increasing the time needed to obtain a pseudo-distance, and as a result, limiting the possibility of achieving short tracking response times (i.e. small latencies).…”

“…In most proposals, TOA is obtained by performing frame exchanges between the wireless nodes instead of direct measurement in order to avoid the need for time synchronization between nodes, typically performed as Round Trip Time (RTT) measurements (see [3][4][5][6] as representative proposals).…”

Schedule-based sequential localization in asynchronous wireless networks

“…For this scenario, numerous time-based localization technologies have been applied in the literature, including commercial communication infrastructure, such as wireless local area networks [23] and personal area networks [24,25], as well as specialized ranging and positioning systems such as chirp spread spectrum [26]. In this context, the impulse-radio ultra-wideband (IR-UWB) technology, cf.…”