Abstract
We explore the use of synchronization bits from a standard 802.11 preamble for high-accuracy localization. The multi-tone short training field present in 802.11 standards that use a Legacy preamble is investigated in comparison to a common remote sensing waveform known as the stepped frequency waveform that shares similar waveform characteristics to the preamble. We present the 802.11 standard and the connection to the stepped frequency waveform, derive the theoretical lower bound on the short training field, present a comparison of simulated results, and present experimental wireless measurements demonstrating ranging accuracies on the order of 1.9 mm.
Highlights
In recent years there has been a surge in wireless technologies creating the Internet of Things (IoT), where common household items such as light bulbs, thermostats, and home security can be controlled and monitored remotely
We investigate the multi-tone short training field (STF) present in 802.11 standards that utilize an orthogonal frequency division multiplexing (OFDM) physical layer [25] and compare it to a qualitatively similar localization waveform, the stepped frequency waveform (SFW)
We present the 802.11 standards and the connection of the STF to the SFW, derive the theoretical lower bound of the STF, compare the theoretical bound to simulation, and present experimental measurements demonstrating ranging accuracies on the order of 1.9 mm
Summary
In recent years there has been a surge in wireless technologies creating the Internet of Things (IoT), where common household items such as light bulbs, thermostats, and home security can be controlled and monitored remotely. Nanzer: High-Accuracy Localization Using IEEE 802.11 WiFi Legacy Preamble including time domain duplexing the communications and ranging waveforms [13], using separate antennas [14], and frequency domain duplexing [15], [16] Such approaches, inherently require additional system resources, leading to a reduction in overall efficiency. To demonstrate the similarities of the localization performance of the Legacy preamble and the SFW, a simulation of the two waveforms are given in Fig. 3 where in Fig. 3(a) there is an example of an 802.11n waveform with 20 MHz of bandwidth and data on sub-carriers ±4, ±8, ±12, ±16, ±20, and ±24 Such as QAM, pulse compression of Legacy preambles is feasible when implemented in communications systems
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