Bridging the Performance Gap Between Two-Way and One-Way CSI-Based 5 GHz WiFi Ranging

Indoor Localization is gaining increased importance due to numerous location-based services in healthcare, logistics, and security, name few, that are expected be provided by next-generation wireless networks. Such characterized stringent accuracy requirements, short response time, lower cost which makes the localization problem more challenging deserving of attention. A key element process distance estimation (also known as ranging). In this paper, we design analyze an efficient decimeter-level two-way ranging scheme for ubiquitous WiFi networks 5 GHz frequency band whose approaches ideal one-way with no phase mismatches. We investigate idea channel (CFR) stitching across non-contiguous channels how CFR measurements help achieving coherency necessary accurate ranging. addition, quantify decrease compared SNR degradation, Line-of-Sight (LoS) component shrinkage, doubling multipath delay spread. Furthermore, a novel bridge performance gap between operates three main steps: square-root CFR, followed unwrapping, finally deep fade detection errors correction. Our proposed achieves significant gains over only slight from Moreover, our enjoys robustness it preserves various communication scenarios when operating at different levels, models, bandwidths, well under system impairments such Sample Timing Offset (STO). The achieved schemes demonstrated using both simulations in-house testbed. Finally, added complexity show insignificant MUSIC super-resolution steps confirms practical viability scheme.