Presentation Information
[B-1C-11]Experimental Evaluation of Amplitude-Only Human-Body Positioning Using Multiple SISO Channels
〇Naoki Honma1, Nagao Daiki1, Kenta Watanabe1, Kentaro Murata1, Takeshi Nakayama2, Shoichi Iizuka2, Ryosuke Otomura2 (1. Iwate University, 2. Panasonic)
Keywords:
ISAC,Wi-Fi,Human sensing,Positioning
Wi-Fi CSI-based human sensing is attracting attention as a form of integrated sensing and communication (ISAC). However, in practical communication devices, the CSI phase may not correspond to the physical propagation phase because of transmitter-receiver asynchronization and device-dependent signal processing. Therefore, positioning methods that do not rely on absolute phase information are important. This paper experimentally evaluates an amplitude-only human-body positioning method using multiple SISO channels measured by a vector network analyzer. S-parameters were measured in the 2.40 GHz band with a bandwidth of 160 MHz and 128 frequency points. Six SISO links were formed using two transmit ports and three receive ports. Four subjects were measured at three positions. Human-related non-DC components were extracted from the temporal variation of squared channel amplitudes, and the position was estimated using a TOF-based Capon spectrum. The positioning RMSEs were 0.33 m for MIMO with phase, 0.29 m for TOF with phase, and 0.31 m for TOF without phase. These results confirm that amplitude-only TOF positioning can achieve accuracy comparable to phase-based methods.