Presentation 2020-01-30
A Proposal of People Counting by Using Wi-Fi Channel State Information of Mobile Devices
Masahide Mizutani, Akira Uchiyama, Tomoki Murakami, Hirantha Abeysekera, Teruo Higashino,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) People's distribution in public areas is useful for various services. Wi-Fi Channel State Information (CSI) has attracted attention as it does not require any additional deployment. However, the existing approaches assume multiple fixed infrastructures, such as Wi-Fi access points (APs). To solve this problem, we estimate the number of people (i.e., people counting) by using mobile devices and a small number of fixed APs. Since CSI represents the difference between the amplitude and the phase of the transmitted and received radio waves, we can estimate the change of the propagation environment from CSI. However, CSI is very noisy due to various factors. In this paper, we focus on Sampling frequency Offset (SFO), Carrier Frequency Offset (CFO), A/D Converter (ADC) delay and quantization error, and design methods to reduce their effects. Then, we construct a people estimation model by regression using the variance of CSI with noise removal as a location-independent feature. The evaluation results have shown that our method improves the Root-Mean-Squared-Error (RMSE) to 0.49.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Channel State Information / CSI / People Counting
Paper # SeMI2019-102
Date of Issue 2020-01-23 (SeMI)

Conference Information
Committee SeMI
Conference Date 2020/1/30(2days)
Place (in Japanese) (See Japanese page)
Place (in English)
Topics (in Japanese) (See Japanese page)
Topics (in English)
Chair Susumu Ishihara(Shizuoka Univ.)
Vice Chair Kazuya Monden(Hitachi) / Koji Yamamoto(Kyoto Univ.)
Secretary Kazuya Monden(Kyoto Univ.) / Koji Yamamoto(NTT DOCOMO)
Assistant Akira Uchiyama(Osaka Univ.) / Kenji Kanai(Waseda Univ.) / Masafumi Hashimoto(Osaka Univ.)

Paper Information
Registration To Technical Committee on Sensor Network and Mobile Intelligence
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) A Proposal of People Counting by Using Wi-Fi Channel State Information of Mobile Devices
Sub Title (in English)
Keyword(1) Channel State Information
Keyword(2) CSI
Keyword(3) People Counting
1st Author's Name Masahide Mizutani
1st Author's Affiliation Osaka University(Osaka Univ.)
2nd Author's Name Akira Uchiyama
2nd Author's Affiliation Osaka University(Osaka Univ.)
3rd Author's Name Tomoki Murakami
3rd Author's Affiliation Nippon Telegraph and Telephone Corporation(NTT)
4th Author's Name Hirantha Abeysekera
4th Author's Affiliation Nippon Telegraph and Telephone Corporation(NTT)
5th Author's Name Teruo Higashino
5th Author's Affiliation Osaka University(Osaka Univ.)
Date 2020-01-30
Paper # SeMI2019-102
Volume (vol) vol.119
Number (no) SeMI-406
Page pp.pp.17-22(SeMI),
#Pages 6
Date of Issue 2020-01-23 (SeMI)