Design of WiFi-AP operating channel estimation scheme for sensor node

• Published in: 2016 Ninth International Conference on Mobile Computing and Ubiquitous Networking (ICMU) pp. 1 - 6
• Main Authors: Ishida, Shigemi, Kunihiro, Yosuke, Izumi, Kousaku, Tagashiray, Shigeaki, Fukuda, Akira
• Format: Conference Proceeding
• Language: English; Japanese
• Published: IPSJ 01-10-2016
• Subjects: Channel estimation; cross-technology signal detection; IEEE 802.11 Standard; Indexes; Interference; Mobile computing; operating channel; sensor localization; Signal detection; WiFi-AP anchors; ZigBee
• DOI: 10.1109/ICMU.2016.7742084

Sensor localization is one of the big problems when building large scale indoor sensor networks because GPS (Global Positioning System) is unavailable in indoor environments. We are developing a sensor localization system using WiFi APs as anchors, which requires no anchor deployment. Because sensor nodes cannot demodulate WiFi signals, we have developed a cross-technology RSS (received signal strength) measurement scheme with an AP recognition scheme [1, 2]. In this paper, we present WiChest, a WiFi-AP operating channel estimation scheme to accurately measure AP-RSS on sensor nodes. AWiFi channel overlaps with four ZigBee channels. AP-RSS depends on a ZigBee channel in which a sensor node measures the RSS. Using WiChest, a sensor node automatically switches its channel based on an estimated AP channel prior to RSS measurement. We implemented WiChest using a MICAz sensor node. The experimental evaluations reveal that WiChest accurately estimates AP operating channels with an F-measure of 0.80.