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Device-free wireless sensing attracts enormous attentions since it senses theenvironment without additional devices. While cellular signals are goodopportunistic radio sources, the influence of inter-cell interference (ICI) onwireless sensing has not been adequately addressed. In this letter, we firstinvestigate the cause of ICI and its impact on wireless sensing. Then wepropose an ICI-free channel estimation method by reconstructing the broadcastsignals of adjacent cells and solving simultaneous equations. Wireless gesturerecognition can be greatly benefited by ICI mitigation. Finally, we build aprototype system to receive the commercial 4G-LTE signals, and demonstrate theaccuracies of wireless gesture recognition under various conditions.

ICI-Free Channel Estimation and Wireless Gesture Recognition Based on Cellular Signals