We propose an approach to energy-neutral operation by Wi-Fi beamforming for wearable devices to achieve energy-neutral operation. We take advantage of the transmit beamforming feature of IEEE 802.11ac's multiple input, single output (MISO) structure to focus the transmit power to improve the transmission distance and the harvested power level. To analyze the WiFi power distribution, we design the system model of an AP's beamforming. To empirically validate our system model, we measure the wireless power of an AP in a variety of distances. Experimental results show that wearable devices with proper sampling rates can achieve an energy-neutral operation.
['Wen-Chan Shih', 'Pai H. Chou', 'Wen-Tsuen Chen']
Empirical validation of energy-neutral operation on wearable devices by MISO beamforming of IEEE 802.11ac