Abstract
This paper presents implementation and validation of innovative back-channel wireless communication techniques for ultra-low power (ULP) devices. Back-channel schemes allow ULP devices that are not WiFi-compliant to communicate with already-deployed WiFi infrastructure without any hardware modification. This paper introduces an improved payload bit crafting procedure to create back-channel messages embedded in standard WiFi OFDM packets. In addition, the concept of bi-directional WiFi back-channel is newly introduced and validated in the prototype system. Using a commercial WiFi chip and Universal Software Radio Peripheral (USRP) X310 hardware platform, two downlink back-channel schemes as well as an uplink back-channel scheme are successfully demonstrated rendering realistic real-time communication performance. Field trials are performed for over-the-air wireless back-channel bi-directional communications. System characterization confirms that the proposed back-channel can operate at lower signal-to-noise ratio than what standard WiFi systems require.
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