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I/Q Multiport Sensing Feasibility on Ambient Wireless Energy

This paper presents a multiport sensing system composed of a multiport sensor node and an I/Q multiport receiver. The sensor node comprises a sensor under test and a reference. It is fed by a 100 KHz data rate BPSK signal. The change in reflections that occurs in the sensor (I path) modulates the envelope of the BPSK signal. The receiver is based on a six-port direct demodulator where the I/Q components are obtained using the differential approach to the detected power at the four outputs of the six-port. The real-time measurement results of the demodulated I/Q components give the magnitude and phase variation (sensing) of the sensor in relation to the reference. These results establish the feasibility of using ambient wireless RF energy such as: TV, cellular, and Wi-Fi transmissions in passive sensing. Thus, we avoid overcrowding the available spectrum and facing the expensive process of generating radio waves.