Method and device for performing communication based on backscatter in wireless communication system

A communication device comprising:

• an interrogator configured to output interrogation signals including N consecutive unit chirp signals repeated for a predetermined period T and connected to each other to maintain continuous phase, and
• a backscatter tag, included in Internet-of-Things (IoT) equipment, configured to provide tag signals which are generated by frequency-modulating the interrogation signals,
• wherein the interrogator is further configured to receive the tag signals and demodulate the tag signals,
• wherein the backscatter tag is configured to frequency-modulate the interrogation signals with data collected by the Internet-of-Things equipment, without information about a channel allocated to the backscatter tag, provide the frequency-modulated interrogation signals as the tag signals, and communicate with the interrogator over the channel determined by a distance between the interrogator and the backscatter tag,
• wherein a signal generated by demodulating the tag signals is in N−1 discrete frequency components per channel,
• wherein the signal generated by demodulating the tag signals comprises a frequency component corresponding to a moving distance of the interrogation signals between the interrogator and the backscatter tag and a frequency component corresponding to a frequency modulating the interrogation signals, and
• wherein the backscatter tag operates without a battery by using power collected by energy harvesting.