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A MIMO Radar Signal Processing Algorithm for Identifying Chipless RFID Tags.

Chen Su¹, Chuanyun Zou¹, Liangyu Jiao¹

¹School of Information Engineering, Southwest University of Science and Technology, Mianyang 621010, China.

Sensors (Basel, Switzerland)

|December 28, 2021

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This study introduces a new anticollision method using multiple-input, multiple-output (MIMO) radar for identifying multiple chipless radio-frequency identification (RFID) tags. The algorithm successfully distinguishes and reads unique IDs from closely spaced tags, overcoming limitations of traditional methods.

Area of Science:

Electrical Engineering
Radar Systems
Wireless Communication

Background:

Conventional chipped RFID tag identification relies on ASICs, which struggle with multiple tags in proximity.
Distinguishing multiple chipless RFID tags simultaneously presents a significant challenge in wireless identification systems.

Purpose of the Study:

To develop and validate an anticollision algorithm for identifying multiple chipless RFID tags using MIMO radar signal processing.
To demonstrate the capability of MIMO radar in retrieving tag IDs and their spatial information.

Main Methods:

Employing multiple-input, multiple-output (MIMO) radar signal processing as an anticollision methodology.
Utilizing beamforming techniques to steer antenna arrays and capture backscattered signals from chipless RFID tags.

Keywords:

MIMO algorithm azimuth estimation chipless radio-frequency identification (RFID) tag multi-tag identification

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Retrieving the radar cross-section (RCS) of tags to identify their unique IDs.

Main Results:

Successfully identified unique IDs of two distinct chipless RFID tags in a simulation.
Demonstrated that MIMO radar can distinguish tags with a spatial separation of 0.88 m in azimuth from a distance of 3 m.
Validated the algorithm's effectiveness in retrieving tag RCS and associated IDs.

Conclusions:

The proposed MIMO radar-based algorithm offers an effective solution for anticollision and identification of multiple chipless RFID tags.
MIMO technology provides directional information and enables robust ID retrieval for chipless tags, overcoming traditional limitations.
The simulation results confirm the practical feasibility of the developed method for real-world applications.