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Interchannel Interference and Mitigation in Distributed MIMO RF Sensing.

Sahil Waqar¹, Matthias Pätzold¹

¹Faculty of Engineering and Science, University of Agder, 4630 Kristiansand, Norway.

Sensors (Basel, Switzerland)

|November 27, 2021

Summary

We developed a method to eliminate cross-channel interference in millimeter-wave MIMO radar systems. This technique enables precise tracking of moving targets using radio frequency sensing.

Keywords:

3D channel model FMCW RF sensing distributed MIMO interchannel interference micro-Doppler signatures millimeter wave (mm-Wave)sensor network

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Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Published on: June 25, 2021

Area of Science:

Electrical Engineering
Signal Processing
Radar Systems

Background:

Cross-channel interference is a significant challenge in Multiple-Input Multiple-Output (MIMO) radio frequency (RF) sensing systems.
Millimeter-wave (mm-Wave) MIMO systems, particularly those using Frequency-Modulated Continuous Wave (FMCW) radar, are susceptible to interference affecting subchannel performance.

Purpose of the Study:

To analyze and mitigate cross-channel interference in mm-Wave MIMO RF sensing systems.
To present a geometrical 3D channel model for simulating time-variant trajectories of moving scatterers.
To validate a novel interference mitigation technique using a commercial K-band MIMO radar.

Main Methods:

Developed a geometrical 3D channel model for simulating time-variant scatterer trajectories.
Utilized the Ancortek SDR-KIT 2400T2R4, a K-band FMCW MIMO radar, for RF data collection.
Proposed an optimal interference mitigation strategy involving induced propagation delay and range gating.

Main Results:

Successfully simulated time-variant trajectories of moving scatterers in a mm-Wave MIMO system.
Demonstrated complete elimination of cross-channel interference using the proposed propagation delay and range gating method.
Validated the effectiveness of the solution on the Ancortek SDR-KIT 2400T2R4 radar system.

Conclusions:

The proposed method effectively mitigates cross-channel interference in K-band MIMO radar systems.
The solution enables the resolution of all subchannel links in distributed MIMO configurations.
This advancement allows for robust MIMO RF sensing to track moving targets irrespective of their motion direction.