Implementation of a Directional Modulation Testbed for Reconfigurable Transmitters for Spatially Agile MIMO Systems
Jonathan E. Swindell, David W. Cox, Rebekah Edwards, Emma Lever, Adam C. Goad, Austin Egbert, Charles Baylis, Robert J. Marks II

TL;DR
This paper presents a microwave testbed for directionally modulated transmission using a reconfigurable phased array, enabling simultaneous multi-directional communication and radar signals to improve spectral efficiency.
Contribution
The paper demonstrates the implementation of a reconfigurable microwave testbed for directional modulation using a phased array and RFSoC, laying groundwork for adaptive MU-MIMO systems.
Findings
Successful demonstration of directional modulation with a two-element array
Validation of reconfigurable transmission techniques for spectral coexistence
Foundation for future adaptive MU-MIMO radar and communication systems
Abstract
This paper demonstrates the implementation and validation of a microwave testbed for directionally modulated transmission. Directional modulation enables multiple communication and/or radar signals to be transmitted in multiple directions simultaneously using a single phased array aperture, helping to relieve spectral congestion. A two-element transmitter array is driven by a Xilinx ZCU208 Radio Frequency System on a Chip (RFSoC). Our testbed provides a foundation for developing a fully reconfigurable array transmitter for multi-user multiple-input multiple-output (MU-MIMO) radar and communications, which will incorporate in-situ measurement, reconfigurable matching circuitry, and fast tuning algorithms for frequency and directional selectivity. This testbed enables development and validation of reconfigurable techniques for adaptive spectral and spatial coexistence.
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Taxonomy
TopicsRadar Systems and Signal Processing · Antenna Design and Optimization · Advanced Power Amplifier Design
