KEYWORDS: Signal processing, Signal detection, Control systems, Denoising, Sensing systems, Prototyping, Neural networks, Field programmable gate arrays, Process control
Many real-time cognitive sensing signal processing and control applications require low SWAP edge processors with ultra-low latency adaptation and learning capabilities along with strict throughput, accuracy and power requirements. Achieving 3rd generation AI capabilities, i.e., real-time contextual adaptation, requires fast adaptive inference operations at low power beyond what is achievable with currently available neural networks and deep learning systems. While there has been tremendous progress in the form of edge accelerators, today’s processors lack capabilities for real-time processing, adaptation to novel situations, and low latency decision making. This paper addresses currently unsolved critical challenges in real-time cognitive sensing and autonomous system control applications, such as ultra-wide bandwidth and real-time signal denoising, anomaly detection, blind signal separation, and adaptive system equalization and control. We also present experimental results for low Cost – Size Weight and Power (C-SWAP) hardware implementation of an edge processor prototype implemented on a commercially available FPGA board.
Phase change materials (PCM) provide unique optical characteristics, such as a dramatic change in optical refractive index <1, not obtainable from conventional semiconductor optical materials such as Si and InP. Thus, PCMs are being explored to program and reconfigure optical devices to adapt to the sensing needs per the environment. Also, the nonvolatile nature of PCM devices offers system integration without disturbing the sensing. An example of a PCM-based optical device can be a spatial light modulator (SLM) that enables a coded aperture imaging technique to extract spectral signature for remote detection and identification without platform motion. SLMs offer a way to carry out spectral imaging with reconfigurability, which allows signature detection against a spectrally cluttered background. Here, we report on a new solid-state optical modulator device with a SbTe PCM operating in the infrared range and at cryogenic temperatures with excellent switching cycle reliability for the programming of PCM-based optical devices.
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