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In 1971, India asked an IIT Delhi engineer to build its own sonar; decades later, his MIMO invention transformed 4G, 5G and Wi-Fi

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August 20, 2026
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Indian engineer and scientist Arogyaswami Paulraj’s journey from developing indigenous sonar for the Indian Navy to pioneering MIMO technology illustrates the far-reaching impact of research. His APSOH sonar project strengthened India’s underwater detection capabilities, while his later work at Stanford transformed wireless communication. MIMO became a foundation of high-speed connectivity used in 4G, 5G and Wi-Fi. Paulraj’s career highlights how persistence, fundamental research and unexpected discoveries can produce technologies that reshape everyday life.

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