We take it completely for granted now. You walk into a café, open your laptop, and you are instantly connected to the digital universe. No cables, no hassles. But if you rewind to the early 1990s, the idea of fast, reliable indoor wireless internet was widely considered an impossible pipe dream by the world’s biggest tech companies.
The breakthrough didn’t come from Silicon Valley. It came from the CSIRO (the Commonwealth Scientific and Industrial Research Organisation)—Australia’s national science agency—and, surprisingly, it started with a search for exploding black holes.
In the late 1980s and early 1990s, the tech industry was trying to figure out how to transmit large amounts of data without wires. The problem wasn’t sending the signal; it was what happened to the signal once it hit an indoor environment.
Radio waves bounce off walls, floors, furniture, and people. This creates an effect called multipath propagation, or reverberation.
Think of it like this: Imagine trying to have a clear conversation with someone across a massive, empty warehouse while they yell at you through a megaphone. The echoes overlap, distorting the sound until it becomes an unintelligible mess.
For computers trying to send high-speed data, this indoor “echo” scrambled the information packets, making the connection slow, unstable, and completely impractical for commercial use.
Enter a team of brilliant minds at the CSIRO’s Radiophysics division, led by radio astronomer Dr John O’Sullivan, alongside Dr Terry Percival, Diet Ostry, Graham Daniels, and John Deane.
Years earlier, O’Sullivan and his colleagues had been working on radio astronomy experiments, searching for the faint, elusive radio signals emitted by exploding mini black holes. To find these signals, they had to sort through massive amounts of cosmic static and “clean up” radio waves that had been distorted across billions of light-years of space. To do this, they heavily utilised a complex mathematical tool known as the Fast Fourier Transform (FFT).
While they didn’t end up finding those specific black holes, they realised the incredibly powerful signal-processing techniques they had built to clean up cosmic distortion could be applied to a completely different problem down on Earth: the indoor Wi-Fi echo.
Instead of trying to force one massive, high-speed data stream through the indoor clutter (which just amplified the echo problem), the CSIRO team did something radically different:
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They split the data into thousands of smaller, parallel sub-signals.
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They transmitted these sub-signals simultaneously across multiple radio frequencies.
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They used their FFT mathematical chips at the receiving end to filter out the scrambled echoes and perfectly reassemble the data.
This technique made wireless local area networks (WLAN) just as fast and reliable as the physical ethernet cables of the era.
The CSIRO team successfully built a working prototype and filed for a provisional patent in Australia in 1992, with the landmark US patent granted in 1996.
To commercialise the chip, a spin-off company called Radiata Inc. was founded alongside researchers from Macquarie University. They created the first commercial chipsets built on the global IEEE 802.11a standard, proving to the world that the technology worked.
However, because the CSIRO’s core technology was eventually baked into the global industry standards for Wi-Fi, many of the world’s largest tech giants began using the tech in billions of laptops, routers, and phones without paying for a licence.
This sparked a massive, multi-year legal battle. The CSIRO stood its ground against a consortium of tech behemoths, ultimately winning a series of landmark legal settlements that brought in over $430 million AUD in licensing revenue to the Australian agency.
Today, the core technology patented by those five Aussie scientists is embedded in more than 15 billion devices worldwide. Dr John O’Sullivan went on to receive the Prime Minister’s Prize for Science in 2009 and the European Patent Office’s European Inventor Award in 2012.
The story of Wi-Fi is the ultimate testament to the value of “blue-sky” research. By funding scientists to look for dying stars and black holes in the depths of space, Australia accidentally unlocked the key to the modern, interconnected world.
How often do you think about the history behind your daily tech?
