John O'Sullivan (engineer)
John O'Sullivan is an Australian engineer. Fourier transforms and WiFi. In 1977, John O'Sullivan, while working at the Dwingeloo Radio Observatory in the Netherlands, co-authored a paper in the Journal of the Optical Society of America titled ""Image sharpness, Fourier optics, and redundant-spacing interferometry"" with J. P. Hamaker, and J. E. Noordam. In this paper, they presented a technique for sharpening and improving picture clarity in radio astronomy images. In the early 1990s, O'Sullivan led a team at the CSIRO which patented, in 1996, the use of a related technique for reducing multipath interference of  radio signals transmitted for computer networking. This technology is a part of all recent WiFi implementations. As of April 2012, the CSIRO has earned over $430 million in royalties and settlements arising from the use of this patent as part of the 802.11 standards with as much as a billion dollars expected after further lawsuits against other parties. O'Sullivan joined Morse Micro in 2019. The Sydney-based company is developing a Wi-Fi microprocessor, now known as Wi-Fi HaLow.