Gregory Raleigh
| Gregory G. Raleigh | |
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| Born | 1961 Orange, California, U.S. |
| Nationality | American |
| Fields | Telecommunications |
| Alma mater | Stanford University, California Polytechnic State University |
| Known for | Inventor of the MIMO technology used in Wi-Fi and 4G wireless standards |
Gregory “Greg” Raleigh (born in Orange, California in 1961), is an American radio scientist, inventor, and entrepreneur who has made contributions in the fields of wireless communication, information theory, and network virtualization. His discoveries and inventions include the first wireless communication channel model to accurately predict the performance of advanced antenna systems, the MIMO-OFDM technology used in contemporary Wi-Fi and 4G wireless networks and devices, and a cloud-based Network Functions Virtualization platform for mobile network operators that enables users to customize and modify their smartphone services.
Raleigh received a B.S.E.E. degree from the California Polytechnic State University, an M.S.E.E. degree from Stanford University, and a Ph.D. from Stanford University. He joined Watkins-Johnson Company in 1984 as a Radio Engineer and rose to Chief Scientist and Vice President of Research and Development. Raleigh subsequently co-founded three companies: Clarity Wireless, Airgo Networks, and ItsOn.
In wireless communications, Raleigh developed a comprehensive and precise channel model that works with multiple antennas. He employed the model to develop smart antenna signal processing techniques for rapid fading, multipath propagation, and frequency-division duplex environments. As a result of this research, Raleigh found that multipath propagation could be exploited to greatly increase the capacity of wireless communications, enabling data rates competitive with wire-based networks. In a paper prepared for the 1996 GLOBECOM conference in London, Raleigh presented the first rigorous mathematical proof that in the presence of naturally occurring multipath propagation multiple antennas may be used with special signal processing techniques to transmit multiple data streams at the same time on the same frequency, multiplying the information-carrying capacity (data rate) of wireless links. From the time of Guglielmo Marconi, multipath propagation had always been treated as a problem to be overcome. The discovery that multipath can be harnessed to increase performance reversed a century of radio engineering practice. In subsequent papers, Raleigh proposed a series of enhancements including the use of OFDM with MIMO and techniques for space-frequency coding, space-frequency-time channel estimation, and MIMO synchronization. These inventions were incorporated into the LTE, WiMAX, 802.11n and 802.11ac standards.
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