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JPL's Wireless Communication Reference WebsiteChapter: Authors and Contributors |
John Davis' research interests lie in the field of wireless communications at
the systems level. To date, he has
been involved with work at the physical level, datalink level and
network level.
At the physical level, he did both indoor and outdoor propagation measurements.
Indoor measurements were taken within Cory Hall (U.C. Berkeley) at 2.4 GHz while
outdoor measurements involved the PATH Intelligent Vehicle Highway Project and
considered propagation at 900 MHz between vehicles in single file. Both the
indoor and outdoor measurements used a network analyzer and disc-cone antennas
(omnidirectional) to measure the frequency response of a stationary environment
with a given separation distance between the receive and transmit antennas.
In both of the measurements above, time delay spread, path loss rate, and Rician
K factor were measured.
John Davis worked on network software configuration while interning at the IBM,
T.J. Watson Research Center in Yorktown Heights, NY. The job involved configuring
IBM RF wireless PCMCIA adapter cards to run TCP/IP over a wireless link. The
adapter cards allowed a wireless LAN to be set up with portable computer (most
notably, IBM's ThinkPad) and the TCP/IP configuration allowed the wireless
LAN to connect to the Internet. The adapter cards adhered to a slow frequency
hopping protocol.
Most recently, he has been working on datalink protocols for the InfoPad project.
Specifically he has been studying the Virtual Cell concept and Space Time Reservation
Multiple Access (STRMA) with intent to implement these schemes as the uplink
of the InfoPad system. STRMA and Virtual Cells provide an elegant approach to
dynamic channel allocation using decentralized control.
John Davis contributed (portions of) pages on
