ECE 445S Real-Time Digital Signal Processing Laboratory - Lecture 12 - Announcements
Prof. Brian L. Evans
Announcements: Wireless Interference
- "FAA issues 5G warning for Boeing 737s but says practical effects are limited", Reuters, Feb. 23, 2022.
- On aircraft, such as the Boeing 737, a radio altimeter uses the time taken
for a radio signal to reflect from the surface back to the aircraft to measure
the altitude of the aircraft.
- The Federal Communications Commission (FCC) reserves the 4.2-4.4 GHz band
for exclusive use by radar altimeters.
- Many altimeters were manufactured to use spectrum outside their allocated band,
including the nearby 3.7-3.98 GHz band (C band) that was rolled out for 5G use in 2022.
- FCC announced that the incumbent satellite TV operators in the 3.7-3.98 GHz band would move
to the 4.0-4.2 GHz band by the end of 2021
[Ref]
- FCC auctioned in 2020 the 3.7-3.98 GHz spectrum for use in cellular communications
starting in 2022.
[Ref]
- "FAA to require airplanes to upgrade altimeters by early 2024",
Sue Merek, Fierce Wireless, Jan. 9, 2023.
- "FAA says $26M will cover costs to prevent 5G interference"
Sue Merek, Fierce Wireless, Jan. 11, 2023.
- "An entire village lost its broad
band at the same time every day for 18 months. Now we know why",
Jack Guy, CNN, Sep. 22, 2020
- "USB 3.
0* Radio Frequency Interference on 2.4 GHz Devices",
Intel, May 2012
- Microwave oven
interference for Wi-Fi on smart phones, Keysight Technologies, March 2, 2020,
video demo, start at the 0:51 mark
- Reflections of the transmitted signal by reflectors in the environment (e.g. nearby metal fences)
that are in the transmission band as well as adjacent bands (due to passive intermodulation)
Last updated 01/16/23.
Send comments to
bevans@ece.utexas.edu