Tag: OFDM

via the ARRL: Just When You Thought It Was Safe: Chinese Over-the-Horizon Radar Appears on 40 Meters

The International Amateur Radio Union Region 1 (IARU-R1) Monitoring System (IARUMS) reports that one of China’s over-the-horizon radar (OTHR) installations has been causing interference in the Amateur Radio 7 MHz band. The IARUMS February newsletter reports on that intruder and others. Other top 5 intruders include a “single-letter beacon” transmitting either the letter “K” or the letter […]

via HACKADAY: AI Listens to Radio

We’ve seen plenty of examples of neural networks listening to speech, reading characters, or identifying images. KickView had a different idea. They wanted to learn to recognize radio signals. Not just any radio signals, but Orthogonal Frequency Division Multiplexing (OFDM) waveforms. OFDM is a modulation method used by WiFi, cable systems, and many other systems. In particular, they […]