In 1940, Austrian-born Hedy Lamarr, considered one of the sexiest actresses of her time, was also a co-inventor of frequency hopping. She, along with George Antheil, an American composer ...

A spread-spectrum system is used to spread a ... rate is much higher than the information signal bandwidth. Frequency-hopping system-Carrier-frequency shifting in discrete increments, in a pattern ...

In this section, we will review LPI signals as a prelude to our discussions about jamming them. These signals spread their energy (pseudorandomly) across a wider frequency range than required to just ...