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In the US, FCC part 15 on unlicensed spread spectrum systems in the 902–928 MHz and 2.4 GHz bands permits more power than is allowed for non-spread-spectrum systems. Both FHSS and direct-sequence spread-spectrum (DSSS) systems can transmit at 1 watt, a thousandfold increase from the 1 milliwatt limit on non-spread-spectrum systems.
Hedy Lamarr (/ ˈ h ɛ d i /; born Hedwig Eva Maria Kiesler; November 9, 1914 [a] – January 19, 2000) was an Austrian-born American actress and inventor. After a brief early film career in Czechoslovakia, including the controversial erotic romantic drama Ecstasy (1933), she fled from her first husband, Friedrich Mandl, and secretly moved to Paris.
In 1941, Antheil and the actress Hedy Lamarr developed a radio guidance system for Allied torpedoes that used a code (stored on a punched paper tape) to synchronize frequency changes, referred to as frequency hopping, between the transmitter and receiver. It is one of the spread spectrum techniques that became widely used in modern ...
George Antheil, U.S. patent 2,292,387 — with co-inventor Hedy Lamarr, used a code (stored on punched paper tape) to synchronize random frequencies later known as frequency hopping spread spectrum radio for jam-proof remote control of torpedoes. This work led to their posthumous induction into the National Inventors Hall of Fame in 2014. [3]
In telecommunications, especially radio communication, spread spectrum are techniques by which a signal (e.g., an electrical, electromagnetic, or acoustic) generated with a particular bandwidth is deliberately spread in the frequency domain over a wider frequency band. Spread-spectrum techniques are used for the establishment of secure ...
Frequency-hopping spread spectrum [498] 2014 Hedy Lamarr: 1914 Frequency-hopping spread spectrum [499] 2014 Howard Aiken: 1900 Automatic sequence controlled calculator (Harvard Mark I) [500] 2014 Mildred Dresselhaus: 1930 Lattice structure [501] 2014 Otis Boykin: 1920 Electrical resistor [502] 2014 Richard DiMarchi: 1952 Insulin Lispro [503 ...
1908: Frequency-hopping spread spectrum in radio work was described by Johannes Zenneck (1908), Leonard Danilewicz (1929), [60] Willem Broertjes (1929), and Hedy Lamarr and George Antheil (1942 US patent).
August 11 – Composer George Antheil and actress Hedy Lamarr are granted a United States patent [11] for a frequency-hopping spread spectrum communication system intended to make radio-guided torpedoes harder to detect. [12] October 2 – The first American-built jet aircraft, the Bell P-59 Airacomet fighter prototype, makes its first official ...