Jeff Moss (hacker) also works with Mr. Robot's technical consulting team. DEF CON was portrayed in "The X-Files" episode "Three of a Kind" featuring an appearance by The lone gunmen. DEF CON was portrayed as a United States government-sponsored convention instead of a civilian convention. Actor Will Smith visited DEF CON 21 to watch a talk by Apollo Robbins, the gentleman thief and to study the DEF CON culture for an upcoming movie role. Jeff Moss (hacker) Jeff Moss, also known as Dark Tangent, (born January 1, 1975) is an American hacker, computer and internet security expert who founded the Black Hat and
Cyclic prefix formula_17. Cyclic prefix In telecommunications, the term cyclic prefix refers to the prefixing of a symbol, with a repetition of the end. The receiver is typically configured to discard the cyclic prefix samples, but the cyclic prefix serves two purposes: For the cyclic prefix to serve its objectives, it must have a length at least equal to the length of the multipath channel. The concept of a cyclic prefix is traditionally associated with OFDM systems, however the cyclic prefix is now also used in single carrier systems to improve the robustness to multipath propagation. A cyclic prefix is often used