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  2. Space–time block code - Wikipedia

    en.wikipedia.org/wiki/Space–time_block_code

    Space–time block coding is a technique used in wireless communications to transmit multiple copies of a data stream across a number of antennas and to exploit the various received versions of the data to improve the reliability of data transfer. The fact that the transmitted signal must traverse a potentially difficult environment with ...

  3. Marconi Wireless Telegraph Company of America - Wikipedia

    en.wikipedia.org/wiki/Marconi_Wireless_Telegraph...

    The Marconi Wireless Telegraph Company of America (commonly called American Marconi) was incorporated in 1899. It was established as a subsidiary of the British Marconi Company and held the U.S. and Cuban rights to Guglielmo Marconi 's radio (then called "wireless telegraphy") patents. American Marconi initially primarily operated high-powered ...

  4. Radio spectrum - Wikipedia

    en.wikipedia.org/wiki/Radio_spectrum

    The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz ). Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication. To prevent interference between different users, the generation and transmission of radio ...

  5. Near-field communication - Wikipedia

    en.wikipedia.org/wiki/Near-field_communication

    Near-field communication ( NFC) is a set of communication protocols that enables communication between two electronic devices over a distance of 4 centimetres (1.6 in) or less. [1] NFC offers a low-speed connection through a simple setup that can be used for the bootstrapping of capable wireless connections. [2]

  6. Amphetamine - Wikipedia

    en.wikipedia.org/wiki/Amphetamine

    Amphetamine [note 2] (contracted from a lpha - m ethyl ph en et hyl amine) is a central nervous system (CNS) stimulant that is used in the treatment of attention deficit hyperactivity disorder (ADHD), narcolepsy, and obesity. Amphetamine was discovered as a chemical in 1887 by Lazăr Edeleanu, and then as a drug in the late 1920s. [25]

  7. CTIA (organization) - Wikipedia

    en.wikipedia.org/wiki/CTIA_(organization)

    CTIA is a trade association representing the wireless communications industry in the United States. The association was established in 1984 and is headquartered in Washington, D.C. It is a 501 (c) (6) [1] nonprofit membership organization, [2] [3] [4] and represents wireless carriers and suppliers, and manufacturers and providers of wireless ...