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Techniques known since the 1940s and used in military communication systems since the 1950s "spread" a radio signal over a wide frequency range several magnitudes higher than minimum requirement. The core principle of spread spectrum is the use of noise-like carrier waves, and, as the name implies, bandwidths much wider than that required for ...
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.
The Origins of Spread-Spectrum Communications This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on January 22, 2022. NTIA Manual of Regulations and Procedures for Federal Radio Frequency Management
Dr. Marian Rogers Croak is an American engineer known for her voice over IP (VoIP) related inventions. [1] Croak worked for three decades at Bell Labs and AT&T where she filed over 200 patents [2] and works at Google since 2014 where she is Vice President of Engineering, [3] [4] In 2022, she was inducted into the National Inventors Hall of Fame for her work with VoIP.
CDMA is a spread-spectrum multiple-access technique. A spread-spectrum technique spreads the bandwidth of the data uniformly for the same transmitted power. A spreading code is a pseudo-random code in the time domain that has a narrow ambiguity function in the frequency domain, unlike other narrow pulse codes. In CDMA a locally generated code ...
Robert Arno Scholtz (born c. 1936) is a distinguished professor of electrical engineering at University of Southern California, known for ultra-wideband and spread spectrum communications. [1] [2] A 1958 graduate and distinguished alumnus from University of Cincinnati, he obtained his PhD at Stanford University in 1964. [3]
A former technology executive has pleaded guilty to a single count of fraud involving a scheme to artificially inflate the share price of photo and video distributor , federal officials said Friday.
Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). In the most widely used mode, transmission power is limited to 2.5 milliwatts , giving it a very short range of up to 10 metres (33 ft).