spread spectrum code division multiple access
81Spectral efficiency — Spectral efficiency, spectrum efficiency or bandwidth efficiency refers to the information rate that can be transmitted over a given bandwidth in a specific communication system. It is a measure of how efficiently a limited frequency spectrum is… …
823GPP Long Term Evolution — LTE (Long Term Evolution) is the next major step in mobile radio communications, and will be introduced in 3rd Generation Partnership Project (3GPP) Release 8. The aim of this 3GPP project is to improve the Universal Mobile Telecommunications… …
83Signals intelligence — SIGINT redirects here. For the UNIX signal, see SIGINT (POSIX). RAF Menwith Hill, a large site in the United Kingdom, part of ECHELON and the UK USA Security Agreement. Signals intelligence (often contracted to SIGINT) is intelligence gathering… …
84telecommunications network — Introduction electronic system of links and switches, and the controls that govern their operation, that allows for data transfer and exchange among multiple users. When several users of telecommunications media wish to communicate with… …
85Modem — For other uses, see Modem (disambiguation). A modem (modulator demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The… …
86Orthogonales Frequenzmultiplexverfahren — OFDM (Orthogonal Frequency Division Multiplexing, deutsch: Orthogonales Frequenzmultiplexverfahren) ist als eine spezielle Implementierung der Multicarrier Modulation ein Modulationsverfahren, welches mehrere orthogonale Trägerwellen zur… …
87Carrier interferometry — (CI) is a type of spread spectrum multiple access typically employed with Orthogonal frequency division multiplexing (OFDM). CI spreading codes are commonly used to spread data symbols across multiple OFDM subcarriers for diversity benefits and… …
88Ultra-wideband — (aka UWB, ultra wide band, ultraband, etc.) is a radio technology that can be used at very low energy levels for short range high bandwidth communications by using a large portion of the radio spectrum. UWB has traditional applications in non… …
89Signals intelligence in modern history — This article is a subset article of the article Signals intelligence, which addresses the unifying conceptual and technical factors and common technologies in this intelligence discipline. This article deals with signals intelligence in the… …
90Internet sans fil — Wi Fi Le logo Wi Fi Pile de protocoles 7 • …
