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Express Logic develops, markets and supports the ThreadX® real-time operating system (RTOS), NetX™ TCP/IP networking stack, USBX™ USB stack, and FileX® embedded file system, and PrismX™ GUI toolkit for embedded applications.
ThreadX is a royalty-free, full source code, small-footprint, low-overhead RTOS that is extremely easy to learn and use. ThreadX is one of the most widely deployed RTOS products in the world, with over 800 million products based on ThreadX.
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 Definition: Orthogonal frequency-division multiplexing (OFDM) — essentially identical to Coded OFDM (COFDM) and Discrete multi-tone modulation (DMT) — is a frequency-division multiplexing (FDM) scheme utilized as a digital multi-carrier modulation method.
A large number of closely-spaced orthogonal sub-carriers are used to carry data.
The data are divided into several parallel data streams or channels, one for each sub-carrier.
Each sub-carrier is modulated with a conventional modulation scheme (such as quadrature amplitude modulation or phase shift keying) at a low symbol rate, maintaining total data rates similar to conventional single-carrier modulation schemes in the same bandwidth.
OFDM has developed into a popular scheme for wideband digital communication, whether wireless or over copper wires, used in applications such as digital television and audio broadcasting, wireless networking and broadband internet access.
Source: Wikipedia (http://en.wikipedia.org/wiki/OFDM)
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