Digital Modulation: OFDM Solves Mobility and High Rate Problems
High Frequency Electronics
Digital modulation has evolved over time, from the first simple on-off keying (OOK) systems for primi-tive controls to today’s high data rate WLAN and 3G wireless systems. This tutorial will briefly review the main types of digital modulation, then focus on OFDM (orthogonal frequency division multiplexing), which is a central part of new systems such as WiMax and ultra wideband (UWB).
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