Chapter 4Orthogonal Frequency Division Multiplexing

Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation technique that has recently found wide adoption in a widespread variety of high-data-rate communication systems, including digital subscriber lines, wireless LANs (802.11a/g/n), digital video broadcasting, and now WiMAX and other emerging wireless broadband systems such as the proprietary Flash-OFDM developed by Flarion (now QUALCOMM), and 3G LTE and fourth generation cellular systems. OFDM’s popularity for high-data-rate applications stems primarily from its efficient and flexible management of intersymbol interference (ISI) in highly dispersive channels.

As emphasized in Chapter 3, as the channel delay spread τ ...

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