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Orthogonal frequency-division multiplexing
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===Wireless local area networks (LAN) and metropolitan area networks (MAN)=== OFDM is extensively used in wireless LAN and MAN applications, including [[IEEE 802.11|IEEE 802.11a/g/n]] and [[WiMAX]]. IEEE 802.11a/g/n, operating in the 2.4 and 5 GHz bands, specifies per-stream airside data rates ranging from 6 to 54 Mbit/s. If both devices can use "HT mode" (added with [[802.11n]]), the top 20 MHz per-stream rate is increased to 72.2 Mbit/s, with the option of data rates between 13.5 and 150 Mbit/s using a 40 MHz channel. Four different modulation schemes are used: [[BPSK]], [[QPSK]], 16-[[QAM]], and 64-QAM, along with a set of error correcting rates (1/2β5/6). The multitude of choices allows the system to adapt the optimum data rate for the current signal conditions.
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