Editing Orthogonal frequency-division multiplexing (section)

===Powerline Technology===
OFDM is used by many [[Power line communication|powerline]] devices to extend digital connections through power wiring. [[Adaptive modulation]] is particularly important with such a noisy channel as electrical wiring. Some medium speed smart metering [[modem]]s, "Prime" and "G3" use OFDM at modest frequencies (30–100&nbsp;kHz) with modest numbers of channels (several hundred) in order to overcome the intersymbol interference in the power line environment.<ref>{{cite conference |url=http://www.lit.lnt.de/papers/isplc_2011_hoch.pdf |last=Hoch |first=Martin |title=Comparison of PLC G3 and Prime |conference=2011 IEEE Symposium on Powerline Communication and its Applications |url-status=dead |archive-url=https://web.archive.org/web/20170810045448/http://www.lit.lnt.de/papers/isplc_2011_hoch.pdf |archive-date=2017-08-10}}</ref>
The [[IEEE 1901]] standards include two incompatible physical layers that both use OFDM.<ref>{{cite journal |title= Recent Developments in the Standardization of Power Line Communications within the IEEE |author= Stefano Galli |journal= IEEE Communications Magazine |date= July 2008 |volume= 46 |number= 7 |pages= 64–71 |doi= 10.1109/MCOM.2008.4557044 |author2= Oleg Logvinov |s2cid= 2650873 |issn=0163-6804}} An overview of P1901 PHY/MAC proposal.</ref> The [[ITU-T]] [[G.hn]] standard, which provides high-speed local area networking over existing home wiring (power lines, phone lines and coaxial cables) is based on a PHY layer that specifies OFDM with adaptive modulation and a Low-Density Parity-Check ([[LDPC]]) FEC code.<ref name="BERGU14" />