Editing Single-frequency network (section)

==ATSC and 8VSB==
{{main article|Distributed transmission system}}
While not designed with on-channel repeaters in mind, the [[8VSB]] modulation method used in [[North America]] for digital TV is relatively good at [[phase cancellation|ghost cancellation]].  Early experiments at [[WPSU-TV]] led to an [[ATSC standard]] for SFNs, A/110.  ATSC SFNs have seen widest use in mountainous areas like [[Puerto Rico]] and [[Southern California]], but are also in use or planned in gentler terrain.<ref>{{cite web |url=http://www.rabbitears.info/oddsandends.php?request=drlist&class=DD |title = RabbitEars.Info}}</ref>

Early [[ATSC tuner]]s were not very good at handling multipath propagation, but later systems have seen significant improvements.<ref>{{cite web
|url=https://www.fcc.gov/oet/info/documents/reports/TR-05-1017-ATSC-reception-testing.pdf |title=Tests of ATSC 8-VSB Reception Performance of Consumer Digital Television Receivers Available in 2005|date=2 November 2005 |website=FCC|access-date=17 July 2023}}</ref>

Through the use of [[virtual channel]] numbering, a multi-frequency network (MFN) can appear as an SFN to the viewer in ATSC.