8-VSB
8VSB is the 8-level vestigial sideband modulation method adopted for ATSC standard of digital television in the USA. There are also the similar modulations 2VSB, 4VSB, and 16VSB.
There has been a continuing lobby for changing the modulation for ATSC to COFDM instead, the way DVB-T is transmitted in Europe, and ISDB-T in Japan. However, the FCC has continued to assert that 8VSB is the better modulation for use in U.S. digital television broadcasting. In 2000, it refused a DTV (digital television) receivers often had difficulty receiving a signal in urban environments. However, newer 8VSB receivers are far better at dealing with multipath. Moreover, 8VSB modulation requires less power to transmit a signal the same distance. In less-populated areas, 8VSB often pulls ahead of COFDM because of this. In urban areas, however, COFDM still offers better reception than 8VSB.
