However, with the development of ATSC 3.0, an updated version of the American digital television standard designed for mobile reception and better single frequency network performance, the ATSC has decided to make the switch to OFDM with LDPC error correction (essentially COFDM). As a result, ATSC 3.0 will be incompatible with all current ATSC 1.0 receivers, and viewers will need a new TV with a compatible tuner or a converter box. Unlike the previous digital TV transition which was mandated by The FCC, the "transition" to ATSC 3.0 will be completely voluntary. Additionally, the FCC has required that broadcasters who decided to make the switch to ATSC 3.0 continue to make their main channel available through a simulcast agreement with another in-market station (with a similar coverage area) through at least 2022. Sinclair announced an intention to bring ATSC 3.0 to 40 cities by 2020.