https://www.atsc.org/wp-content/uploads/2018/12/A323-2018-Dedicated-Return-Channel.pdf https://www.atsc.org/wp-content/uploads/2018/12/A323-2018-De... The piec

https://www.atsc.org/wp-content/uploads/2018/12/A323-2018-Dedicated-Return-Channel.pdf https://www.atsc.org/wp-content/uploads/2018/12/A323-2018-De... The piece that talks to the broadcast towers is called the "Dedicated Return Channel" or DRC. It doesn't seem to have anything do with an existing consumer broadband connection. > Dedicated Return Channel (DRC) supports interactive services in ATSC 3.0 without dependence on other non-ATSC 3.0 network infrastructure. In ATSC 3.0, downlink broadcast channel and Dedicated Return Channel for interactive services use different RF frequencies (i.e. Frequency Division Duplexing). The PHY layer and Media Access Control (MAC) layer for DRC are defined in this specification. It uses a modified OFDMA which I think is similar to 4G LTE > The DRC uplink transmitter uses Single Carrier Frequency Division Multiple Access (SCFDMA) as the multiple access scheme. SC-FDMA is similar to Orthogonal Frequency Division Multiple Access (OFDMA) except for a Discrete Fourier Transform (DFT) operation performed before the Inverse Fast Fourier Transform (IFFT).