extract the technical feature from following and make a list: A method comprising:
composing, by a processor, a symbol sequence that includes at least two pilot symbols configured to convey coarse frequency and timing synchronization information, and modulation parameters followed by a plurality of data symbols; and
transmitting the symbol sequence on a broadcast channel with a pilot-signal bandwidth that is narrower than a channel raster bandwidth of the broadcast channel.
 Please answer in JSON format.
user