Patent ID: 7899081

Claim:
A data transmission apparatus comprising: a frame generator for generating a broadcast frame including a first region for containing broadcast data and a second region for containing additional data; and a transmitter for encoding, modulating, and transmitting the broadcast frame, the transmitter comprising a slot allocator for allocating slots to the broadcast data and the additional data, wherein the broadcast frame comprises a time division multiplexing pilot (TDM Pilot) region for synchronizing receipt of the broadcast frame, the TDM Pilot region comprising a TDM Pilot 1 , a wide-area identification channel (WIC), a Local-area indication channel (LIC), and a TDM Pilot 2 that are each designated to distinctive individual orthogonal frequency division multiplexing (OFDM) symbols, each OFDM symbol including eight slots, and further wherein the slot allocator allocates unallocated slots of the WIC, LIC, and TDM Pilot 2 to the additional data.