| 摘要 |
<p>A satellite direct radio broadcast system (10) is provided which assembles bits of broadcast programs into prime rate increments, several of which are assembled into a frame. Frames are divided into symbols which are demultiplexed into alternating ones of a plurality of prime rate channels. The broadcast channel frame is encoded for forward error correction (FEC) using a R-1/2 Viterbi coder or a R-3/4 Viterbi coder, depending on the desired bit rate for a time division multiplexed (TDM) stream comprising the broadcast channel. A broadcast station (23) is configured to format FEC-encoded broadcast channel frames into TDM frames when transmission of the TDM frames by a transparent payload on board a satellite (25) is used.</p> |
