Satellite communication transmitter

An earth station transmitter device arranged for generating a signal to be transmitted to an earth station receiver device of a satellite communication system, said earth station transmitter device comprising:

• shaping encapsulation means for
• shaping downlink data traffic based on an estimate of a total bit rate available for said downlink data traffic and
• encapsulating said downlink data traffic based on a first modulation and coding decodable by an earth station receiver device,
• said shaping encapsulation means arranged to output downlink baseband frames,
• further encapsulation means arranged to receive said downlink baseband frames and to generate uplink baseband frames by segmenting said downlink baseband frames based on a second modulation and coding decodable by a satellite receiver device,
• encoding and modulation means for converting said uplink baseband frames into an uplink transmission signal using said second modulation and coding decodable by said satellite receiver device.