Communication device for transmitting data to another communication device, the communication device comprising circuitry configured to obtain a truncation notification indicating that an ongoing transmission of a data unit is to be truncated; in response to the truncation notification, determine, based on the number of unprocessed modulation input bits of the data unit, a remaining bit length of a modulation input block, and perform padding to add a number of modulation padding bits corresponding to the determined remaining bit length of a modulation input block to the unprocessed modulation input bits to obtain a complete modulation input block; modulate the complete modulation input block to obtain a modulation output block; and transmit a transmit data stream containing the obtained modulation output block.