Abstract: An object of the present invention is to improve transmission efficiency of a communication system for forming a transmission frame from a plurality of packets to perform communications using the transmission frame and reduce transmission power required to maintain an error rate. Headers of the plurality of packets are coupled to each other with redundancy information deleted therefrom so as to form a header part of the transmission frame. Further, payloads of the plurality of packets are coupled to each other so as to form a payload part of the transmission frame. A forward error correction code used for the header part and a forward error correction code used for the payload part are respectively attached to the transmission frame in isolation.