Patent ID: 8181099

Claim:
A transmission device in a communication system in which a systematic code obtained by systematic encoding of information bits into which dummy bits are inserted and by deletion of the dummy bits from results of the systematic encoding is transmitted and, on a receiving side, the dummy bits deleted on a transmitting side are inserted into the received systematic code and then decoding is performed, the transmission device comprising: a dummy bit size decision portion, which decides a size of dummy bits for insertion into information bits based on a specified code rate, transmission rate or bit length which determines the transmission rate; a segmentation portion, which, when a total size of the information bits and the dummy bits is greater than a stipulated size, segments the information bits into a number of code blocks; a dummy bit insertion portion, which inserts dummy bits into the segmented information bits in conformity with a predetermined dummy bit insertion pattern; a systematic code generation portion, which performs systematic encoding of the information bits into which the dummy bits are inserted, and also deletes the dummy bits from the results of the systematic encoding to generate a systematic code; and a transmission portion, which transmits the systematic code.