Patent ID: 8874985

Claim:
A communication system comprising a transmission device and a reception device, wherein the transmission device comprises: a turbo coding unit configured to code first bits for a retransmission signal, the coding being performed with a first constraint length different from a second constraint length, the second constraint length being used in a past transmission; and a transmission processing unit configured to transmit the retransmission signal generated from the coded first bits, wherein the turbo coding unit is configured to determine the first constraint length based on information indicating convergence of a turbo code, the information being any one of: the number of retransmissions; the number of retransmissions and a coding rate; the number of reception antennas of the reception device; a modulation level; an overlapping bandwidth; and a bandwidth to be clipped, wherein the reception device comprises a decoding unit configured to perform turbo equalization using second bits decoded with a third constraint length different from a fourth constraint length, the fourth constraint length being used in a past reception, the second bits being bits of the retransmission signal.