In a mobile communication system and method for a composite re-transmission device

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There is provided a device and method for retransmitting error-detected data in a mobile communication system. A transmitter generates S sub-codes C i (i = 0, 1, 2, ... , S-1) from a physical layer packet (PLP) information stream using quasi-complementary turbo codes, initially transmits the first sub-code C 0 , and then sequentially transmits the following sub-codes each time a retransmission request is received for the initial transmission or a previous retransmission. Upon receipt of a retransmission request for the last sub-code C S-1 , the transmitter transmits the first sub-code C 0 and then sequentially transmits the following sub-codes each time a retransmission request is received.