Patent ID: 7362733

Claim:
A method of retransmitting data in a mobile communication system, the method comprising the step of: generating first coded bits by encoding information data; selectively performing at least one of the following operations of (a) outputting the first coded bits, (b) generating second coded bits by separating the first coded bits into a first bit group having a relatively high priority and a second bit group having a relatively low priority, and exchanging the first bit group with the second bit group, (c) generating third coded bits by inverting at least part of the first coded bits, and (d) generating fourth coded bits by inverting at least part of the second coded bits; generating a modulation symbol by mapping a selected one of the first coded bits, the second coded bits, the third coded bits, and the fourth coded bits to the modulation symbol using one corresponding signal constellation; and transmitting the modulation symbol to a receiver.