Patent ID: 7016658

Claim:
A method for providing first and second interleaved bit streams to a modulator in order to transmit the first and second interleaved bit streams through at least two antennas in a mobile communication system including an encoder for encoding a transmission data stream at a given coding rate into a first bit stream with first priority and a second bit stream with second priority being lower than the first priority, an interleaver for interleaving the first and second bit streams and generating the first and second interleaved bit streams, and the modulator for modulating the first and second interleaved bit streams by a given modulation scheme, the method comprising the step of: generating a combination of at least one of a first combination bit streams representing a combination of bits from the first interleaved bit stream, a second combination bit streams representing a combination of bits from the second interleaved bit stream, and a third combination bit streams representing a combination of bits from the first interleaved bit stream and the second interleaved bit stream according to power condition information of the respective antennas, wherein the number of bits in each of the first, second and third combination bit streams is determined according to the modulation scheme.