Patent ID: 8867332

Claim:
An apparatus for data transmission in a multi-antenna system, the apparatus comprising: a modulation mapper for modulating a first codeword and a second codeword into first modulation symbols and second modulation symbols respectively, wherein the first modulation symbols are constituted in the order of a modulation symbol having a first modulation order and a modulation symbol having a second modulation order, and the second modulation symbols are constituted in the order of a modulation symbol having the second modulation order and a modulation symbol having the first modulation order; a layer mapper for mapping, on a codeword basis, the first modulation symbols to a first layer and for mapping the second modulation symbols to a second layer; and a layer permutator for mapping, on a modulation symbol basis, the modulation symbol having the second modulation order in the first layer to the second layer and the modulation symbol having the first modulation order in the second layer to the first layer.