Patent ID: 7680213

Claim:
An apparatus, comprising: a receiver configured to receive a complex sequence of binary digits corresponding to symbols of a higher order modulation, the symbols corresponding to constellation points of the higher order modulation, wherein the apparatus is a first quadrature phase shift keying (QPSK) modulating apparatus of two QPSK modulating apparatuses; a first mapping unit configured to map the symbols of the higher order modulation to first constellation points of the QPSK modulating apparatus in order to provide an output signal of the first QPSK modulating apparatus which is added to an output signal of a second QPSK modulating apparatus of the two QPSK modulating apparatuses, in order to generate the constellation points of the higher order modulation; and a first weighting unit configured to apply first weights when mapping the symbols of the higher order modulation to the first constellation points of the first QPSK modulating apparatus, wherein the second QPSK modulating apparatus comprises a second mapping unit configured to map the symbols of the higher order modulation to second constellation points of the second QPSK modulating apparatus and output the output signal of the second QPSK modulating apparatus corresponding to the second constellation points, and a second weighting unit configured to apply second weights when mapping the symbols of the higher order modulation to the second constellation points of the second QPSK modulating apparatus, wherein the first weights of the first QPSK modulating apparatus are two times higher than the second weights or half of the second weights applied by the second QPSK modulating apparatus.