Patent ID: 7095290
Filing Date: 2006-08-22
Classification: H04B,H04L

Abstract:
1. Method for generating higher order modulations with QPSK modulators wherein a complex-valued input chip sequence is split into real and imaginary parts by a splitter and input to QPSK modulators in which the sequence is mapped to constellation points, multiplied with weighting coefficients in first multipliers, outputs of the multipliers are pulse shaped and supplied to second multipliers for multiplication by cos (ωt) and −sin(ωt), respectively, and the outputs of these multipliers are summed by an adder, thereby generating a resulting signal of the QPSK modulators, the resulting signal is spread by multiplying it with spreading code, constellation points of higher order modulation are mapped to inputs of the QPSK modulator, and, after modulation and spreading, QPSK symbols are summed to compose symbols of higher order modulation.