Patent ID: 6819708
Filing Date: 2004-11-16
Classification: H04L

Abstract:
An Orthogonal Complex Quadrature Phase Shift Keying (OCQPSK) modulating apparatus, comprising:an OCQPSK modulating block and a FIR filtering block in a synchronous mobile station, said OCQPSK modulating block having a PN spreader block for performing PN spreading and a complex adder block for performing complex-multiplying based on OCQPSK modulating scheme; a Walsh covering block for receiving 1-bit input data from four channels and Walsh-covering the input data and for outputting eight 1-bit data to the PN spreader block; the FIR filtering block comprising two 1-bit input FIR filters, each FIR filter receiving four data among the spreaded results received from the PN spreader block and performing four 1-bit input 1:4 interpolation in a single structure and then producing four outputs in n-bit shape, respectively; a gain multiplying block for multiplying the eight outputs received from each FIR filter by gain allocated to respective channels; and a channel adder block for adding the eight outputs received from the gain multiplying block by every two channels and producing four outputs to the complex adder block to enable the complex adder block to produce an I channel signal and a Q channel signal.