Device and method for I/Q modulation, frequency translation and upsampling

摘要

A device for modulating a carrier signal comprises a mapper generating a baud rate data signal at a first data value frequency. A complex mixer and an upsampling device are used to increase the data value frequency and spectrum shift the data signal. A finite impulse response filter operating on the data signal to generate filtered first signal with characteristics that provide for reduced side band noise when the filtered signal is mixed to generate a quadrature amplitude modulated carrier.