Multicarrier QAM modulator

A multicarrier QAM modulator has been developed and simulated. The multicarrier QAM modulator contains four upconversion circuits. Each upconverting circuit accepts 12 b in-phase and quadrature data streams, interpolates those by 16 and upconverts the baseband signal to a selected center frequency. The outputs of these upconverting circuits are combined together in the digital domain. The multicarrier QAM modulator was designed to fulfil the spectrum and error vector magnitude (EVM) specification of the wideband code division multiple access (WCDMA) system.