Title :
Multicarrier QAM modulator
Author :
Vankka, Jouko ; Kosunen, Marko ; Halonen, Kari
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Finland
Abstract :
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
Keywords :
FIR filters; code division multiple access; modulators; quadrature amplitude modulation; spread spectrum communication; transceivers; FIR filters; IF signal; digital modulator; error vector magnitude specification; in-phase data streams; interpolation chain; multicarrier QAM modulator; numerically controlled oscillator; phase accumulator; quadrature data streams; root raised cosine filter; sine/cosine memory; spectrum specification; transmitter specification; upconversion circuits; wideband CDMA system; Band pass filters; Base stations; Baseband; Broadband amplifiers; Circuits; Frequency control; Multiaccess communication; Oscillators; Power amplifiers; Quadrature amplitude modulation;
Conference_Titel :
Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5471-0
DOI :
10.1109/ISCAS.1999.780030
