A QAM modulator for WCDMA base station

Author

Vankka, Jouko ; Sumanen, Lauri ; Halonen, Kari

Author_Institution

Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland

fYear

2000

fDate

2000

Firstpage

65

Lastpage

69

Abstract

A QAM modulator has been developed and implemented with programmable logic devices (PLDs). D/A converters were implemented in 0.5 μm CMOS technology. A conventional QAM modulator needs four multipliers, two adders and sine/cosine ROMs. The designed CORDIC based QAM modulator has about same logic complexity as two multipliers and an adder with the same word sizes. The QAM modulator accepts 12 b in-phase and quadrature data streams, interpolates them by 16 and upconverts the baseband signal to a selected center frequency. The QAM modulator is designed to fulfil the spectrum and error vector magnitude (EVM) specifications of the wideband code division multiple access (WCDMA) system

Keywords

CMOS digital integrated circuits; application specific integrated circuits; code division multiple access; digital arithmetic; digital-analogue conversion; mobile radio; modulators; programmable logic devices; quadrature amplitude modulation; signal processing; 0.5 micron; CMOS technology; CORDIC based modulator; D/A converters; DAC; PLDs; QAM modulator; WCDMA base station; baseband signal upconversion; error vector magnitude specifications; interpolation; programmable logic devices; wideband CDMA system; wideband code division multiple access; Base stations; CMOS logic circuits; CMOS technology; Logic design; Logic devices; Modulation coding; Multiaccess communication; Programmable logic devices; Quadrature amplitude modulation; Read only memory;

fLanguage

English

Publisher

ieee

Conference_Titel

ASIC/SOC Conference, 2000. Proceedings. 13th Annual IEEE International

Conference_Location

Arlington, VA

Print_ISBN

0-7803-6598-4

Type

conf

DOI

10.1109/ASIC.2000.880677

Filename

880677