Title :
WCDMA uplink modulation scheme evolution and transmitter implementation
Author :
Lilja, Harri ; Mattila, Heikki
Author_Institution :
Nokia Mobile Phones, Oulu, Finland
Abstract :
The evolution of a WCDMA uplink modulation scheme is presented. Modulation schemes are analyzed from the power amplifier implementation point of view by comparing the RF envelopes of various modulation schemes. The power amplifier linearity requirements of different modulation schemes are compared using a measured class AB power amplifier. One of the challenges in WCDMA is the implementation of the transmitter for a WCDMA terminal supporting both speech and high-speed data. This paper proposes a transmitter architecture for optimizing the current consumption of the WCDMA terminal in both modes
Keywords :
broadband networks; code division multiple access; data communication; land mobile radio; modulation; power amplifiers; radio links; radio transmitters; radiofrequency amplifiers; voice communication; EMC performance; WCDMA terminal; WCDMA uplink modulation; current consumption optimisation; high-speed data; measured class AB power amplifier; power amplifier implementation; power amplifier linearity requirements; speech communication; third generation mobile systems; transmitter architecture; transmitter implementation; Circuits; Europe; Multiaccess communication; Power amplifiers; Power generation; Quadrature phase shift keying; Radiofrequency amplifiers; Speech; Standards development; Transmitters;
Conference_Titel :
Vehicular Technology Conference, 1999. VTC 1999 - Fall. IEEE VTS 50th
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-5435-4
DOI :
10.1109/VETECF.1999.798460
