Title :
WCDMA power amplifier requirements and efficiency optimization criteria
Author :
Lilja, H. ; Mattila, H.
Author_Institution :
Nokia Mobile Phones, Oulu, Finland
Abstract :
In this paper the WCDMA mobile transmitter requirements are studied. HPSK modulation method with multicode transmission capability has been adopted for the WCDMA system. Power amplifier requirements and efficiencies are studied with the measured class-AB HBT amplifier. In order to achieve long talk times for WCDMA terminal, it is essential that efficiency is optimized for medium power levels. However, it is also identified that power amplifier efficiency is important at the maximum output powers, because otherwise too much thermal heating occurs. This paper also proposes a procedure for WCDMA talk time standardization.
Keywords :
channel capacity; code division multiple access; mobile radio; phase shift keying; radio transmitters; HPSK modulation method; WCDMA power amplifier; class-AB HBT amplifier; efficiencies; efficiency optimization criteria; maximum output powers; medium power levels; mobile transmitter requirements; multicode transmission capability; talk time standardization; Filters; Frequency; Heterojunction bipolar transistors; Multiaccess communication; Phase modulation; Power amplifiers; Power generation; Power measurement; Pulse shaping methods; Telecommunication standards;
Conference_Titel :
Microwave Symposium Digest, 1999 IEEE MTT-S International
Conference_Location :
Anaheim, CA, USA
Print_ISBN :
0-7803-5135-5
DOI :
10.1109/MWSYM.1999.780331
