Title :
Investigation of Polar Transmitters for WCDMA Handset Applications
Author :
Huang, Yonghui ; Mikkelsen, Jan Hvolgaard ; Larsen, Torben
Author_Institution :
Dept. of Electron. Syst., Aalborg Univ.
Abstract :
The polar transmitter is an attractive architectural solution for high-efficiency multi-mode handset applications. For the polar transmitter the design of a wide-band phase modulator is a challenging task especially for WCDMA signals. In this work the WCDMA signal is analyzed and based on this a method for solving the frequency jump problem is proposed. This method makes it possible to use a two-point ¿¿ controlled fractional-N PLL as the phase modulator in polar transmitters for WCDMA. Simulation results in Matlab and ADS show that the proposed pre-processing can reduce the frequency dynamic range and solve the frequency jump problem. This pre-processing degrades the ideal WCDMA signal by a 26dB APCR degradation. There is still 17dB margin to spectral mask requirements.
Keywords :
code division multiple access; mobile handsets; modulators; phase locked loops; radio transmitters; sigma-delta modulation; WCDM handset applications; WCDMA signals; frequency dynamic range; frequency jump problem; multimode handset applications; phase locked loop; polar transmitters; two-point sigma-delta controlled fractional-N PLL; wide-band phase modulator; wideband code division multiple access; Degradation; Frequency; Multiaccess communication; Phase locked loops; Phase modulation; Signal analysis; Signal design; Telephone sets; Transmitters; Wideband;
Conference_Titel :
Norchip Conference, 2006. 24th
Conference_Location :
Linkoping, Sweden
Print_ISBN :
1-4244-0772-9
DOI :
10.1109/NORCHP.2006.329267
