Title :
A simple constant envelope modulation scheme for orthogonal multicode CDMA system
Author :
Fan, Mingxi ; Minn, Thit ; Siu, Kai Yeung
Author_Institution :
MIT, Cambridge, MA, USA
Abstract :
We propose a simple linear transformation technique to alleviate the signal envelope fluctuation in an orthogonal multicode CDMA system. This method is capable of converting the multilevel transmitted signals of multicode CDMA into a constant envelope signal, which then allows the use of efficient nonlinear power amplifiers. This feature leads to significant cost-reduction in the implementation of multicode CDMA systems in the uplink. The error performance and the overall complexity of this technique is shown to be very similar to that of a conventional orthogonal multicode CDMA system
Keywords :
cellular radio; code division multiple access; error analysis; modulation; radio transmitters; transforms; 3G systems; complexity; constant envelope modulation scheme; error performance; linear transformation technique; multilevel transmitted signals; nonlinear power amplifiers; orthogonal multicode CDMA system; signal envelope fluctuation; third generation mobile systems; uplink; Code standards; Fluctuations; Internet; Modulation coding; Multiaccess communication; Multimedia systems; Power amplifiers; Quality of service; Throughput; Transmitters;
Conference_Titel :
Info-tech and Info-net, 2001. Proceedings. ICII 2001 - Beijing. 2001 International Conferences on
Conference_Location :
Beijing
Print_ISBN :
0-7803-7010-4
DOI :
10.1109/ICII.2001.983596
