Title :
The impact of nonlinear amplification on multi-code CDMA systems
Author :
Guo, Nan ; Milstein, Laurence B.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA
Abstract :
This paper investigates the behavior of multi-code DS/CDMA systems in the presence of nonlinear distortions caused by high power amplifiers. A technique that uses a small number of parallel transmitted sequences is proposed for combating the nonlinearity. This technique can be modified to have a constant envelope for achieving further performance improvement. It is seen from performance comparisons that the proposed scheme is very effective for combating the nonlinearity
Keywords :
code division multiple access; land mobile radio; multiuser channels; nonlinear distortion; power amplifiers; radiofrequency amplifiers; sequences; spread spectrum communication; WCDMA; coherent maximum likelihood detector; constant envelope; high data-rate transmission; high power amplifiers; mobile terminal; multi-code DS/CDMA systems; nonlinear amplification; nonlinear distortions; parallel transmitted sequences; peak-to-average power ratio; performance improvement; uplink; High power amplifiers; Integrated circuit modeling; Linearity; Maximum likelihood detection; Maximum likelihood estimation; Multiaccess communication; Nonlinear distortion; Peak to average power ratio; Power system modeling; Wideband;
Conference_Titel :
Communications, 2000. ICC 2000. 2000 IEEE International Conference on
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-6283-7
DOI :
10.1109/ICC.2000.853655
