Title :
Nonlinear amplification of CDMA waveforms: an analysis of power amplifier gain errors and spectral regrowth
Author :
Braithwaite, R. Neil
Author_Institution :
Hewlett-Packard Co., Palo Alto, CA, USA
Abstract :
The effect of nonlinear amplification on CDMA waveforms is investigated. Variations in the gain of the power amplifier (PA) in response to changes in the input power are used as a measure of the nonlinearity. The relationship between Walsh code selection, data sequences, PN sequences, and the wave-shaping filter in the generation of PA gain errors is discussed. An approach for reducing spectral regrowth by introducing correlations between data sequences within different Walsh code channels is proposed
Keywords :
Walsh functions; code division multiple access; error analysis; power amplifiers; pseudonoise codes; sequences; CDMA waveforms; PN sequences; Walsh code channels; Walsh code selection; correlations; data sequences; input power; nonlinear amplification; power amplifier gain errors; spectral regrowth; wave-shaping filter; Baseband; Filters; Gain measurement; Interference; Modulation coding; Multiaccess communication; Nonlinear distortion; Power amplifiers; RF signals; Radio frequency;
Conference_Titel :
Vehicular Technology Conference, 1998. VTC 98. 48th IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-4320-4
DOI :
10.1109/VETEC.1998.686140
