Title :
Effect of baseband clipping in wideband CDMA system
Author :
Väänänen, Olli ; Vankka, Jouko ; Halonen, Kari
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
In a WCDMA system the downlink signal has typically a high peak to average ratio (PAR). In order to achieve a good efficiency in the power amplifier the PAR must be reduced i.e. the signal must be clipped. A mathematical model for signal quality metrics error vector magnitude and peak code domain error as a function of the clipping ratio is derived and tested through simulations in the case of baseband clipping. The model can be used for adjusting the clipping level in a WCDMA base station so that the downlink signal still fulfils the specifications.
Keywords :
broadband networks; code division multiple access; land mobile radio; multiuser channels; radio networks; spread spectrum communication; PAR; WCDMA base station; baseband clipping; clipping ratio; downlink signal; error vector magnitude; mathematical model; peak code domain error; peak to average ratio; power amplifier efficiency; signal quality metrics; simulations; wideband CDMA system; wideband code division multiple access; Base stations; Baseband; Broadband amplifiers; Downlink; Mathematical model; Multiaccess communication; Peak to average power ratio; Power amplifiers; Testing; Wideband;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2002 IEEE Seventh International Symposium on
Print_ISBN :
0-7803-7627-7
DOI :
10.1109/ISSSTA.2002.1048581
