Performance Analysis and Compensation of the Multi-Code CDMA System with Non-linear Amplifier
Dong Gu Kim, Cheol Yong An, Dong Seung Gwon, Han Gyu Park · 1999
Multi-code CDMA (MC-CDMA) was proposed technique to provide variable rate services with different quality requirements by assigning a number of codes to a user. MC-CDMA system can be integrated easily with a conventional system, and achieve good spectral efficiency and high processing gain. But it suffers from the increase of peak-to-average power ratio. In the paper, we analyzed the effect of the non-linearity of an amplifier on MC-CDMA system and verified it through simulation over the frequency flat fading and multipath fading channels. Also, it is shown that the use of adaptive predistorter can significantly reduce the effect of an amplifier. The system performance is compared when different number of codes and different values of input backoff are used.