  A new wireless communication system denoted as Multi-Code Multi-Carrier CDMA
(MC-MC CDMA), which is the combination of Multi-Code CDMA and Multi-Carrier
CDMA, is analyzed in this paper. This system can satisfy multi-rate services
using multi-code schemes and muti-carrier services used for high rate
transmission. The system is evaluated using Traveling Wave Tube Amplifier
(TWTA). This type of amplifiers continue to offer the best microwave high power
amplifiers (HPA) performance in terms of power efficiency, size and cost, but
lag behind Solid State Power Amplifiers (SSPA's) in linearity. This paper
presents a technique for improving TWTA linearity. The use of predistorter (PD)
linearization technique is described to provide TWTA performance comparable or
superior to conventional SSPA's. The characteristics of the PD scheme is
derived based on the extension of Saleh's model for HPA.
