Performance of MC-MC CDMA Systems with Nonlinear Models of HPA

TL;DR

This paper analyzes the performance of MC-MC CDMA systems using nonlinear models of high power amplifiers, specifically focusing on improving TWTA linearity with predistortion techniques.

Contribution

It introduces a predistorter linearization method based on Saleh's model to enhance TWTA performance in MC-MC CDMA systems.

Findings

Predistortion improves TWTA linearity.

Enhanced system performance with nonlinear HPA models.

Potential for high-efficiency, high-rate wireless communication.

Abstract

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.