多载波码分多址系统调制器研究

Study on the Modulator of MC-CDMA System

在多载波传输技术和码分多址技术的基础上，采用适宜于高速数据的多载波码分多址系统（MC－CDMA），这种系统与传统的直接序列码分多址（DS－CDMA）系统有“时间一频率”上的对偶关系，本文主要阐述了该系统调制器设计方案，给出了系统的发射机模型，分析了载频的选取、扩展码的选择及多载波调制的实现等．分析结果表明，MC－CDMA系统与DS－CDMA系统相比，具有频带利用率高、用户客量大、抗ISI能力强等优点．

Based on the technology of multi-carrier and spread spectrum, a system called Multi-carrier Code Division Multiple Access (MC-CDMA) is applied to transwit high rate data. MC-CDMA (in frequency) is dual to traditional DS-CDMA (in time). Its basic modulator scheme is provided in this paper, and the concrete designs are analyzed in detail such as the choice of carrier frequency, the selection of codes and the implementation of multi-carrier modulation. The analytical results indicate that MC-CD-MA system is prior to DS-CDMA system.