摘要

相比于带宽受限的FDMA和TDMA系统，CDMA系统能够提供足够大的系统容量，其主要受限制于系统所受干扰，降低干扰可以直接增加系统的通信容量。由于对CDMA系统采用同时同频载波，控制各移动台的功率就是实现最大容量的关键，可以通过功率控制技术将移动台之间的干扰减到最小，实现信道的最大容量。

本论文将从多个方面逐步深入地对CDMA系统功率控制技术进行研究，其中包括CDMA技术原理的论述，CDMA技术的历史与研究现状，CDMA系统功率控制技术的原理与分类，CDMA系统功率控制技术应用与优缺点，CDMA系统功率控制技术存在问题等方面分析，并完成CDMA系统功率控制技术下的DS-CDMA性能系统误码率仿真。

本文还将介绍CDMA系统功率控制技术的发展趋势，提出自己粗略的见解，针对目前功率控制技术的存在问题进行分析和探讨解决的方法。

关键词：CDMA，CDMA系统功率控制，前向功率控制，反向功率控制。

Abstract

Compared to the bandwidth-limited FDMA and TDMA systems, CDMA systems can provide a large enough system capacity is mainly affected by the restrictions suffered interference in the system, reducing the interference can directly increase the communication capacity of the system. CDMA system using the same frequency carrier,the power to control the mobile station is the key to achieve maximum capacity, power control technology to minimize interference between the mobile station, the maximum capacity of the channel.

From many aspects of this thesis, the gradual deepening of the power control of CDMA systems research, including the exposition of the principle of CDMA technology, the History and Present Study of CDMA technology, CDMA systems principles and classification of power control, CDMA systems, power control technology applications and the advantages and disadvantages of CDMA system power control technology CDMA system bit error rate, frame error rate in the role, and complete simulation of the bit error rate performance of DS-CDMA system under power control of CDMA systems.

This article also describes the CDMA system power control technology trends, to make their own rough ideas, analysis and discussion of the solution on the line for the power control technology problems.

Key words: Code Division Multiple Access,The CDMA System Power Control ,Forward Link Power Control， Backward Link Power Control