第四代移动通信系统

本文以基于OFDM技术的第四代移动通信系统以及合作通信系统为背景，在多用户信息论的指导下，研究这些系统中的资源优化分配问题。

In this dissertation , under the guidance of multiuser information theory , the resource optimization techniques in both OFDM systems and cooperative communication systems are intensively studied .

『正交频分复用（OFDM）技术具有很强的抗多径传播和频率选择性衰落能力，成为了第四代移动通信系统的核心技术。

Orthogonal Frequency Division Multiplexing ( OFDM ) becomes the core technology of fourth-generation mobile communication system , which has strong capacity of anti-multipath spread and frequency selective fading .

首先提出了第四代移动通信系统（4G）的主要技术目标，并对第四代移动通信系统（4G）采用的网络构架进行了介绍。

Main technology aims of 4G mobile communication system are presented and the network structure of 4G mobile communication system is introduced .

正交频分复用技术（OrthogonalFrequencyDivisionMultiplexingSystem，OFDM）因为其频谱利用率非常高，可以有效对抗无线信道的多径衰落，已经成为第四代移动通信系统中的主流技术。

Orthogonal frequency division multiplexing ( OFDM ) has been regarded as a core technique for the fourth generation ( 4G ) mobile communication system , due to its advantage of high data rates in multipath fading environments .

本文从基本概念、接入系统、关键技术等几个方面全面介绍了第四代移动通信系统，并简单介绍了OFDM技术在第四代移动通信中的应用。

In this paper , the fourth generation mobile communication system is introduced from the aspect of basic concept , access system and key technology , and the application of OFDM in 4G is simply presented .

目前，LTE-A已经成为第四代移动通信系统IMT-Advanced的重要候选标准。

Now , LTE-A has become the most important candidate standard of the fourth generation mobile communication system , IMT-Advanced .

正交频分复用（OFDM）技术因具有高速传输数据能力，高频谱利用率，抗多径干扰能力强等优点被认为是第四代移动通信系统的核心技术之一。

Orthogonal frequency division multiplexing ( OFDM ) is considered as one of the core technologies of the fourth generation mobile communication systems due to its high-speed data transmission ability , high bandwidth efficiency and robustness to multi-path interference .

MIMO技术与OFDM技术结合，成为4G移动通信中有效对抗频率选择性衰落、提高数据传输速率、增大系统容量的关键技术，是第四代移动通信系统研究的热点问题。

The combination of OFDM and MIMO will conquer the frequency selected fading , increase the data transmission rate and improve the system capacity ; it is the hot question of the mobile communication in 4G .

实践证明，正交频分复用（OFDM）技术与多址技术的综合形成的OFDMA技术，可以有效提高系统整体性能，被普遍认为是第四代移动通信系统的核心解决方案。

OFDMA , which combines Orthogonal Frequency Division Multiplexing ( OFDM ) with multiple acess , is the core technique of the fouth generation communication system . It can improve the whole system very much .

MIMO-OFDM技术不仅能提高频谱效率，而且具有良好的抗多径干扰能力，已成为第四代移动通信系统的关键技术之一，但有些关键问题需要进一步的完善。

MIMO - OFDM is one of the key techniques of 4G for its higher spectral efficiency and the ability to combat multi-path fading . But some key problems still need to be optimized .

交织多址（IDMA）作为第四代移动通信系统的关键技术之一，成为近年来研究的热点之一。

Therefore , interleave-division multiple-access ( IDMA ), proposed as one of the key technologies in 4G , has become a popular research topic .

OFDM以其可有效对抗ISI，频谱利用率高，实现简单等优点，正受到人们越来越广泛的关注，被认为是第四代移动通信系统（4G）的支撑技术。

OFDM is an attractive technology for its high immunity to ISI , high spectrum efficiency and low computational complexity , and is considered as an important technology in the Forth Generation ( 4G ) Mobile Networks .

当前，3G网络的部署和商业化日渐成熟，通信界的关注点已经转移到第四代移动通信系统LTE-Advanced的标准制定和产业部署上。

At present , with the maturity of 3G network deployment and commercialism , the communication industry focus has shifted to the standard formulation and industrial deployment of the fourth generation mobile communication system LTE-Advanced .

为了实现移动宽带化，在未来的第四代移动通信系统里采用了大量无线通信新技术，如MIMO技术、OFDM技术、智能天线技术等，这些技术都已成为当前研究的热点。

In order to realize mobile broadband , many novel technologies are applied in the future mobile communication systems , namely the fourth generation wireless mobile communication system ( 4G ), such as MIMO , OFDM , and smart antenna . These technologies are becoming the hot issues .

MIMO-OFDM技术将成为第四代移动通信系统中有效对抗频率选择性衰落，提高数据传输速率，增大系统容量的关键技术。

MIMO-OFDM technology , which can cope with frequency selective fading , increase data rate and system capacity effectively , will be the key technology of 4G mobile communication system . Firstly , an overview of wireless fading channel is given .

多输入多输出（MIMO）技术在通信系统的频谱利用率和信道容量方面性能卓越，并有效地对抗无线信道衰落的影响，将成为第四代移动通信系统的关键技术之一。

Multiple-Input Multiple-Output ( MIMO ) system achieves high performance in the area of frequency spectrum usage and channel capacity , and it effectively against the effect of wireless fading channel . MIMO system has become the most superior and important technology in the 4th generation of mobile communication system .

第四代移动通信系统的跨层设计研究

Study on Cross-Layer Design for the Fourth Generation Mobile Communication System

第四代移动通信系统及其关键技术研究

Analysis of 4G Mobile Communication System and Its Key Technologies

第四代移动通信系统是多功能集成的宽带移动通信系统，它将以宽带、接入因特网、具有多种综合功能的系统形态出现。

Technology of Accessing Internet with Narrowband and Wideband Networks It is an integrated communication system including broadband , Internet access and many other integrated functions .

无线通信是当今最活跃的科研领域之一，为达到现代通信的要求，提出了第四代移动通信系统。

Today , wireless communication is one of the most active research areas . In order to achieve the requirements of modern communication , a fourth generation mobile communication systems have been proposed .

结合当前的发展趋势阐述了第四代移动通信系统的概念、目标要求和具体特点，并对第四代移动通信系统中可能采用的一些关键技术进行了讨论。

In combination with the present trend , it expounds the concept , goal requirement and specific features of the fourth generation mobile communication system , discusses the key techniques possibly used by the fourth generation mobile communication system .

近年来，无线通信正以前所未有的速度飞速发展，现有的通信网络已经无法满足用户对于数据传输速率的要求，因此人们把越来越多的关注放在第四代移动通信系统上。

In recent years , Wireless communication is developing very fast . Data transmission rate in the existing communication networks can no longer meet customers ' requirements . Therefore , people pay close attention to the fourth generation mobile communication system .

作为向第四代无线移动通信系统演进的重要技术，采用OFDM技术为核心的LTE系统已经做好了各方面的理论准备，正在向实现阶段迈进。

As the most significant technology in the evolution from the third generation to the fourth generation wireless system , LTE system , which adopted OFDM as the core technology , has completed the theory preparation , and proceeds to the implementation .

可将这两种技术有机地结合起来构成MIMO-OFDM系统，该系统能够有效地提高频谱效率和提升系统容量。目前该技术已经成为第四代无线移动通信系统的物理层中的关键技术之一。

The MIMO-OFDM Systems which is combined by the two technologies can improve spectrum efficiency and improve system throughput , and it has become one of the key technologies in physical layer of the fourth-generation wireless mobile communications .

随着通信技术的不断发展，MIMO-OFDM技术已成为第四代（4G）移动通信系统的关键技术之一。

With the continuous development of communication technology , MIMO-OFDM technology has become one of the key technologies of the forth generation ( 4G ) mobile communication systems .

作为第四代（4G）移动通信系统的关键技术之一，MIMO-OFDM技术正成为通信信号处理领域的研究热点技术。

As one of the key technologies of the fourth generation ( 4G ) mobile communication systems , MIMO-OFDM technology has been widely applied in communication signal processing in recent years .

第四代移动通信（4G）系统的无线接入网如果沿用传统蜂窝结构，很难满足设计要求。

It 's quite difficult to meet the requirement of the fourth generation mobile communication ( 4G ) system if its radio access network ( RAN ) adopts traditional cellular architecture .

为了应对这种局面，国际电信联盟（ITU）提出了第四代（4G）移动通信系统，即IMT-Advanced（InternationalMobileTelecommunications-Advanced）系统。

In order to deal with these requirements , the fourth generation ( 4G ) mobile communication system , i.e. IMT-Advanced ( International Mobile Telecommunications-Advanced ) system , is proposed by the International Telecommunication Union ( ITU ) .

随着数据通信与多媒体业务的发展，用户对高速移动数据业务的需求不断增长，面向移动数据、移动计算及移动多媒体的第四代移动通信<E-Advanced无线通信系统开始兴起。

Along with the fast development of data communications and multimedia services , as well as the increasing demand for high mobility services , the fourth generation mobile communication - LTE-Advanced facing mobile computing and mobile multimedia , began to rise .

未来的第二代无线局域网和第四代移动通信系统等采用MIMO技术将是大势所趋。

Thus , we predict that MIMO technique will certainly achieve an extensive range of applications in future wireless accesses such as wireless local network ( WLAN ), and4G mobile communication systems .