摘要移动通信和互联网的高速发展，使得人们对宽带无线接入技术的要求越来越迫切。人们期望，未来移动通信系统（4G）能够提供更高的数据速率，支持更多的用户并且满足各种业务的不同服务质量（QoS）要求。正交频分服用（OFDM）技术能够更充分地利用有限的频谱资源提供可靠的宽带数据业务，已成为当前研究的热点，被认为是4G以及未来宽带无线通信系统最有希望的物理层技术。65850

针对未来通信系统频谱有限的特点，如何将有限的资源高效且合理地分配给系统中的用户是新一代通信系统的热点研究方向。本文针对多用户OFDM系统提出了一种实时业务资源分配算法。该算法利用物理层的信道状态信息，在满足各用户最小传输速率要求的情况下，最小化系统消耗总功率。仿真结果表明，该算法能够有效降低系统消耗总功率。

毕业论文关键词：OFDM技术，实时业务，资源分配算法

毕业设计（论文）外文摘要

 Research on Resource Allocation Algorithm Based on Real-Time Traffic for OFDM System

Abstract

Rapid progress of mobile communication and internet networks in recent years has been a dramatically growing demand for wireless multimedia services requiring reliable and high-speed data transmission over a wireless channel. One of the most challenges for the future wireless communication systems is to support a large number of subscribers and to ensure the fulfillment of quality-of-service (QoS) requirement, given the limited availability of frequency spectrum. Orthogonal frequency pision multiplexing (OFDM) technologies become research hotspot recently and are known as the most promising physical technologies for 4G broadband wireless mobile communication systems.

Because the spectrum of communication system is limited in the future, resource allocation technology is a research hotspot for the next generation communication system. In this paper, we propose a resource allocation algorithm for real-time traffic in the multiuser OFDMA system. Proposed algorithm utilizes the channel state information at the physical layer and minimizes the total system power while guaranteeing the minimum transmission rate requirement for each user. The simulation results show the algorithm can reduce the total system power efficiently.

Keywords: OFDM Technology, Real-Time Traffic, Resource Allocation Algorithm

目录

第一章  绪论 1

1.1  无线通信网络综述 1

1.2  OFDM网络资源分配技术的研究现状 3

1.3 本论文研究内容和结构安排 5

第二章  无线信道和OFDM系统介绍 6

2.1 无线信道传播特性 6

2.1.1 电波基本传播机制 6

2.1.2 大尺度衰落 7

2.1.3 中尺度衰落 8

2.1.4 小尺度衰落 8

2.2 OFDM系统概述 8

2.2.1 OFDM调制与解调原理 11

2.2.2 循环前缀 13

2.2.3 OFDM系统参数选择 14

2.3 多用户OFDM系统的结构 14

2.3.1 OFDMA 14

2.3.2 OFDM-TDMA 16

2.3.3 OFDM-CDMA 16

2.3.4 OFDM-SDMA