基于OFDM调制方式下的协作分集方式性能仿真  

The Simulation Study of the Cooperative Diversity Based on OFDM Modulation

作　　者：冷志娟[1] 程恩[1] 孙海信[1] 苏为[1] 伊锦旺[1] 

机构地区：[1]厦门大学信息科学与技术学院水声通信与海洋信息技术教育部重点实验室,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2011年第1期24-27,共4页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金资助项目(60672046);福建省青年创新基金资助项目(2009J05155);厦门市科技计划项目(3502Z20093008);厦门大学"985"二期信息创新平台项目

摘　　要：协作分集在无线通信中应用极其广泛,正交频分复用技术(OFDM)鉴于自身优势,在系统的频谱利用率、功率利用率、系统复杂性等方面具有很强的竞争力.首先介绍了协作分集中的两种协作方式与OFDM系统框架,对比分析了解码转发与放大转发在实现各自转发上所具有的优缺点;对比分析了CRC编码OFDM系统与卷积码编码OFDM系统仿真性能,决定采用卷积码实现OFDM协作分集中解码转发法(decode and forward,DAF)的编解码,并对OFDM协作分集的两种协作方式进行了系统仿真.仿真结果表明,加入协作分集的OFDM系统,获得了显著的分集增益,系统性能得到提高.Cooperative diversity is widely used in wireless communication.On the other hand,orthogonal frequency division multiplexing（OFDM） is highly competitive due to its advantages in systematic spectral efficiency,power utilization and the systematic complexity.In this paper,two methods to realize cooperative diversity in OFDM systems and the frame of the OFDM are proposed;compared the CRC coding OFDM system with the convolutional coding OFDM system,and analyzed the performance of the CRC coding OFDM system and convolutional coding OFDM system,we decide to adopt the convolutional codes to achieve the DAF of the cooperative diversity.Two cooperative protocols in OFDM cooperative diversity system are simulated.As is showed in the simulation results,the performance of the OFDM system with the cooperative diversity accesses to a significant diversity gain.

关 键 词：正交频分复用技术 协作分集 放大转发 解码转发 

分 类 号：TN911[电子电信—通信与信息系统]