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1、DUBLIN CITY UNIVERSITYSCHOOL OF ELECTRONIC ENGINEERINGSimulation of a Multiple Input Multiple Output(MIMO) wireless systemJohn FitzpatrickTC452140938April 2004B.EngINTelecommunications EngineeringSupervised by Dr. Conor BrennanSimulation of a MIMO wireless system John FitzpatrickAcknowledgementsI wo
2、uld like to thank my supervisor Dr. Conor Brennan for his guidance, assistance andapproachability throughout this project. I would also like to thank John Diskin for his workon the ray tracing program. Finally I would like to thank my parents and Laura for theirsupport throughout my project.Declarat
3、ionI hereby declare that, except where otherwise indicated, this document is entirely my ownwork and has not been submitted in whole or in part to any other university.Signed: .iiDate: .Simulation of a MIMO wireless system John FitzpatrickAbstractThis project explores the development of a multiple i
4、nput multiple output (MIMO) simulatorusing ray tracing techniques. This project gives an overview of ray tracing techniques,beamforming, MIMO channel models and MIMO systems. It explains the ability of MIMOsystems to offer significant capacity increases over traditional wireless systems, byexploitin
5、g the phenomenon of multipath. By modelling high frequency radio waves astravelling along localized linear trajectory paths, they can be approximated as rays, just as inoptics.The radio environment is then represented using a ray tracing C+ program. I highlightsome of the different approaches used t
6、o realize a MIMO system, the most important beingthe Singular Value Decomposition (SVD). I illustrate the development of the MIMOsimulator, through explanations of the techniques and algorithms I developed and used.These algorithms model the system under ideal conditions with no noise distortions. I
7、 showthe use of the MIMO simulator created, and investigate the MIMO channel. The resultsobtained show the affects of changing the different parameters of the system on the MIMOchannel and the radio environment.Finally, in the conclusion, I discuss the future of MIMO systems and recommend furthermod
8、ifications, which could be made to the MIMO simulator, to create a more accurate andefficient system.iiiSimulation of a MIMO wireless system John FitzpatrickTable Of ContentsCHAPTER 1 - INTRODUCTION . 1CHAPTER 2 - TECHNICAL BACKGROUND. 22.1 MULTIPATH . 32.2 RAY TRACING . 32.3 BEAMFORMING . 42.4 LINE
9、AR ARRAYS. 62.5 MIMO . 72.5.1 MIMO Transmission. 82.5.2 The MIMO Channel H. 92.6 GAUSSIAN ELIMINATION. 102.7 SINGULAR VALUE DECOMPOSITION (SVD) . 12CHAPTER 3 IMPLEMENTATION OF RAY TRACING . 133.1 RAY TRACING . 143.1.2 The ray tracing program . 143.2 CONVERGENCE OF ORDER . 26CHAPTER 4 - IMPLEMENTATION OF MIMO SIMULATOR. 304.1 GAUSSIAN ELIMINATION. 304.2 SVD .
