Implementation Of System Level Simulation Platform For The Uplink Of LTE-A System And Its Techniques' Study

In order to defeat the WiMAX and other mobile broadband wireless access technology's competition and take over the market of 4G, evolved 3G system has achieved a revolution in mobile communications ever since 3GPP proposed Long Term Evolution Project. With the rapid development of LTE,3GPP has passed the LTE-Advanced research project in March 2008.3GPP use the evolved technologies such as carrier aggregation,MU-MIMO,Coordinated Multiple Point Transmission and Reception,relay and so on to meet or exceed the ITU for IMT-Advanced (International Mobile Telecommunications-Advanced, referred to as "IMT-A") technical requirements as its 4G (Fourth Generation) candidate standard proposal, which is smoothly evolution based on LTE and featured by some advanced technologies.The topic of this paper derives from "Eleventh Five-Year" Plan key projects of National Science and Technology—"IMT-Advanced technology programs research and key technology development" which is in charge of China Academy of Telecommunication Research of the Ministry of Information Industry. The project aimed at design and implementation of LTE-A system-level simulation platform according to the IMT-A standardized framework, and evaluation of its key technologies to promote IMT-A technical proposal evaluation and LTE-A standardized process.The thesis is mainly comprised by three parts. The first section outlines the LTE-A standardization process and key technologies, and then gives a brief introduction about the system simulation methodology and related performance indicators.In the second section, a LTE-A uplink system level simulation platform is designed and constructed. First describe the test scenarios and simulation parameters, then design and implementation of each functional module according to the basic communication process.The third section focuses on the research of some key technologies of LTE-A. The system module and the basic principle analysis of Coordinated Multiple Point Transmission and Reception are given. Simulation results show that COMP can improve the average and 5% edge users'Spectrum Efficiency greatly. The second part emphasizes on the matching algorithm of MU-MIMO. The paper analyzes the performance of three different scheduling algorithms. The last part focuses on power control schemes of MU-MIMO. Based on the traditional fractional power control scheme, an improved algorithm is proposed. This method gives an amendment on traditional power control through adjusting the power of paired users which are separated as center users and edge users. Simulation results show that the new power control algorithm can achieve better performance in tradeoff between sector throughput and ICI.