Research And FPGA Simulation Implementation Of MIMO-OFDM System Transmitter Key Technologies

In the past few decades, wireless communication technology has developed very quickly and people are already quietly into the4G era. Multiple input multiple output (MIMO:Multiple Input Multiple Output) technology can not sacrifice the additional bandwidth and the power of the transmitting antenna, which greatly improve the channel capacity and spectral efficiency of the system, and orthogonal frequency division multiplexing (OFDM: Orthogonal frequency Division Multiplexing) technology has a very strong ability to combat frequency selective fading, both the perfect combination of MIMO-OFDM technology with its powerful performance has become the core technology of the fourth generation mobile communications (4G) and network access standards. So far, the MIMO-OFDM technology has won the favor of IEEE802.11n, WiMAX, WiFi,3G-LTE wireless communications standards, and has the trend of long-term development and a wide range of applications in the future.NOW, at home and abroad, many universities, research institutions, as well as the communications industry companies regard the study focused on successfully setting up the hardware platform for MIMO-OFDM. A variety of related journal articles and academic papers are frequently referred to this. The design of this paper is based on the researching background. We build on a simple2*2MIMO-OFDM transceiver platform on the basis of context of this study, and research the key technologies of the transmitter part, which has some reference significance and practical value.Primarily done in this article are as follows:The first chapter briefly describes the rise of the MIMO-OFDM technology and overview the development and research focus of the MIMO-OFDM technology at home and abroad, and then provides an overview of the main work and the arrangements of the thesis.The second chapter elaborates the basic principles of MIMO and OFDM technology and system models, as well as their advantages and disadvantages, and then analyze the basic principles of MIMO-OFDM systems, and finally build a structural model of the MIMO-OFDM transceiver system and briefly analyze the key technologies of it..The third chapter researches the part of key technologies of MIMO-OFDM system transmitter, including digital modulation, space-time coding, IFFT transform, add the cyclic prefix and windowing processing. Then compares of the existing several space-time coding techniques, establishes a program of space-time coding techniques, in-depth studies on the selected space-time block coding. All the key technologies have MATLAB software to simulate achieved.The forth chapter gives some of the relevant parameters of the transmitter on the basis of the block diagram of MIMO-OFDM system transceiver platform. And then have some of the key technologies of the transmitter part designed and implementation in FPGA, including16QAM modulation, space-time block coding, IFFT transformation, add the cyclic prefix, plus the window processing module, and gives the timing simulation waveform of each module verified.The final chapter gives the full text of the work of the generality of the summary and outlooks the next task focus, explores the future research directions of the subject.