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OFDM-MIMO system transmitter key technology research and FPGA implementation

Author: WangFei
Tutor: LiuZuo
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: OFDM Frame FPGA Digital upconversion Predistortion
CLC: TN791
Type: Master's thesis
Year: 2008
Downloads: 325
Quote: 1
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Abstract


OFDM (Orthogonal Frequency Division Multiplex) system because of its high spectral efficiency, robustness against frequency selective fading and inter-symbol interference ability and many other advantages, has been widely used in broadband high-speed data transmission system, and the OFDM and MIMO (Multi- Input Multi-Output) technology combination is also widely considered to be the key to the future of wireless communications technologies. The basic principle is that the OFDM frequency domain a wideband channel is divided into a plurality of overlapping narrowband transmission is performed in parallel subchannels, each subchannel with a sub-carrier carries data. At the receiving end, as long as each sub-carrier orthogonal subchannels, each channel can be separated data is correct, since a plurality of carriers, the bandwidth efficiency will be greatly increased. Meanwhile, OFDM can be used FFT (Fast Fourier Transform) algorithm for modulation and demodulation, very easy hardware implementation. But OFDM has the power and the peak power ratio is too large for the deviation, such as sensitive in the application when the need for using a variety of methods to overcome. For large-capacity communication machine project, University of Electronic Technology immunity laboratory studies and designed a link based on OFDM-MIMO communication system solutions, based on the complexity of the wireless channel and system data requirements, design a suitable frame structure, to be adopted to achieve the FPGA DSP hardware architecture to achieve a large-capacity communication link transceiver machine's basic functions. This large-capacity communication equipment as an important part of the project, the focus is responsible for OFDM-MIMO communication equipment transmitter key technology research and FPGA implementation algorithms, including OFDM modulation and framing, digital upconversion and the associated USB interface , DSP interface FPGA. The design of the FPGA chip using Xilinx's Virtex-II Pro series of products - XC2VP70, design platform using Xilinx's ISE series software. In this thesis, the pre-OFDM system based on the algorithm, designed to incorporate the OFDM band radiation suppression windowing modules and ease high PAPR (Peak to Average Power Ratio) problem PAPR suppression module, after programming, simulation, testing and circuit verification, and ultimately achieve the system transmitter function, so that performance meets the design requirements. Meanwhile, for the amplifier nonlinear distortion problem, this paper discusses an adaptive predistortion algorithm based on efficient FPGA implementation program for the pre-distorter in OFDM communication system application provides an effective and feasible method of hardware implementation, has practical value.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Digital circuits > Logic circuits
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