基于FPGA的光OFDM研究
[Abstract]:As an important pillar industry of economy and society in the 21 st century, communication network has brought great changes to the global economy and society. With the development of high definition video, online games and other services, and the gradual implementation of "three networks integration" and the new deal of the Internet of things, the bearing pressure of the existing transmission network is gradually increasing. High capacity, low cost and high reliability are the basic requirements of next generation network. Orthogonal Frequency Division Multiplexing (OFDM) technology is a multi-carrier modulation technology, and its subcarriers are orthogonal to each other, so that the subcarrier signals of multi-channel OFDM can be transmitted in the same fiber channel, thus improving the spectrum efficiency of the signals. It has the advantages of high signal rate, anti-interference, dispersion compensation and so on. With the gradual maturity and improvement of DSP, high-speed optical OFDM is possible and the cost of implementation is greatly reduced. This can meet the requirements of high speed, low cost and high reliability of the future network. In this paper, the basic principle of OFDM technology is studied to realize high speed and real time optical OFDM signal modulation. The signal modulation method, system structure and optical OFDM system parameters are compared and analyzed. The main work and achievements are as follows: (1) the principle of OFDM technology and the key technologies of modulation are studied, and its mathematical model is analyzed and deduced. It paves the way for the modulation of each part of the OFDM signal. On the basis of the development of optical network at present, the advantages that it can become the leading technology in real-time optical communication in the future are analyzed. (2) the design of OFDM signal transmitter is studied. At present, most of the experiments in China are focused on the traditional off-line processing and low-order modulation. In this design, the advanced Xilinx Virtex5 series FPGA is used for high-speed signal processing, and the real-time on-line processing function of the transmitter is realized. By using the combination of high-order 16QAM and 1024 point IFFT, the transmission rate of single block FPGA can reach 2.5 GB / s, and the higher rate can be achieved if multiple blocks are parallel. Compared with off-line processing equipment, it has lower cost, which is beneficial to commercialization in the future. (3) the real-time optical OFDM system of 2.5Gb/s is built and its transmission performance is simulated. It includes the analysis of transmission rate, transmission distance and carrier number. The experimental results show that the system performance is the best when the FFT is set to 1024 points, the total number of subcarriers of OFDM is 512, and the fiber length is 1km.
【學(xué)位授予單位】:大連工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TN791;TN929.53
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