FPGA Implementation On OFDM Baseband System Applied To Low Voltage Power Line Communication

Power line communication is a kind of technology which uses the existing low voltage power lines network for data transmission, it has been paid more and more attentions as its advantages of simplicity and convenience in distributing network and lower cost, and it is considered to be a broadband access technology with very promising prospect. OFDM (orthogonal frequency division multiplexing) is used as modem technology of power line communication due to its advantages such as the high rate of spectrum usage efficiency and the strong ability to against multi-path fading, etc. Therefore, the development and progress of OFDM technology accelerated the pace of power line communication in practical application.Firstly, this paper introduces the domestic and international development status of the power line communication and the advantages and disadvantages of OFDM technology. Secondly, the principle of OFDM is discussed, the application of IFFT/FFT in OFDM system, guard interval & cyclic prefix are presented, at the same, gives the basic model of OFDM system. Then the FPGA development process is described and the FPGA chip and EDA tools used in the system are introduced. Thirdly, the overall program of OFDM transmission system is illustrated and gives the basic parameters and data structure of the system. Then Focus on the baseband part of the overall program .A design and implementation of each module in the baseband transmission system has been accomplished on Altera's FPGA, including scrambling, convolutional encode, interleaving, mapping, pilot insertion, IFFT, add cyclic prefix in the transmitter and synchronization, FFT, demapping, deinterleaving, Viterbi decode in the receiver, at the same time, gives the simulation results under Quartus II of each module. Then describes the transmitter and receiver integration of each module, and give their register transfer level synthesis netlist and the occupation of FPGA resources and the corresponding simulation results. Finally, summaries full paper, points out the inadequacies which need to be improved in the paper and indicates the directions of future research.