| With the development of wireless communication technology, people are increasinglyattention to the transmission rate of the communication systems. The High-speed, securecommunication has become the development direction of the next-generation mobilecommunication system.Orthogonal frequency division multiplexing (OFDM) technology,its symbol periodlonger and have guard interval between symbols, there make it eliminate the Inter-SymbolInterference and Inter-channel interference in mobile communication. It has High-speedtransmission technology and effectively resistance the interference between the signalwaveform,so it is one of the core technology for next-generation mobile communicationtechnology.the baseband system OFDM is the most important part of the OFDMtransmission system,from the data processing rate, anti-jamming capability, reducehardware consumption research the baseband system of OFDM.First, analyses the basic principle of OFDM technology and the transmission ofchannel encoding and decoding technology in theory. In the channel encode technology,this thesis introduces the current application of convolutional encoding and decodingtechnology. the thesis mainly analyses encoding process, representation method thepuncture convolutional coding technology of convolutional encoding. In the decoding,westudy the better decoding performance of Viterbi decoding technology. Then, we usesWLAN technology of802.11a standard as an example, and research the realization methodand technology of each module in OFDM baseband signal processing. Each module inOFDM baseband were described Verilog-HDL under the Quartus II9.0, as ALTERA’sCycloneII series EP2C8Q208C8chip. In the Orthogonal modulation module, Compared toother Fast Fourier Transform （FFT） algorithm, choosing a new FFT algorithmbased24FFT.last, Compared to variety of binary number representation format, choose thehigher precision, simple block floating point data format, reduced the resourceconsumption.of hardware... |
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