| With the fast development of wireless mobile communication technology, the number of users and business lines of traditional communication system are ever increasing, so that its capacity can not satisfy the requirement of communication any more. At the same time, the bandwidth re source is limited, and the problem of system capacity can not be solved just by increasing the number of channels. Realizing the maximum capacity of communication, improving the speed and quality of multimedia services and realizing the ubiquitous, high quality, low latency and the high rate of mobile multimedia transmission technology are more and more urgent. In the actual communication system, QAM modulation is a kind of high power efficiency modulation technique which supports high information transmiss ion rate. Besides, it has higher band efficiency and flexibility than other modulations, so QAM modulation technology will be getting more and more attention in the future communication system.The high QAM transport system studies in this thesis supports not only the QAM modulation transmission but also some other modulation transmission, such as QPSK. It has high spectrum efficiency. The designed high QAM baseband hardware platform is with FPGA(Xilinx FPGA chip K intex-7 series XC7K160T) and DSP(TI’s TMS320C6424) architecture, achieving the transmission and processing of baseband signal along with some peripherals. The thesis first introduces the basic principle of QAM modulation, the performance of QAM signal, the overall design of transmission system, and the overall design of each signal processing hardware platform, such as: the design of FPGA module, interface design of FPGA and peripheral circuit module, DSP module, the system clock module and clock chip design module, and the digital- to-analog/analog-to-digital conversion module etc. Finally, the debugging for each module on the hardware is completed, the debugging results are given and at last the 64 QAM communication is realized. |
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