| Summary: | 碩士 === 中華科技大學 === 電子工程研究所碩士班 === 99 === This paper discusses about the principle and structure of M-ary Quadrature Amplitude Modulation (MQAM), and then uses the results and functional block diagram deducted by MQAM equation to design and simulate the functional module by Xilinx FPGA. This study adopts the communication system of M being 4 as the example of design and simulation.
The receiving end takes Box-Muller algorithm as the technical basis to design the Xilinx FPGA Additive White Gaussian Noise (AWGN) generator. The receiver in this article adopts the way of noncoherent demodulation, while 4QAM communication system and AWGN both take the Xilinx ISE software as the design and simulation platform. And ISim simulator is used to complete the simulation of system functional modules, signal comparison and verification. The signal simulation results of 4QAM communication system in this paper prove the signal data of binary sequence could be recovered successfully and accurately. The time delay caused by the computation of the functional circuit modules can result in slight difference of signal time sequence. Moreover, after AWGN is added in the communication system, the ISim simulation verification results find out the binary estimation signal sequence could be recovered. All these prove this QAM communication system is noise- resistant.
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