Publication: Development and implementation of various qam generated signals schemes using fpga for baseband digital data transmission
Date
2024-07
Authors
liuyuxing
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Abstract
This project explores the development and implementation of various Quadrature Amplitude Modulation (QAM) signal schemes using Field-Programmable Gate Arrays (FPGA) for baseband digital data transmission. QAM modulation and demodulation is a complex signal analysis method, so the construction of QAM modulator and demodulator hardware is one of the difficulties of this project, and how to maintain signal stability and reduce bit error rate during signal transmission is also the top priority of this project. The difficulty of QAM implementation on FPGA lies in the complexity of signal. The goal of this paper is to realize QAM modulation and demodulation with Verilog language and measure the actual waveform The focus is on utilizing 16-QAM modulation to achieve efficient digital communication. The integration of MATLAB/Simulink for simulation and Verilog for hardware implementation was pivotal in this study. The project began with the creation of a mathematical model for the QAM modulator using MATLAB/Simulink, followed by the development and verification of Verilog code for the sub-circuits of the QAM modulator and demodulator. Experimental validation was conducted using an FPGA development board, and the results confirmed the feasibility and effectiveness of the 16-QAM modulation and demodulation on FPGA. This project has successfully verified the practicability and high efficiency of 16-QAM modulation and demodulation using FPGA technology. The simulation results of Modelsim software show that there is only a 4ns delay between the input signal and the output signal, and the output of the modulated signal is a 14-bit digital signal. The DAC converts the digital signal into an analog signal with a voltage range of -5V to +5V.