Implementation of Analog Modulation Using Quadrature Modulation Methods

This paper presents the implementation of analog modulation techniques using quadrature modulation methods. The implementation covers Amplitude Modulation (AM), Double Sideband Modulation (DSB), Single Sideband Modulation (SSB), Lower Sideband Modulation (LSB), Frequency Modulation (FM), and combined AM-FM modulation. The code implementation typically involves I/Q signal decomposition, Hilbert transforms for SSB generation, and frequency/phase integrators for FM modulation. Following implementation, the system displays both time-domain waveforms and power spectral density (PSD) plots, providing comprehensive insights into modulation signal characteristics and performance metrics. The PSD analysis employs Fast Fourier Transform (FFT) algorithms with proper windowing functions, while time-domain visualization uses plotting libraries to show carrier modulation, envelope variations, and sideband structures. Key functions in the implementation include: - I/Q modulator blocks for quadrature signal processing - Hilbert transform filters for phase shifting in SSB generation - Voltage-controlled oscillator (VCO) models for FM modulation - PSD estimation using Welch's method or periodogram techniques - Real-time waveform plotting with adjustable time axes and sampling rates