QPSK Modulation and Demodulation under Additive White Gaussian Noise Channel Conditions

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Resource Overview

Implementation of QPSK signal modulation and demodulation under AWGN channel conditions, featuring analysis of modulated signal power spectrum diagrams, input-output signal comparisons, and time-varying bit error rate plots contrasted with theoretical BER performance

Detailed Documentation

Under Additive White Gaussian Noise (AWGN) channel conditions, we implemented and analyzed QPSK signal modulation and demodulation. The implementation typically involves generating QPSK symbols through phase shifting (0°, 90°, 180°, 270°) and employing coherent detection at the receiver. We examined the power spectral density of the modulated signal using FFT-based spectral analysis, compared input and output signal constellations through scatter plot visualization, and analyzed time-dependent bit error rate performance using moving average calculations. These results were systematically compared against theoretical BER curves derived from Q-function approximations for AWGN channels. Through these analytical observations, we gained deeper insights into signal transmission performance under specified channel conditions, particularly regarding phase synchronization requirements and noise tolerance thresholds in practical QPSK system implementations.

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