Explore MATLAB source code curated for "星座图" with clean implementations, documentation, and examples.
This MATLAB program simulates constellation diagrams for QPSK and 16QAM modulated signals passing through additive white Gaussian noise (AWGN) and Rayleigh fading channels, implementing comprehensive communication system modeling with configurable parameters and performance analysis capabilities.
This MATLAB code generates a 16QAM signal, passes it through an AWGN channel, applies constant modulus algorithm (CMA) blind equalization, and outputs constellation diagrams and convergence plots with detailed implementation insights.
Partial implementation code for QPSK constellation diagram, discovered through research and found to be well-structured. This serves as a valuable reference for understanding digital modulation techniques and signal processing implementation.
Comprehensive simulation of 16QAM system modulation and demodulation, including constellation diagram visualization, modulated/demodulated signal waveforms, output power spectrum analysis, eye diagram generation, and bit error rate performance evaluation.
This simulation demonstrates OFDM peak-to-average power ratio reduction using predistortion technique, comparing constellation diagrams with and without predistortion. The implementation uses QAM mapping and shows significant performance improvement. The code includes signal generation, predistortion algorithm application, and constellation visualization.
16QAM mapping implementation in digital communication with Gray encoding, including constellation diagram visualization. This clear demonstration provides foundation for extending to 64QAM and 128QAM implementations in MATLAB.
Comprehensive demonstration of 16QAM modulation and demodulation processes, featuring eye diagram observation, constellation diagram analysis, bit error rate calculation, and system performance evaluation for practical 16QAM communication system applications
Comprehensive Simulink simulation of BPSK modulation with complete parameter configurations, spectral analysis diagrams, and constellation plots
Comprehensive OFDM simulation including step-by-step waveform analysis, constellation diagrams, spectrum characteristics, and corresponding MATLAB implementation approaches
Using MATLAB simulation software, this project implements a fundamental 16QAM digital communication system as shown in Figure 1. The system generates equally distributed random binary signals (0s and 1s), maps them to 16QAM constellation points, and separates the signal into in-phase (real) and quadrature (imaginary) components. Both components undergo root-raised-cosine (RRC) filtering, experience additive white Gaussian noise (AWGN) channel impairment, and pass through matched RRC filters. The final stage involves sampling, decision-making, and comparison with original signals to calculate the bit error rate (BER) for the 16QAM digital system.