Constellation Diagram Demodulation Source Code for IEEE 802.11a Standard

This source code implements constellation diagram demodulation following the IEEE 802.11a standard, supporting multiple digital modulation schemes including BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), 16QAM (16-Quadrature Amplitude Modulation), and 64QAM (64-Quadrature Amplitude Modulation). These digital modulation techniques are fundamental in wireless communications for converting digital signals into analog waveforms for transmission. The implementation typically involves: - BPSK modulation using two phase states (0° and 180°) with simple decision boundary detection - QPSK modulation employing four phase quadrants with phase recovery algorithms - 16QAM demodulation utilizing 16 constellation points with amplitude and phase detection - 64QAM handling 64 complex constellation points requiring advanced signal processing Key algorithmic components include: - Symbol timing recovery for synchronization - Carrier frequency offset correction - Phase-locked loop (PLL) implementation - Maximum likelihood detection algorithms - Signal-to-noise ratio (SNR) estimation for adaptive demodulation These modulation schemes are extensively used in wireless networks to enhance data transmission rates and reliability through efficient spectral utilization and error correction mechanisms. The code structure typically includes modular components for each modulation type, shared signal processing routines, and performance validation modules.