MATLAB Implementation of BPSK Modulation and Demodulation with Extended Digital Modulation Schemes

Modulation and demodulation programs for BPSK, QPSK, 8QAM, 16QAM, and 32QAM digital communication schemes. These modulation techniques are widely used in digital communications to convert digital signals into analog waveforms for transmission. The implementation includes BPSK (Binary Phase Shift Keying) using two distinct phases for modulation, QPSK (Quadrature Phase Shift Keying) utilizing four phase states, 8QAM employing eight combinations of phase and two amplitude levels, 16QAM using sixteen constellation points with four amplitude levels, and 32QAM incorporating thirty-two points with eight amplitude variations. From a code implementation perspective, each modulation scheme is structured as independent MATLAB modules featuring: - Constellation mapping functions that convert binary data to complex symbols - Pulse shaping filters (such as raised cosine filters) for bandwidth control - Carrier modulation using complex exponential functions These modular implementations can be seamlessly integrated into any channel environment as standalone components. The demodulation subsystem implements two distinct approaches: 1. Coherent detection using matched filtering and maximum likelihood decision criteria 2. Non-coherent detection employing differential decoding for phase ambiguity resolution Key MATLAB functions include: ###pskmod### for phase modulation implementations ###qammod### for quadrature amplitude modulation ###awgn### channel function for noise addition ###pskdemod### and ###qamdemod### for symbol decision making The appropriate demodulation method can be selected based on specific application requirements and channel conditions. These comprehensive modulation/demodulation implementations provide diverse and flexible solutions for digital communications, accommodating various transmission environments and performance requirements through parameterized constellation design and adaptive detection algorithms.