MATLAB Source Code Example for 4PSK Modulation

This MATLAB source code example demonstrates 4-PSK (Quadrature Phase Shift Keying), a fundamental digital modulation technique used in communication systems. The implementation shows how to convert digital signals into analog waveforms suitable for transmission over communication channels. 4-PSK, also known as QPSK, utilizes four distinct phase shifts (typically 0°, 90°, 180°, and 270°) to represent two-bit digital symbols (00, 01, 10, 11). The MATLAB code includes key functions for symbol mapping, carrier modulation, and constellation diagram generation. The implementation typically involves creating a phase-shift keying modulator using trigonometric functions, where each symbol period contains a cosine wave with one of four specific phase offsets. This modulation scheme is widely employed in various applications including wireless communications, satellite systems, and digital broadcasting. Through this practical MATLAB example, engineers can better understand the underlying principles and practical implementation aspects of 4-PSK modulation, including symbol-to-phase mapping algorithms, baseband signal generation, and carrier modulation techniques.