This project implements a digital communication system component designed to resolve phase ambiguity in Quadrature Phase Shift Keying (QPSK) signals. Phase ambiguity is a common issue in QPSK systems where a receiver's carrier recovery loop may lock onto one of four possible phase states, leading to incorrect symbol interpretation.
Phase ambiguity in QPSK arises because the carrier can lock with 0°, 90°, 180°, or 270° rotation, causing bit errors. Differential decoding solves this by encoding data in the phase difference between consecutive symbols, so correct detection is possible regardless of absolute constellation rotation.
Wrapped Gaussian Mixture Model for angular clustering
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