Research on QPSK Open-Loop Carrier Synchronization Technology: Frequency Offset Estimation Algorithms

The research on QPSK open-loop carrier synchronization technology and frequency offset estimation algorithms represents a significant R&D effort focused on exploring and improving open-loop carrier synchronization techniques in QPSK communication systems. The primary technical objective involves accurately estimating signal frequency offsets to ensure reliable signal transmission and reception. This study examines various frequency offset estimation algorithms such as the FFT-based method, M&M algorithm, and maximum likelihood estimation, while evaluating their performance characteristics and implementation suitability. Through experimental analysis of these algorithms using MATLAB or Python implementations, including key functions like signal correlation calculation, phase extraction, and error detection mechanisms, we aim to develop more efficient and accurate frequency offset estimation methods. The research contributes to performance enhancement of QPSK communication systems by optimizing algorithm parameters and implementing robust error correction techniques in the synchronization process.