Carrier Synchronization Using Squaring Loop Implementation

This program achieves carrier synchronization using a squaring loop while utilizing a phase-locked loop (PLL) for phase offset tracking control. The squaring loop is a widely-used synchronization technique that operates by multiplying the input signal with a local carrier signal to extract carrier information. The implementation typically involves squaring the modulated signal to generate a harmonic component at twice the carrier frequency, which is then filtered and divided by two to recover the original carrier. The phase-locked loop serves as a controller for tracking phase deviations, continuously adjusting the phase of the local carrier signal based on detected phase differences from the input signal. The PLL implementation typically consists of three core components: a phase detector that calculates phase error, a loop filter that removes high-frequency noise, and a voltage-controlled oscillator (VCO) that generates the corrected carrier waveform. By combining the advantages of both squaring loop and PLL technologies, this program architecture effectively achieves robust carrier synchronization and dynamic phase offset tracking. The code implementation likely includes numerical methods for signal multiplication, digital filtering algorithms for noise reduction, and feedback control mechanisms for real-time phase adjustment.