Carrier Recovery for DVB Demodulation Systems

This paper presents a carrier recovery algorithm designed for DVB demodulation systems, integrating three distinct techniques: FD (Frequency Domain), PFD (Phase-Frequency Detection), and DD (Decision-Directed). The FD technique operates through frequency domain analysis, detecting carrier frequency and phase offsets using FFT-based spectral analysis or autocorrelation methods in code implementation, followed by corresponding compensation. The PFD technique enables simultaneous detection and compensation of signal phase and frequency deviations, typically implemented via phase-locked loop (PLL) structures with proportional-integral controllers for more precise carrier recovery. The DD technique leverages known data patterns (e.g., preamble symbols or pilot sequences) through LMS adaptive filtering or Kalman filtering approaches to achieve enhanced carrier estimation and recovery. This hybrid algorithm significantly improves DVB demodulation system performance by combining coarse frequency acquisition (FD), fine tracking (PFD), and data-aided refinement (DD), demonstrating practical applicability and scalability for real-world implementations.