Frequency-Domain Frame Synchronization In Multi-Carrier Systems

摘要

Methods and systems are disclosed for frequency-domain frame synchronization for multi-carrier communication systems. Received signals are sampled and converted into frequency domain components associated with subcarriers within the multi-carrier communication signals. A sliding-window correlation (e.g., two-dimensional sliding window) is applied to the received symbols represented in the frequency domain to detect frame boundaries for multi-carrier signals. The sliding-window frame synchronization can be applied by itself or can be applied in combination with one or more additional frame synchronization stages. The disclosed embodiments are particularly useful for frame synchronization of multi-carrier signals in PLC (power line communication) systems.

主权项

1. A method for detecting a frame boundary in multi-carrier signals, comprising:
receiving input signals from a communication medium; digitizing the input signals to generate digital samples; generating frequency components for the digital samples, the frequency components being associated with received symbols within the input signals; determining a frame synchronization correlation value based upon a multiplication of frequency components for a subset window of the received symbols with predetermined frequency components for reference symbols; providing additional frame synchronization correlation values for additional subset windows by shifting the frequency components for the received symbols by one symbol and repeating the generating and determining steps for each subset window; analyzing the plurality of frame synchronization correlation values to determine a frame boundary; and outputting a frame synchronization detection signal indicating the frame boundary.