Universal OFDM synchronizer for power line communication

摘要

A universal OFDM synchronizer for power line communication is provided. The universal OFDM synchronizer can be used for all known OFDM standards and allows maximum flexibility with best performance. The OFDM synchronizer comprises of a preamble averaging, a correlator and a peak discriminator. The OFDM synchronizer can be used with signals having 256 sample size preamble or 512 sample size preamble.

主权项

1. An OFDM synchronizer for a narrowband signal in a powerline communication compatible with a 256 samples preamble as well as a 512 samples preamble of an OFDM standards comprising:
a correlator configured to: generate a correlation metric for a preamble of the narrowband signal when the preamble is the 256 samples preamble, by multiplying and accumulating the preamble with a stored local reference corresponding to the 256 samples preamble; split the preamble of the narrowband signal when the preamble is the 512 samples preamble, into a first half of 256 samples preamble and a second half of 256 samples preamble and generating the correlation metric for the first half of 256 samples preamble and the second half of 256 samples preamble by multiplying and accumulating with the stored local reference corresponding to the first half of 256 samples preamble and the second half of 256 samples preamble; and a peak discriminator configured to discriminate a peak with a correlation score in the correlation metric, the peak discriminator adds a correlation score adjacent to the peak constructively using a sign bit multiplication scheme to the correlation score of the peak.