Patent ID: 9692484
Date: 2017-06-27
CPC Classifications: H04B,H04L

Claim:
1. A method of operating a power line communication (PLC) system, comprising: forming a data frame in the (PLC) system having plural orthogonal frequency division multiplex (OFDM) symbols; allocating a first set of preamble subcarriers to at least one of the OFDM symbols; and allocating selectively one of a second set of preamble subcarriers and a third set of data subcarriers to said at least one of the OFDM symbols in response to a signal quality; including K preamble subcarriers in the first and second sets in said at least one of the OFDM symbols in response to a control signal indicating the signal quality, when the signal quality is poor, where K is a positive integer; and including K/