MULTI-LENGTH CYCLIC PREFIX FOR OFDM TRANSMISSION IN PLC CHANNELS

摘要

Embodiments of the invention provide multiple cyclic prefix lengths for either both the data-payload and frame control header or only the data payload. Frame control header (FCH) and data symbols have an associated cyclic prefix. A table is transmitted in the FCH symbols, which includes a cyclic prefix field to identify the cyclic prefix length used in the data payload. A receiver may know the cyclic prefix length used in the FCH symbols in one embodiment. In other embodiments, the receiver does not know the FCH cyclic prefix length and, therefore, attempts to decode the FCH symbols using different possible cyclic prefix lengths until the FCH symbols are successfully decoded.

主权项

1. A method comprising:
performing, by a receiver in a power line communication (PLC) device, receiving packets comprising frame control header (FCH) symbols and data symbols; decoding the FCH symbols; extracting an FCH table from the decoded FCH symbols; determining a length of a cyclic prefix for data symbols from the FCH table; and decoding the data symbols using the cyclic prefix length from the FCH table.