US 12,335,362 B1
Systems and methods for data frame and data symbol synchronization in a communication network
Junwen Zhang, Broomfield, CO (US); Mu Xu, Broomfield, CO (US); Haipeng Zhang, Broomfield, CO (US); Zhensheng Jia, Superior, CO (US); and Luis Alberto Campos, Superior, CO (US)
Assigned to Cable Television Laboratories, Inc., Louisville, CO (US)
Filed by Cable Television Laboratories, Inc., Louisville, CO (US)
Filed on Jun. 12, 2023, as Appl. No. 18/333,305.
Application 18/333,305 is a continuation of application No. 17/161,169, filed on Jan. 28, 2021, granted, now 11,677,540.
Claims priority of provisional application 62/966,660, filed on Jan. 28, 2020.
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 7/04 (2006.01); H04B 3/54 (2006.01); H04J 3/06 (2006.01); H04L 7/00 (2006.01); H04L 27/36 (2006.01)
CPC H04L 7/042 (2013.01) [H04B 3/542 (2013.01); H04J 3/0638 (2013.01); H04L 7/0075 (2013.01); H04L 27/365 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for synchronizing a data frame and data symbols in a communication system, comprising:
detecting a presence of a sequence including a sequence of data symbols that are conjugate symmetric, in a stream of a plurality of received data symbols, the sequence including a first set of data symbols and a second set of data symbols, each data symbol of the second set of data symbols being a complex conjugate of a respective data symbol of the first set of data symbols; and
identifying a position of a data frame from the presence of the sequence,
wherein:
detecting the presence of the sequence includes determining an autocorrelation value between (a) a first sliding window sample of the plurality of received data symbols and (b) and a second sliding window sample of the plurality of received data symbols,
the first sliding window sample has a length equal to a length of the first set of data symbols, and
the second sliding window sample has a length equal to a length of the second set of data symbols.