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Title
Optical OFDMA communication network and method for operating an optical OFDMA communication network
Date Issued
2014
Author(s)
Razmtouz, Ali
Patent No
EP74085
Abstract
The invention relates to an optical OFDMA communication network, comprising: - - a plurality of optical network units (ONUs 2a-2n), wherein each one of the ONUs (2a-2n) is configured to generate a ranging sequence (20b - 20n) for upstream synchronization of the ONUs (2a-2n); - - a receiving unit (5) for receiving signals of the ONUs (2a-2n), the receiving unit (5) being also configured to receive the ranging sequences (20b - 20n) of the ONUs (2a-2n), - - wherein the receiving unit (5) comprises a correlator unit (61) in which a plurality of ranging sequences (611) is stored, - - and wherein the receiving unit (5) is configured to perform a ranging detection operation including performing a correlation operation with a plurality of the received ranging sequences (20b - 20n) using at least one of the stored ranging sequences (611) and to transmit a ranging response to the ONUs (2a-2n); depending on the result of the correlation operation. The ranging sequence consists in a four time repeated CAZAC sequence, multiplied by a ONU specific PN sequence and by a frequency shift.
Language
en
Patenprio
WO EP74085 : 20121130