Process of synchronization in the time and frequency domain of multiple modems in a transmission system with OFDM modulation

• Main Authors: IRANZO MOLINERO, SALVADOR, BLASCO CLARET, JORGE VICENTE, RIVEIRO INSUA, JUAN CARLOS
• Format: Patent
• Language: Chinese; English
• Published: 16.01.2005
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

Applicable to two-way communication over the electricity network between different modems connected to the same electricity network so as to provide an estimation of the start of the OFDM symbols in reception and the frequency error of the local oscillators in the modems, including the generation of synchronisation sequences that are transmitted over the electricity network and the sending of these synchronisation sequences over the same channel used for the sending of data, where said channel is determined by a connection between one modem and all the other modems, characterized because it comprises: breaking down the received signals that contain the data and synchronisation sequences in various frequency bands or ranges; detecting the synchronisation sequences in each frequency range or band in reception by means of applying a synchronisation algorithm in time to estimate in each frequency band, the start of the OFDM symbols and the frequency error of the local oscillators on the basis of this algorithm; -