Process of synchronization in the time and frequency domain of multiple equipments in a transmission system with OFDM modulation
AssigneeMarvell Hispania, S. L. U.
InventorsJorge Blasco Claret, Juan Riveiro Insua, Salvador Iranzo Molinero
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Abstract
Allows synchronisation of multiple users by means of improving the estimation of the start of the OFDM symbols and improving the estimate of frequency error in noisy environments or in frequency selective channels. It is characterized by the decomposition of the received signals x(n9, that contain data and synchronization sequences, in frequency bands (M) and the application of synchronisation algorithms in one of said bands.
Claims14
A PROCESS OF SYNCHRONIZATION IN THE TIME AND FREQUENCY DOMAIN OF MULTIPLE EQUIPMENTS IN A TRANSMISSION SYSTEM WITH OFDM MODULATION, applicable to two-way communication over the electricity network between different equipments 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 equipments, 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 equipment and all the other equipments, wherein 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;
- combining the estimations obtained in each frequency band.
Dependencies are inferred from the claim text.