Patent ID: 8165234
Filing Date: 2012-04-24
Classification: H04L

Abstract:
1. A method for synchronizing orthogonal frequency division multiplexing (OFDM) transmission symbols, comprising: receiving, by a digital subscriber line access multiplexer (DSLAM) at a central office, a synchronization signal, wherein the synchronization signal is generated and sent by a synchronization signal generator at the central office, and the synchronization signal is transmitted from the synchronization signal generator to the DSLAM at the central office over a twisted pair inside the central office; adjusting, by the DSLAM at the central office, OFDM symbols sent by all lines of the DSLAM at the central office to be synchronous symbols according to the synchronization signal; receiving, by a far-end DSLAM, the synchronization signal generated by the synchronization signal generator; and synchronizing, by the far-end DSLAM, OFDM symbols sent by all lines of the far-end DSLAM according to the synchronization signal; wherein a time sequence of the synchronization signal is adjusted in the synchronization signal generator before sending to the far-end DSLAM, so that the far-end DSLAM and the DSLAM at the central office receive the synchronization signal synchronously.