Abstract: The present invention relates to a receiver for a high speed transmission system and a method for receiving a signal on a receiving side of a transmission system wherein a first signal is transmitted over a transmission path. Said first signal comprises a plurality of data symbols which are successively transmitted, in front of each being a first prefix for avoiding an interference between said successively transmitted data symbols. The receiver according to the present invention comprises a filter having a pass characteristic such that said first signal can pass, a buffer for buffering said first signal, means for generating a second prefix for each first prefix in front of each of said plurality of data symbols replacing means for replacing said first prefix by said second prefix, said second prefix respectively having a length longer than that of said first prefix to be replaced. The invention finds application in DMT XDSL systems.

Abstract: The present invention relates to a receiver for a high speed transmission system and a method for receiving a signal on a receiving side of a transmission system wherein a first signal is transmitted over a transmission path. Said first signal comprises a plurality of data symbols which are successively transmitted, in front of each being a first prefix for avoiding an interference between said successively transmitted data symbols. The receiver according to the present invention comprises a filter having a pass characteristic such that said first signal can pass, a buffer for buffering said first signal, means for generating a second prefix for each first prefix in front of each of said plurality of data symbols replacing means for replacing said first prefix by said second prefix, said second prefix respectively having a length longer than that of said first prefix to be replaced. The invention finds application in DMT XDSL systems.

Abstract: In a multicarrier QAM system, a receiver comprises a data directed phase error estimator which determines a phase rotation direction of each received complex QAM data value (Yk) with respect to the complex default QAM data value C(k) used by a quantizer/decoder for decoding. The data directed phase error estimator averages the phase rotation directions for all carriers and adjusts the phase of a sample frequency (fsampR) output by a numerically-controlled oscillator on the basis of this overall average phase rotation direction value (D). Thus, an overall estimate of the missing phase synchronization to the sample frequency used in the transmitter can be obtained such that the data symbols can be more accurately decoded.

Abstract: The present invention concerns a method and a device for the synchronization of a transmitter (1) and at least one receiver (3) in multi-carrier modulated communication systems in which FFT technology is used for the modulation and demodulation of data transmitted between the transmitter (1) and the receiver (3). According to the invention the transmitter (1) transmits synchronization symbols (15, 16) as training symbols (15, 16) at the beginning of a transmission, until a result is obtained that may indicate where a synchronization symbol starts. The result is used for the adjustment of the symbol rate in the receiver (3). Data symbols may then be transmitted after the synchronization symbols (15, 16).