US 2002/0001355 A1Published application

Receiver and method for avoiding intersymbol interference in a high speed transmission system

AssigneeTelefonaktiebolaget LM Ericsson

InventorAndre Tore

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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.

Claims11

Dependent claims

A receiver for a high speed transmission system for receiving a first signal (B) over a transmission path (30), said first signal (B) comprising a plurality of data symbols (50a, 51a, 52a) which are successively transmitted, in front of each being a first prefix (50b, 51b, 52b) for avoiding an interference between said successively transmitted data symbols (50a, 51a, 52a), said receiver comprising:

means (33) for generating a second prefix (53, 55) for each first prefix (50b, 51b, 52b) in front of each of said plurality of data symbols (50a, 51a, 52a);
and
replacing means (34) for replacing said first prefix (50b, 51b, 52b) by said second prefix (53, 55), said second prefix (53, 55) respectively having a length longer than that of said first prefix (50b, 51b, 52b) to be replaced,
characterized by
a buffer (32) for buffering said first signal;
a filter (35) having a pass characteristic such that said first signal can pass comprising a first filter portion (60) having a finite impulse response introducing zeros in the transfer function of said filter (35) and a second filter portion (61) having an infinite impulse response introducing poles in the transfer function of said filter (35).
wherein said first filter portion (60) is arranged in front of said replacing means (34) with respect to said transmission path (30), and said second filter portion (61) behind thereof.

4 more elements

A method for receiving a signal (B) on a receiving side of a transmission system, said signal comprising data symbols (50a, 51a, 52a) and a first prefix (50b, 51b, 52b) in front of each data symbol (50a, 51a, 52a) for avoiding an interference of successively transmitted data symbols (50a, 51a, 52a), comprising the following steps:

receiving said signal on the receiving side (S1);
buffering said received signal (S2);
generating a second prefix for each first prefix in front of each of said data symbols (S3);
replacing said first prefix by said second prefix, said second prefix having a length longer than that of said first prefix to be replaced (S4);
filtering said signal, wherein said first prefix has been replaced by said second prefix, by means of a filter having a pass characteristic such that said signal can pass (S5), including firstly filtering said signal with a first filter portion (60) having a finite impulse response (FIR) introducing zeros in the transfer function of said filter (35) before replacing said first prefix (51b, 51b, 52b) and secondly filtering said signal (B) wherein said first prefixes (50b, 51b, 52b) have been replaced by said second prefixes (50a, 51a, 52a) by means of a second filter portion (61) having an infinite impulse response (IIR) introducing poles in the transfer function of said filter (35).

2 more elements

Dependencies are inferred from the claim text.