France Telecom

Charlotte Langlais

Maryline Helard

Christophe Laot

Yves-Marie Morgan

A method for synchronizing symbols at the output of a blind equalizer, the method being characterized by the following steps: on sending, inserting into a succession of sent symbols, one or more known sequences of symbols repeated in said succession of symbols; detecting said one or more known sequences at the output of said blind equalizer; deducing any shifting of the symbols at the output of the blind equalizer from the result of said detection; and retiming the symbols at the output of the blind equalizer as a function of the deduced shift.

Method for synchronizing an equalizer output data

The invention relates to a device for cancelling inter-symbol interference in a sampled digital signal. The device comprises a first filter, for which the optimum transfer function is identical to that of the transmission channel, and which receives a sequence of samples ({{tilde over (d)}}) representative of the digital signal sent to the input of the transmission channel, a subtractor circuit to subtract the first filter output ({{tilde over (d)}'}) from the sequence of input samples ({r}), a second filter tuned to the transmission channel, with an optimum transfer function H*(f), to which the output ({e}) from the subtractor circuit is input, and an adder circuit designed to add the output from the second filter to the sequence of samples ({{tilde over (d)}}) representative of the digital signal sent to the input of the transmission channel, and thus generating a sequence of complex symbols ({}) without any inter-symbol interference.

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Rennes, France

Charlotte Langlais