The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 2007
Filed:
Oct. 23, 2002
Christophe Laot, Plougonvelin, FR;
Charlotte Langlais, Locmaria Plouzane, FR;
Maryline Helard, Rennes, FR;
Christophe Laot, Plougonvelin, FR;
Charlotte Langlais, Locmaria Plouzane, FR;
Maryline Helard, Rennes, FR;
France Telecom, Paris, FR;
Abstract
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.