H - Electricity – 04 – J
Patent
H - Electricity
04
J
H04J 1/05 (2006.01) H03D 7/16 (2006.01)
Patent
CA 2250820
The invention concerns an entirely digital device for filtering, decimation and transposition into baseband for extracting and transposing in baseband one of the channels, called useful channel, of a channel frequency division multiplex and for reducing the oversampling factor of said useful channel, each channel being associated with a different carrier. This device comprises at least two rippling stages (40¿1? to 40¿L?), each stage comprising filtering means (42) and decimation means (43), said filtering means being located upstream of said decimation means for cleaning part of the spectrum in the places where the decimation means produce spectrum aliasing. The invention is characterised in that each stage (40¿1? to 40¿L?) further comprises transposing means, located upstream of said filtering means (42) and associated with a transposition frequency (f¿t,i?), previously selected among a set of N possible different frequencies, so as to transpose nearest to the zero frequency of the carrier (p¿0?) associated with said useful channel.
L'invention concerne un dispositif de filtrage, décimation et transposition en bande de base, du type entièrement numérique, permettant d'une part d'extraire et de transposer en bande de base l'un des canaux, dit canal d'intérêt, d'un multiplex fréquentiel de canaux, et d'autre part de réduire le facteur de suréchantillonnage dudit canal d'intérêt, chaque canal étant associé à une porteuse distincte. Ce dispositif comprend au moins deux étages en cascade (401 à 40L), chaque étage comprenant des moyens (42) de filtrage et des moyens (43) de décimation, lesdits moyens de filtrage étant placés en amont desdits moyens de décimation et permettant d'épurer une partie du spectre aux endroits où les moyens de décimation produisent des repliements de spectre. Selon l'invention, chaque étage (40l à 40L) comprend en outre des moyens (41) de transposition, placés en amont desdits moyens (42) de filtrage et associés à une fréquence de transposition (ft,i), choisie préalablement parmi un jeu de N fréquences de transposition distinctes possibles, de façon à transposer au plus près de la fréquence nulle la porteuse (p0) associée audit canal d'intérêt.
Bertrand Cyril
Sehier Philippe
Alcatel
Robic
LandOfFree
Digital device and method for filtering, decimation and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital device and method for filtering, decimation and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital device and method for filtering, decimation and... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1419437