Variable bandwidth filter for narrowband noise reduction and...

H - Electricity – 04 – B

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

H04B 1/10 (2006.01) H03H 7/12 (2006.01) H03H 17/02 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2587650

A technique for noise reduction in a wireless communication system uses controllable bandwidth filters (120) to filter a received signal. In a typical implementation, the filters (120) are used at baseband frequencies. A measurement (RSSI) is indicative of the strength of the received signal. A control circuit (144) generates a control signal (146) to control the bandwidth of the filters (120). If the received signal strength is above a first threshold, a wider bandwidth may be used for the filters (120). If the received signal is below a second threshold, the control circuit (144) generates the control signal (146) to set the filters (120) to a more narrow bandwidth. The bandwidth of the filter is also varied depending on the presence of a narrowband interferer (jammer). An adjustable delay unit ensures a constant group delay between all possible configurations of the filter.

L'invention concerne une technique de réduction de bruit dans un système de communications sans fil faisant appel à des filtres à largeur de bande variable (120) qui permettent de filtrer un signal reçu. En configuration type, les filtres (120) sont utilisés à des fréquences en bande de base. Une mesure (indication d'intensité de signal reçu, RSSI) donne l'intensité du signal reçu. Un circuit de contrôle (144) produit un signal de contrôle (146) de la largeur de bande des filtres (120). Si l'intensité du signal reçu excède un premier seuil, on peut utiliser une largeur de bande supérieure pour les filtres 120). Si cette intensité est inférieure à un second seuil, ledit circuit (144) produit un signal de contrôle (146) réglant les filtres (120) à une largeur de bande plus étroite. La largeur de bande des filtres varie aussi en fonction de la présence d'un brouilleur en bande étroite. Une unité de retard réglable assure un retard de gourpe constant entre toutes les configurations possibles du filtre.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Variable bandwidth filter for narrowband noise reduction 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 Variable bandwidth filter for narrowband noise reduction and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable bandwidth filter for narrowband noise reduction and... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1353225

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.