Signal processing apparatus employing the spectral property...

H - Electricity – 04 – B

Patent

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H04B 1/12 (2006.01) H03H 21/00 (2006.01) H04L 1/06 (2006.01) H04L 25/03 (2006.01) H04L 27/22 (2006.01)

Patent

CA 2268272

A method and apparatus for separating and removing distortion from interfering co-channel singals and suppressing adjacent-channel interfering signals of the Gaussian Minimum-Shift Keyed (GMSK) or other MSK type with filtering structures that exploit the cyclostationarity of the received GMSK or other MSK signals in order to accommodate a greater number (or the same number, but with greater quality) of transmitted signals received by one or more antennas than can be accommodated by existing filters. The parameters in these filtering structures are adapted by either of two adaptation apparatus that exploit both the known training sequence that is transmitted in most wireless communications systems, and the constant modulus property exhibited by each of the transmitted GMSK or other MSK signals.

L'invention concerne un procédé et un appareil destinés à séparer des signaux d'un même canal qui interfèrent, à empêcher leurs distorsions et à supprimer les interférences avec les signaux de canaux adjacents à modulation gaussienne à déphasage minimal (GMSK) ou à modulation à déphasage minimal (MSK), avec des structures de filtration qui exploitent le caractère cyclostationnaire des signaux GMSK ou autres signaux MSK reçus, pour recevoir un nombre plus important (ou le même nombre, mais d'une meilleure qualité) de signaux transmis par une antenne ou par plusieurs antennes, ce que ne peuvent faire les filtres existants. Les paramètres de ces structures filtrantes sont adaptés par l'un ou l'autre des deux appareils d'adaptation qui exploitent des séquences d'apprentissage connues transmises dans la plupart des systèmes de communication radio et la propriété de module constant présentée par chacun des signaux GMSK ou MSK transmis.

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