Mobile station receiving method and mobile station receiver

H - Electricity – 04 – B

Patent

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Details

H04B 1/707 (2006.01) H04B 1/10 (2006.01) H04B 7/005 (2006.01) H04B 7/26 (2006.01) H04J 13/00 (2006.01) H04L 25/03 (2006.01)

Patent

CA 2346785

Degradation of the reception quality and reduction in the number of terminals accommodated are prevented even if signal components are received as an interference at different demodulating timings thereof by distortion of the transmission line. A mobile station receiving method is for a downstream line of a CDMA (Code Division Multiple Access) cellular system in which a base station spreads the spectrum of a transmission signal to be transmitted to mobile stations by means of mutually orthogonal spreading codes, and superposes and transmits the spread-spectrum transmission signals synchronously, and the mobile stations receive the transmitted signals subjected to transmission line distortion as a result that the transmitted signals have passed through radio transmission lines of different delay times. In the method, the signals transmitted and subjected to the distortion are equalized and demodulated by using a filter having characteristics opposite to those of the radio transmission lines.

La présente invention concerne une technique destinée à empêcher une dégradation de la qualité de réception et une diminution du nombre de terminaux couverts même si les composantes du signal sont reçues sous forme de brouillage à des intervalles de démodulation différents par suite d'une distorsion de la ligne de transmission. La méthode de réception pour station mobile s'applique à une ligne aval d'un système cellulaire AMRC (accès multiple par répartition de code) dans lequel une station de base étale le spectre d'un signal de transmission à transmettre à des stations mobiles au moyen de codes e répartition mutuellement orthogonaux, puis superpose et transmet de manière synchrone les signaux de transmission à spectre étalé. Les stations mobiles reçoivent les signaux transmis, soumis à une distorsion de ligne de transmission du fait que les signaux transmis ont parcouru les lignes de transmission radio avec des retards différents. Selon le procédé de l'invention, les signaux transmis exposés à distorsion sont égalisés et démodulés au moyen d'un filtre présentant des caractéristiques opposées à celles des lignes de transmission radio.

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