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1. AU2000243410 - Method and apparatus employing delay combining for receive diversity in a wireless system repeater

Office Australie
Numéro de la demande 2000243410
Date de la demande 11.04.2000
Numéro de publication 2000243410
Date de publication 20.07.2000
Type de publication A
CIB
H04B 7/08
HÉLECTRICITÉ
04TECHNIQUE DE LA COMMUNICATION ÉLECTRIQUE
BTRANSMISSION
7Systèmes de transmission radio, c. à d. utilisant un champ de rayonnement
02Systèmes de diversité; Systèmes à plusieurs antennes, c. à d. émission ou réception utilisant plusieurs antennes
04utilisant plusieurs antennes indépendantes espacées
08à la station de réception
H04B 7/26
HÉLECTRICITÉ
04TECHNIQUE DE LA COMMUNICATION ÉLECTRIQUE
BTRANSMISSION
7Systèmes de transmission radio, c. à d. utilisant un champ de rayonnement
24pour communication entre plusieurs postes
26dont au moins un est mobile
H04B 7/155
HÉLECTRICITÉ
04TECHNIQUE DE LA COMMUNICATION ÉLECTRIQUE
BTRANSMISSION
7Systèmes de transmission radio, c. à d. utilisant un champ de rayonnement
14Systèmes relais
15Systèmes relais actifs
155Stations terrestres
Déposants Airnet Communications Corporation
Inventeurs Komara, Michael
Noll, John R.
Schmutz, Thomas
Titre
(EN) Method and apparatus employing delay combining for receive diversity in a wireless system repeater
Abrégé
(EN)
An approach to extending TDMA system coverage is disclosed wherein in-band translator components are located in the center of remote cells which would normally contain a base transceiver system (BTS). The in-band translators employ delay combining to preserve receive diversity, in order to mitigate deep Rayleigh fades. Delay combining produces the diversity effect by introducing a small time delay between the two spatially separate receive paths which serves to maximize the quality of received signals. The same carrier signal is received by two uplink antennas located at least 8 wavelengths apart (over 4 feet apart at 1900 MHz). Both receive paths are broadly filtered (over the entire licensed RF receive band), low-noise amplified, downconverted to an IF, and narrowband filtered to a single carrier. One path is then delayed by up to 16 $g(m)sec and then combines with the other path. The composite is then sent through a fast automatic level control (ALC) and brought to a constant level. This signal is then upconverted to the desired uplink backhaul RF frequency and transmitted at high power to the serving BTS via a directional antenna. Adaptive delay equalization processing in the BTS removes the delay spread so that the combined signals can be separated and demodulated as one signal. The combined signal has similar signal-to-noise performance as a switching diversity method without requiring switching hardware or slot-by-slot timing.

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