H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/04 (2006.01) H04B 7/06 (2006.01) H04Q 7/22 (2006.01)
Patent
CA 2412018
The invention relates to a method and an apparatus using smart antenna in frequency division duplex code division multiple access mobile communication system, for solving limitation of smart antenna use due to asymmetric propagation of uplink electric wave and downlink electric wave. In the wireless base station, there are transmitting smart antenna array and receiving smart antenna array and associated transmitters and receivers, respectively, and a common baseband signal processor. In the method, the main path direction is determined by signal direction of arrival, obtained from receiving signal; in the downlink beam forming, an expected transmitting beam form is based on the main path direction. The system can obtain advantages of smart antenna, improve cell coverage, increase system capacity and reduce cost.
L'invention concerne un procédé et un appareil utilisant une antenne intelligente dans un système de communication sans fil en duplex à division de fréquence permettant de corriger la limitation de l'antenne intelligente causée par la propagation asymétrique des ondes en liaisons montante et descendante. La station de base sans fil comprend un réseau d'antennes intelligentes d'émission et de réception de fréquences, un émetteur-récepteur de radiofréquences correspondant et un processeur commun de signaux à bande de base. Le procédé de cette invention consiste à utiliser les signaux reçus afin de calculer l'orientation et d'assurer une orientation principale précise ; puis, à synthétiser une forme de faisceau d'émission prédéterminée par le biais de la mise en forme de faisceau en liaison descendante selon l'orientation principale. Ce système utilise pleinement les performances de l'antenne intelligente, améliore sa couverture, augmente sa capacité tout en réduisant les coûts de fabrication.
Li Feng
Li Jun
Li Shihe
China Academy Of Telecommunications Technology
Smart & Biggar
LandOfFree
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