Apparatus and method using smart antenna in FDD wireless...

Details Apparatus and method using smart antenna in FDD wireless... Apparatus and method using smart antenna in FDD wireless...

2002-12-12

2008-07-01

Duong, Frank (Department: 2616)

Multiplex communications

Communication over free space

Combining or distributing information via frequency channels

C370S334000

Reexamination Certificate

active

07394799

ABSTRACT:
The invention relates to a method and an apparatus using smart antennas in a frequency division duplex code division multiple access mobile communication system and for solving the limitations of smart antenna use due to asymmetric propagation of uplink electric wave and downlink electric wave. In the wireless base station, there are transmitting and receiving smart antenna arrays 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.

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Kuchar et al, A Robust DOA-based Smart Antenna Processor for GSM Base Stations, IEEE, pp. 1-6, 1999.
International Search Report corresponding to International Application No. PCT/CN01/00133 dated Apr. 5, 2001.

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