Diversity transmission

Details Diversity transmission Diversity transmission

2006-12-12

2006-12-12

Orgad, Edan (Department: 2618)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S101000, C455S434000, C455S442000, C455S561000, C370S320000, C370S342000

Reexamination Certificate

active

07149547

ABSTRACT:
The invention relates to a method and a system for implementing diversity in transmission utilizing orthogonal antenna beams formed using digital beam forming methods. In this method antenna beams are directed to be adjacent so as to set at least one of the estimated directions of arrival of the received signal within the range between antenna amplification maximums of the antenna beams and signal is sent using said antenna beams. An advantage provided by the method and system of the invention is to improve the performance of the system in the downlink direction and also to reduce the imbalance between the uplink performance and the downlink performance. The method of the Invention also allows to carry out power control specifically for each antenna beam.

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patent: 847 978 (1995-04-01), None
patent: WO 98/36596 (1998-08-01), None
Ylitalo et al., “An Adaptive Antenna Method for Improving Downlink Performance of CDMA Base Stations,” IEEE 5thInternational Symposium on Spread Spectrum Techniques and Applications, 1998 Proceedings, vol. 2, pp. 599-603.
Katz et al., “Beamspace-Time Coding Method for Downlink Performance Enhancement of CDMA Micro/Pico-Cell Base Stations,” Proceedings 1999 Finnish Signal Processing Symposium (FINSIG '99), May 31, 1999, University of Oulu, Oulu, Finland, pp. 25-29.

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