Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Reexamination Certificate
2003-04-10
2004-05-18
Blum, Theodore M. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
Reexamination Certificate
active
06738019
ABSTRACT:
FIELD OF THE INVENTION
This invention relates in general to radio frequency (RF) communication systems, and more specifically to an apparatus and method for driving a sectored, preferably beamed antenna system.
BACKGROUND OF THE INVENTION
It is known that Fourier Transform Matrix (FTM) devices can be used in a multi-carrier RF communication system, specifically transmitters therein, for amplifying a plurality of RF signals or carriers. Certain advantages can be associated with the use of FTM devices. These include one or more of a reduced peak-to-average power requirement for individual amplifiers used in conjunction with the FTM devices and an attendant improvement in efficiency of these amplifiers. In addition a degree of amplifier redundancy can be available when FTM devices are used in order to share amplifiers among multiple carriers. Furthermore the efficiency of amplifier utilization in the sense of percentage of amplifiers being used of those available can be improved with this sharing.
Unfortunately, if signals or carriers that are to be processed through any one of the FTM devices are correlated or correlated to a large extent some of these advantages, such as improvements in the peak to average ratio can not be realized. Also uneven loading of amplifiers associated with different FTM device can be a problem, particularly in sectored antenna arrangements.
REFERENCES:
patent: 5784031 (1998-07-01), Weiss et al.
patent: 5854611 (1998-12-01), Gans et al.
patent: 5987037 (1999-11-01), Gans
patent: 6243038 (2001-06-01), Butler et al.
patent: 6304214 (2001-10-01), Aiken et al.
Chen Jiangnan (Jason)
Luz Yuda
Rotstein Ron
Bethards Charles W.
Blum Theodore M.
Motorola Inc.
Posz & Bethards, PLC
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