Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Reexamination Certificate
2006-06-13
2006-06-13
Gesesse, Tilahun (Department: 2684)
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
C455S562100, C455S277200, C455S452200
Reexamination Certificate
active
07062246
ABSTRACT:
An adaptive antenna array (14) includes a muliplicity of antenna elements (12a–12k, 48a–48k) responsive to uplink communications (16a–16k) and arranged to support directional-orientated downlink communication to subscriber units (18). The adaptive antenna array (14) is operationally responsive to a signal processor (28) that co-operates with direction of arrival estimation logic (36) to assess an angle of arrival of uplink communications incident to the array. To avoid inter-cell interference, especially during early stages of a call, the signal processor operates to ensure that a wide area downlink beam (108) is provided for a downlink path to an addressed subscriber unit. With time and/or with reported (68,84) downlink quality of service (QoS) metrics, the signal processor (28) regulates (74, 92, 96) a width of the downlink beam by altering the number of antenna elements used to support the downlink beam, thereby altering the downlink beam aperture. Generally, with time, more antenna elements (92) are used and so the beam is narrowed, although in-call fluctuations in downlink quality of service are dynamically addressed by the signal processor (28) by either narrowing or broadening the width of the downlink beam by respectively switching antenna elements (12a–12k, 48a–48k) into (92) or out (96) of the adaptive antenna array (14), as shown in FIG.3.
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patent: 2 337 171 (1999-11-01), None
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Liu Yuan An et al. “The Capacity Increase of CDMA by the Interface Suppression for Multibeam Application.” Asia-Pacific Conference on Environmental Electromagnetics CEEM May 2000, pp 86-90.
Gesesse Tilahun
Lee John J.
Mancini Brian M.
Motorola. Inc.
Pace Lalita W.
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