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Adaptive antenna array and method of controlling operation thereof

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.
Owner:GOOGLE TECH HLDG LLC

Synchronous powder feeding space laser machining and three-dimensional forming method and device

The invention discloses a synchronous powder feeding space laser machining and three-dimensional forming method and device. A three-dimensional solid is divided into a plurality of forming units according to the form simplification and nozzle fusion covering scanning accessibility principle, each forming unit is divided into a plurality of laminates, a mode for single-beam gas-carried powder feeding in a hollow annular laser is adopted, a mechanical arm is controlled to drive an in-laser powder feeding nozzle to move for scanning in filling areas and boundary areas of the laminates according to a preset trajectory, and forming fusion covering and stacking forming of the laminates are sequentially completed, so that forming fusion covering and stacking forming of the whole unit are completed. The device comprises the in-laser powder feeding nozzle, a laser generator, the mechanical arm, a control module, a transmission optical fiber, a gas-carried powder feeder and a gas source. The control module is connected with the mechanical arm, the laser generator and the gas-carried powder feeder. The in-laser powder feeding nozzle is fixed to the front end of the mechanical arm and can make spatial motion along with the mechanical arm. Through the method and device, fusion covering and three-dimensional stacking forming on any surface of the space can be achieved, and supportless three-dimensional forming of parts with complex structures such as a hanging structure and a cavity can be achieved.
Owner:SUZHOU UNIV

Adaptive antenna array and method of controlling operation thereof

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 FIGS. 3a and 3b.
Owner:GOOGLE TECH HLDG LLC
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