Abstract:
The Equivalent Isotropic Radiated Power EIRP emitted from an array of antenna elements at an access point (1) of a wireless communication network is controlled. The access point (1) is configured to form one or more beams (3, 5) by applying a weightset for a beamforming weighting matrix (12) to one or more signal streams in a first mode of operation. The EIRP is controlled by calibrating transmission phase and gain of a respective transmit chain (13a - 13n) for each antenna element (14a - 14n), providing a polar radiation model for an antenna element of the array, and determining a weightset for the weighting matrix (12) subject to a constraint that a maximum total EIRP for the one or more beams in combination in any azimuth direction is maintained within a predetermined EIRP limit. The determination is based at least on a spatial separation of the antenna elements, the polar radiation model and the calibrated transmission phase and gain of each respective transmit chain.
Abstract:
An antenna comprising a reflector (20) connected to a motor drive (30), a primary radiator (30) for transceiving a radio beam at an operating frequency impinged on the reflector (20) is disclosed. A coarse alignment system comprising a motor drive is connected to the reflector (20) for driving at least one of the rotation and the tilting of the reflector. The coarse alignment system (70; 270; 370; 470) comprising an auxiliary antenna (50) connected to the control device (60) for communicating with a further auxiliary antenna (10b), at a second frequency different from the operating frequency. A fine alignment system is also present for electronic adjustment of the radio beam. A control device controls the coarse alignment system and the fine alignment system.
Abstract:
Specific Absorption Rate (SAR) mitigation techniques are described herein. In one or more embodiments, a host device is configured to implement a SAR mitigation algorithm to maintain compliance with regulatory requirements. The SAR mitigation algorithm may be configured to control radio frequency transmissions (e.g., output levels) for one or more antennas of the host device based at least in part upon an arrangement of an accessory device relative to the host device. By so doing, the SAR mitigation algorithm accounts for adverse influences that accessory devices may have upon radio frequency (RF) emissions from the antennas in some arrangements. The SAR mitigation algorithm may be further configured to account for user presence indications along with accessory device arrangements and adapt transmission power levels accordingly.
Abstract:
A method and apparatus for testing a data signal amplifier having an output signal power dependent upon multiple signal power control parameters, e.g., signal gain control and amplifier bias current control.
Abstract:
A method and apparatus for testing a data signal amplifier having an output signal power dependent upon multiple signal power control parameters, e.g., signal gain control and amplifier bias current control.
Abstract:
A method and apparatus for performing beamforming are provided herein. During operation, a mobile device will notify a base station of the situation in which one or more of its antennas has become unusable. Using this technique, the Multiple Input, Multiple Output (MIMO) algorithms employed at the base station will be adjusted accordingly.
Abstract:
Methods and apparatus for providing a transmit signal strength message. According to one embodiment of the invention, a transmit signal strength message is generated (212) using a first cell based, at least in part, on transmit signal power levels of the first cell and a second cell, which is then sent (214) for broadcast through the first cell.