METHOD AND APPARATUS FOR CONTROLLING EQUIVALENT ISOTROPIC RADIATED POWER

摘要

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.