Title:
METHOD AND APPARATUS FOR CONTROLLING EQUIVALENT ISOTROPIC RADIATED POWER
Document Type and Number:
WIPO Patent Application WO/2017/068356
Kind Code:
A3
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.
Inventors:
STRONG PETER (GB)
Application Number:
PCT/GB2016/053285
Publication Date:
May 26, 2017
Filing Date:
October 21, 2016
Export Citation:
Assignee:
CAMBIUM NETWORKS LTD (GB)
International Classes:
H04B7/06; H04B17/10
Domestic Patent References:
| WO2015085510A1 | 2015-06-18 |
Foreign References:
| EP2498462A1 | 2012-09-12 |
Other References:
KUZMINSKIY ET AL: "Downlink beamforming subject to the equivalent isotropic radiated power constraint in WLAN OFDM systems", SIGNAL PROCESSING, ELSEVIER SCIENCE PUBLISHERS B.V. AMSTERDAM, NL, vol. 87, no. 5, 3 February 2007 (2007-02-03), pages 991 - 1002, XP005872006, ISSN: 0165-1684, DOI: 10.1016/J.SIGPRO.2006.09.009
Attorney, Agent or Firm:
EIP (GB)
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