Method and device for searching distributed signal sources of base station

Abstract

A method and device are provided for determining distributed signal sources of a base station that includes a pair of circular array antennas that maintain a predetermined distance from each other. The method and device may estimate primary central vertical angles of the distributed signal sources received by each sensor according to TLS-ESPRIT, for example. The method and device may further convert a 2-dimensional cost function into a first 1-dimensional cost function by using the estimated primary central vertical angles of the distributed signal sources. Central horizontal angles may be estimated by making the first 1-dimensional cost function have a maximum. The 2-dimensional cost function may be converted into a second 1-dimensional cost function by using the estimated central horizontal angles of the distributed signal sources. The central vertical angles may be estimated by making the second 1-dimensional function have a maximum.

Description

technical field [0001] The invention relates to searching signal sources of mobile communication base stations, in particular to a method and device for searching distributed signal sources of base stations with adaptive antennas. Background technique [0002] In mobile communication systems, radio signals are sent over multiple paths and thus become distributed signal sources. [0003] The base station usually estimates the arrival direction of the signal from the distributed signal source, that is, the direction of the mobile communication terminal, by using the circular antenna array in FIG. 1 . In the circular antenna array 10 , a plurality of sensors 20 are arranged at predetermined intervals from an axis 30 on a circle having a radius R. As shown in FIG. [0004] Each of the sensors 20 of the circular antenna array 10 individually fulfills the function of an antenna. When each sensor 20 receives a signal from a signal source, the signals received by the sensor(s) 20 ...

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Problems solved by technology

[0018] In addition, conventional means for searching distributed signal sources of base stations must simultaneously estimate the center vertical angle and the center horizontal angle when the 2-D cost function has a maximum value (or minimum value), and also estimate the optimal center vertical angle and circle center Horizontal angle, without considering the local maximum problem of the nonlinear 2-D function of the entire distributed signal source, thus requiring more calculations to estimate the signal arrival direction of the distributed signal source

Therefore, conventional means for searching distributed sources of base stations severely loads the beamforming system using a circular antenna array (or adaptive antenna)

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