Array antenna system of wireless base station

Claim 2

An array antenna system of a wireless base station in CDMA mobile communications, comprising: a beam former for forming a plurality of electric beams by applying beam forming to signals received by a plurality of antenna elements of an array antenna; a despreading/delay-adjusting unit provided for each path of multipaths for despreading each of the plurality of beams conforming to signals which arrive via said path, applying a delay adjustment conforming to the path to despread signals having a desired signal component that is larger than a set value, and outputting the despread signals having the delay adjustment applied; a combiner for outputs from each of said despreading/delay-adjusting units; and a searcher which includes a delay profile measuring unit for measuring and retaining delay profiles that indicate temporal transitions of levels of all beams output by said beam former and a path detector for detecting on a per-beam basis, from the delay profile of each beam, a path for which the beam level is high, wherein said despreading/delay-adjusting unit provided for each path inputting, to said combiner, a despread signal conforming to the beam of the high level from among the beams of its own path.

Claim 3

The system according to claim 1 , wherein said searcher measures and retains the delay profile of each beam by time sharing processing.

Claim 4

An array antenna system of a wireless base station in CDMA mobile communications, comprising: a beam former for forming a plurality of electric beams by applying beam forming to signals received by a plurality of antenna elements of an array antenna; a despreading/delay-adjusting unit provided for each path of multipaths for despreading each of the plurality of beams conforming to signals which arrive via said path, applying a delay adjustment conforming to the path to despread signals having a desired signal component that is larger than a set value, and outputting the despread signals having the delay adjustment applied; a combiner for outputs from each of said despreading/delay-adjusting units; a signal measuring unit for measuring, in regard to all beams of all paths of the multipaths, the size of a desired signal component in terms of power, correlation value or signal/interference ratio; and a selecting unit for obtaining, from among all beams of all paths, a beam for which the result of measurement of a desired signal component is largest, selecting from each path a despread signal that conforms to this beam, and inputting each despread signal to said combiner.

Claim 5

An array antenna system of a wireless base station in CDMA mobile communications, comprising: a beam former for forming a plurality of electric beams by applying beam forming to signals received by a plurality of antenna elements of an array antenna; a despreading/delay-adjusting unit provided for each path of multipaths for despreading each of the plurality of beams conforming to signals which arrive via said path, applying a delay adjustment conforming to the path to despread signals having a desired signal component that is larger than a set value, and outputting the despread signals having the delay adjustment applied; a combiner for outputs from each of said despreading/delay-adjusting units; a signal measuring unit for measuring, in regard to all beams of all paths of the multipaths, the size of a desired signal component in terms of power, correlation value or signal/interference ratio; and a selecting unit for obtaining, from among all beams of all paths, a beam for which the result of measurement of a desired signal component is largest, selecting from each path a despread signal that conforms to this beam, and inputting each despread signal to said combiner.

Claim 6

An array antenna system of a wireless base station in CDMA mobile communications, comprising: a beam former for forming a plurality of electric beams by applying beam forming to signals received by a plurality of antenna elements of an array antenna; a despreading/delay-adjusting unit provided for each path of multipaths for despreading each of the plurality of beams conforming to signals which arrive via said path, applying a delay adjustment conforming to the path to despread signals having a desired signal component that is larger than a set value, and outputting the despread signals having the delay adjustment applied; a combiner for outputs from each of said despreading/delay-adjusting units; a signal measuring unit for measuring, in regard to all beams of all paths of the multipaths, the size of a desired signal component in terms of power, correlation value or signal/interference ratio; and a selecting unit for selecting the despread signals of one or a plurality of beams, for which result of measurement by said signal measuring unit is large, and inputting the selected despread signals to said combiner, wherein a plurality of said despreading/delay-adjusting unit of respective paths are provided at different directivities, and, from among despread signals of all beams that have entered all of said despreading/delay-adjusting units, those having desired signal components that are large are selected and combined.

Claim 7

An array antenna system of a wireless base station in CDMA mobile communications, comprising: a beam former for forming a plurality of electric beams by applying beam forming to signals received by a plurality of antenna elements of an array antenna; a despreading/delay-adjusting unit provided for each path of multipaths for despreading each of the plurality of beams conforming to signals which arrive via said path, applying a delay adjustment conforming to the path to despread signals having a desired signal component that is larger than a set value, and outputting the despread signals having the delay adjustment applied; a combiner for outputs from each of said despreading/delay-adjusting units; a signal measuring unit for measuring, in regard to all beams of all paths of the multipaths, the size of a desired signal component in terms of power, correlation value or signal/interference ratio; and a selecting unit for selecting the despread signals of one or a plurality of beams, for which result of measurement by said signal measuring unit is large, and inputting the selected despread signals to said combiner, wherein a plurality of said despreading/delay-adjusting unit of respective paths are provided at different directivities, and, from among despread signals of all beams that have entered all of said despreading/delay-adjusting units, those having desired signal components that are large are selected and combined.

Claim 8

An array antenna system of a wireless base station in CDMA mobile communications, comprising: a beam former for forming a plurality of electric beams by applying beam forming to signals received by a plurality of antenna elements of an array antenna; a despreading/delay-adjusting unit provided for each path of multipaths for despreading each of the plurality of beams conforming to signals which arrive via said path, applying a delay adjustment conforming to the path to despread signals having a desired signal component that is larger than a set value, and outputting the despread signals having the delay adjustment applied; a combiner for outputs from each of said despreading/delay-adjusting units; a received-data decision unit for deciding received data based upon the output of the combiner; a selection unit for each path for selecting a plurality of despread signals having a desired signal component that is large; an adaptive controller for each path for deciding a weighting coefficient by adaptive control using the selected despread signals and results of deciding the received data; and a weighting unit for each path for multiplying each despread signal by said weighting coefficient, combining the products and outputting the result; said combiner combining outputs of said weighting unit, and said received-data decision unit deciding received data based upon an output from said combiner.

Claim 9

An array antenna system of a wireless base station in CDMA mobile communications, comprising: a beam former for forming a plurality of electric beams by applying beam forming to signals received by a plurality of antenna elements of an array antenna; a despreading/delay-adjusting unit provided for each path of multipaths for despreading each of the plurality of beams conforming to signals which arrive via said path, applying a delay adjustment conforming to the path to despread signals having a desired signal component that is larger than a set value, and outputting the despread signals having the delay adjustment applied; a combiner for outputs from each of said despreading/delay-adjusting units; a received-data decision unit for deciding received data based upon the output of the combiner; a selection unit for each path for selecting a plurality of despread signals having a desired signal component that is large; an adaptive controller for each path for deciding a weighting coefficient by adaptive control using the selected despread signals and results of deciding the received data; and a weighting unit for each path for multiplying each despread signal by said weighting coefficient, combining the products and outputting the result; said combiner combining outputs of said weighting unit, and said received-data decision unit deciding received data based upon an output from said combiner.

Claim 10

The system according to claim 5 , wherein a channel estimation value is obtained for every selected despread signal and a complex conjugate of the channel estimation value is adopted as an initial value of adaptive control.

Claim 11

The system according to claim 5 , further comprising a channel estimating arithmetic unit for subjecting an output signal of said weighting unit to a channel estimating operation and inputting the result of the channel estimating operation to the combiner.

Claim 12

The system according to claim 5 , further comprising a weight applying unit for applying a maximum-ratio combining weight conforming to the path to an output signal from said weighting unit and inputting the weight-applied signal to the combiner.

Claim 13

An array antenna system of a wireless base station in CDMA mobile communications, comprising: a beam former for forming a plurality of electric beams by applying beam forming to signals received by a plurality of antenna elements of an array antenna; a despreading/delay-adjusting unit provided for each path of multipaths for despreading each of the plurality of beams conforming to signals which arrive via said path, applying a delay adjustment conforming to the path to despread signals having a desired signal component that is larger than a set value, and outputting the despread signals having the delay adjustment applied; a combiner for outputs from each of said despreading/delay-adjusting units; a received-data decision unit for deciding received data based upon the output of said combiner; a selection unit for selecting, from all beams of all paths, a plurality of despread signals having a desired signal component that is large; an adaptive controller for deciding a weighting coefficient by adaptive control using the selected despread signals and results of deciding the received data; and a weighting unit for multiplying each despread signal by the weighting coefficient and outputting the product; said combiner combining the weighted outputs and said received-data decision unit deciding received data based upon an output from said combiner.

Claim 14

An array antenna system of a wireless base station in CDMA mobile communications, comprising: a beam former for forming a plurality of electric beams by applying beam forming to signals received by a plurality of antenna elements of an array antenna; a despreading/delay-adjusting unit provided for each path of multipaths for despreading each of the plurality of beams conforming to signals which arrive via said path, applying a delay adjustment conforming to the path to despread signals having a desired signal component that is larger than a set value, and outputting the despread signals having the delay adjustment applied; a combiner for outputs from each of said despreading/delay-adjusting units; a received-data decision unit for deciding received data based upon the output of said combiner; a selection unit for selecting, from all beams of all paths, a plurality of despread signals having a desired signal component that is large; an adaptive controller for deciding a weighting coefficient by adaptive control using the selected despread signals and results of deciding the received data; and a weighting unit for multiplying each despread signal by the weighting coefficient and outputting the product; said combiner combining the weighted outputs and said received-data decision unit deciding received data based upon an output from said combiner.