US 2003/0215006 A1Published application

Apparatus, and associated method, for facilitating antenna weight selection utilizing deterministic perturbation gradient approximation

AssigneeNokia Corporation

InventorBalaji Raghothaman

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Abstract

Apparatus, and an associated method, for facilitating selection of optimal antenna weightings by which to weight signals sent in a communication system that utilizes closed-loop transmit diversity. A deterministic perturbation gradient approximation technique is utilized in which perturbation vectors are selected by a selector and applied, by an applicator, to antenna weighting elements. A selected set of perturbation vectors are applied to the antenna weighting elements in both a positive direction and a negative direction. A detector at a receiving station measures in disassociated with the signals communicated thereto, once weighted with the perturbation vectors. A single-bit feedback value is returned to the sending station, and the antenna weightings are appropriately adjusted.

Claims20

Dependent claims

In a communication system having a first communication station and a second communication station, the first communication station for communicating a communication signal to the second communication station, the communication signal weighted at a first weighting element of the first communication station by a first antenna weight and the communication signal weighted at least at a second weighting element of the first communication station with at least a second antenna weight, an improvement of apparatus for facilitating optimization of selection of the first and at least second antenna weights, separately, said apparatus comprising:

a perturbation vector selector coupled to the first communication station, said perturbation vector selector for selecting at least a first set of perturbation vector values to form at least a first selected perturbation vector;
and
a perturbation vector applicator coupled to said perturbation vector selector, said perturbation vector applicator for selecting application of applying the perturbation values forming the at least the first selected perturbation vector to the first and at least second weighting elements, the perturbation values applied to the first and at last second weighting element at least in part determinative of the first and at least second antenna weights.

In a method for communicating in a communication system having a first communication station and a second communication station, the first communication station for communicating a communication signal to the second communication station, the communication signal weighted at a first weighting element of the first communication station by a first antenna weight and the communication signal weighted at least at a second weighting element of the first communication station with at least a second antenna weight,, an improvement of a method for facilitating optimization of situation of the first and at least second antenna weights, respectively, said method comprising:

selecting at least a first selected perturbation vector formed of perturbation values;
applying the perturbation values forming the at least the first selected perturbation vector to the first and at least second antenna weighting elements, the perturbation values applied to the first and at least second weighting element at least in part determinative of the first and at least second antenna weights;
and
sending the communication signal, once weighted by the first and at least second antenna weights, to the second communication station.

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Dependencies are inferred from the claim text.