Claims:1. A method for beamforming used in a communication device having one or more antenna arrays configured to have a plurality of antenna elements, each of the plurality of antenna elements coupled to a corresponding phase shifter of a plurality of phase shifters, the method comprising:
setting a plurality of pre-defined steering angles;
determining an optimized beam forming weight for each of the plurality of phase shifters by maximizing an array gain of the one or more antenna arrays for each steering angle of the plurality of pre-defined steering angles;
generating a set of optimized beam forming weights for each steering angle based on the optimized beam forming weight for each of the plurality of phase shifters; and
configuring the plurality of phase shifters with the set of optimized beam forming weights for a selected steering angle to perform beam forming in a direction of the selected steering angle.

, Description:Technical Field
Various aspects of this disclosure relate generally to a method and a device for beamforming used in wireless communications.

Background
Millimeter wave (mmWave) bands (between 30 GHz and 300 GHz) are an attractive candidate for next-generation cellular systems (5G) due to the vast quantities of spectrum. The main challenge for mmWave is the high path loss resulting from the smaller wavelength. In exploring mmWave, frequencies for wireless communications, indoor and outdoor, a high beamforming gain is required to compensate for the high path loss. Large antenna arrays with phase shifters are used to provide a large antenna gain with a minimum of hardware complexity. An antenna array is a set of individual antennas used for transmitting and/or receiving radio waves, connected together in such a way that their individual currents are in a specified amplitude and phase relationship. Interactions of different phases enhance the signal in one desired direction at the expense of other directions. Thus, an array beam can be produced. The array beam width is inversely proportional to the number of antennas; therefore, a large number of antennas will produce beams with a very narrow half power beam width (HPBW), called pencil beams. Moreover, using low resolution phase shifters may result in significant gaps in spatial resolution, specifically with progressive phase shifting. This is not efficient in many use cases.

Brief Description of the Drawings
In the drawings, like reference characters generally refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention. In the following description, various embodiments of the invention are described with reference to the following drawings, in which:
FIG. 1 shows an exemplary communication network in an aspect of this disclosure.
FIG. 2 shows an exemplary communication network scenario in an aspect of this disclosure.
FIG. 3 shows an exemplary system architecture for hybrid beamforming in an aspect of this disclosure.
FIG. 4 shows details of the exemplary system architecture as shown in FIG. 3
FIG. 5 shows an exemplary system architecture for hybrid beamforming and MIMO OFDM in an aspect of this disclosure.

Description
The following details description refers to the accompanying drawings that show, by way of illustration, specific details and embodiments in which the invention may be practiced.
The word “exemplary” is used herein to mean “serving as an example, instance, or illustration”. Any embodiment or design described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments or designs.
The words “plural” and “multiple” in the description and the claims, if any, are used to expressly refer to a quantity greater than one. Accordingly, any phrases explicitly invoking the aforementioned words (e.g. “a plurality of [objects]”, “multiple [objects]”) referring to a quantity of objects is intended to expressly refer more than one of the said objects. The terms “group”, “set”, “collection”, “series”, “sequence”, “grouping”, “selection”, etc., and the like in the description and in the claims, if any, are used to refer to a quantity equal to or greater than one, i.e. one or more. Accordingly, the phrases “a group of [objects]”, “a set of [objects]”, “a collection of [objects]”, “a series of [objects]”, “a sequence of [objects]”, “a grouping of [objects]”, “a selection of [objects]”, “[object] group”, “[object] set”, “[object] collection”, “[object] series”, “[object] sequence”, “[object] grouping”, “[object] selection”, etc., used herein in relation to a quantity of objects is intended to refer to a quantity of one or more of said objects. It is appreciated that unless directly referred to with an explicitly stated plural quantity (e.g. “two [objects]” “three of the [objects]”, “ten or more [objects]”, “at least four [objects]”, etc.) or express use of the words “plural”, “multiple”, or similar phrases, references to quantities of objects are intended to refer to one or more of said objects.