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There was the familiar assortment of basic Beam options, along with the company's line of small-batch offerings, like Booker's and Knob Creek.
However, the UPA topology for the basic beam set is still available.
Performance comparison of the four different methods to segment the basic beam set is also shown in Figure13.
Figure8 gives an example of X k and illustrates its position in the complete basic beam set as the dotted line surrounds.
Here, we propose a new fast codebook searching method (FCSM), utilizing the UPA topology of the complete basic beam set shown in Figure5.
Since a large size basic beam set is usually adopted, in this section, we propose a fast codebook searching method for the purpose of saving PMI1 calculation time.
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Figure 8 Basic beams in X k are included in the dotted line, equivalent to a beam subset.
Downtilt values of the basic beams are not uniformly distributed in [-π/2,π/2] but centralized in a small range.
These basic beams can be regarded as a set of basic vectors in 3D space, and any spatial vector can be represented using this set.
Inner precoding roughly orients the channel and captures the channel's main lobe by choosing a few basic beams that are adjacent to each other.
If we combine these values together, the complete set of basic beams will be defined, which covers N v × N h directions totally.
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