F.6 Wave vector space grid

37.145-23GPPActive Antenna System (AAS) Base Station (BS) conformance testingPart 2: radiated conformance testingRelease 17TS

If EUT is mounted along the yz plane as shown in figure F.2.2-1, the reference step in wave vector space can be determined by:

where D_y is the length of radiating parts of EUT along y-axis, D_z is the length of radiating parts of EUT along the z-axis.

According to the relationship between the normalized wave vector and spherical coordinate, the wave vector can be represented as following:

The total radiated power (TRP) in the wave vector space is determined by:

Where due to practical reasons such as time constraints or turn-table precision, measurement with the reference steps is not practical, sparser grids can be used. Use of sparse grids can lead to errors in TRP assessment. In order to characterize these errors, the SF (sparsity factor) of the grid is defined as:

Where and are the actual steps used in the wave vector space in the measurement and the upper bound of their value is 15 degrees.