The lteCSIRS
function supports
the creation of multiple non-zero power CSI-RS resources and zero
power CSI-RS.
By default the output symbols are returned as a column vector
and are ordered as they should be mapped into the resource elements
along with lteCSIRSIndices. If, according to the CSI-RS resource subframe
configurations and duplex mode, there are no CSI-RS scheduled in the
subframe, then the output is empty. Optionally the returned symbols
can also include zeros representing the resource elements which should
be unused since they are reserved for CSI-RS symbols in one or more
of the other ports. On assignment into a populated subframe grid,
these zeros create empty resource elements for both Release 8, and
Release 10 and 11 compatibility. When multiple non-zero power resources
and zero power CSI-RS are output, the zero power CSI-RS symbols are
first in the concatenated output, followed by the symbols for the
ordered set of CSI-RS resources.