lteEPDCCHDMRS
EPDCCH demodulation reference signals
Description
returns
the Enhanced Physical Downlink Control Channel Demodulation Reference
Signal (EPDCCH DM-RS) symbols for transmission in a single subframe.
By default the symbols are returned as a column vector. The order
of the symbols is the same as the order that results when you use sym
= lteEPDCCHDMRS(enb
,chs
)lteEPDCCHDMRSIndices
to map them into an N-by-M-by-4
array. This array represents the resource element subframe grid across
the four possible EPDCCH antenna ports (p = 107...110).
The symbols are parameterized in terms of a configured PRB pair set which defines:
the overall set of possible EPDCCH candidates and
the aggregation of one or more consecutive enhanced control channel elements (ECCE). This aggregation identifies the specific EPDCCH instance that the DM-RS is associated with.
The DM-RS symbols are created only for the specific PRB pairs and antenna ports that the corresponding EPDCCH is mapped to.
For a localized EPDCCH transmission, the EPDCCH is associated
with a single antenna port from p = 107...110,
dependent on the chs
.RNTI
and
ECCEs selected. Thus, the DM-RS antenna port symbols are output only
for that single port.
For a distributed transmission, the EPDCCH is mapped to two
antenna ports in an alternating fashion. Therefore, the DM-RS symbols
are generated for the PRBs in both ports: p = 107,109
for normal cyclic prefix and p = 107,108 for extended
cyclic prefix. The output is ordered so that the symbols for the lowest
antenna ports index come first. This order matches that of the DM-RS
RE indices produced by lteEPDCCHDMRSIndices
.
allows control of the format of the symbols through the options specified by
sym
= lteEPDCCHDMRS(enb
,chs
,opts
)opts
. You can use this syntax to return the symbols as a
numeric matrix, where each column contains symbols for an active antenna
port.
This function performs no precoding. If necessary, apply precoding externally.
Examples
Input Arguments
Output Arguments
Version History
Introduced in R2014b