Howtosignalprocessing
What is use of Dmrs in 5G?
This slide shows a list of physical signals for downlink and some of them are addressed in other episodes of these "5G Explained" video series. DM-RS are used for channel estimation and demodulation of associated physical channels. They can also be used to estimate receive signal power, as is already the case in LTE.
What is front loaded Dmrs?
The basic DMRS pattern is front loaded, as the DMRS design takes into account the early decoding requirement to support low-latency applications. For low-speed scenarios, DMRS uses low density in the time domain.
What is Dmrs Type A?
Type A means it is on symbol 2 or 3 if DMRS is single symbol, in frequency domain it is on alternating subcarriers if it is type 1, it is separated by 6 SCs with DMRS on 2 consecutive SCs if it is type 2.
What is Dmrs Type 2?
In Configuration type 2, the minimum resource element group in frequency domain is two consecutive REs. See the pictures in Resource Element Mapping. What is the effect of port number on DMRS resource element position ? As antenna port number changes, the location of DMRS position in frequency domain changes.
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