Dmrs

Some questions about 5G NR CDM group

Some questions about 5G NR CDM group
  1. What is CDM group in 5G?
  2. Why is Dmrs needed?
  3. What is a Dmrs port?
  4. What is Dmrs Type A?

What is CDM group in 5G?

The group of two or four REs for which time and/or frequency direction OCC is applied is called a CDM group and for DM-RS Type 1 and 2 there is thus two and three CDM groups, respectively.

Why is Dmrs needed?

DMRS refers to Demodulation Reference Signal. It is used by 5G NR receiver to produce channel estimates for demodulation of associated physical channel. The design and mapping of DMRS is specific to each of the 5G physical channels viz. PBCH, PDCCH, PDSCH, PUSCH and PUCCH.

What is a Dmrs port?

DMRS refers to demodulation reference signal. It is used by a receiver for radio channel estimation for demodulation of associated physical channel. DMRS design and mapping is specific to each Downlink and Uplink NR channels vize NR-PBCH, NR-PDCCH, NR-PDSCH, NR-PUSCH , NR- PUSCH.

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.

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