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Answer» DMRS/DRS is uplink reference SIGNAL.
Used for :
- Channel Estimation and SYNCHRONIZATION in UL
- EnodeB can use DMRS for calculating TA command for each UE.
Two Types: 1) PUSCH DMRS.
2) PUCCH DMRS.
PUSCH DMRS:
- Included in EVERY resource block allocated to UE for PUSCH transmission.
- Distributed only in Frequency domain to preserve the PAPR characteristic of SC-FDMA.
- 12 Resource element per resource block allocated to PUSCH DMRS.
PUCCH DMRS:
- Included in every resource block allocated to UE for PUCCH transmission(if transmitted).PUCCH occupies 2 resource block per 1 ms SUBFRAME when transmitted.
- No of REs used for PUCCH DMRS depends on
a) PUCCH format to be transmitted and whether
b) normal or extended cyclic prefix used.
- PUCCH DRMS used more no of bits in case of format 1,1a,1b and less no of bits in CASEOF format 2, 2a, 2b.
DMRS/DRS is uplink reference signal. Used for : PUSCH DMRS: PUCCH DMRS:
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