5G • RAN
PBCH DMRS
PBCH Demodulation Reference Signal
Reference signal embedded in PBCH allocations used for channel estimation and SSB beam index decoding.
Technical Explanation
PBCH DMRS is pseudo-randomly placed on every fourth subcarrier within PBCH OFDM symbols (symbols 1, 2, and 3 of the SSB). It provides channel estimation for decoding the PBCH payload and encodes the 3 least significant bits of the SSB beam index in FR1 (or all 6 bits in FR2) through sequence generation.
Key Functions
- Enables coherent channel estimation and PBCH equalization
- Encodes SSB beam index LSBs through Gold sequence initialization
- Supports RSRP measurements for beam selection during cell evaluation
Specifications
3GPP TS 38.211
Interfaces
Uu
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