DMRS Pattern Visualizer
Visualize 5G NR Demodulation Reference Signal (DMRS) mapping for PDSCH or PUSCH on the 12 × 14 PRB resource element grid. Configure DMRS type, single / double symbol, additional positions and mapping type per 3GPP TS 38.211 §7.4.1.1.
About DMRS
The Demodulation Reference Signal (DMRS) is a UE-specific pilot used by the receiver for channel estimation before it demodulates PDSCH or PUSCH data REs. 5G NR supports two configuration types: Type 1 puts 6 DMRS subcarriers per PRB in a comb-like pattern (2 CDM groups of 6), while Type 2 uses 4 DMRS subcarriers per PRB organised into 3 CDM groups of 4. Type 1 gives higher frequency-domain density; Type 2 supports more orthogonal ports for MU-MIMO.
Mapping type A places the first DMRS at symbol l0 ∈ {2, 3} (signalled in SIB1 / dedicated RRC) and is used for full-slot PDSCH. Mapping type B places DMRS at l0 = 0 and is used for mini-slot / low-latency transmissions. Additional DMRS positions (0–3) are added later in the slot to track fast-changing channels and are specified in TS 38.211 Table 7.4.1.1.2-3.
Related tools
Calculator gave you the answer? Learn the theory in 7 days, free.
$19.99/mo (global) · ₹999/mo (India). Full Pro access — 150+ hands-on exercises, 20+ troubleshooting Scenarios, 17 certifications, TelcoMentor AI coach. No credit card.
- No credit card
- Cancel anytime
- Full Pro access
- TELCOMA since 2009