name: DM-RS
full_form: Demodulation Reference Signal
context: Variable/configurable DM-RS patterns for data demodulation are supported. At least, one configuration supports front-loaded DM-RS pattern. Front-loaded DM-RS is mapped over 1 or 2 adjacent OFDM symbols. Additional DM-RS can be configured for the later part of the slot. NR aims for performance at least comparable to DM-RS of LTE in scenarios where applicable for both LTE and NR. DM-RS configuration can be up to the maximum number of DM-RS ports. At least, the 8 orthogonal DL DM-RS ports are supported for SU-MIMO and the maximal 12 orthogonal DL DM-RS ports are supported for MU-MIMO. At least for CP-OFDM, NR supports a common DM-RS structure for DL and UL where the exact DM-RS location, DM-RS pattern, and scrambling sequence can be the same or different. DM-RS for same or different links can be configured to be orthogonal to each other. For DL DM-RS port multiplexing, FDM (including comb), CDM (including OCC and Cyclic shift) and TDM are considered. PN sequence is supported for CP-OFDM.
description: Demodulation Reference Signal (DM-RS) is a critical network attribute used in the demodulation process of data transmission in New Radio (NR) and Long-Term Evolution (LTE) networks. It refers to the reference signals used for channel estimation and demodulation at the receiver end.
explanation: The context explicitly mentions DM-RS as a configurable parameter for data demodulation, highlighting its role in supporting various transmission scenarios and modes, such as SU-MIMO and MU-MIMO. This classification is justified based on the detailed description of DM-RS configuration options and its significance in ensuring optimal network performance.
section_title: 8.2.1.6.4.2DM-RS
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