name: FD
full_form: Frequency Domain
context: For the evaluation of NOMA, the Rel.15 NR DMRS design is reused for the evaluation purpose for number of DMRS ports <= 12. In addition, different DM-RS designs to increase the number of DMRS ports compared to Rel.15 DM-RS have been considered by different sources. The following approaches are used in evaluations: 1) OCC code in both time and frequency domain, e.g., - Same pattern as Rel-15 DMRS Type 2 with extended OCC code, i.e., length-4 FD OCC and length-2 TD OCC [53][58][60]; or length-2 FD OCC and length-4 TD OCC for 24 ports [53]; or length-4 FD OCC, and length-4 TD OCC for 48 ports [54]; 2) Different numerologies, e.g., - Two OFDM symbols overhead and ZC sequences with up to 3 roots and 24 CSs [55] for up to 72 ports. 3) Sparse frequency domain structure, e.g., - Same pattern as Rel-15 DMRS Type 2 with 6 CDM group (length-2 FD-OCC and length-2 TD-OCC) for 24 ports [56][57][60]; - Same pattern as Rel-15 DM-RS Type 1 with Comb 4 with 2 CSs and length-2 TD-OCC for 16 ports [57]; -
description: Frequency Domain (FD) is a technology used in telecommunications, specifically in the context of 5G New Radio (NR) Demodulation Reference Signal (DM-RS) designs. It refers to the use of frequency domain processing techniques for signal transmission and reception.
explanation: The provided context from 3GPP TS 38.812 highlights the use of Frequency Domain in DM-RS designs, specifically mentioning FD OCC codes and sparse frequency domain structures. This indicates that Frequency Domain is a technological aspect of telecommunications, hence classified as Technology.
section_title: A.4.13DM-RS designs for evaluation
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