name: DFT
full_form: Discrete Fourier Transform
context: matrix indicator) - Channel quality feedback - At least, for single panel case, codebook-based PMI feedback has two-stage, i.e., W=W1W2, - At least for type I CSI feedback, support multi-panel scenarios by having co-phasing factor across panels. - Alt1: only wideband co-phasing factor across panels - Alt2: wideband and subband co-phasing factor across panels - Type II feedback: Enhanced - Explicit feedback and/or codebook-based feedback with higher spatial resolution - At least, one scheme is supported from the following Category 1, 2, and/or 3 for Type II CSI. - Category 1: precoder feedback based on linear combination codebook - Dual-stage W = W1W2 codebook - W1 consists of a set of L orthogonal beams taken from 2D DFT beams - The set of L beams is selected out of a basis composed of oversampled 2D DFT beams - L {2, 3, 4} (L is configurable) - Beam selection is wideband - W2: L beams are combined in W2 with common W1 - Subband reporting of phase quantization of beam combining
description: The Discrete Fourier Transform (DFT) is a mathematical technique used for efficiently calculating the discrete-time Fourier transform of a sequence. In the context of 3GPP TS 38.802, DFT is utilized in the process of channel quality feedback and CSI measurement and reporting, specifically in the generation of beams for precoder feedback based on linear combination codebook.
explanation: DFT is classified as a Technology because it refers to a specific mathematical standard used within telecommunications operations, particularly in the context of 5G systems and CSI feedback mechanisms.
section_title: 6.1.6.3CSI measurement and reporting
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