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Subcarrier mapping techniques for guard interval-based orthogonal frequency division multiplexing communications

專利號
US11616671B1
公開日期
2023-03-28
申請人
QUALCOMM Incorporated（US CA San Diego）
發(fā)明人
Iyab Issam Sakhnini; Hemant Saggar; Tao Luo
IPC分類
H04L27/26; H04L5/00
技術(shù)領(lǐng)域
ofdm,matrix,gi,columns,may,symbol,manager,guard,or,samples
地域： CA CA San Diego

摘要

Methods, systems, and devices for wireless communications are described in which a user equipment (UE) or base station may generate orthogonal frequency division multiplexing (OFDM) symbols based on a permutation matrix (P) that permutes guard interval (GI) samples and data samples such that the OFDM symbols have power values across the symbols that are supportable by a transmitting device. The permutation matrix may map GI inputs to a subset of subcarriers for an OFDM communication, where the permutation matrix determined based at least in part on a first number of columns of a sub-matrix of a first matrix. The first matrix may be an inverse fast Fourier transform (IFFT) matrix, or may be a product of the IFFT matrix and a subcarrier mapping matrix. The first number of columns may correspond to a number of subcarriers that carry time-domain GI samples.

說明書

FIG. 6 illustrates an example of a unique word OFDM symbol generation 600 that supports subcarrier mapping techniques for GI-based OFDM communications in accordance with aspects of the present disclosure. The example OFDM symbol generation 600 may represent OFDM symbol generation for communications between a UE 115 and a base station 105. The UE 115 and the base station 105 may be examples of a UE 115 and a base station 105 as described with reference to FIGS. 1 and 2.

In this example, a first matrix (K) 605 may be based on a product of an IFFT matrix (FN?1) and a subcarrier mapping matrix (B) (e.g., K=FN?1B). The number of columns of the first matrix (K) 605 may correspond to Nsc 615 (e.g., where Nsc=Nd+Nr). A total number of columns 610 may correspond to Nfft, and include guard tones. A total number of rows 620 may also correspond to Nfft, and include GI rows Nu 625, and data rows Nx 630. In this example, a sub-matrix of interest (Z) may correspond to the GI rows Nu 625 and the columns Nsc 615. When selecting columns 635 of the sub-matrix of interest (Z) to determine the permutation matrix, in this example, a quasi-equidistant selection may be performed based on Nsc 615. It is noted that equidistant columns of a row sub-matrix of a DFT matrix are orthogonal, in cases where the number of columns needed (Nr) is a factor of the DFT size (e.g., Nfft=16, Nr=4, as illustrated in FIG. 6). If the number of columns needed (Nr) is not a factor of the DFT size (e.g., Nfft=16, Nr=5), the most orthogonal columns are quasi-equidistant.

權(quán)利要求

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