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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

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first number of columns of the sub-matrix may be selected by performing a QR decomposition with column pivoting on the sub-matrix to determine an ordered set of columns that are ordered according to linear independence, and selecting the first number of columns from the ordered set of columns. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first matrix may be a product of the IFFT matrix and a sub-carrier mapping matrix, and the first number of columns may be selected in sequential order from an initial column of the ordered set of columns. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first matrix corresponds to the IFFT matrix and a first subset of columns of the ordered set of columns is associated with one or more guard subcarriers for the OFDM symbol, and a second subset of columns of the ordered set of columns is associated with one or more non-guard subcarriers for the OFDM symbol, and where the first number of columns is selected in sequential order from the second subset of columns.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a wireless communications system that supports subcarrier mapping techniques for guard interval (GI)-based orthogonal frequency division multiplexing (OFDM) communications in accordance with aspects of the present disclosure.

FIG. 2 illustrates an example of a wireless communications system that supports subcarrier MAPPING techniques for GI-based OFDM communications in accordance with aspects of the present disclosure.

權(quán)利要求

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