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

專(zhuān)利號(hào)
US11616671B1
公開(kāi)日期
2023-03-28
申請(qǐng)人
QUALCOMM Incorporated（US CA San Diego）
發(fā)明人
Iyab Issam Sakhnini; Hemant Saggar; Tao Luo
IPC分類(lèi)
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(shuō)明書(shū)

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 as quasi-equidistant columns from a total number of columns of the first matrix. 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 sub-matrix includes columns of the first matrix that correspond to a subset of active subcarriers for the OFDM symbol that do not include guard subcarriers associated with a guard band of the OFDM symbol. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first matrix corresponds to the IFFT matrix, and the sub-matrix includes columns of the first matrix that correspond to all subcarriers for the OFDM symbol including guard subcarriers associated with a guard band of the OFDM symbol, and one or more columns of the sub-matrix that are associated with the guard subcarriers may be discarded.

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