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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 the example of FIG. 4, a UW may be used for the GI, where the UW is spread along with data 405 (having length Nd) for the symbol, with the GI samples provided in redundancy carriers 410, having a length Nr. In this example, the GI (e.g. a tail and optionally a header GI) may be provided along with data to a permutation matrix (P) 415. A subcarrier mapping matrix 420 (e.g., mapping matrix B) may be applied to the permuted samples and the mapped output provided to IFFT 425 (e.g., for an IFFT of length Nfft, represented by matrix FNfft?1). The output of IFFT 425 may provide an OFDM symbol 430 having a length (Nfft) 435 having data of length x and with a GI that has an optional head 440 (of length Ns) and a tail 445 (of length Nu, where Ns+Nu is the total GI length).

In the systematic approach for generating the GI, redundant sub-carriers 410 are inserted at the IFFT 425 input, where a number of such subcarriers (e.g., Nr) is dependent on data (d) length (e.g., Nd) and number of redundant carriers 410 (Nr). As discussed herein, mapping the redundancy subcarriers into the IFFT 425 input may have an impact on power requirements for transmission of the OFDM symbol 430. For example, selection of unoptimized locations or mapping may yield a relatively high energy at the IFFT 425 output, requiring relatively high power requirements that may not be sustainable by the transmitting device. In accordance with various aspects discussed herein, the permutation (P) matrix 415 may be provided to manage the possible energy increase at the IFFT 425 output. The IFFT 425 output may be represented by (assuming no head GI and thus no Ns):

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