Spectral encapsulation of OFDM systems based on orthogonalization for short packet transmission

A spectrally encapsulated (SE) orthogonal frequency‐division multiplexing (OFDM) precoding scheme for wireless short packet transmission, which can suppress the out‐of‐band emission (OoBE) while maintaining the advantage of the cyclic prefix (CP)‐OFDM, is proposed. The SE‐OFDM symbol consists of a p...

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Bibliographic Details
Published in:ETRI journal 2020, 42(6), , pp.859-871
Main Authors: Kim, Myungsup, Kwak, Do Young, Kim, Ki‐Man, Kim, Wan‐Jin
Format: Article
Language:English
Subjects:
filter
matrix
OFDM
orthogonal
out‐of‐band
precoder
prefix
spectrum
suffix
전자/정보통신공학
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Summary:A spectrally encapsulated (SE) orthogonal frequency‐division multiplexing (OFDM) precoding scheme for wireless short packet transmission, which can suppress the out‐of‐band emission (OoBE) while maintaining the advantage of the cyclic prefix (CP)‐OFDM, is proposed. The SE‐OFDM symbol consists of a prefix, an inverse fast Fourier transform (IFFT) symbol, and a suffix generated by the head, center, and tail matrices, respectively. The prefix and suffix play the roles of a guard interval and suppress the OoBE, and the IFFT symbol has the same size as the discrete Fourier transform symbol in the CP‐OFDM symbol and serves as an information field. Specifically, as the center matrix generating the IFFT symbol is orthogonal, data and pilot symbols can be allocated to any subcarrier without distinction. Even if the proposed precoder is required to generate OFDM symbols with spectral efficiency in the transmitter, a corresponding decoder is not required in the receiver. The proposed scheme is compared with CP‐OFDM in terms of spectrum, OoBE, and bit‐error rate.
ISSN:1225-6463
2233-7326
DOI:10.4218/etrij.2019-0307