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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Spectral encapsulation of OFDM systems based on orthogonalization for short packet transmission

  • Kim, Myungsup (Department of Mathematical Sciences, Korea Advanced Institute of Science and Technology) ;
  • Kwak, Do Young (Department of Mathematical Sciences, Korea Advanced Institute of Science and Technology) ;
  • Kim, Ki-Man (Department of Radio Communication Engineering, Korea Ocean and Maritime University) ;
  • Kim, Wan-Jin (Agency for Defense Development)
  • Received : 2019.06.25
  • Accepted : 2019.09.16
  • Published : 2020.12.14
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Abstract

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.

Keywords

Acknowledgement

The authors wish to thank Dr. Lim Jong Soo at ETRI for the helpful discussions and the anonymous reviewers for their valuable comments.

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