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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Spectrally encapsulated OFDM: Vectorized structure with minimal complexity

  • Kim, Myungsup (Future Communications Research Laboratory, NEWHIGHTECH) ;
  • Kwak, Do Young (Department of Mathematical Sciences, Korea Advanced Institute of Science and Technology) ;
  • Jung, Jiwon (Department of Radio Communications, Korea Maritime and Ocean University) ;
  • Kim, Ki-Man (Department of Radio Communications, Korea Maritime and Ocean University)
  • Received : 2020.08.07
  • Accepted : 2020.11.25
  • Published : 2021.08.01
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Abstract

To efficiently use frequency resources, the next 6th generation mobile communication technology must solve the problem of out-of-band emission (OoBE) of cyclic prefix (CP) orthogonal frequency division multiplexing (OFDM), which is not solved in 5th generation technology. This study describes a new zero insertion technique to replace an existing filtering scheme to solve this internal problem in OFDM signals. In the development of the proposed scheme, a precoder with a two-dimensional structure is first designed by generating a two-dimensional mapper and using the specialty of each matrix. A spectral shaping technique based on zero insertion instead of a long filter is proposed, so it can be applied not only to long OFDM symbols, but also very short ones. The proposed method shows that the transmitted signal is completely blocked at the bandwidth boundaries of signals according to the current standards, and it is confirmed that the proposed scheme is ideal with respect to bit error rate (BER) performance because its BER is the same as that of CP-OFDM. In addition, the proposed scheme can transformed into a real time structure through vectorizing process with minimal complexity.

Keywords

Acknowledgement

This work was supported by the Grant UD200010DD of Agency for Defense Development, Republic of Korea.

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