Journal of Communications and Networks

  • 제18권3호
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  • Pages.439-445
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  • 2016
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  • 1229-2370(pISSN)
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  • 1976-5541(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
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Sparse Index Multiple Access for Multi-Carrier Systems with Precoding

  • Choi, Jinho (School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology (GIST))
  • 투고 : 2015.05.22
  • 심사 : 2015.01.20
  • 발행 : 2016.06.30
⟨ 이전 논문 다음 논문 ⟩

초록

In this paper, we consider subcarrier-index modulation (SIM) for precoded orthogonal frequency division multiplexing (OFDM) with a few activated subcarriers per user and its generalization to multi-carrier multiple access systems. The resulting multiple access is called sparse index multiple access (SIMA). SIMA can be considered as a combination of multi-carrier code division multiple access (MC-CDMA) and SIM. Thus, SIMA is able to exploit a path diversity gain by (random) spreading over multiple carriers as MC-CDMA. To detect multiple users' signals, a low-complexity detection method is proposed by exploiting the notion of compressive sensing (CS). The derived low-complexity detection method is based on the orthogonal matching pursuit (OMP) algorithm, which is one of greedy algorithms used to estimate sparse signals in CS. From simulation results, we can observe that SIMA can perform better than MC-CDMA when the ratio of the number of users to the number of multi-carrier is low.

키워드

과제정보

연구 과제 주관 기관 : GIST Research Institute (GRI)

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