전자공학회논문지 (Journal of the Institute of Electronics and Information Engineers)

  • 제53권6호
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  • Pages.3-14
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  • 2016
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  • 2287-5026(pISSN)
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  • 2288-159X(eISSN)
대한전자공학회 (The Institute of Electronics and Information Engineers)
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5세대 이동통신을 위한 OFDM, UFMC, FBMC 시스템의 BER과 스펙트럼의 비선형 특성 평가

Nonlinear Effect on the BER and Spectrum Shape of OFDM, UFMC and FBMC for 5G Mobile Communication

  • 이동형 (SK 텔레콤) ;
  • 안창영 (충북대학교 전자공학과/컴퓨터 정보통신연구소) ;
  • 궁경록 (충북대학교 전자공학과/컴퓨터 정보통신연구소) ;
  • 김병재 (충북대학교 전자공학과/컴퓨터 정보통신연구소) ;
  • 유흥균 (충북대학교 전자공학과/컴퓨터 정보통신연구소)
  • Lee, Dong-Hyung (SK Telecom) ;
  • An, Changyoung (Department of Electronic Engineering/Research Institute for Computer and Information Communication, Chungbuk National University) ;
  • Kung, Kyung-Lok (Department of Electronic Engineering/Research Institute for Computer and Information Communication, Chungbuk National University) ;
  • Kim, Byeongjae (Department of Electronic Engineering/Research Institute for Computer and Information Communication, Chungbuk National University) ;
  • Ryu, Heung-Gyoon (Department of Electronic Engineering/Research Institute for Computer and Information Communication, Chungbuk National University)
  • 투고 : 2015.10.22
  • 심사 : 2016.06.02
  • 발행 : 2016.06.25
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초록

최근 5G 모바일 통신 시스템에서 요구하는 KPI(Key Performance Indicator)를 만족시키기 위해 새로운 Waveform 연구가 활발하게 진행되고 있다. 연구 중인 차세대 Waveform 중 OOB의 전력을 획기적으로 감소시킬 수 있는 기술로 UFMC 및 FBMC가 잘 알려져 있다. 본 논문에서는 OFDM, UFMC, FBMC 각 시스템의 HPA 비선형성에 대한 특성을 스펙트럼 및 BER 성능 측면에서 평가하고 분석한다. 각 시스템을 설계한 후 HPA 선형 및 비선형 조건에 대한 스펙트럼 및 BER 특성을 평가해본 결과, HPA 비선형 특성이 증가할수록 OFDM, UFMC, FBMC 신호 모두 OOB의 전력 크기가 증가하는 것을 확인할 수 있으며 FBMC가 가장 큰 폭으로 OOB의 전력이 증가하는 것을 확인할 수 있다. 또한 BER 성능 측면에서 보면 HPA 비선 형성이 증가할 때, 모든 시스템의 성능이 열화 되는 것을 확인할 수 있다. 즉, 본 논문에서는 실제 시스템을 구현할 때, HPA 비선형성에 의해서 BER 성능 및 OOB 전력 특성이 열화되어 유사한 특성을 갖게 되므로, 낮은 복잡도와 고속 처리를 할 수 있는 시스템이 유리하다는 것을 확인할 수 있다.

Recently, researches for new waveforms have been carried in order to satisfy KPI for 5G mobile communication system. UFMC and FBMC are well known as ways to reduce OOB power. In this paper, we analyze spectrum of OFDM, UFMC, and FBMC system under nonlinear HPA environment. And then we evaluate and analyze performance of these systems under the same environment. As simulation results, OOB power of OFDM, UFMC, and FBMC increases with HPA nonlinearity increasement. Especially, OOB power of FBMC is the largest increase due to HPA nonlinearity. Also, BER performance of these systems is degraded by increasement of HPA nonlinearity. Therefore, In this paper, we can confirm that a system with low-complexity and high-speed processing is advantageous, because BER performance and OOB power characteristic of these systems are degraded to similar level, when these systems are implemented in real world.

키워드

참고문헌

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