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

The Institute of Electronics and Information Engineers (대한전자공학회)
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Soft Decision based Advanced Receiver to Suppress and Cancel the Interference in D2D Communication Underlaying Cellular Network

셀룰러 네트워크상의 D2D 통신 시스템에서 간섭 억제 및 제거를 위한 연판정 기반 향상된 수신기

  • Moon, Sangmi (School of Electronics & Computer Engineering Chonnam National University) ;
  • Chu, Myeonghun (School of Electronics & Computer Engineering Chonnam National University) ;
  • Kim, Hanjong (School of Electrical, Electronics & Communication Engineering, Korea University of Technology and Education) ;
  • Kim, Daejin (School of Electronics & Computer Engineering Chonnam National University) ;
  • Kim, Cheolsung (School of Electronics & Computer Engineering Chonnam National University) ;
  • Hwang, Intae (School of Electronics & Computer Engineering Chonnam National University)
  • 문상미 (전남대학교 전자컴퓨터공학부) ;
  • 추명훈 (전남대학교 전자컴퓨터공학부) ;
  • 김한종 (한국기술교육대학 정보기술공학부) ;
  • 김대진 (전남대학교 전자컴퓨터공학부) ;
  • 김철성 (전남대학교 전자컴퓨터공학부) ;
  • 황인태 (전남대학교 전자컴퓨터공학부)
  • Received : 2015.09.14
  • Accepted : 2015.11.17
  • Published : 2015.12.25
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Abstract

Cellular Network assisted device-to-device (D2D) communication has been growing to reduce the overload of eNodeB and mitigate the frequency shortage. However, by sharing the uplink frequency resource with the cellular network, the interference between cellular and D2D is increased. In this paper, we propose the advanced receiver based on soft decision to reduce the interference between cellular and D2D. The proposed receiver can suppress and cancel the interference by calculating the unbiased estimation value of interference signal using minimum mean square error (MMSE) or interference rejection combing (IRC) receiver. The interference signal is updated using soft information expressed by log-likelihood ratio (LLR). We perform a system level simulation based on the 20-MHz bandwidth of the 3GPP LTE-A system. Simulation results show that the proposed receiver can improve SINR, throughput and spectral efficiency compared to conventional receivers.

셀룰러 네트워크에서 기지국의 과부하를 줄이고 주파수 부족 현상을 완화시킬 수 있는 D2D(Device-to-Device) 통신에 대한 연구가 활발히 진행되고 있다. 하지만 셀룰러 네트워크의 상향링크 주파수 자원을 공유함으로써 상호간의 간섭은 증가하게 된다. 본 논문에서는 셀룰러와 D2D 사이의 간섭을 줄이기 위하여 연판정 기반의 향상된 수신기를 제안한다. 제안한 수신기는 MMSE (Minimum Mean Square Error) 또는 IRC (Interference Rejection Combing) 수신기를 통해 간섭 신호의 불편 추정 (unbiased estimation) 값을 계산 하고 간섭 신호를 억제 및 제거한다. 간섭 신호는 LLR (Log-Likelihood Ratio)로 표현되는 소프트 정보를 통해 업데이트 한다. 시스템 레벨 시뮬레이션은 3GPP LTE-A 시스템의 20MHz 대역을 기반으로 이루어 졌으며, 시뮬레이션 결과 제안한 수신기를 통해 기존 수신기보다 SINR, 전송률 및 스펙트럼 효율 측면에서 성능 향상을 가져다주는 것을 확인하였다.

Keywords

References

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