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

The Institute of Electronics and Information Engineers (대한전자공학회)
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DFT-based Channel Estimation Scheme for Sidelink in D2D Communication

D2D 통신에서 사이드링크를 위한 DFT 기반 채널 추정 기법

  • 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 : 2015.09.21
  • Accepted : 2015.11.17
  • Published : 2015.12.25
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Abstract

Recently, 3rd Generation Partnership Project (3GPP) has developed device-to-device (D2D) communication to cope with the explosively increasing mobile data traffic. The D2D communication uses sidelink based on single carrier-frequency division multiple access (SC-FMDA) due to its low peak-to-average power ratio (PAPR). In addition, demodulation reference signal (DMRS) is designed to support multiple input multiple output (MIMO). In this paper, we propose the DFT-based channel estimation scheme for sidelink in D2D communication. The proposed scheme uses the 2-Dimensional Minimum Mean Square Error (2-D MMSE) interpolation scheme for the user moving at a high speed. We perform the system level simulation based on 20MHz bandwidth of 3GPP LTE-Advanced system. Simulation results show that the proposed channel estimation scheme can improve signal-to-interference-plus-noise ratio (SINR), throughput and spectral efficiency of conventional scheme.

최근, 3GPP (3rd Generation Partnership Project) 에서는 폭발적으로 증가하고 있는 모바일 데이터 트래픽을 수용하기 위하여 기기 간 직접(Device-to-Device, D2D) 통신을 개발하고 이에 대한 연구가 활발히 진행되고 있다. D2D 통신을 위해 이용되는 링크를 사이드링크라 하며, 사이드링크는 낮은 PAPR (Peak to Average Power Ratio)을 위해 SC-FDMA (Single Carrier-Frequency Division Multiple Access)를 기반으로 한다. 또한, DMRS (DeModulation Reference Signal)를 사용함으로써 MIMO (Multiple Input Multiple Output) 전송이 가능하게 한다. 본 논문에서는 D2D 통신에서 사이드링크를 위한 DFT 기반 채널 추정 기법을 제안한다. 제안 기법은 빠른 속도로 움직이는 사용자의 채널 추정이 가능하도록 2-D MMSE (2-Dimensional Minimum Mean Square Error) 보간 기법을 사용한다. 시스템 레벨 시뮬레이션은 3GPP LTE-Advanced 시스템의 20MHz 대역을 기반으로 이루어 졌으며, 시뮬레이션 결과 제안한 채널 추정 기법을 통해 기존 기법보다 SINR(Signal-to-Interference-plus-Noise Ratio), 전송률 및 스펙트럼 효율 측면에서 성능 향상을 가져다주는 것을 확인하였다.

Keywords

References

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