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

The Institute of Electronics and Information Engineers (대한전자공학회)
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Capacity and Secrecy Rate Analysis of a Frequency-Domain Equal-Gain-Combining TR Scheme for Distributed Antenna Systems in Multi-User Multi-Path Fading Channels

다중 사용자 다중 경로 페이딩 채널에서 분산 안테나 시스템을 위한 주파수 영역 Equal-Gain-Combining TR 기법의 Capacity와 Secrecy Rate 분석

  • Kim, Myoung-Seok (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Lee, Chungyong (Department of Electrical and Electronic Engineering, Yonsei University)
  • 김명석 (연세대학교 전기전자공학과) ;
  • 이충용 (연세대학교 전기전자공학과)
  • Received : 2012.05.15
  • Published : 2012.10.25
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Abstract

Time-reversal (TR) precoding focuses the energy of the effective channel in time and improves receive performance of a single tap receiver. Frequency-domain equal-gain-combining (FD-EGC) TR scheme, which works in linear block precoding fashion, has better temporal focusing performance than the traditional TR. Also, the FD-EGC improves receive performance of minimum mean square error receiver with distributed antenna systems (DAS). The detailed receive performance of the FD-EGC was analyzed in our previous work. In this paper, we focused on capacity analysis of the FD-EGC in DAS. We derived a scaling law which shows how the use of multiple antenna can increase the capacity of the FD-EGC precoding compared with that of no precoding. In addition, we analyze the secrecy rate of the FD-EGC which shows how high-rate messages can be transmitted towards an intended user without being decoded by the other users from the view point of information theoretic security.

시간 반전 (time-reversal, TR) 전처리 기법은 유효 채널의 전력을 특정 시간으로 집중시키는 역할을 하며, 이를 통해 단일 탭 수신기의 수신 성능을 향상시킬 수 있다. 선형 블록 전처리 형태를 가지는 주파수 영역 동일 이득 결합 (frequency-domain equal-gain-combining, FD-EGC) TR 기법은 기존의 TR 기법에 비해 temporal focusing 성능이 뛰어나다. 또한, FD-EGC는 분산 안테나 시스템 (distributed antenna systems, DAS)에서 minimum mean square error 수신기의 수신 성능을 향상시킨다. 본 논문에서는 이러한 FD-EGC의 수신 성능 분석에 그치지 않고, capacity 성능을 분석하는 것에 중점을 두었다. 우선, DAS에서 FD-EGC의 capacity를 유도하였으며, 안테나 수에 따라 capacity가 증가함을 보였다. 이어 정보 이론적 보안 측면에서 secrecy rate를 유도하였으며, 이를 통해 FD-EGC가 다른 사용자에게 보안을 유지하면서도 목표 사용자에게는 많은 양의 정보를 전송할 수 있음을 보였다.

Keywords

References

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