Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Performance of an Adaptive-MCM System with Combining AMC and MIMO Schemes

AMC와 MIMO 기법이 결합된 Adaptive-MCM 시스템의 성능 분석

  • 서창우 (전남대학교 전자컴퓨터공학과) ;
  • 조인식 (전남대학교 전자컴퓨터공학과) ;
  • 윤길상 (전남대학교 전자컴퓨터공학과) ;
  • 이정환 (전남대학교 전자컴퓨터공학과) ;
  • 황인태 (전남대학교 전자컴퓨터공학과)
  • Received : 2009.09.07
  • Accepted : 2009.09.21
  • Published : 2010.02.27
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Abstract

The proposal set out in this paper, is the Adaptive-MCM(Modulation, Coding and MIMO) system, which results from the combination of adaptive modulation and coding (AMC) and multiple input multiple output (MIMO) schemes. The performance of this system is analyzed through computer simulation. By using the MIMO scheme adaptively as well, the proposed Adaptive-MCM system, presents a better improvement of data rate and error performance compared to the AMC system. The throughput performance of the Adaptive-MCM system is analyzed and compared with the throughput performance of Non-Adaptive-MCM Systems. As a result of the simulation, we can infer that, at a fixed MCM level, there is an improvement of the trade-off between secure Signal to Noise Ratio (SNR) and a high data rate. Consequently, this trade-off improvement results in a better average data rate.

본 논문에서는 AMC(Adaptive Modulation and Coding) 기법에 MIMO(Multiple Input Multiple Output) 기법이 결합된 Adaptive-MCM(Modulation, Coding and MIMO) 시스템을 제안하고, 모의실험을 통해 그 성능을 분석한다. AMC 기법은 채널 환경에 따라서 변조방식, 코드율을 적응적으로 변화시켜 전송률과 신뢰도의 향상을 가져온다. 제안된 Adaptive-MCM 시스템은 채널 환경에 따라서 MIMO 기법을 적응적으로 활용함으로써 기존의 변조방식과 코드율의 조합에 국한된 AMC 기법보다 더욱 향상된 전송률과 에러 성능을 가져 오게 한다. 제안된 시스템의 성능 분석은 Adaptive-MCM 시스템을 적용한 시스템과 적용하지 않은 시스템의 각 전송률 결과를 바탕으로 비교 수행되었다. 실험결과, Adaptive-MCM 시스템을 적용함으로써 각 MCMS(Modulation, Coding, and MIMO Scheme) 레벨에 해당하는 조합을 고정적으로 사용하는 시스템에서 나타났던 SNR(Signal to Noise Ratio) 확보와 데이터율 증가 사이의 Trade-Off 관계 개선이 이루어졌으며, 이를 통해 평균 데이터율의 향상을 가져올 수 있었다.

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