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

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Throughput Analysis of an ARQ Scheme with Noisy Feedback Channel over Nakagami Fading Channel

나카가미 페이딩 채널에서 궤환채널의 잡음을 고려한 ARQ 기법의 정보전송율 분석

  • 황재문 (극동정보대학 컴퓨터게임과) ;
  • 박진수 (청주대학교 전자공학과)
  • Published : 2002.12.01
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Abstract

In this paper, the throughput performance of an ARQ scheme is analyzed with noisy feedback channel, in order to exactly analysis for performance of an ARQ scheme. An ARQ mechanism is presented by state diagram, and the throughput of an ARQ scheme is mathematically derived using generation function for a signal flow graph. The channel is modeled by the Nakagami-m fading channel which is distributed over far and wide, and the throughput performance of an ARQ scheme, which is applied in BPSK and BFSK systems, according to feedback gain and fading index m is analyzed through computer simulation. In the results, It is shown conformed that the throughput of an ARQ scheme decreased according to the increase of the noise for feedback channel, but it increased according to the increase of the feedback gain and fading index m. Also, it is shown that the throughput of an ARQ scheme using BPSK system is superior to BFSK system because of the difference of bit error probability between BPSK and BFSK systems.

본 논문에서는 ARQ 기법의 성능을 정확히 분석하기 위해 궤환채널의 잡음을 고려하여 시스템의 성능을 분석하였다. 상태도를 이용하여 ARQ 메카니즘을 표현하였고, 신호흐름 그래프에 대한 생성함수를 이용하여 ARQ 기법의 정보전송율을 수학적으로 유도하였다. 채널은 광범위한 채널환경에 적용할 수 있는 나카가미-m 페이딩 채널모델을 사용하였으며, BPSK 및 BFSK 시스템에 ARQ 기법을 적용하여 궤환이득과 페이딩 지수 m에 따른 시스템의 정보전송율을 컴퓨터 시뮬레이션을 통해 분석하였다. 분석결과, 궤환채널의 잡음이 증가할수록 ARQ 기법의 정보전송율은 감소하지만 궤환이득과 페이딩 지수 m이 증가할수록 ARQ 기법의 정보전송율이 증가됨을 확인하였다. 또한 비트에러확률의 차이로 BFSK에 비해 BPSK의 정보전송율이 우수함을 확인하였다.

Keywords

References

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