한국항공우주학회지 (Journal of the Korean Society for Aeronautical & Space Sciences)

  • 제42권7호
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  • Pages.610-615
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  • 2014
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  • 1225-1348(pISSN)
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  • 2287-6871(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
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주파수 도약 통신위성 중계기의 다상 DFT 필터뱅크 과도기 응답 분석

Analysis on the transient response of Polyphase DFT filter banks in the frequency hopping communication satellite transponder

  • 투고 : 2014.04.25
  • 심사 : 2014.06.11
  • 발행 : 2014.07.01
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⟨ 이전 논문 다음 논문 ⟩

초록

통신위성 중계기에서 효과적인 다중채널 처리를 위하여 여러 가지 필터뱅크들이 사용되어져 왔다. 특히 구현의 간단함으로 인하여 대역폭이 일정한 복수의 다중채널을 다루는 경우 다상 DFT 필터뱅크가 광법위하게 사용되어져 왔다. 하지만 주파수도약 통신위성 중계기에서 Polyphase DFT 필터뱅크를 사용하여 다중채널 처리를 할 경우 주파수 도약 홉과 홉 사이에서 발생하는 비정상적인 과도기 응답으로 인하여 다상 DFT 필터뱅크의 사용에 있어 제약이 발생할 수 밖에 없다. 본 논문에서는 주파수 도약 환경에서의 비정상적인 다상 DFT 필터뱅크의 과도기 응답을 분석하고 해당 문제를 해결 할 수 있는 방법을 제시하며 모의실험을 통하여 제안된 방법의 효율성을 보인다.

Filterbanks have been widely used in the field of multi-channel signal processing for their simple efficient implementation architectures. Especially, the polyphase DFT(Discrete Fourier Transform) filterbank is the most preferred filterbank for the uniform spaced multi-channel processing due to its simplicity. In frequency hopped communication systems, however, the use of the polyphase DFT filterbank is limited due to its undesirable transient response from hop-to-hop transitions. In this paper, the transient response of polyphase DFT filterbanks in the hop-to-hop transition was analyzed, and the efficient methods to overcome such a problem was proposed. Simulation results showed that the proposed schemes could resolve this issue efficiently.

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참고문헌

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