The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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New Hierarchical Modulation Scheme Using a Constellation Rotation Method

성상회전 변조기법을 이용한 새로운 계층변조 기법

  • Kim, Hojun (Chonnam N. University Department of Electronics and Computer Engineering) ;
  • Shang, Yulong (Chonnam N. University Department of Electronics and Computer Engineering) ;
  • Park, Jaehyung (Chonnam N. University Department of Electronics and Computer Engineering) ;
  • Jung, Taejin (Chonnam N. University Department of Electronics and Computer Engineering)
  • Received : 2015.10.03
  • Accepted : 2015.12.23
  • Published : 2016.01.31
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Abstract

In this paper, we propose a new hierarchical modulation scheme for DVB-NGH to improve the performance of LP (Low-Parity) signals by applying a conventional constellation-rotation method to the LP signals without virtually a loss of performance of a HP (High-Parity) signals. The improvement of the LP signals is mainly due to the increased divesity gain caused by the constellation-rotation method which barely affect the performance of the HP signals. For the new scheme, we also propose a hardware-efficient ML (Maximum-Likelihood) detection algorithm that first decodes the HP signals by using a conventional HP receiver, and then simply decodes the precoded LP signals based on the pre-detected HP signals.

본 논문은 DVB-NGH 내 계층(HP : High Priority) 신호와 향상 계층(LP : Low Priority) 신호로 구성된 계층변조 기법에서 LP 신호의 성능저하 문제를 개선하기 위해 LP 신호에 성상회전(Constellation-Rotation) 변조기법을 적용한 새로운 계층변조 기법을 제안한다. 제안된 기법은 연속된 LP 신호들에 대하여 기존의 성상회전 선부호기를 적용하여 수신단에서 향상된 다이버시티 이득을 획득으로 성능 향상이 발생하며, 더불어 HP 신호들의 성능 저하는 거의 발생하지 않는다. 본 논문에서는 또한 제안된 새로운 계층변조 기법에 대한 수신 방법으로 HP 복조는 기존의 HP 수신기를 사용하고 LP 신호에 대하여만 CR 기반의 ML 복조를 수행하는 새로운 저 복잡도 수신 방법도 제시한다.

Keywords

References

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