Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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A Hybrid ARQ Scheme with Changing the Modulation Order

변조 차수 변경을 통한 하이브리드 자동 재전송 기법

  • Park, Bum-Soo (Surface to Surface Missile PEO, Agency for Defense Development)
  • 박범수 (국방과학연구소 대지유도무기체계단)
  • Received : 2013.10.04
  • Accepted : 2014.04.11
  • Published : 2014.06.05
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Abstract

When using a higher-order modulation scheme, there are variations in bit-reliability depending on the bit position in a modulation symbol. Variations of bit-reliability in the codeword block lower the decoding performance. Also, the decoding performance increases as the sum of the bit-reliabilities in the codeword block increases. This paper presents a novel hybrid automatic repeat request scheme that increases the sum of the reliabilities of the transmitted bits by lowering the modulation order, and decreases the variations of bit-reliability in the codeword block by preferentially retransmitting bits with low reliability. The proposed scheme outperforms the constellation rearrangement scheme. Furthermore, the proposed scheme also provides a good solution in cases where the size of the retransmission block is smaller than the size of the initial transmission block.

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References

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