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http://dx.doi.org/10.9766/KIMST.2014.17.3.336

A Hybrid ARQ Scheme with Changing the Modulation Order  

Park, Bum-Soo (Surface to Surface Missile PEO, Agency for Defense Development)
Publication Information
Journal of the Korea Institute of Military Science and Technology / v.17, no.3, 2014 , pp. 336-341 More about this Journal
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.
Keywords
Hybrid ARQ; Bit Reliability; QAM Modulation; Forward Error Correction; Incremental Redundancy; Constellation Rearrangement;
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