Soft combining for hybrid ARQ |
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Authors: | Holland I.D. Zepernick H.-J. Caldera M. |
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Affiliation: | Inst. for Telecommun. Res., Univ. of South Australia, Mawson Lakes, SA, Australia; |
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Abstract: | A soft combining approach utilising symbol-by-symbol maximum a posteriori probability decoding is proposed for hybrid automatic repeat request schemes. In comparison to an existing soft combining approach, significant reductions in post-decoding bit error rate can be obtained without sacrificing the throughput efficiency. This is achieved with the proposed method by accumulating the signal-to-noise ratio at the channel output on each additional retransmission, for use in calculating extrinsic log-likelihood ratios on subsequent decoding attempts. |
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