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Low-Complexity LLR Calculation for Gray-Coded PAM Modulation
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DOI：10.1109/LCOMM.2016.2532880.png)
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摘要
En 中文
Higher-order modulation schemes are employed to improve the spectral efficiency in modern communication systems. However, the conventional Max-Log-MAP symbol-to-bit demapper suffers from a large computational burden. To cope with this problem, this letter proposes a novel log-likelihood ratio computation algorithm for Gray-coded higher-order pulse-amplitude modulation (PAM). The proposed method reduces the order of complexity from O(2(M)) to O(M) without any difference of the LLR values compared with the Max-Log-MAP demapper, where M is the number of bits in one PAM symbol. Moreover, it is also shown that the proposed algorithm achieves superior complexity reduction compared with a recently proposed low-complexity demapper.
Keyword:
Higher-order modulation
log-likelihood ratio
Max-Log-MAP demapper
pulse-amplitude modulation
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期刊
IF:
4.4
论文数:
1.3W
被引数:
2.2W
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