Optimal Alphabets and Binary Labelings for BICM at Low SNR

  title={Optimal Alphabets and Binary Labelings for BICM at Low SNR},
  author={Erik Agrell and Alex Alvarado},
  journal={IEEE Transactions on Information Theory},
Optimal binary labelings, input distributions, and input alphabets are analyzed for the so-called bit-interleaved coded modulation (BICM) capacity, paying special attention to the low signal-to-noise ratio (SNR) regime. For 8-ary pulse amplitude modulation (PAM) and for 0.75 bit/symbol, the folded binary code results in a higher capacity than the binary reflected Gray code (BRGC) and the natural binary code (NBC). The 1 dB gap between the additive white Gaussian noise (AWGN) capacity and the… CONTINUE READING
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