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Signal Shaping for BICM at Low SNR

Erik Agrell (Institutionen för signaler och system, Kommunikationssystem) ; Alex Alvarado
IEEE Transactions on Information Theory (0018-9448). Vol. 59 (2013), 4, p. 2396-2410.
[Artikel, refereegranskad vetenskaplig]

The generalized mutual information (GMI) of bit-interleaved coded modulation (BICM) systems, sometimes called the BICM capacity, is investigated at low signal-to-noise ratio (SNR). The combinations of input alphabet, input distribution, and binary labeling that achieve the Shannon limit are completely characterized. The main conclusion is that a BICM system with probabilistic shaping achieves the Shannon limit at low SNR if and only if it can be represented as a zero-mean linear projection of a hypercube. Hence, probabilistic shaping offers no extra degrees of freedom to optimize the low-SNR BICM-GMI, in addition to what is provided by geometrical shaping. The analytical conclusions are confirmed by numerical results, which also show that for a fixed input alphabet, probabilistic shaping can improve the BICM-GMI in the low and medium SNR range.

Nyckelord: Binary labeling, bit-interleaved coded modulation (BICM), generalizedmutual information (GMI), interleaved coded modulation, wide-band regime, spectral efficiency, hadamard-transform, trellis codes, channel

Denna post skapades 2013-04-26. Senast ändrad 2016-04-28.
CPL Pubid: 176217


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Institutionen för signaler och system, Kommunikationssystem (1900-2017)


Elektroteknik och elektronik

Chalmers infrastruktur