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Signal Shaping for ...
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Agrell, Erik,1965Chalmers tekniska högskola,Chalmers University of Technology
(författare)
Signal Shaping for BICM at Low SNR
- Artikel/kapitelEngelska2013
Förlag, utgivningsår, omfång ...
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2013
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electronicrdacarrier
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LIBRIS-ID:oai:research.chalmers.se:2f9e24ad-7791-4cf2-9d86-23faa255b6ec
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https://doi.org/10.1109/TIT.2012.2231900DOI
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https://research.chalmers.se/publication/176217URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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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.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Alvarado, Alex,1982University Of Cambridge(Swepub:cth)alexa
(författare)
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Chalmers tekniska högskolaUniversity Of Cambridge
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:IEEE Transactions on Information Theory59:4, s. 2396-24100018-94481557-9654
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