Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Compressed Shaping: Concept and FPGA Demonstration   Probabilistic shaping (PS) has been widely studied and applied to optical
fiber communications. The encoder of PS expends the number of bit slots and
controls the probability distribution of channel input symbols. Not only
studies focused on PS but also most works on optical fiber communications have
assumed source uniformity (i.e. equal probability of marks and spaces) so far.
On the other hand, the source information is in general nonuniform, unless
bit-scrambling or other source coding techniques to balance the bit probability
is performed. Interestingly, one can exploit the source nonuniformity to reduce
the entropy of the channel input symbols with the PS encoder, which leads to
smaller required signal-to-noise ratio at a given input logic rate. This
benefit is equivalent to a combination of data compression and PS, and thus we
call this technique compressed shaping. In this work, we explain its
theoretical background in detail, and verify the concept by both numerical
simulation and a field programmable gate array (FPGA) implementation of such a
system. In particular, we find that compressed shaping can reduce power
consumption in forward error correction decoding by up to 90% in nonuniform
source cases. The additional hardware resources required for compressed shaping
are not significant compared with forward error correction coding, and an error
insertion test is successfully demonstrated with the FPGA.

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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg