3,149 research outputs found
Accelerating AdS black holes as the holographic heat engines in a benchmarking scheme
We investigate the properties of holographic heat engines with an uncharged
accelerating non-rotating AdS black hole as the working substance in a
benchmarking scheme. We find that the efficiencies of the black hole heat
engines can be influenced by both the size of the benchmark circular cycle and
the cosmic string tension as a thermodynamic variable. In general, the
efficiency can be increased by enlarging the cycle, but is still constrained by
a universal bound as expected. A cross-comparison of the
efficiencies of the accelerating black hole heat engines and Schwarzschild-AdS
black hole heat engines suggests that the acceleration also increases the
efficiency although the amount of increase is not remarkable.Comment: 13 pages,4 figure
A Novel Interleaving Scheme for Polar Codes
It's known that the bit errors of polar codes with successive cancellation
(SC) decoding are coupled. We call the coupled information bits the correlated
bits. In this paper, concatenation schemes are studied for polar codes (as
inner codes) and LDPC codes (as outer codes). In a conventional concatenation
scheme, to achieve a better BER performance, one can divide all bits in a
LDPC block into polar blocks to completely de-correlate the possible
coupled errors. In this paper, we propose a novel interleaving scheme between a
LDPC code and a polar code which breaks the correlation of the errors among the
correlated bits. This interleaving scheme still keeps the simple SC decoding of
polar codes while achieves a comparable BER performance at a much smaller delay
compared with a -block delay scheme
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