4,281 research outputs found
On Complexity, Energy- and Implementation-Efficiency of Channel Decoders
Future wireless communication systems require efficient and flexible baseband
receivers. Meaningful efficiency metrics are key for design space exploration
to quantify the algorithmic and the implementation complexity of a receiver.
Most of the current established efficiency metrics are based on counting
operations, thus neglecting important issues like data and storage complexity.
In this paper we introduce suitable energy and area efficiency metrics which
resolve the afore-mentioned disadvantages. These are decoded information bit
per energy and throughput per area unit. Efficiency metrics are assessed by
various implementations of turbo decoders, LDPC decoders and convolutional
decoders. New exploration methodologies are presented, which permit an
appropriate benchmarking of implementation efficiency, communications
performance, and flexibility trade-offs. These exploration methodologies are
based on efficiency trajectories rather than a single snapshot metric as done
in state-of-the-art approaches.Comment: Submitted to IEEE Transactions on Communication
Double Resonance in Dalitz Plot of M(pLambda)-M(KLambda) in DISTO Data on p+p rightarrow p+Lambda+K+ at 2.85 GeV
The X(2265) resonance was previously observed in DISTO data of p+p rightarrow
p+Lambda+K+ at 2.85 GeV on an attempt of searching for the kaonic nuclear state
K-pp rightarrow p + Lambda. In the present paper we report an additional
finding, namely, a double resonance type phenomena, not only with a peak at
M(pLambda) = 2265 MeV/c2 but also a broad bump at M(K+ Lambda) ~ 1700 MeV/c2.
This "double-resonance" zone is expressed as XY(2265, 1700). The latter bump
may result from nearby nucleon resonances, typically N*(1710), as well as by
attractive K - Lambda final-state interaction. We point out that this double
resonance XY(2265, 1700) as seen in DISTO at 2.85 GeV cannot be populated
kinematically in a HADES experiment at 3.5 GeV.Comment: 4 pages, 3 figures, HYP2015 conferenc
Migration reversal of soft particles in vertical flows
Non-neutrally buoyant soft particles in vertical microflows are investigated.
We find, soft particles lighter than the liquid migrate to off-center
streamlines in a downward Poiseuille flow (buoyancy-force antiparallel to
flow). In contrast, heavy soft particles migrate to the center of the downward
(and vanishing) Poiseuille flow. A reversal of the flow direction causes in
both cases a reversal of the migration direction, i. e. heavier (lighter)
particles migrate away from (to) the center of a parabolic flow profile.
Non-neutrally buoyant particles migrate also in a linear shear flow across the
parallel streamlines: heavy (light) particles migrate along (antiparallel to)
the local shear gradient. This surprising, flow-dependent migration is
characterized by simulations and analytical calculations for small particle
deformations, confirming our plausible explanation of the effect. This density
dependent migration reversal may be useful for separating particles.Comment: 8 pages, 7 figure
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