1,969 research outputs found
Physical Uplink Control Channel Design for 5G New Radio
The next generation wireless communication system, 5G, or New Radio (NR) will
provide access to information and sharing of data anywhere, anytime by various
users and applications with diverse multi-dimensional requirements. Physical
Uplink Control Channel (PUCCH), which is mainly utilized to convey Uplink
Control Information (UCI), is a fundamental building component to enable NR
system. Compared to Long Term Evolution (LTE), more flexible PUCCH structure is
specified in NR, aiming to support diverse applications and use cases. This
paper describes the design principles of various NR PUCCH formats and the
underlying physical structures. Further, extensive simulation results are
presented to explain the considerations behind the NR PUCCH design.Comment: 6 pages, 11 figures, accepted in IEEE 5G World Forum 201
Identifying Patch Correctness in Test-Based Program Repair
Test-based automatic program repair has attracted a lot of attention in
recent years. However, the test suites in practice are often too weak to
guarantee correctness and existing approaches often generate a large number of
incorrect patches.
To reduce the number of incorrect patches generated, we propose a novel
approach that heuristically determines the correctness of the generated
patches. The core idea is to exploit the behavior similarity of test case
executions. The passing tests on original and patched programs are likely to
behave similarly while the failing tests on original and patched programs are
likely to behave differently. Also, if two tests exhibit similar runtime
behavior, the two tests are likely to have the same test results. Based on
these observations, we generate new test inputs to enhance the test suites and
use their behavior similarity to determine patch correctness.
Our approach is evaluated on a dataset consisting of 139 patches generated
from existing program repair systems including jGenProg, Nopol, jKali, ACS and
HDRepair. Our approach successfully prevented 56.3\% of the incorrect patches
to be generated, without blocking any correct patches.Comment: ICSE 201
Utility-maximization Resource Allocation for Device-to-Device Communication Underlaying Cellular Networks
Device-to-device(D2D) underlaying communication brings great benefits to the
cellular networks from the improvement of coverage and spectral efficiency at
the expense of complicated transceiver design. With frequency spectrum sharing
mode, the D2D user generates interference to the existing cellular networks
either in downlink or uplink. Thus the resource allocation for D2D pairs should
be designed properly in order to reduce possible interference, in particular
for uplink. In this paper, we introduce a novel bandwidth allocation scheme to
maximize the utilities of both D2D users and cellular users. Since the
allocation problem is strongly NP-hard, we apply a relaxation to the
association indicators. We propose a low-complexity distributed algorithm and
prove the convergence in a static environment. The numerical result shows that
the proposed scheme can significant improve the performance in terms of
utilities.The performance of D2D communications depends on D2D user locations,
the number of D2D users and QoS(Quality of Service) parameters
Defense Expenditure and Economic Growth under External Predation
This paper develops a growth model of a country under a Hobbesian environment with international conflicts where national defense is the only way to prevent external predation. The long run growth path is determined by the equilibrium of a dynamic game with three players, the external predator, the government and the family. The equilibrium growth path has three phases, submissive equilibrium, tolerant equilibrium and full-protected equilibrium. Different defense strategies result in different growth prospects and sustainable growth will endogenously induce adjustment of defense strategies.economic growth; predate; defense expenditure
Cross-correlations mediated by Majorana bound states
We consider the correlated parallel transport through two quantum dots which
are tunnel-coupled to the ends of a semiconductor nanowire where the Majorana
bound states (MBSs) may emerge under proper conditions. In terms of the
cross-correlation of currents, we reveal unusual behaviors originated from the
nonlocal MBSs, including such as the distinct symmetry and antisymmetry of the
spectral density in response to the dot-level modulations, and the vanished
cross correlation occurred when any of the dot-levels is in resonance with the
Majorana zero mode
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