7,727 research outputs found
A Rate-Splitting Based Bound-Approaching Transmission Scheme for the Two-User Symmetric Gaussian Interference Channel with Common Messages
This paper is concerned with a rate-splitting based transmission strategy for the two-user symmetric Gaussian interference channel that contains common messages only. Each transmitter encodes its common message into multiple layers by multiple codebooks that drawn from one separate code book, and transmits the superposition of the messages corresponding to these layers; each receiver decodes the messages from all layers of the two users successively. Two schemes are proposed for decoding order and optimal power allocation among layers respectively. With the proposed decoding order scheme, the sum-rate can be increased by rate-splitting, especially at the optimal number of rate-splitting, using average power allocation in moderate and weak interference regime. With the two proposed schemes at the receiver and the transmitter respectively, the sum-rate achieves the inner bound of HK without time-sharing. Numerical results show that the proposed optimal power allocation scheme with the proposed decoding order can achieve significant improvement of the performance over equal power allocation, and achieve the sum-rate within two bits per channel use (bits/channel use) of the sum capacity
Proposal of Direct Search for Strongly Bound States of ppbar, npbar Systems with High Intensity and Collective pbar beam
In this letter, we discuss the possibility to look for the direct evidence of
the existence of the ppbar and npbar bound states. Measurement of the single
\gamma ray from the ppbar and npbar systems at rest can directly confirm
whether the X(1860) and X(1835) are the resonances which are strongly coupled
to ppbar. In addition to the neutral candidate, a charged resonance is
also proposed to be searched for in npbar channel. We find that the data from
the Crystal Barrel experiment at LEAR/CERN can be used to confirm the X(1835)
observed by BES Collaboration. The possibility of measuring the
spectrum below 100 MeV at the new experiment with cold high intensity \pbar
beam at GSI is discussed. These new techniques can be used to probe the
structure of the X(1860) and X(1835) in the future.Comment: Accepted by Mod. Phys. Lett.
Exploring the Path to ERP Implementation Success: In Retrospect after Rollout
Whereas numerous studies have examined critical success factors (CSFs) for Enterprise Resource Planning (ERP) implementation, little work has investigated the underlying causal links in the form of conceptual models. This study develops a casual model for ERP implementation success, using a two-stage approach. In Stage one, 27 online publications on ERP implementation in China were collected, and analyzed based on the grounded theory approach, to identify critical events and activities in the process of ERP implementation. In Stage two, a focus group study was conducted to create paths to ERP implementation success in the form of a conceptual model. The 48 critical factors identified in Stage one were mapped onto goals of ERP implementation, following the soft systems methodology (SSM). The result is a model including five high-order concepts: organizational impact, data quality, Normalization of processes, continuous improvement, and fit between business process and ERP systems
Probe the Mixing Parameter for Heavy Neutrinos
Because of the difficulty in detecting final state taus, the mixing parameter
for heavy neutrino is not well studied at current
experiments, compared with other mixing parameters and . In this paper, we focus on a challenging scenario where mixes with
active neutrino of tau flavour only, i.e. and . We derive current constraints on
from the rare -boson decay and electroweak precision data (EWPD). To
forecast the future limits, we also investigate the signal via a Majorana heavy neutrino at future proton-proton
colliders. To suppress the background, both taus are required to decay
leptonically into muons, leading to the final state containing two same sign
muons, at least two jets plus moderate missing energy. The signal and relevant
background processes are simulated at the HL-LHC and SppC/FCC-hh with
center-of-mass energy of 14 TeV and 100 TeV. The preselection and multivariate
analyses based on machine-learning are performed to reduce background. Limits
on are shown for heavy neutrino mass in the range 10-1000 GeV
based on measurements from the rare -boson decay and EWPD, and searches at
the HL-LHC and SppC/FCC-hh with integrated luminosities of 3 and 20 ab.Comment: 9 figures, 4 tables. arXiv admin note: text overlap with
arXiv:2210.1705
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