237 research outputs found
Low-Density Code-Domain NOMA: Better Be Regular
A closed-form analytical expression is derived for the limiting empirical
squared singular value density of a spreading (signature) matrix corresponding
to sparse low-density code-domain (LDCD) non-orthogonal multiple-access (NOMA)
with regular random user-resource allocation. The derivation relies on
associating the spreading matrix with the adjacency matrix of a large
semiregular bipartite graph. For a simple repetition-based sparse spreading
scheme, the result directly follows from a rigorous analysis of spectral
measures of infinite graphs. Turning to random (sparse) binary spreading, we
harness the cavity method from statistical physics, and show that the limiting
spectral density coincides in both cases. Next, we use this density to compute
the normalized input-output mutual information of the underlying vector channel
in the large-system limit. The latter may be interpreted as the achievable
total throughput per dimension with optimum processing in a corresponding
multiple-access channel setting or, alternatively, in a fully-symmetric
broadcast channel setting with full decoding capabilities at each receiver.
Surprisingly, the total throughput of regular LDCD-NOMA is found to be not only
superior to that achieved with irregular user-resource allocation, but also to
the total throughput of dense randomly-spread NOMA, for which optimum
processing is computationally intractable. In contrast, the superior
performance of regular LDCD-NOMA can be potentially achieved with a feasible
message-passing algorithm. This observation may advocate employing regular,
rather than irregular, LDCD-NOMA in 5G cellular physical layer design.Comment: Accepted for publication in the IEEE International Symposium on
Information Theory (ISIT), June 201
Joint Interference Alignment and Bi-Directional Scheduling for MIMO Two-Way Multi-Link Networks
By means of the emerging technique of dynamic Time Division Duplex (TDD), the
switching point between uplink and downlink transmissions can be optimized
across a multi-cell system in order to reduce the impact of inter-cell
interference. It has been recently recognized that optimizing also the order in
which uplink and downlink transmissions, or more generally the two directions
of a two-way link, are scheduled can lead to significant benefits in terms of
interference reduction. In this work, the optimization of bi-directional
scheduling is investigated in conjunction with the design of linear precoding
and equalization for a general multi-link MIMO two-way system. A simple
algorithm is proposed that performs the joint optimization of the ordering of
the transmissions in the two directions of the two-way links and of the linear
transceivers, with the aim of minimizing the interference leakage power.
Numerical results demonstrate the effectiveness of the proposed strategy.Comment: To be presented at ICC 2015, 6 pages, 7 figure
Quantum correlations of twophoton polarization states in the parametric down-conversion process
We consider correlation properties of twophoton polarization states in the
parametric down-conversion process. In our description of polarization states
we take into account the simultaneous presence of colored and white noise in
the density matrix. Within the considered model we study the dependence of the
von Neumann entropy on the noise amount in the system and derive the
separability condition for the density matrix of twophoton polarization state,
using Perec-Horodecki criterion and majorization criterion. Then the dependence
of the Bell operator (in CHSH form) on noise is studied. As a result, we give a
condition for determining the presence of quantum correlation states in
experimental measurements of the Bell operator. Finally, we compare our
calculations with experimental data [doi:10.1103/PhysRevA.73.062110] and give a
noise amount estimation in the photon polarization state considered there.Comment: 10 pages, 7 figures; corrected typo
Cooperative Multi-Cell Networks: Impact of Limited-Capacity Backhaul and Inter-Users Links
Cooperative technology is expected to have a great impact on the performance
of cellular or, more generally, infrastructure networks. Both multicell
processing (cooperation among base stations) and relaying (cooperation at the
user level) are currently being investigated. In this presentation, recent
results regarding the performance of multicell processing and user cooperation
under the assumption of limited-capacity interbase station and inter-user
links, respectively, are reviewed. The survey focuses on related results
derived for non-fading uplink and downlink channels of simple cellular system
models. The analytical treatment, facilitated by these simple setups, enhances
the insight into the limitations imposed by limited-capacity constraints on the
gains achievable by cooperative techniques
Throughput Scaling of Wireless Networks With Random Connections
This work studies the throughput scaling laws of ad hoc wireless networks in
the limit of a large number of nodes. A random connections model is assumed in
which the channel connections between the nodes are drawn independently from a
common distribution. Transmitting nodes are subject to an on-off strategy, and
receiving nodes employ conventional single-user decoding. The following results
are proven:
1) For a class of connection models with finite mean and variance, the
throughput scaling is upper-bounded by for single-hop schemes, and
for two-hop (and multihop) schemes.
2) The throughput scaling is achievable for a specific
connection model by a two-hop opportunistic relaying scheme, which employs
full, but only local channel state information (CSI) at the receivers, and
partial CSI at the transmitters.
3) By relaxing the constraints of finite mean and variance of the connection
model, linear throughput scaling is achievable with Pareto-type
fading models.Comment: 13 pages, 4 figures, To appear in IEEE Transactions on Information
Theor
Bayesian Active Meta-Learning for Reliable and Efficient AI-Based Demodulation
Two of the main principles underlying the life cycle of an artificial
intelligence (AI) module in communication networks are adaptation and
monitoring. Adaptation refers to the need to adjust the operation of an AI
module depending on the current conditions; while monitoring requires measures
of the reliability of an AI module's decisions. Classical frequentist learning
methods for the design of AI modules fall short on both counts of adaptation
and monitoring, catering to one-off training and providing overconfident
decisions. This paper proposes a solution to address both challenges by
integrating meta-learning with Bayesian learning. As a specific use case, the
problems of demodulation and equalization over a fading channel based on the
availability of few pilots are studied. Meta-learning processes pilot
information from multiple frames in order to extract useful shared properties
of effective demodulators across frames. The resulting trained demodulators are
demonstrated, via experiments, to offer better calibrated soft decisions, at
the computational cost of running an ensemble of networks at run time. The
capacity to quantify uncertainty in the model parameter space is further
leveraged by extending Bayesian meta-learning to an active setting. In it, the
designer can select in a sequential fashion channel conditions under which to
generate data for meta-learning from a channel simulator. Bayesian active
meta-learning is seen in experiments to significantly reduce the number of
frames required to obtain efficient adaptation procedure for new frames.Comment: To appear in IEEE Transactions on Signal Processin
Calibrating AI Models for Few-Shot Demodulation via Conformal Prediction
AI tools can be useful to address model deficits in the design of
communication systems. However, conventional learning-based AI algorithms yield
poorly calibrated decisions, unabling to quantify their outputs uncertainty.
While Bayesian learning can enhance calibration by capturing epistemic
uncertainty caused by limited data availability, formal calibration guarantees
only hold under strong assumptions about the ground-truth, unknown, data
generation mechanism. We propose to leverage the conformal prediction framework
to obtain data-driven set predictions whose calibration properties hold
irrespective of the data distribution. Specifically, we investigate the design
of baseband demodulators in the presence of hard-to-model nonlinearities such
as hardware imperfections, and propose set-based demodulators based on
conformal prediction. Numerical results confirm the theoretical validity of the
proposed demodulators, and bring insights into their average prediction set
size efficiency.Comment: Submitted for a conference publicatio
Educational needs of midwife alumni work in health care centers
Abstract
Aims: Determination of educational needs is the first step in educational planning and the first factor of ensuring
the quality and efficacy of education process. Midwives’ sufficient knowledge and improvement of their
decision-making will lead to performance progress. The aim of this study was determining the educational needs
of midwives working in hospitals and healthcare centers of Chaharmahal & Bakhtiari province.
Methods: This cross-sectional study was performed on 280 midwives and 50 healthcare center authorities of
hospitals and healthcare centers of Chaharmahal & Bakhtiari who were selected by census sampling method in
2009. Data was collected by a researcher-made questionnaire containing three sections of demographic
characteristics, educational needs related to their specialty or general domains and priority in educational needs.
Data were analyzed by descriptive statistics and Chi-square, student T-test and one-way ANOVA using SPSS 15
software.
Results: There wasn’t significant difference in the average scores of educational needs in specific and general
domains from authorities and midwives’ point of view (p>0.05). There was a significant relationship between
the average score of educational needs and work place in obstetrics (p=0.002), maternal and child health
(p=0.038) and neonatal (p=0.025) domains. There was a significant relationship between the average score of
educational needs and the academic level of education in general domains (p=0.025).
Conclusion: Holding educational classes of English, use of Information Technology (IT) in obstetrics,
resuscitation, research methodology, religious and legal commandments, abnormal uterine bleeding,
hypertensive disorders, neonatal medical treatment and common gynecologic infections seems essential as
educational priorities.
Keywords: Midwife, Hea
Utilizing the Boston Syncope Observation Management Pathway to Reduce Hospital Admission and Decrease Adverse Outcomes
Introduction: In an age of increasing scrutiny of each hospital admission, emergency department (ED) observation has been identified as a low-cost alternative. Prior studies have shown admission rates for syncope in the United States to be as high as 70%. However, the safety and utility of substituting ED observation unit (EDOU) syncope management has not been well studied. The objective of this study was to evaluate the safety of EDOU for the management of patients presenting to the ED with syncope and its efficacy in reducing hospital admissions.
Methods: This was a prospective before-and-after cohort study of consecutive patients presenting with syncope who were seen in an urban ED and were either admitted to the hospital, discharged, or placed in the EDOU. We first performed an observation study of syncope management and then implemented an ED observation-based management pathway. We identified critical interventions and 30-day outcomes. We compared proportions of admissions and adverse events rates with a chisquared or Fisher’s exact test.
Results: In the “before” phase, 570 patients were enrolled, with 334 (59%) admitted and 27 (5%) placed in the EDOU; 3% of patients discharged from the ED had critical interventions within 30 days and 10% returned. After the management pathway was introduced, 489 patients were enrolled; 34% (p\u3c0.001) of pathway patients were admitted while 20% were placed in the EDOU; 3% (p=0.99) of discharged patients had critical interventions at 30 days and 3% returned (p=0.001).
Conclusion: A focused syncope management pathway effectively reduces hospital admissions and adverse events following discharge and returns to the ED. [West J Emerg Med. 2019;20(2)250–255.
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