University of Notre Dame

About: University of Notre Dame is a education organization based out in Notre Dame, Indiana, United States. It is known for research contribution in the topics: Population & Context (language use). The organization has 22238 authors who have published 55201 publications receiving 2032925 citations. The organization is also known as: University of Notre Dame du Lac & University of Notre Dame, South Bend.

Teacher Influences on Students' Attachment to School:

Abstract: Research has shown that students who like school have higher academic achievement and a lower incidence of disciplinary problems, absenteeism, truancy, and dropping out of school than do those who ...

Coordinated Multipoint Joint Transmission in Heterogeneous Networks

Abstract: Motivated by the ongoing discussion on coordinated multipoint in wireless cellular standard bodies, this paper considers the problem of base station cooperation in the downlink of heterogeneous cellular networks. The focus of this paper is the joint transmission scenario, where an ideal backhaul network allows a set of randomly located base stations, possibly belonging to different network tiers, to jointly transmit data, to mitigate intercell interference and hence improve coverage and spectral efficiency. Using tools from stochastic geometry, an integral expression for the network coverage probability is derived in the scenario where the typical user located at an arbitrary location, i.e., the general user, receives data from a pool of base stations that are selected based on their average received power levels. An expression for the coverage probability is also derived for the typical user located at the point equidistant from three base stations, which we refer to as the worst case user. In the special case where cooperation is limited to two base stations, numerical evaluations illustrate absolute gains in coverage probability of up to 17% for the general user and 24% for the worst case user compared with the noncooperative case. It is also shown that no diversity gain is achieved using noncoherent joint transmission, whereas full diversity gain can be achieved at the receiver if the transmitting base stations have channel state information.

A Class of Group-Structured LDPC Codes

Abstract: 1 This work was supported by NSF grant 99-96222 Abstract A class of graphs is designed using subgroups of the multiplicative group of a prime field GF(p) Instances where (p-1) is divisible by 3 and 5 are used to construct quasi-cyclic LDPC codes with bit degree 3 and parity degree 5, among them a [155,64,20] code While the girth of a graph in this class cannot be greater than twelve, for many practical lengths the graphs have a relatively large girth and a lowdensity of short cycles Simulation studies show that at short to moderate lengths these codes’ performance meets or surpasses that of randomly generated regular (3,5) LDPC codes when used with sum-product algorithm decoders