1,721,066 research outputs found
On the Performance of Ad Hoc Networks with Multiuser Detection, Rate Control and Hybrid ARQ
Full text linkIn this paper, we present a novel analytical framework for the study of a multiple access scheme for an ad hoc code division multiple access (CDMA) network with hybrid automatic repeat request (HARQ) error control and matched filter linear successive interference cancellation receivers. Unlike most prior work on Multi-User Detection (MUD), we directly address networking issues. In particular, we develop an approach based on renewal and semi-Markov processes, that accurately accounts for the statistical dependencies between interference, coding rate, and performance in a multiple access system. We show that our approximate approach can accurately predict throughput and failure rate values, and present results for a specific system, providing useful insight on issues related to the use of HARQ error control and MUD receivers in CDMA ad hoc networks
Children's comprehension and production of idioms: the role of context and familiarity.
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The semantic structure of vision verbs: a psycholinguistic investigation of Italian
No full textThe aim of the present study was to investigate the semantic dimensions
that contribute to the mental representation of vision verbs in Italian. In
Experiment 1, a group of experts (psychology faculty members) was asked
to list the semantic attributes necessary for describing a set of Italian vision
verbs (Phase 1) and a group of students rated the extent to which each of
these attributes was appropriate to characterise these verbs (Phase 2). In
Experiment 2, the conceptual organisation of vision verbs was assessed
through Multidimensional Scaling (MDS) using direct judgements of
pairwise similarity between vision verbs (e.g., ``vedere± guardare’ ’ ). The
results show that six of the attributes generated in Phase 1 are useful for
describing the pattern of similarity ratings obtained in Experiment 2,
namely attention, certainty, cognitive content, control, duration, and intentionality
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