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The wireless channel in mobile communications changes the transmitted signal and thus must be properly modeled. If a multiple-input multiple-output (MIMO) system is considered, the modeling procedure becomes more challenging. In this paper, a novel radio channel model is implemented and validated using measurement data. On one hand, statistical properties of MIMO channels are modeled by geometry-based...
Schedulability analysis for real-time systems has been the subject of prominent research over the past several decades. One of the key foundations of schedulability analysis is an accurate worst case execution time (WCET) measurement for each task. In real-time systems that support preemption, the cache related preemption delay (CRPD) can represent a significant component (up to 44% as documented...
As modern systems are integrating exceeding number of components for better performance and functionality, early full-system simulation tools have become essential for validating complex concurrent system interaction activities. In the past decades, many useful timing-accurate system simulation tools have been developed; however, we find that even for the most efficient techniques, more than 90% of...
This contribution introduces position estimation methods relying on observations of the received power and mean delay obtained in a wideband multi-link scenario. In particular, one- and two-step methods are introduced based on statistical models of the observed link parameters. The proposed methods are tested on data from a wideband measurement campaign. The results show that including observations...
This paper proposes an efficient instruction-oriented approach to improve processor simulation speed while maintaining perfect timing accuracy. Unlike traditional approaches, we simulate only necessary states instruction-by-instruction, instead of updating all states cycle-by-cycle. This approach can be applied to various types of processors, including superscalar processors. The experimental result...
A common practice for reducing synchronization overheads in parallel simulation of a large-scale cluster is to relax synchronization with lengthened synchronous steps. However, as a side effect, simulation accuracy degrades considerably. This paper proposes a novel mechanism that keeps the running speeds of different nodes consistent by synchronizing logical clocks with the wall clock periodically...
The high level of heterogeneity of modern embedded systems forces designers to use different formalisms, thus making reuse and integration very difficult tasks. Reducing such an heterogeneity to a homogeneous implementation is a key solution to allow both simulation and validation of the system. This paper proposes two novel flows to gain a C++ and a SystemC-AMS homogeneous implementations of starting...
Estimation of delay correlations is one of the most challenging problems in SSTA. This is because cell delay depends on a number of factors in a complex manner, which makes complex the estimation of correlations as well. In this paper, we introduce a technique to compute cell-to-cell and path-to-path delay correlations, which allows considering the effects of cell-level input/output edge, input slope...
This paper proposes a new formulation of black-box macromodels for electrically-long scalar interconnects, together with an efficient numerical identification scheme and an optimized SPICE synthesis. The proposed methodology explicitly preserves in the macromodel structure the infinite reflections due to termination mismatch, thus allowing for compact and low-complexity equivalent circuits. Numerical...
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