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This paper introduces a novel approach for isolating the failing paths for a fabricated chip. Failing paths are defined as the paths violating the timing constraint at the post-silicon stage, in the presence of process variations. To achieve this goal, a framework is suggested in which, first, a large number of statistically critical paths are extracted at the pre-silicon stage. These paths are those...
We propose a novel approach to calculate the conduction velocity (CV) of the uterine contraction bursts in magnetomyogram (MMG) signals measured using a multichannel SQUID array. For this purpose, we partition the sensor coordinates into four different quadrants and identify the contractile bursts using a previously proposed Hilbert-wavelet transform approach. If contractile burst is identified in...
Power supply noise is very important in delay testing. Excessive noise can cause circuit delay increases that lead to test overkill. Test patterns that are too quiet can lead to test escapes. In this work, we introduce a realistic low cost delay test compaction flow that guardbands circuit delay during test using a sequence of estimation metrics. Significant reductions in CPU time are demonstrated...
The paper introduces the deterministic model and stochastic model of the nonlinear and asymmetric time-delay gene transcriptional regulation system, and researches the properties of stochastic system with the delay time by computational modeling. With the delay time increasing, it is found that the peak of probability distribution in high steady states is increased, and the peak of probability distribution...
In this paper, we discuss how link stability and number of mobile nodes impact on end-to-end delay in mobile ad hoc network (MANET). We find that their relationship shows differently when there is a path between any arbitrary source-destination node pair in the network or not. Meanwhile, two models are proposed respectively based on the Cox proportional hazards model to reveal the relationship. It...
This paper presents an analytical method for accurate estimation of delay distributions for circuits under (within-die) process variations. The technique is applied for the circuit delay calculation when considering the effect of channel length variation. In the proposed model, instead of obtaining the exact delay distribution profile, statistically important parameters including mean and variance...
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...
Series of queues are suitable performance models for a variety of communication network components and access technologies, but the usual assumption of independent service times at different nodes is critical. We consider delays in a series of queues with identical service times at each network node where for each customer the service time at the first node is a random variable and the successive...
The objective in Data Grids is to reduce access and file (replica) transfer latencies, as well as to avoid single site congestion by the numerous requesters. To facilitate access and transfer of the data, the files of the Data Grid are distributed across the multiple sites. The effectiveness of a replica selection strategy in data grids depends on its ability to serve the requirement posed by the...
A stochastic multiple-input multiple-output (MIMO) wireless channel model is discussed and its implementation scheme is proposed. An improved shaping-filter method, which can eliminate correlation of different paths by adding a random phase-shift and obtain the tap coefficient by using a double interpolation method, is proposed to simulate the MIMO fading channel. Simulation of 3GPP standard model...
We have presented a novel design methodology to model complex intensive data-parallel applications. The modeling is carried out using the UML graphical language and the MARTE standard. Afterwards, automatic code generation can be carried out via MDE tools and technologies. Finally the code can be synthesized and implemented on a target FPGA. We have presented an example of this process, by building...
Event handling is a management mechanism that provides means for the network to react on changes in the network conditions or performance. In the construction of a clean-slate management architecture, we consider this as a main building block. This paper proposes a fully distributed event distribution in a fully distributed environment: differently from existing works, no configuration is required...
A low-complexity hardware implementation method is proposed for discrete-time frequency-selective Rayleigh fading channels. The proposed method first employs the sum-of-sinusoids method to generate multiple independent flat fading channel responses, then utilizes a simple weight-delay-sum filtering method to incorporate the fractionally-delayed multipath rays into inter-tap correlated tap gains. It...
A stochastic 2times2 MIMO wideband channel modelling method is presented. This channel model uses tapped delay lines (TDL) to model the subchannels and a single channel spatial correlation matrix to introduce the statistical dependence. This model represents a novel simplification with respect to other wideband MIMO models. The channel models obtained from this method are accurate and computationally...
Delay measurement is the key to TDOA technology. This article first introduced the PN sequence, and then summarized the m sequence which is commonly used and its application in delay measurement, finally made a simulation by Matlab and discussed the influence of noise and the period of m sequence in different situation.
This paper presents a stochastic 2times2 MIMO wideband channel modelling method that uses tapped delay lines (TDL) and a single channel spatial correlation matrix that represents a novel simplification with respect to other wideband MIMO models. The resulting models are accurate but also easy to implement and computationally efficient. Using this method, outdoor-indoor channel models are obtained...
Statistical static timing analysis deals with the increasing variations in manufacturing processes to reduce the pessimism in the worst case timing analysis. Because of the correlation between delays of circuit components, timing model generation and hierarchical timing analysis face more challenges than in static timing analysis. In this paper, a novel method to generate timing models for combinational...
This paper considers a general approach for the computation of all functional characteristics of a probabilistic wireless channel model using a bidirectional parametric description. It is shown that under mild conditions the WSSUS property is valid for these models and explicit relations are derived for the computation of the time-frequency autocorrelation from which one can easily derive the Doppler...
This paper studies the performance of dual-pulse transmitted-reference (TR) ultra wideband (UWB) systems in presence of multi-access interference (MAI). We derive an analytical expression of the channel-averaged signal-to-interference ratio (SIR) for a TR UWB receiver in two asynchronous scenarios, based on random time-hopping (TH) codes. The analytical results and numerical results are presented...
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