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This paper presents asynchronous sub-sampling techniques to measure delay mismatch of clock and data lanes in high-speed serial network-on-chip (NoC) links. The techniques allow the use of low quality sampling clocks to reduce test hardware overhead for integration into complex MPSoCs with multiple NoC links. It enables compensation of delay variations to realize high-speed NoC links with sufficient...
In this work we describe a methodology to estimate one-way packet loss from IPFIX or NetFlow flow records collected at two monitoring points. The proposed method does not require tight synchronization between the two monitoring points, nor it relies upon external routing information. It can run online or offline, and can work on legacy IPFIX/NetFlow traces which were not collected for the specific...
Service-based systems (SBSs) are distributed systems which have many advantages, including rapid composition of services for distributed applications. In these systems, various capabilities are provided by service providers as services interconnected by networks. It is important for users of SBSs to have confidence in the trustworthiness of service providers. Existing approaches to trust estimation...
Congestion control is critical for the provisioning of quality of services (QoS) over dedicated short range communications (DSRC) vehicle networks for road safety applications. In this paper we propose a congestion control method for DSRC vehicle networks at road intersection, with the aims of providing high availability and low latency channels for high priority emergency safety applications while...
By analyzing the periodicity of autocorrelation functions (ACF) and average magnitude difference functions (AMDF), we present a pitch tracking method based on correlations of mixing ACF & AMDF algorithms. First, we calculate the normalized autocorrelation functions and normalized average magnitude difference functions, and then select a reasonable interpolation parameter from the experiments,...
In this study, a delay between the start of electromyogram (EMG) signals and the start of actual human motions which is called Electro Mechanical Delay (EMD) is used in order to eliminate a delay such as a mechanical delay and a communication delay in manipulating systems. The man-machine interface to accomplish zero-phase tracking eliminating some delay is proposed in this paper. This interface consists...
MIMO-OFDM technology make full use of space and spectrum resources, it can exponentially increase the channel capacity, so it is one of the core technology of next generation mobile communication systems. In order to estimate the time domain (or frequency domain) response of MIMO-OFDM systems fast and accurately, the traditional SVD estimator is modified in this paper. To reduce the time to compute...
It is a significant application of wireless sensor networks to monitor a mobile target. Multiple sensor nodes cooperate to get an accurate estimation of the signal of the mobile target. Spatial correlation, induced by the spatial distribution of target and sensor nodes, is an inherent phenomenon of wireless sensor networks. This correlation causes redundancy amongst nodes which create redundant information...
This paper presents a novel low complexity high resolution timing and Doppler acquisition algorithm for direct-sequence code division multiple access (DS-CDMA) systems. We apply the two-dimensional unitary estimation of signal parameters via rotational invariant techniques (ESPRIT) algorithm to the joint delay and Doppler acquisition task in multipath environments. Additionally, we use the advantageous...
Extensive analysis of channel measurement data for the investigation of new channel models plays a fundamental role in designing and evaluating todays wireless communication systems. Besides the knowledge of the parameters and their distribution functions, the cross correlation between them is of great interest and can be exploited for more sophisticated channel simulations. In this contribution the...
In this paper, we identify quality dimensions which are relevant for speech communication services, such as mobile telephony or Voice-over-IP. These include dimensions perceived when listening to degraded speech, talking against echoes, double-talk capabilities, interacting with delay, conversing over channels with time-varying characteristics, and service-related dimensions experienced during speech...
One of the most interesting applications of single — sided Quality of Experience (QoE) metrics is their use in improving the quality of the service, as perceived by the user. This can be done either at the application level — by for example changing the encoding in use, or the level of error correction applied — or at the network level, for instance by choosing a different DiffServ marking strategy,...
We evaluate the performance of a dual-adaptive feedforward control architecture applied to the raster scan of a piezo-based positioning system. In previous work [1], we introduced the adaptive-delay algorithm that improved the tracking performance of the feedforward plant-injection architecture. The key benefit of the adaptive-delay algorithm is the adaptation calculation that does not require knowledge...
TCP (Transmission Control Protocol) is the dominant end to end transport protocol of the Internet, with a wide range of applications including Web, mail or peer to peer traffic. The TCP stack implements a “backlog queue” for new connections, which contains an entry for every client's connection setup received by the server. If the TCP handshake is not completed, the pending half-open connection stays...
In previous work, it has been observed that the specular and the diffuse component are linked in the angular domain. The idea of adding a diffuse component to each specular cluster has been proposed to model the specular-diffuse channel. In this paper, an approach is proposed to treat the specular and the diffuse measurement data simultaneously, with a clustering algorithm that is applied jointly...
This paper presents a methodology to reduce the impact of double faults in a circuit by constraining the placement of its standard cells. A fault injection emulation platform is used to analyze the single-event-induced charge sharing effect in every pair of nodes. Based on the sensitivity of each pair, guidelines are set in a commercial standard cell placement by using constraints. Results show that...
Negative Bias Temperature Instability is a serious reliability concerns for modern p-MOSFETs with Effective Oxide Thickness less than 2nm. This reliability problem can severely affect the device performance and limit the lifetime of the device. This paper is focusing on the safe operating condition and lifetime estimation of the p-MOSFET device with regard to NBTI effects. To explore the variation...
The latest wireless communication systems focus on developing MIMO-OFDM systems that allow the transmission of very high data rates in fading environments. We can optimize these systems even further by setting the modulation and coding adaptively according to the channel conditions, and by using sub-carrier frequency and power allocation techniques. The overall system performance depends on the accuracy...
In high frequency FPGAs with technology scale shrinking and threshold voltage value decreasing and based on existing large numbers of unused resources, leakage power has a considerable contribution in total power consumption. On the other hand, process variation, as an important challenge in nano-scale technologies, has a great impact on leakage power of FPGAs. Reconfigurability of FPGAs makes an...
The deep quasiperiodic variations in the part of frequency dependence of amplitude of reflections from layer Es observed by Kazan ionosonde was discovered. The analysis of height location of traces in an ionogram has shown that beatings arise because of interference between o- and x-modes. For an explanation of such interaction details a modeling is performed on the basis of calculations of coefficient...
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