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It is commonly understood that, to cast light into a state with sub-Poissonian statistics, a strong optical nonlinearity is needed. The most common examples are resonance fluorescence of a two-level system, or a Kerr medium where the Kerr energy per photon U is much larger than the optical linewidth κ. In both cases, a single-photon nonlinearity is realized, whereby the presence of a single photon...
This paper proposes an efficient ordering calculation method employing frequency correlation in multiuser multiple-input multiple-output orthogonal frequency division multiplexing (MU-MIMO-OFDM) Tomlinson Harashima Precoding (THP). Although the ordering process is effective to improve the transmission performance of THP, it requires a large amount of computational effort due to sub-carrier-based operation...
A minimum mean square error estimation (MMSE) using a virtual pilot channel estimation scheme was proposed by our researchers for improving the error performance of the IEEE 802.11p. However, compared to the STA channel estimation scheme, the MMSE scheme cannot provide an acceptable error performance in a low SNR region. To alleviate this, we propose an adaptive channel estimation scheme, which selectively...
Proliferation of mobile digital devices has posed major challenges for design and implementation of Wireless Local Area Networks (WLANs), leading to stringent quality of service (QoS) requirements. Extreme burstiness and correlation characteristics of multimedia traffics generated by digital devices require accurate modelling and analysis to provide satisfactory end user experience. Most existing...
We consider a real-time status update system consisting of a source-destination network. A stochastic process is observed at the source, and samples, so called status updates, are extracted at random time instances, and delivered to the destination. In this paper, we expand the concept of information ageing by introducing the Cost of Update Delay (CoUD) metric to characterize the cost of having stale...
Prediction of the behavior of the grouped users in the future is a meaningful research question. In this paper, we take the transit users as an example to introduce the phase space reconstruction method and use the massive sequence data to model the large-scale system with a dynamic evolution model. At the same time, considering the shortcomings of the general prediction method in large data set,...
Effective mutual interference suppression methods are proposed for terrestrial ultra-wideband systems of mediumwave band. Navigation signals modulated with data provide higher accuracy, satellite and terrestrial systems integration. Such long range systems characterized by powerful mutual interferences.
Using a unique dataset collected from a large classified ads website in China, we investigate the future purchase probability of coupon redeemers, particularly how it differs between users who redeem coupons right after the coupon drop and those who delay redemptions. We find that, coupon redeemers have a higher probability to make future purchases than non-redeemers no matter on which day the coupon...
A new method for generation of binary pseudorandom sequences (BPR-sequences) with quasi-perfect periodic and inverse periodic autocorrelation has been suggested for applications in radars. The method is based upon a modified discrete multi-dimensional chaotic map with two delays. Various BPR-sequences generated according to the method suggested has been analyzed using computer simulation. Spectrums...
This paper presents a technique for detection of selected targets in the context of ultrawideband noise radar. The technique applies to scenarios where targets can be modeled as having a few predominant scatterers, such as some made man-made targets. The basic idea is to change the signal used as reference for detection in such a way that it is adapted to the predominant scatterers of the targets...
As the proportion of rail traffic in urban public transport was getting higher and higher, people put forward more requirements on service quality of rail transit. A train control system that served as brain and nerves of the urban rail transit system decided whether the train is able to run safely and constantly on schedule with a high density, which was a key influencing factor for the urban rail...
Speed binning of system-on-chips (SoCs) using conventional $F_{\mathrm {max}}$ test requires application of complex functional test patterns. Functional workload-based speed binning techniques incur high test-cost in terms of long test-time and complexity in functional test generation, and require high-end automatic test equipment. In this paper, we propose a novel speed binning flow that uses path...
In recent years, shrinking size in integrated circuits has imposed a big challenge in maintaining the reliability in conventional computing. Stochastic computing has been seen as a reliable, low-cost, and low-power alternative to overcome such issues. Stochastic Computing (SC) computes data in the form of bit streams of 1s and 0s. Therefore, SC outperforms conventional computing in terms of tolerance...
The problem of determining the sensitization probability of a path by a test vector is investigated. It is important when testing for delay defects due to process variations. An algorithm is presented which has high accuracy. Gate delays are modeled as probability mass functions, and novel operations are introduced that take into consideration circuit reconvergences and path correlations. Experimental...
A calibration technique for timing skew of parallel time-interleaved analog-to-digital converters is presented. The proposed method detects the sampling time errors from the output samples and corrects them using programmable delay cells. A theoretical background of the proposed method is supplied and the approach is analyzed for two-, three-, and four-channel architectures before being extended to...
The article deals with the analytic description of all types of transient gas dynamic processes used at mining sites which allowed us to obtain a generalized expression for the transfer functions of ventilation facilities subject to delay and describe the dynamic properties of the mine sites during different ventilation modes. It was established experimentally that the linear zed dynamic characteristics...
Both ring-oscillator based clocks and bundled-data designs mitigate the ill effects of process, voltage, and temperature (PVT) variations. They both rely on delay lines which, when made post-silicon tunable, offer the opportunity to add test margin into the design in which the delay line in shipped products is set slower than that which is successfully tested. This paper mathematically analyzes the...
We consider a cloud service based on spot instances and explore bidding and pricing strategies aimed at optimizing users' utility and provider's revenue, respectively. Our focus is on jobs that are heterogeneous in both valuation and sensitivity to execution delay. Of particular interest is the impact of correlation in these two dimensions. We characterize optimal bidding and pricing strategies under...
Unnoticed collisions compromise the success of remote exploratory tasks with mobile robots. We propose a vibrotactile stimulation method to represent frontal collisions that is based on the way people perceive impacts on a bar held with both hands. We observed that to estimate the impact point in a bimanual impact localization task people relied on amplitude and duration differences of the impact...
The task of nondestructive testing and diagnostics of pipeline networks by the method of acoustic tomography is considered. For the detect weak signals in the additive mixture of noise, it is proposed to perform digital correlation analysis of signals based on binary sign-function analog-stochastic quantization. In the process of such quantization is formed limited by the level of bipolar sign signal,...
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