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Photoacoustic or PA waves, generated from blood cells, create distinct spectral features in the Fourier domain, for example, maxima and minima. In this way, high-frequency PA signals can be used to identify and distinguish blood cells. However, due to finite bandwidth of physical systems, many interesting Fourier features are invisible within the observed bandwidth. To overcome this challenge, we...
When local identification of a nonstationary ARX system is carried out, two important decisions must be taken. First, one should decide upon the number of estimated parameters, i.e., on the model order. Second, one should choose the appropriate estimation bandwidth, related to the (effective) number of input-output data samples that will be used for identification/tracking purposes. Failure to make...
A methodology that allows the separation of Faraday Rotation (FR) distortion from system induced distortion for the calibration of spaceborne polarimetric data is proposed. The separation is based on the frequency dependency of the FR across the system bandwidth and relies on the commonly used assumption that system distortions are frequency independent. A calibration schema appropriate for the calibration...
Fractal coding has been proved useful for image compression, and it is also proved effective for image retrieval. In the paper, we present a statistical method called variable bandwidth kernel density estimation to analyze fractal coding parameters. Then retrieve images using the retrieval parameters constructed with this method. Experimental results show that the proposed method with a variable optimized...
We propose PathML, an available bandwidth (i.e., unused capacity of an end-to-end path) estimation method based on a data-driven paradigm that uses machine learning with a large amount of data. An experiment over an operational LTE network was performed to compare our method with prior work.
In this paper, we propose a novel distributed Kalman filter (KF) over sensor networks using partial diffusion strategy, where each sensor only communicates with its neighbours and individual estimation vectors are partially transmitted to obtain local ones through convex combinations under communication bandwidth constraints. Proposed solution can obtain a trade-off between communications burden and...
Efficient test and diagnosis methods are required to ensure high levels of dependability of the electronic systems deployed to the market. These methods involve a trade-off in terms of accessibility to test nodes, test stimuli complexity, area overhead, and data processing that, altogether determine the impact that the involved operations have in the final cost, performance, and reliability presented...
For the unlicensed spectrum, the occupied bandwidth requirement is demanded by some regulations. The legacy scheme of Physical Random Access Channel (PRACH) for Long Term Evolution (LTE) cannot satisfy it. In this paper, we propose a novel PRACH transmission scheme to satisfy the requirement of unlicensed spectrum based on preamble pairing, and show some other candidates. We analyze and evaluate the...
In this paper, we investigate the performance of mobile vehicle positioning based on signal propagation delay estimation in the uplink case for a realistic propagation environment. In order to optimize the ranging performance, we introduce a parametric waveform. This waveform contains a scalar parameter for adjusting the distribution of the available signal power over the frequency. The optimization...
We study random access for machine-type commu- nications (MTC) based on the notion of compressive sensing (CS) over a distributed input distributed output (DIDO) system consisting of a number of remote radio heads (RRHs) that are closely located to devices. In a DIDO system, each active device can have a signature that depends on its connectivity to RRHs and the signatures of active devices are estimated...
Indoor positioning for visible light communication (VLC) has gained significant attentions recently with the popularity of light-emitting diodes (LEDs). In this paper, we consider a typical application of VLC by proposing a three-dimensional positioning scheme for a target terminal equipped with multiple photodiodes (PDs). Given the relative coordinates between the target terminal and receiving PDs...
Existing coflow scheduling frameworks effectively shorten communication time and completion time of cluster applications. However, existing frameworks only consider available bandwidth on hosts and overlook congestion in the network when making scheduling decisions. Through extensive simulations using the realistic workload probability distribution from Facebook, we observe the performance degradation...
Video streaming has become an indispensable technology in people's lives. However, the variability and instability of network conditions poses one of the biggest challenges to video streaming. In this paper, we study HTTP Adaptive Streaming (HAS), a technology that relieves these issues by adapting the video reproduction to the current network conditions. More specifically, we classify HAS strategies...
Mobile Broadband (MBB) access networks are becoming more and more used worldwide, and the devices adopted to access them are increasing in number and complexity (smartphones, mobile hotspots, vehicular infotainment systems). The highly dynamic nature of such scenarios calls for continuous monitoring and measurement of the network, and possibly cross-layer management of network applications. A recent...
A 10-bit 2GS/s time-interleaved SAR ADC with low-complexity background timing skew calibration is presented. 10% of the area is utilized for the interleaving mismatch estimation and correction. The ADC achieves −64dB mismatch spur and 50.1dB SNDR at Nyquist rate, with 10.4mW power consumption and 0.014mm2 area in 16nm.
A novel method for distance estimation is introduced, based on an OFDM signal combined with the Zadoff-Chu Sequences. By exploiting the properties of these sequences it is possible to evaluate the distance between a transmitter and a receiver with a very good precision and accuracy. The technique effectiveness is demonstrated in a real operating environment by measuring the distance between two active...
A memory polynomial (MP) based digital baseband predistorter for wideband base station RF power amplifiers is presented. The conventional memory polynomial based predistorter's inability to sufficiently improve the adjacent channel leakage ratio (ACLR) for high bandwidth signals is mitigated by using a linear FIR filter. The FIR filter compensates for the linear memory distortions and is employed...
A novel approach that allows to estimate the capacity of tuned bandpass filters under the influence of PSK-n-signals is introduced. Application recommendations are also provided.
Single-phase inverters are connected to the grid at the distribution system level. Because the grid impedance can be large at this level, it is important to consider the effect of the grid impedance on the control performance of the inverter. A PI controller is often adopted for current control in a single-phase inverter. With an increase in the grid impedance, the open loop cut-off frequency decreases,...
This paper investigates a signal area (SA) estimation method for spectrum measurements. The spectrum measurements is for estimating statistical information of spectrum usage and required latency is not very critical compared to spectrum sensing. SA denotes the area (in time/frequency domain) occupied by the primary user's signal. The traditional approach, which utilizes Fourier transform (FT) and...
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