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The idea of colour filter array may be adapted to multispectral image acquisition by integrating more filter types into the array, and developing associated demosaicking algorithms. Several methods employing discrete wavelet transform (DWT) have been proposed for CFA demosaicking. In this work, we put forward an extended use of DWT for multispectral filter array demosaicking. The extension seemed...
Doppler radar-based fall detection has been attractive due to its low cost and high detection performance. However, fall detection based on Doppler signatures is affected by the spatial variance due to the multipath and non-line-of-sight (NLOS) effects, which has been one of the key issues for detection performance in current Doppler radar-based systems. Moreover, the drawbacks of Doppler radar are...
Using large number of antennas at base station (BS) to formulate a multi-user multiple-input multiple-output (MU-MIMO) system, i.e., the massive MIMO, has attracted more and more attention recently, due to the high spectrum and energy efficiency it has. When there is correlation and mutual coupling, Rusek et al. showed that the channel may lose asymptotic orthogonality as the number of antennas increases...
In this paper, we propose a novel type of Impulse Radio Ultra-Wideband (IR-UWB) beamforming structure that we named a chirp beamformer. It represents an alternative to the well-known correlation beamforming paradigm. The chirp beamformer uses a chirp pulse as a symbol waveform. In comparison with a correlation beamformer, the chirp beamformer requires considerably lower timing resolution in cases...
A 12-lead ECG hardware device with compression scheme using set partitioning in hierarchical trees algorithm is reported. The compression algorithm is expanded with beat reordering technique in order to increase the regularity between signal in 2D ECG array, hence reduce the error while maintain to 1:8 compression ratio. Experimental results shows that the error of sorted compressed signal is less...
A new pilot-aided subspace channel estimation algorithm for orthogonal frequency division multiplexing (OFDM) systems is proposed. The channel model is a sparse L-multipath channel with gains subject to Rayleigh fading. The new algorithm constructs M2 virtual pilot tones from M physical pilot tones, and employs the subspace method, MUSIC, to estimate the multipath time delays. With the delay information,...
Internet random time delay constitutes a major challenge for Internet-based teleoperation systems. Since the uncertain time delay may degrade the system performance, and even lead to instability. Although large-scale research works have been conducted on the understanding, testing, and analysis of Internet round trip time delay (RTT), it is not appropriate to use RTT in control methods design. It...
Direction-of-arrival (DOA) estimation of a speech source has generated great interest in recent years. Traditional methods, such as the steered response power (SRP) estimator, make use of a multi-element microphone array and can perform well in the presence of moderate noises and reverberations. Those algorithms are particularly good for Gaussian source signals, while for non-Gaussian speech signals,...
In this paper, we study on DOA estimation error reduction by nested array in the presence of correlated waves. In recent years, at simple array signal processing technique called nested array has been proposed. By using the technique, degrees-of-freedom of the array can be easily increased. However, accuracy of DOA estimation deteriorates when correlated or coherent waves arrived. Therefore, in this...
Extended Symbol OFDM (ES-OFDM) is applied in case of a multiple antenna receiver. The receiver architecture is based on the observation that OFDM constellation points can be determined by means of correlation. Summing correlations between multiple antennas leads to an interferometer receiver. This approach gives the freedom to choose which correlations are summed. Three antenna structures are explored:...
We present a power-saving method for storage systems in Internet hosting services, particularly those providing video/photo sharing services. The key idea behind our method is to skew the workload towards a subset of disks in the storage array, thereby extending the periods in standby mode of the other disks. Our method is based on the idea behind PDC, but the main objective of this study is to investigate...
Detection and identification of multiple radio controlled (RC) devices emitting unintended passive emissions has attracted much attention due to its importance in many security applications. This paper describes and analyzes major challenges in detection of multiple independent radio controlled (RC) sources in real life environment. A time based correlation method is proposed for array detectors to...
Determination of the beam parameters of a probe beam is essential for many applications across science. Full characterisation of a coherent beam requires numerous measurements of the beam profile both inside and outside the Rayleigh range to determine values of w0, the beam waist size, and M2. In the EUV (extreme ultraviolet, λ<50nm) and X-ray (λ <10nm) regimes, this is particularly difficult...
Digital Signal Processing (DSP) operations are very important part of engineering as well as medical discipline. Designing of DSP operations have many approaches. For the designing of DSP operations, multiplication is play important role to perform signal processing operations such as Convolution and Correlation. The new approach of this implementation is mentally and easy to calculate of DSP operations...
The paper addresses the problem of constructing signature sequences for quasi-synchronous CDMA systems. We employ two ℓ — ary sequences, i.e. ℓ symbols sequences, with ideal two-level autocorrelation and a Costas or Golomn Costas sequence to construct a signal set with long Low Correlation Zone length and low maximum magnitude of correlation values. We obtain an Low Correlation Zone (Νp, p, p, Ν)...
An electronic nose is an intelligent system consists of a sensor network and a pattern recognition system able to know simple and complex odors. As the human nose, the artificial nose must learn to recognize different odors: the learning phase. There are several types of sensors such as fiber optic sensors, piezoelectric sensors, sensor type MOSFET. The performance of the sensor network is discussed...
In this paper, we formulate and experimentally demonstrate direction of arrival (DoA) estimation with a two-port composite right/left handed (CRLH) leaky-wave antenna (LWA) using the multiple signal classification (MUSIC) algorithm. The CRLH LWA consists of a cascade of metamaterial unit cells, periodically modulated using varactor diodes. By changing the voltages across series and shunt varactors,...
In this paper, we present a method to localize multiple sources using randomly distributed wireless sensor nodes. The principle of maximum power collection is used to obtain the beamforming weights which add the source signal constructively at the sensor outputs. The beamforming weights give the time difference of arrival (TDOA) for each of the sources from which the source location is subsequently...
We propose a novel scheme for broadband generation of photon pairs combined with efficient spatial pump filtering. This is achieved through spontaneous parametric down-conversion in a system of nonlinear adiabatically coupled waveguides.
Unauthorized redistribution of a movie is a common threat to digital media that can be prevented by digital video watermarking. The watermark is commonly embedded into the luminance (Y) component of a video frame. The chrominance (U) component supports more distortion than the Y component without being perceived by human eyes. Thus, in our proposed approach, the watermark is embedded into the U component...
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