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In the authors derived an outer bound, called functional dependence bound, for network information flow with independent sources. In this work, we derive outer bounds for network information flow with correlated sources and establish that the functional dependence bound is an outer bound for achievable region for networks with correlated sources. We also show that the bounds are loose and can be tightened...
The separability conditions imposed on mixing matrices and sources, which form the basis for blind source separation, are usually supposed to be satisfied when an algorithm is proposed or used. However, in practice, we only have the observations at hand, and if an algorithm fails to separate sources in a given scenario, it is especially interesting to know why this could happen. In this paper, we...
In this study, the fluidized bed evaporator of natural circulation with different the holdup of solid particle are experimental studied. The holdup of solid particle, pressure fluctuation signals and heat flux are measured. Analyses of chaotic time series on pressure fluctuation signals are conducted to determine the relationship between chaotic characterizations parameter. The values of Kolmogorov...
A new correlation velocity measurement based on geomagnetic data is proposed, which aims at satisfying requirements of autonomous navigation system with long-endurance and high precision. Firstly, definition and principle of geomagnetic velocity measurement are introduced. Then, geomagnetic signal process and correlation is researched. Furthermore, the simulation is made with MATLAB on the geomagnetic...
Most of the existing interacting multiple model (IMM) based fault diagnosis approaches are limited to systems with synchronous sensors. In this paper, the actuator fault diagnosis problem for dynamic systems with multiple asynchronous sensors is studied. An asynchronous IMM fusion (AIMMF) algorithm is proposed to fuse measurements from multiple asynchronous sensors without ignoring correlations between...
Spectrum sensing is a fundamental component in cognitive radio. A major challenge in this area is the requirement of a high sampling rate in the sensing of a wideband signal. In this paper a wideband spectrum sensing model is presented that utilizes a sub-Nyquist sampling scheme to bring substantial savings in terms of the sampling rate. The correlation matrix of a finite number of noisy samples is...
Signal feature extraction of self-excited torsional vibration had been a effective ways to identify the large-scale rotating machinery dynamic fault characteristics and analysis. For solving the problem of feature extraction of signal on transient impact torsional vibration, correlation dimension was studied to be used for signal processing. Based on fractal theory, self-similarity statistical feature...
It is expected that MIMO and CoMP technologies will be able to improve user throughput at the cell edge and indeed the whole cell. Since the performance of these technologies greatly depends on the spatial, polarized and cross-polarized correlation characteristics, it is important to analyze them in sufficient detail. This paper clarifies these correlation characteristics for single-BS MIMO and multi-BS...
This paper demonstrates the use of two new methods of feature extraction called temporal energy of subband cepstral coefficient (TESBCC) and temporal correlation of subband cepstral coefficient (TCSBCC) for text-independent speaker identification. The focus of this work is on applications which yield higher identification accuracy without increasing the computational effort. The impetus for these...
A compact planar array with parasitic elements is studied to be used in MIMO systems. Classical compact arrays suffer from high coupling which makes correlation and matching efficiency to be worse. A proper matching network improves these lacks although its bandwidth is low and may increase the antenna size. The proposed antenna makes use of parasitic elements to improve both correlation and efficiency...
Spatial correlations of incremental electric and magnetic currents, and Huygen's sources with different arrangements (parallel and collinear) are studied in this paper; showing computed results as well as some analytical closed-form expression. It is found that the correlation depends both on the isolated far field function and the arrangements, and of course the spacing. These correlations are compared...
This work proposes the MIMO channel capacity that explicitly depends on the spatial correlation characteristics of the urban environment. The spatial correlation among the channels is determined by the parameters of the urban environment introduced via the statistical model. The proposed MIMO channel capacity provides an analytical framework for investigation the influence of urban propagation conditions...
Using techniques such as spatial division multiplexing (SDM), transmit beamforming, and space-time block coding (STBC), MIMO systems like IEEE 802.11n are conceived to increase dramatically throughput or to improve the reception range. Nevertheless, MIMO equipment in an indoor environment shows that the power level received in non-noisy conditions is not sufficient to explain the throughput variations...
In this paper we present a channel model for Wireless Sensor Networks at 868 MHz within the aircraft. Door-to-cabin channel measurements have been performed in order to characterize pathloss, fading and correlation properties of the radio channel.
In this paper, the spatial pattern of on-body narrowband radio propagation has been characterized by using spatial autocorrelation model. Correlograms is combined with Z score to show the spatial correlation properties and corresponding confidence level. Results demonstrated that for narrow band channel for indoor environment, measurements are repeatable, when we have slight variations in the antenna...
An innovative methodology for the design of correlator arrays for radio astronomy applications is presented. The technique exploits the low correlation properties of Almost Difference Sets (ADSs) to synthesize open-ended “Y” array configurations with maximum u-υ coverage both in snapshot and in tracking observations. A preliminary numerical validation is presented to assess the performances of the...
A new modelling method suited to the dual circular polarised 2×2 (MIMO) channel applicable to land mobile satellite (LMS) communications in line of sight cases is presented. In this scenario, it is necessary to apply correlated fading to the co-polarised and cross-polarised channels separately in order to model the evident polarization multiplexing in such channels found from measurement data. Comparisons...
This paper proposes a new method to solve the permutation problem in the frequency-domain source separation based on Independent Component Analysis (ICA). Traditionally, the correlation coefficient of separated signal envelopes is calculated to determine if the separated signals originate from the same source. Recently, a new measure has been proposed, which represents the dominance of the separated...
In this paper, an efficient means to provide personal identification using finger print has been proposed. Field orientation method available in literature overcomes the drawbacks in the minutiae method. In order to get a better accuracy in identification even in noisy condition, a new method - Cross Correlation of Field Orientation (CCFO) is proposed in this paper. The proposed scheme uses field...
The aim of this paper is to estimate muscle fatigue by using wavelet analysis method in SEMG signal analysis. A signal acquisition system is designed and forearm muscle fatigue experiments under static and dynamic contractions are performed. The wavelet analysis method is proposed to group the wavelet coefficients of SEMG signal into high frequency-band (100Hz-350Hz) and low frequency-band (13-22Hz)...
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