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In this paper, we propose a novel method to generate the cyclostationary signature for Orthogonal Frequency Division Multiplexing (OFDM) signals with a low overhead of signature (i.e. number of signature subcarriers) and a good performance of the signature detection under frequency-selective fading channel, for dynamic spectrum access (DSA) networks. Moreover, we also present how to employ the proposed...
Joint detection in the uplink of a cellular network involving several non-colocated base stations is a promising means to turn inter-cell interference into useful signal energy and hence dramatically increase spectral efficiency of reuse one networks. To maximize the benefits of the new degrees of freedom that come with base station cooperation, cluster centric schedulers need to be aware of the interference...
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...
To accurately observe the characteristic, or behavior, of the PA, the test platform is required to have enough bandwidth and dynamic range. Digital processing techniques for extending the dynamic range and bandwidth of the measurement instruments are discussed. Test results show that employing such techniques can successfully build a test bed of high dynamic range and wide bandwidth.
Because of the multiple side peaks in the Binary Offset Carrier (BOC) autocorrelation function (ACF), the probability of locking on a side peak will be generated in BOC code tracking process for next generation of global navigation satellite system (GNSS) receivers. A novel unambiguous tracking method based on an ideal reference function is proposed in this paper to remove the ambiguity problem. This...
The chaotic characteristics of power system daily load sequence in the certain city is analyzed and calculated based on saturated correlation dimension method, it give a conclusion that power load time series belongs to chaotic series. Short-term power load forecasting is accomplished by using local linear prediction method based on phase space reconstruction theory. The prediction results show that...
Medium waveband navigation systems are considered. Systems using code-division multiplexing have intrasystem interference level determined by cross-correlation sidelobe. Interference immunity of spread spectrum signal with minimum shift keying correlation receiver is improved with powerful adjacent-channel interference compensator providing high accuracy interference copy forming. Correlation receiver...
In this paper, a generalized likelihood ratio test (GLRT) is adopted to realize optimum detection for differential UWB signal. Supposeing the channel circumstance is unknown, receiver presented in this paper is structured as follows. First of all, the maximum likelihood (ML) estimation of channel is completed. And then statistic detection of differential UWB signal is practiced. The receiver is approved...
In order to implement the heterogeneous wireless network using multiple wireless systems, it is important to comprehend the transmission quality characteristics such as the transmission throughput and delay, because the network control managements are performed based on these qualities. In this paper, we address the study results regarding the transmission quality characteristics of the Wireless LAN...
In this empirical analysis of Shanghai Composite Index, we focus on the relationship between maximum Lyapunov exponent, fractal dimension and stock price. The former one is to measure the chaos degree of the market. And under relatively weak chaos condition, fractal dimension, which is defined by Hurst exponent, is found to be an ideal prediction of stock price. Both of maximum Lyapunov exponent and...
Space information networks promise encouraging prospects in areas of detection, communication and location. In this paper, node and link evaluation algorithms are proposed to provide reconfiguration basis for such networks. Given that space information networks operate in multi-application environments and offer diverse services, we take connectivity and availability into comprehensive consideration...
The stochastic resonance in a time-delayed Logistic growth model subject to correlated multiplicative and additive white noise as well as to multiplicative periodic signal is investigated. Using small time delay approximation, we get the expression of the signal-to-noise ratio (SNR). It is found that the SNR is a non-monotonic function of the delayed times, of the system parameters, of the intensities...
A new nonlinear method is proposed for predicting the mine water inrush. According to the fractal theory, the phase space of time series obtained from the mine water inrush is reconstructed. And the minimum embedding dimension is determined with Cao method, then the minimum embedding dimension is used for the input node of the support vector machines. The prediction model of time series is established...
We propose a novel approach to calculate the conduction velocity (CV) of the uterine contraction bursts in magnetomyogram (MMG) signals measured using a multichannel SQUID array. For this purpose, we partition the sensor coordinates into four different quadrants and identify the contractile bursts using a previously proposed Hilbert-wavelet transform approach. If contractile burst is identified in...
We evaluated neurovascular and autonomic response to a Divided Attention task within a group of 16 healthy subjects, by means of Electroencephalography, Electrocardiography, functional Near Infrared Spectroscopy techniques, acquired simultaneously. We exctracted Alpha (8–13,5 Hz) and Beta (13,5–30 Hz) power rhythms with a spectral autoregressive residual model, and inter-beat-interval (RR series)...
The time-series data analysis described here is based on the simple idea that the accumulation of the effects of lifestyle events, such as ingestion and exercise, could affect personal health with some delay. The delay may reflect complex bio-reactions such as those of metabolism in a human body. In the analysis, the accumulation of the effects of lifestyle events is represented by a summation of...
The correlation network of neurons emerges as an important mathematical framework for a spectrum of applications including neural modeling, brain disease prediction and brain-machine interface. However, construction of correlation network is computationally expensive, especially when the number of neurons is large and this prohibits realtime applications. This paper proposes a hardware architecture...
The work presented herein proposes an algorithm for joint Carrier Frequency Offset (CFO) and channel estimation, acquisition and tracking, for OFDM systems in the presence of very high mobility. The algorithm is based on a parametric channel model. Assuming the path delays are known, the multi-path Rayleigh channel Complex Gains (CG) variation, within one OFDM symbol, is approximated by a Basis Expansion...
In this work we report the main conclusions of the European Space Agency (ESA) Metawave project (Mitigation of Electromagnetic Transmission errors induced by Atmospheric Water Vapour Effects) for what concerns the Synthetic Aperture Radar Interferometry (InSAR) viewpoint. The Atmospheric Phase Screen (APS) estimated with the Permanent Scatterers (PS) technique in the test sites of Roma and Como has...
In this paper, Changes in length of day (ΔLOD) are obtained through the processing of the 2009.1–2010.11 VLBI data; the time series of distance of the Moon and Earth obtained from Jet Propulsion Laboratory (JPL) ephemeris are calculated. Trend of Δ LOD and the Earth-to-Moon distance are removed, and the periods of them are calculated with spectral analysis. The correction between the Earth-to-Moon...
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