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It is a significant application of wireless sensor networks to monitor a mobile target. Multiple sensor nodes cooperate to get an accurate estimation of the signal of the mobile target. Spatial correlation, induced by the spatial distribution of target and sensor nodes, is an inherent phenomenon of wireless sensor networks. This correlation causes redundancy amongst nodes which create redundant information...
Multipath delay profile models for ITS wireless communications are presented. Assuming roadside-to-vehicle communications and vehicle-to-vehicle communications, propagation measurement was carried out using 700MHz spectrum and delay profile models are established based on the measured data. In the paper, the method to extract the delay profile models from the measured data is firstly presented. The...
The innovative spreading codes used to modulate the new Galileo signals creates new challenges for receiver designers. It is well known in GNSS systems that longer integration times are needed to obtain a better sensitivity. However, the existence of the new tiered code concept that consists of the presence of a secondary code on top of the primary code to modulate the RF signal puts a limitation...
A long-distance channel measurement campaign with a maximum distance of 45 km was performed in Trondheimsfjorden, Norway. In this paper, we give a detailed description of the channel measurements including route, RX and TX antenna sites and other channel parameters. The results of received signal level (RSL) obtained by using two different signal processing methods are demonstrated, and it is found...
Based on static outdoor channel measurements we evaluate the influence of a vehicle on the MIMO radio channel, from a base station antenna array, to a multiple antenna handset in the hand of a user placed inside a test car. The measurement scenario is chosen to mimic a 2.6 GHz (LTE) macro-cell urban or rural scenario with two locations and orientations of the car, one at an open parking lot with a...
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)...
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