The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
One of the most ubiquitous feature of biological systems is that they generally output signals with long-range correlations. As Boolean networks has been successfully used to model a number of biomolecular systems. In this paper, we studied the long-range correlation behaviors of this model. Our results show that Boolean networks can undergo a regular transfer from Brownian noise to 1/ f process,...
Object tracking is a classic problem in the computer vision field. Its main purpose is to get the locations, the motion parameters, the trajectories and other information of the objects from the videos. An Adaboost tracking algorithm based on the particle framework is proposed in this paper. Due to the existence of high noises in the training samples, the difficulty of the AdaBoost training and the...
A novel method is introduced in this paper that detects the number of signal sources utilizing the uniformity of MUSUC spectrum. MUSIC scanning spectrum has different uniformity with different noise subspace. The standard deviation is utilized to describe the uniformity of MUSIC scanning spectrum. According to the turn point of the standard deviation curve, the source number is detected and the locations...
In wireless sensor networks (WSN), battery energy efficiency is a crucial issue since the sensor nodes in WSNs are generally driven by nonrenewable batteries. In recent years, there has been an increasing trend of incorporating special battery characteristics into network protocol design and optimization. This paper provides the overview of battery energy consumption optimization for two specific...
Temporal noise sources in 4-T pinned photodiode (PPD) active-pixel-sensor (APS) are analyzed basing on a typical APS pixel structure working during reset, integration and readout operation. Complete reset operation and incomplete reset operation result in different reset noise power. Incomplete reset can realize lower noise power but cause image lag. To cover the problem a “pre-reset” technique for...
Utilization of multiple channels in ad hoc networks provides the benefits of reducing the probability of collisions, decreasing the normalized propagation delay and support of QoS. However, problems like busy waiting or deadlock existence degrade the bandwidth utilization. In this paper, we introduce two neighbor indexing schemes which assign different sequence numbers to the neighbors of every nodes...
A tank experiment on direct blast suppression (DBS) in bistatic sonar was conducted in Harbin Engineering University. Two algorithms were compared in data processing. The first one is jamming matrix algorithm and the second one is nulls constraint matrix algorithm. Both algorithms need the prior information of the direction of arrival (DOA) of direct blast (DB). Experimental results indicate that...
The techniques in the parameter retrieval procedure based on Nicolson-Ross-Weir (NRW) approach are discussed for asymmetric composite right/left-handed transmission line (CRLH TL). A 10mm-long microstrip transmission line is calculated by the revised method for validation and comparison. An improved lumped parameter extraction in equivalent circuit modeling is proposed for unbalanced CRLH TL. The...
Present day mobile robots are meant for very precise applications. For very precise applications of mobile robots, accurate estimation of inertial parameters depends upon the accuracy of mathematical model & as well as accuracy (error characteristics) of the individual sensor measurements. Multiple sensors add redundancies to the system as well as it helps to estimate the system states accurately...
Many high-resolution methods suffer from serious drawbacks. Indeed, they are not able to process more than N-1 noncoherent sources from an array of N sensors and are weakly robust to the presence of a strong colored background noise whose spatial coherence is unknown. Mainly to overcome these limitations and in particular to increase both the resolution and the number of sources to be processed from...
Underwater acoustic (UWA) communication researches continue to focusing on higher spectrum-efficiency. This paper proposes a low complexity spatial parallel transmitting scheme based on layered space-time coding and spectrum spreading, named LST-SS scheme, to increase spectrum efficiency of UWA communication systems. In this scheme, layered signals are spread by the spreading code. Detection of signals...
With the development of the vector hydrophone, the underwater NAH (nearfield acoustic holography) technology based on the particle velocity measurement gradually become a research hotspot. Compared with the measurement of the sound pressure, the particle velocity amplitude decays more quickly which makes it have a better resolution for the complex sound sources situation. Particularly when reconstructed...
The main problem of active sonar detection is that the reverberation has spatial and temporal two-dimensional coupling characteristic which is similar to clutters in airborne radar. This paper presents a sparse sample matrix inversion with diagonal loading (SSMI-DL) for reverberation suppression in active sonar. The proposed method transfers Pulse Doppler radar STAP processing techniques into active...
In this paper, we adopt a novel waveform for impulse radio ultra wideband (IR UWB) ranging and positioning, which is a Barker coded Gaussian pulse train. The waveform can enhance both signal to ratio (SNR) and time of arrival (TOA) estimation or ranging performance compared to traditional single Gaussian pulse or identical Gaussian pulse train. It can sharpen the main peak and suppress the sidelobes...
Three kinds of direction-of-arrival (DOA) estimation methods based on acoustic vector sensor (AVS) array are studied in this paper. The detection and DOA estimation performances are analyzed by computer simulation, and the results show that the AVS array cross-spectrum estimation method is better than the AVS array beamforming and the AVS array average acoustic intensity method, especially under low...
In this paper, we propose the unicast-multicast balancing protocol which improves the multicast outage probability performance satisfying maximum tolerable outage probability for unicast messages. The wireless relay-multicasting system comprises of a source S, a relay R, and K + 1 destinations Di, i ∊ {0, 1, …K}. Each Di, \ {D0}, i ∊ {0, 1, …K} wants to receive only the multicast messages. On the...
A novel, compact bandpass filter is proposed using stepped-impedance resonators (SIRs). The basic filter structure is composed of two parts, the central SIR sections and the input/output (I/O) SIR sections. The two central SIRs are folded to achieve a compact size and coupled to the I/O SIRs. This new structure has an inherent transmission zero on the upper stopband edge. The skew-symmetric feeding...
This paper proposes a design of symbol timing synchronization for MB-OFDM systems with low hardware consumption. Most of the existing algorithms for symbol timing synchronization cost a huge number of operations on cross-correlation or energy computing, so that, a great amount of multipliers and logic resources would be consumed if these algorithms are implemented on FPGA. The scheme proposed and...
In this paper, we investigate the robust transceiver design for dual-hop amplify-and-forward (AF) MIMO relay systems with Gaussian distributed channel estimation errors. Aiming at maximizing the mutual information under imperfect channel state information (CSI), source precoder at source and forwarding matrix at the relay are jointly optimized. Using some elegant attributes of matrix-monotone functions,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.