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Localization is a crucial part in robot navigation. The significance of this issue is to the extent that further achievements in terms of robot control is highly dependent on that. There are various methods addressing this subject, among which the extended Kalman filter is proved to be one of the most successful ones. In classic extended Kalman filter, covariance matrixes of process noise Q and measurement...
As part of ONR's Integrated Topside (InTop) Program, in 2014 Northrop Grumman delivered a bi-static, active, electronic scanned array (AESA) system, capable of multifunction, simultaneous transmit and receive operation. The system is wide band, transmits high power and has high receive sensitivity. Further, there are simultaneous transmit and receive modes required, in which the transmit AESA radiates...
We introduce a novel programming algorithm that is particularly suitable for 3D NAND. With larger design rules and charge trapping (CT) device 3D NAND is much less sensitive to interference therefore should not use elaborate and costly algorithms designed for scaled 2D NAND. By binary division of cell Vt into smaller groups the number of verification pulses can be reduced. For MLC/TLC which requires...
In this paper, we have investigated the effectiveness of Particle swarm optimization (PSO) with extended Kalman smoother (EKS) for fetal ECG extraction from single channel electrocardiogram (ECG) recorded at abdominal area of mother's skin. The abdominal ECG is considered to be composite as it contains both mother's and fetus ECG and is dominated by maternal ECG component. To extract the fetal ECG,...
A physical layer specification for a low power, low complexity, low data rate sensor network suitable for agricultural monitoring is investigated. Code division multiple access (CDMA) with high processing gain is used to facilitate transmission powers which comply with the Ultra Wide Band (UWB) spectral mask, and this permits physically small nodes with limited energy storage capacity. The interference...
The classical preamble-based channel estimation for pulse shaping orthogonal frequency division multiplex/offset QAM (OFDM/OQAM) systems requires zero-value guard symbols to guarantee interference avoidance, which leads to low spectral efficiency. In this study, we cut down the preamble structure without zero-value guard symbol to reduce preamble resource overhead. However, the intrinsic imaginary...
The problem of allocation of frequency resources between users in cognitive radio networks using cognitive map is considered. Factors on this map are: the delay queue arrival rate of packets from the subscriber station, the signal-to-interference + noise, the requested resources, the resources available and allocated resources.
This paper describes a successive multiuser detection technique for Direct Sequence Code Division Multiple Access (DS-CDMA) systems. In conventional CDMA system, single-user detection is employed, so that the interference between users or multiple access interference (MAI) component is considered as noise, which contributes to the statistics of detection variables affecting the quality of detection...
In the recent years, power line communication technology has seen a rapid development. However, due to the unsteadiness of the power line channels, there are still some problems of obstruction and attenuation in this field which decrease the prospect and scope of this technology. This paper which is based on previous basic studies about spread spectrum communication and OFDM (orthogonal frequency-division...
The aim of the paper is to study the possibility of advancing noised non-Gaussian processes recognition using the features based on higher-order statistics. Several new recognition features based on the higher-order statistics, the basis of advancing recognition results in the presence of noise, decision rules and recognition system frameworks we proposed in the paper. The efficiency test of the proposed...
Automatic Gain Control (AGC) system performance generally depends on the ability to accurately estimate receive signal power. The initial gain setting may be set high to ensure that low power signals can be detected. As the Variable Gain Amplifier (VGA) resides before the Analog to Digital Converter (ADC), there is a potential for heavy saturation at the output of the ADC, where this estimation is...
To improve the localization accuracy in a small scale of indoor environment a passive target localization method is presented. The indoor target localization system is consisted of four wireless transmitters which could transmit known signals. The receiver meaning the target passively receives four signals from the four signal transmitters and then calculates the propagation time differences of arrival...
The meteor trail interference worsens the performance of the sky wave OTHR. The interference greatly reduce target detection capability. An approach based on Gabor coefficient and binary hypothesis to restrain the meteor trail interference is developed in this paper. The approach is used to process the real measurement data of a Chinese sky wave radar and show effectiveness.
Electromagnetic compatibility (EMC) is the ability of a Radio communication Equipment (RCE) to operate with a desired quality of service in a given Electromagnetic Environment (EME) and not to create harmful interference with other RCE. This paper presents an algorithm which improves the simulation speed of estimating EMC of RCE in a complex EME, based on a stage by stage frequency-energy filtering...
Suppressing narrow-band interference is one of the key techniques of partial discharge (PD) on-line monitoring. Based on the characteristics analysis of FFT power spectrum of PD signals with and without the narrow-band interference, the partial peaks and partial energy ratio is defined. Thus, a method of suppressing narrow-band interference using partial energy ratio pretreatment is proposed, and...
A realistic model for the geometry of a mobile wireless network, i.e. the spatial configuration of its nodes, must take into account the randomness involved in nodes' locations which is the consequence of the unpredictanle movement of nodes. Stochastic geometry and point processes are rich mathematical disciplines which can be used to model such random wireless networks. In this paper, we discuss...
Primary results of fundamental research in the field of radar theory are presented. The novelty of the research consists in the following: within the scope of energy conservation law and Bayes statistical decision theory a new approach to the process of target radar signals detection on the basis of energy criterion is considered. A condition for radio-signals optimal energy detection against a background...
Detailed knowledge of the interference scenario is necessary for power line communication (PLC) systems. PLC model with appropriate noise model creates the basics in a way of searching for the most powerful coding and modulation techniques. This paper brings an overview of PLC communication model focusing mainly on a noise scenario. Finally, a blocks of the PLC communication model are mentioned and...
We study the influence of the interference between the integrated closed-loop circuits such as PLL circuits based on circuit simulation. Two different types of oscillators which are the ring and the LC-tank oscillators are applied to this analysis. We investigate the influence of the shared analog supply of two PLLs and the capacitive connection between the loop filter of the PLL and the digital circuit...
Recently, the evaluation on quality of the air interface in a wireless network has shifted from emphasis on QoS (quality of service) only to incorporation of QoE (quality of experience). However, it seems that QoE metrics have not been related to the surroundings of the served users so far, which may have a great influence on users' expected QoE. For instance, with a high level of QoS, a user's expectation...
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