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The proposed PID tuning method has similar approach to the recently published paper of Shamsuzzoha and Skogestad (2010). It is one step procedure to obtain the PI/PID setting which gives the better performance and robustness. The method requires one closed-loop step setpoint response experiment using a proportional only controller with gain Kc0. On the bases of simulations for a range of first-order...
Several studies have been carried out to minimize the multipath error effects in Global Positioning System (GPS) receiver. Most of these studies achieve an acceptable performance with medium and long relative delay multipaths. In this paper we propose a Modified Short Multipath Insensitive Code Loop Discriminator (MSMICLD) using an Early minus Late (E-L) envelope discriminator function. The proposed...
To increase the accuracy of static timing analysis, the traditional nonlinear delay models (NLDMs) are increasingly replaced by the more physical current source models (CSMs). However, the extension of CSMs into statistical models for statistical timing analysis is not easy. In this paper, we propose a novel correlation-preserving statistical timing analysis method based on transistor-level gate models...
The design and implementation on an FPGA of a correlation system for the American and Russian Global Positioning Systems (GPS and GLONASS) receivers are presented in this paper. This system permits processing the received signal asynchronously with the data-bits. Typically, in GPS and GLONASS receivers, correlation channels receive the samples in intermediate frequency signal, process them through...
We precisely measure the time-energy correlation of broadband, spontaneously generated four waves mixing, and demonstrate surprising intensity dependent splitting of the correlation in both time and frequency and coupling effects between the domains.
Correlations of twin beams generated by parametric down-conversion are quantitatively determined by two-photon counting interferometery. Compared with incoherent light, photon extrabunching at the fs scale is unambiguously and precisely measured.
The reverse links of 3G cellular systems, which are based on code division multiple access (CDMA), require that the base station synchronizes with each user's length N spreading code to despread and demodulate the information bits. A method of obtaining chip-level synchronization for all K users of the system simultaneously was recently presented [3]. The approach uses a modified transpose domain...
There are many studies dealt with handoff management in mobile communication systems and some of these studies presented handoff schemes to manage this important process in cellular network. All previous schemes used relative signal strength (RSS) measurements. In this work, a new proposed handoff scheme had been presented depending not only on the RSS measurements but also used the threshold distance...
This paper analyzes the exact average symbol error rate (SER) performance of beamforming in spatially correlated multiple-input single output (MISO) systems with channel estimation error and feedback delay. We derive the joint distribution function of two quadratic forms and employ the result to obtain an expression for the cumulative distribution function (cdf) of the received signal-to-noise ratio...
For all DS-CDMA based satellite navigation systems which have been emerging these days, it is required to design a set of spreading sequences to eliminate both multi-access and multi-path interference. In a typical CDMA system, it is well-known that it is highly impossible for the spreading sequences to possess both ideal cross-correlation and ideal auto-correlation properties simultaneously. Recently,...
In this paper, we investigate the relationship between human sense and motion in coupled human balancing tasks. We propose a measurement system to obtain the balancing error produced by two human subjects stabilizing a coupled inverted pendulum model in cooperation. After an experiment to measure the balancing error, each subject evaluated the performance of manipulation of both his own self and his...
The performance of cognitive radio is determined by the spectrum occupancy, which is correlated in space, time and frequency. In this paper, the theory of random fields is applied to model the spatially correlated spectrum occupancy. The entire cognitive radio networks are modeled as a plenary grid or a straight line. Two dimensional and one dimensional Ising models are applied to model the joint...
Time delay estimation is important task in many signal processing application. Cost function parameter is used for estimating true delya's. In this paper we have modified the cost function by taking into account the low pass filtering characteristics of channel. Results obtained are calculated with the help of accuracy percentage.
This paper introduces a Swarm-Intelligence based Routing protocol (SIR) that aims to efficiently route information in content centric Delay Tolerant Networks (CCDTN) also dubbed pocket switched networks. First, this paper formalizes the notion of optimal path in CCDTN and introduces an original and efficient algorithm to process these paths in dynamic graphs. The properties and some invariant features...
North American freight railroads are expected to experience increasing capacity constraints across their networks. To help plan for this increased traffic, railroads use simulation software to analyze the benefits of capacity expansion projects. Delay increases exponentially with volume as individual lines and the network become more saturated with traffic. Simultaneous operation of heterogeneous...
In direct sequence (DS) spread spectrum communication system, the first condition of receiving correct data is code synchronization. Synchronization is one of the key techniques in spread spectrum communication systems. This paper presents pseudo-noise (PN) code acquisition and tracking technology. Spread spectrum communication technology is combined with software radio technology to constitute spread...
The network-centric warfare concept pursues information superiority as the key strategic advantage. However, information can have a different strategic value depending on its criticality and, thus, communication systems should provide higher priority to critical data. In this paper, performance of different approaches to achieve such differentiation in TDMA satellite-based tactical communication systems...
A general aim of geometry-based stochastic channel models (GSCMs) is provision of imaginary, but realistic propagation channel responses that can be used as a reference channel in evaluating performance of mobile communication systems. This paper provides an overview of recent development in the GSCMs with particular emphases of 1) structural refinement, 2) parametrization, and 3) validation of the...
In this paper, the problem of identification and recognition of an unknown source of experimental seismic vibrations in real time is described. The influence of different signal delays on frequency spectrum as well as autocorrelation and crosscorrelation functions is examined. It is also illustrated what is the effect of different pulse width on spectrum and correlation functions.
We consider cooperative communications where nodes forward information for each other to achieve reliable communication. Cooperative communication is realized through various protocols such as Decode-and-Forward which are primarily designed with the assumption that nodes are always willing to cooperate. However, in practical systems nodes may violate the rules of cooperation with the selfish intention...
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