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The Over-The-Horizon (OTH) locating of radiation source can be realized by the troposcatter propagation of electromagnetic (EM) signals. This paper studies the troposcatter signal group delay for target ranging and proposes a modified beamspace MUSIC to estimate the arrival azimuth angle of the troposcatter signal. Finally, the OTH target can be located by the ranging and azimuth angle estimation...
Existing systematic constructions of optimal odd-length binary Z-complementary pairs (OBZCPs) only generate pairs with lengths 2α + 1 (where α is a non-negative integer). In this paper, we propose a new construction of optimal OBZCPs having generic lengths of 2α10β 26γ + 1, α ≥ 1 (where α, β and γ are non-negative integers). This is achieved with the aid of several interesting intrinsic structure...
In this paper, we give a construction of optimal sets of N-ary perfect sequences of period N, where N a positive odd integer. For this, we first re-define generators, perfect generators, and optimal generators which were originally defined for odd prime lengths by Park, Song, Kim, and Golomb in 2016. Based on this, we propose a construction of optimal generators of odd lengths by using optimal generators...
This paper presents a new adaptation of Zadoff-Chu sequences for the purpose of range estimation and movement tracking. The proposed method uses Zadoff-Chu sequences utilizing a wideband ultrasonic signal to estimate the range between two devices with very high accuracy and high update rate. This range estimation method is based on time of flight (TOF) estimation using cyclic cross correlation. The...
A novel method for distance estimation is introduced, based on an OFDM signal combined with the Zadoff-Chu Sequences. By exploiting the properties of these sequences it is possible to evaluate the distance between a transmitter and a receiver with a very good precision and accuracy. The technique effectiveness is demonstrated in a real operating environment by measuring the distance between two active...
In short observational records, with reducing the data length it becomes increasingly difficult to distinguish between long-term and short-term memory based on the analysis of single data series. Here we investigate the applicability of autoregressive modelling to long-term correlated data. The applicability of AR model is shown in terms of the autocorrelation function and power spectral density.
The paper presents the search of ranging codes based on shortened Kasami and bent sequences. The criterion of minimum multiple access interference (MAI) level in wide range of Doppler shifts is applied.
Sound localization refers to a listener's ability to identify the location or origin of a detected sound in direction and distance. The traditional method of sound localization is aimed at the problem of three-dimensional localization, which requires an array of four or more microphones. Specialized research on two-dimensional sound localization is few. Although microphone arrays are also able to...
In this paper, an improved pitch contour formulation is introduced by modifying the existing pitch contour sinusoidal function. The aim is to convert neutral speech into storytelling speech in Malay Language. Our speech datasets (neutral and storytelling speech) were recorded by a male and a female professional speaker. They contain 116 speech sentences, 1,164 words, and 2,732 syllables. For storytelling...
The paper introduces a novel method for distance estimation based on an OFDM signal combined with the Zadoff-Chu sequences. By exploiting the properties of these sequences, it is possible to evaluate the distance between two active nodes with a very good precision and accuracy. The technique effectiveness is demonstrated by measuring the distance between a single transmitter and a synchronized receiver...
An Android app has been developed to assist in the education of individuals in a science, technology, engineering, and mathematics (STEM) course of study. The Android Reflection Application provides students a means to determine distances to objects while allowing them the ability to manipulate signal envelopes, signal shapes, signal types, and frequency constraints. The convenient and intuitive graphical...
ABSTRACT-This paper introduces an original waveform matching based data-processing method for TOF ranging. The key idea is to decrease measurement error by establishing contact between waveform and distance. The method consists of three steps: defining waveform parameters mathematically, establishing contact between parameters and distance, and deciding the weight of each parameter. This method is...
Social networks are known to form on the basis of homophily, where nodes with some type of similar characteristics are more likely to be connected. Some of the most fundamental human characteristics are reflected by an individual's personality, which represents a persistent disposition governing a human's outlook and approach to diverse situations. While taking into account demographics of age and...
We study a unique behavioral network data set (based on periodic surveys and on electronic logs of dyadic contact via smartphones) collected at the University of Notre Dame. The participants are a sample of members of the entering class of freshmen in the fall of 2011 whose opinions on a wide variety of political and social issues and activities on campus were regularly recorded — at the beginning...
Distance information is useful for satellite constellation. Evaluating the accuracy of spread spectrum receiver under finite bandwidth is still hard and few researches focus on that. In this paper, we build the signal model of DSSS signal under finite bandwidth, and then derive the mathematic form of error function. Furthermore, we propose the error factor, which is decided by bandwidth and early-to-late...
The demands on indoor localization services have grown explosively due to increasing popularity of mobile devices. Though various techniques based on wireless signals have been proposed, the new Bluetooth 4.0 and 4.1 technologies introduce both opportunities and challenges for localization. Like all wireless signals, the fluctuations caused by hardware conditions and environmental dynamics may deteriorate...
Pseudorandom noise (PRN) sequences are used to provide a means to measure the ranging distance between a ground station and a satellite. Satellite Ground Link System (SGLS), Global Positioning System (GPS), and some radars are some of the examples that make use of PRN sequences. PRN ranging also provides a certain level of immunity to narrowband interference. The basic procedure involves transmitting...
The paper presents the search of ranging codes based on shortened minimax binary ensembles. The criterion of minimum multiple access interference (MAI) level in wide range of Doppler shifts is applied. It is shown that compact-spectrum signals have priority in MAI at the fixed time-frequency resource.
Low autocorrelation binary sequences (LABS) play important role in communication and radar applications, due to low aperiodic autocorrelation property. The asymptotic merit factor of LABS has been conjectured by Golay to be 12.32. The minimum energy level of LABS has been proven to be y or, respectively for even or odd sequence length N. In this paper, following the theoretical minimum energy level...
Objective To explore the relationship between the personality and learning performance of medical university students, and check the mediator role of learning burnout. Methods A survey with the scales such as NEO-FFI, learning burnout and learning performance was made on 699 medical university students in grade one and grade two from 4 universities, and 636 subjects were valid. Results Correlation...
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