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The paper deals with the estimation method of a carrier and time of arrival by chirp-like phase-coded sequence. The developed estimation method of the carrier and time of arrival is suitable for primary synchronization upon signal detection in phase and frequency modulation modems. This method is of less computational complexity relative to the realization of matched filter assembly. To implement...
This paper aims for the transmission of an RGB image mixed with a chaotic signal generated by the Sprott chaotic system which is simulated in Matlab-Simulink. Open-Plus-Closed-Loop is used in order to synchronize the systems from the Sprott's collection, only five cases of Sprott are shown which are known as cases A, B, C, H, and R. These cases were simulated to carry out the transmission of information,...
In this paper, we address the use of multi-layered sliding windows to detect the presence of a wireless network for cognitive radio applications. Although synchronization signals of the Long Term Evolution (LTE) has been used as the reference system, the proposed scheme is generic in principle. Our proposed scheme doesn't require any a priori knowledge of the exact synchronization sequences, so it...
We present an optimal frame timing estimator for OFDM signals that utilizes both cyclic prefix (CP) and pilot-carrier-aided channel estimation. Combining the periodic nature of the embedded pilot signal information with the correlation present in the cyclic prefix allows improved frame timing estimates relative to use of either one. Following a derivation of the ML estimator, a processor diagram is...
In helicopter satellite communications, the periodic blockage of the channel due to the rotor blades degrades the bit error rate (BER) performance. Although time diversity is attractive in order to overcome the periodic blockage, the combining process in the receiver requires the code synchronization. The pre-detection combining is suitable for time diversity because it is superior to the post-detection...
In this paper, as binary modulation schemes, the differential on-off keying (DOOK) system, which can achieve anti-background noise capability and high data transmission efficiency, is considered. In order to solve the synchronization slip, a visible-light framed DOOK system embedding {-1,+1}-synchronization signal pattern is proposed. Moreover, theoretical formulas of detection and false alarm probability...
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...
In this paper, we propose a direct construction of disjoint cyclic perfect Mendelsohn difference family (CP-MDF) from Zeng-Cai-Tang-Yang cyclotomy. As we all know, strictly optimal frequency-hopping sequences (FHSs) are a kind of optimal FHSs which has optimal Hamming auto-correlation for any correlation window. As an application of our disjoint CPMDFs, we present more flexible combinatorial constructions...
The paper presents a new wireless communication system using Chirp Spread Spectrum (CSS) transmission. The applied modulation scheme is extended with Pulse Position Modulation (PPM) to transmit data for multiple mobile terminals simultaneously. The proposed system is a Low-Power Wide-Area Network (LPWAN) providing very reliable and robust transmission, especially for terminals moving with high speeds...
Exploiting correlations in the audio, several works in the past have demonstrated the ability to automatically match and synchronize User Generated Recordings (UGRs) of the same event. Considering a small number of synchronized UGRs, we formulate in this paper simple linear audio mixing approaches to combine the available audio content. We use data from two different public events to perform a comparative...
The problem of search for delay of broadband signals on the basis of code sequences is considered. The problem arises when using long code sequences in conditions of limited signal observation time and high requirements to reliability and synchronization accuracy. In these conditions use of various non-optimal methods and search algorithms, in particular, sequential-parallel search, consecutive algorithms...
A small-cell network (SCN) constructed by splitting a macro-cell into numerous small cells using an active antenna array system is studied. A synchronization signal appropriate for the SCN, virtually generated by a base station (BS) with 3D beamforming, is proposed for efficient handover in SCNs. The virtual cell synchronization signal (VCSS) carries a macro-cell ID (MCID) and virtual- cell ID (VCID)...
A constant-amplitude output signal for the Zadoff-Chu sequence was used for the low complexity MANET transmitter devices to improve safety of autonomous cars. The main goal is to merge the communication block and the obstacle detection block in singular multipurpose device. The article presents the algorithm of using the Zadoff-Chu sequence to establish the initial synchronization for the joint communication...
LTE has several advantages to be investigated as transmitter of opportunity for passive radar in Germany: low carrier frequencies (i.e. low free space attenuation), high bandwidth (i.e. high range resolution) and wide area network (i.e. large availability). Therefore the signal correlation behavior is investigated. Additionally, a signal processing method is proposed for passive radar using LTE. The...
The problem to rectify and optimize distance measures from satellites in GNSS devices has been thoroughly explored in many researches. Instead there is not much information on available procedures to replicate the observed errors. The replication of GNSS errors can, in fact, be useful in many traffic simulation scenarios to test for ITS performances. The purpose of this article is to present cases...
The synchronization of stock price in recent years is the hot topic of corporate finance. In this paper, we use the data of A share listed companies in China in 2010–2015 to study the barrier of separation of two rights (control right and cash flow right) to market information transmission characterized by stock price synchronization. The results show that: firstly, the separation of the two powers...
Both ring-oscillator based clocks and bundled-data designs mitigate the ill effects of process, voltage, and temperature (PVT) variations. They both rely on delay lines which, when made post-silicon tunable, offer the opportunity to add test margin into the design in which the delay line in shipped products is set slower than that which is successfully tested. This paper mathematically analyzes the...
Functional intrinsic brain networks (IBNs) has been widely studied due to its close relationship to different brain functions and diseases. In these studies, linear metrics, e.g., correlation, have been commonly used in identifying brain networks, especially on functional magnetic resonance imaging (fMRI) data. However, nonlinear mechanism is believed to exist in forming brain networks. In the present...
VSF-Network is a neural network model that learns dynamical patterns. It is hybrid neural network combining a chaotic neural network and a hierarchical neural network. The hierarchical neural network part is used for pattern learning. The chaotic neural network part monitors behavior of neurons in the middle layer of the hierarchical neural network. In this paper, two theoretical backgrounds of VSF-Network...
Joint analysis of complex signals is essential for a better understanding of the principles underlying the complex systems dynamics. In our work we studied the mutual dynamics of two Gaussian distributed stochastic processes exhibiting either short-term or long-term correlations. We generated two copies of each surrogate process and applied the amplitude randomization procedure to one of them. We...
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