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Video leaking signal detection is an important part of TEMPEST, which is the technologies research focus on the investigations and studies of compromising emanations. A novel video leaking signal detection algorithm based on spectral centroid has been developed. Using the property that spectral centroid can accurately identify the signal energy center in frequency domain, the proposed algorithm can...
In 3GPP Long Term Evolution (LTE) system, cell search must be first performed to allow the connection between the user equipment and the serving cell. In this paper, we investigate sector search, which is a part of the cell identifier, as well as timing synchronization based on the standardized Primary Synchronization Signal (PSS) generated from known Zadoff-Chu sequences. To this aim, an initial...
The study of the paper concerns with the timing and synchronization problems in the impulse radio-ultra wideband (IR-UWB) positioning system. A novel synchronization algorithm based on two-stage enveloping method to improve the conventional sliding correlation performance is proposed. The correlator output is processed by two-stage enveloping firstly, then the fine synchronization interval is determined...
The chaos signal has three characters that aperiodicity, sensitivity to initial conditions and boundedness, which obtained fruitful results both in secure communication and radar territory. The idea that applying continuous chaos signal to aerospace telemetry, tracking and command is proposed, moreover, the theoretical scheme is established and the merits of the proposed methods are pointed out. Driven...
The aim of the article is presenting what kind of influence an appropriate preparation of entry data in digital image processing has got upon the final results. The authors have presented it on the basis of lack of synchronization between entry data and its influence on the quality criterion Universal Image Quality Index "Q". In the article an algorithm based on correlation has been proposed...
Modern Fast Frequency Hopping (FFH) systems generally use the sliding correlation scheme and the matched filter scheme which both have the best anti-jamming performance. However, the sliding correlation scheme converges too slowly and the matched filter scheme occupies too much hardware resource. An improved acquisition method was developed. Compared with the former two methods, the new method which...
A new preamble structure is proposed for Narrowband Power Line Communication (NB-PLC) system, and therefore a corresponding timing estimator with interval detection and pattern matching is put forward. In the new estimator, firstly the received signals are conducted cross-correlation with the preamble in the transmitter, then the cross-correlation values are obtained and divided into several groups...
Multi-mode and multi-standard connectivity has become a necessity for portable communication systems. A convenient architectural solution is to build flexible systems that can be reprogrammed to meet requirements of multiple standards. One of the major issues in this context is the resource overhead required by programmability. In particular, in the latest VLSI technology nodes, energy consumption...
Understanding the future transportation infrastructure performance demands a smart Cyber-Physical Systems (CPS) approach integrating heterogeneous sensors, versatile computing systems, and mobile agents. However, due to sensor versatility and computing intricacy, designing such systems faces challenges of immense complexity in mobile sensor fusion, big data handling, system scalability, and integration...
Most of the existed methods for steady-state visual evoked potential (SSVEP) recognition require a specified time window length (TWL) to estimate the dominant frequency components in EEG signals. Typically, the TWL is manually predetermined and then fixed during running of the SSVEP-based brain-computer interface (BCI), which may not give the optimal information transfer rate (ITR). This study proposes...
In this paper we propose new Zadoff-Chu (ZC) based synchronization sequences suitable for future broadcast system preambles. While maintaining the same overall structure and length as in the DVB-T2 P1, we replace the synchronization mechanism by a particular combination of ZC sequences capable of carrying one or more signaling bits. We will present the design methodology, the possible ZC constructions...
Super-regenerative receivers (SRR) are known for their ultra-low power (ULP) consumption. However, its wide frequency selectivity seriously degrades performance especially in the presence of interference. An attractive approach to address this problem is by lowering the quench rate of the SRR to the modulation rate. However, this brings in uncertainty due to lack of oversamples and leads to the timing...
Carrier frequency offset (CFO) estimation must have sufficient precision for orthogonal frequency division multiplexing (OFDM) systems due to its sensibility to orthogonality between sub-carriers, especially for high rate OFDM transmission with narrow sub-carrier spacing. In time domain synchronous OFDM (TDS-OFDM), time domain pseudo-noise (PN) sequences are inserted between adjacent data blocks as...
This paper presents a cross correlation based synchronization architecture between the clock of the receiver and the transmitter for ultra-wideband radio systems. The designed architecture is based on M-sequence signals instead of the conventional impulse signals. The M-sequence generator and the analog correlation circuit are fabricated on chip using a low cost 0.25µm 95GHz fmax SiGe-HBT-BiCMOS process...
The auto-correlation based coarse symbol timing scheme yields good correlation timing-metric for wireless orthogonal frequency division multiplexing (OFDM) systems under independent Rayleigh fading channels. However, it generates a plateau in its timing-metric due to the structure of the preamble added with cyclic prefix (CP). Inherently, the mean square error (MSE) performance of a coarse symbol...
For a connected network, consensus based algorithms guarantee that local estimates are iteratively shared and refined among neighbors to reach the same weighted average on all nodes. Parameter estimation for linear models are common problems where average consensus are routinely adopted to mimic a centralized approach without the need of any fusion center. Convergence speed, accuracy and the amount...
Robust high data rate have several challenges in mobile communication, because data transmission experience higher delay spread and the link is less reliable. Orthogonal Frequency Division Multiplexing (OFDM) is suitable modulation technique for higher delay spread applications. However the performance of OFDM is very sensitive against time synchronization error. In this research, we evaluate the...
Many studies analyze the encrypted transmission using the synchronization of chaotic signals. This requires the exchange of an analog synchronization signal, which almost always is a state of the chaotic generator. However, very few different chaotic structures are used for this purpose, still. The uniqueness of their dynamics allows the identification of these structures by simple autocorrelation...
Current fusion devices consist of multiple diagnostics and hundreds or even thousands of signals. This situation forces on multiple occasions to use distributed data acquisition systems as the best approach. In this type of distributed systems, one of the most important issues is the synchronization between signals, so that it is possible to have a temporal correlation as accurate as possible between...
A new coarse synchronization scheme for 3rd Generation Partnership Project Long Term Evolution (3GPP-LTE) is proposed. Existing coarse synchronization schemes based on central symmetry utilize either primary synchronization signal (PSS) and secondary synchronization signal (SSS) to fulfill initial timing synchronization. Though these two schemes perform well with relative low complexity, they can...
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