This article presents an overview on passive drone detection. An SDR-based, portable universal software radio peripheral (USRP) prototype is developed for detection in two scenarios. In the scenario which a communicates with ground controller, cyclostationarity signature of signal and pseudo Doppler principle are employed. For not sending any signal, micro generated by RF exploited identification.

This paper presents a sparse denoising autoencoder (SDAE)-based deep neural network (DNN) for the direction finding (DF) of small unmanned aerial vehicles (UAVs). It is motivated by practical challenges associated with classical DF algorithms such as MUSIC and ESPRIT. The proposed scheme low-complex in sense that phase synchronization mechanism, an antenna calibration analytical model radiation pattern are not essential. Also, method can be implemented using single-channel RF receiver....

Global system for mobile communications (GSM) is one of the most widely used communication standards in world today, which still has a large number users, so it great security significance to identify devices operating GSM network. This paper proposes novel radio frequency fingerprinting (RFF) based device identifications method phones. A differential constellation trace figure (DCTF) physical layer RFF extraction and convolutional neural network (CNN) classification scheme designed...

A direction-of-arrival (DOA) estimation scheme that is immune to phase ambiguity proposed for directional uniform circular array in the context of software defined radio based engineering implementation, where calibration often required multi-channel receiver high-resolution, multi-source DOA algorithms work. The makes use sparse signal representation technique, and robust sense no when implemented by multichannel can achieve single-channel used. To facilitate performance evaluation, a...

This paper is concerned with the throughput and fairness analysis in a downlink WCDMA network. The channel model assumed to include path loss, lognormal shadowing fast Rayleigh fading. scheduling schemes investigated are (i) round robin scheme, (ii) maximum carrier-to-interference ratio (C/I) (iii) proportional fair (iv) instantaneous signal (v) fading-based power scheme. By using an approximation of probability density function C/I, expressions derived, performance comparison among five...

Security issues, such as unsafe operation and terrorist activity have become more critical due to the rising popularization of drones in recent years. To address these drone classification localization techniques desirable. In this paper, we propose a new approach for using micro-Doppler signature. After obtaining signature generated from propeller rotation, dimension reduction is carried out feature extraction. Next, extracted features are fed into four different classifiers. Finally,...

The structures and thermoelectric properties of mCu5Zn3⋅nZn4Sb3 with multiphase coexistence are reported. Rietveld analysis reveals that at least 92.3% wt % β-Zn4Sb3 phase can be obtained only small quantities ZnSb Cu5Zn8 phases precipitated after proper Cu5Zn3 addition. Measurements indicate although the plays a determining role in controlling transport involving Seebeck coefficient, electrical conductivity, thermal impurity crooked riverlike intertwined tree stump morphologies,...

This paper presents new bounds on the Marcum Q-function Q <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> (a, b). First, new, simple, arbitrarily tight, exponential lower zeroth-order modified Bessel function of first kind I xmlns:xlink="http://www.w3.org/1999/xlink">o</sub> (x) and Gaussian Q(x) are derived. Due to their elegant features, these fundamental in own rights. Then, when they applied that is expressed as a l Q(x), various...

This paper is concerned with the error-performance analysis of binary and quadrature differential phase-shift keying detection over nonselective, Rayleigh fading channel combining diversity reception. The channels are independent, but have nonidentical statistics. process in each assumed to an arbitrary Doppler spectrum bandwidth. Both optimum reception suboptimum considered. Results available previously apply only case second-order diversity, require numerical integration for their actual...

A direction-of-arrival (DOA) estimation scheme that is immune to phase ambiguity proposed for directional uniform circular array. The robust, and has the merits no calibration required when implemented by multi-channel receiver can achieve multi-source DOA single-channel used. Via sparse signal representation, validated computer simulations.

A new approach for analysing the error probability of a signal constellation that involves π/2-radian, wedge-shaped decision in additive white Gaussian noise is presented. The result obtained exact closed-form terms Q-function. Applied to 8-QAM, this gives an expression symbol probability.

With the structure of Digital Signal Processor (DSP) application program getting more complex, there is a rise in need for concurrent access to shared resources under multitasking environment. However, task scheduling and synchronization provided by most DSP operating systems quite limited, which can barely meet requirement control access. At present, reader-writer (RW) locks have been wide-spread use many POSIX-compliant real-time provide currency control, but they not be applied without...

The paper presents a combined method for the single channel speech enhancement of noisy signals at very low signal-to-noise ratios, which is based on masking properties human auditory system and power spectral density estimation non-stationary noise. It allows an automatic adaptation in time frequency parametric system, finds best tradeoff between criterion correlated with perception SNR. This leads to significant reduction unnatural structure residual results show that enhanced more...

This paper is concerned with detector design and performance analysis for spectrum sensing of phase-modulated signal in cognitive radio systems. Under the maximum a posteriori probability criterion, optimal which outperforms popular energy derived, its detection false-alarm probabilities that describe receiver operating characteristic (ROC) are analyzed. These obtained as explicit, closed-form expressions, show analytically ROC behavior function various system parameters such signal-to-noise...