scholarly journals DIGITAL ANTENNA ARRAYS SIMULATION

2021 ◽  
Vol 6 (3(36)) ◽  
pp. 13-17
Author(s):  
Yuriy Borisovich Nechaev ◽  
Ilya Vladimirovich Peshkov ◽  
Natalia Alexandrovna Fortunova ◽  
Irina Nikolaevna Zaitseva
Keyword(s):  
Simulation Model ◽  
Antenna Array ◽  
Antenna Arrays ◽  
Signal Transmission ◽  
Transmission Systems ◽  
Digital Radio ◽  
Initial Information ◽  
Information Signal ◽  
Broadband Signal ◽  
Radio Systems

The article describes a simulation model of a digital antenna array, which can be used in broadband signal transmission systems under the influence of broadband interference. The initial information signal has a speed of 19200 bit / s for the I and Q stream. It is proved that the signal level after applying the diagramming of a digital antenna array is four times higher than the signal level without its use, which confirms the advantage of digital radio systems.

scholarly journals Feasibility Investigation of SIW Cavity-Backed Patch Antenna Array for Ku Band Applications

2019 ◽  
Vol 9 (7) ◽  
pp. 1271 ◽  
Author(s):  
Onofrio Losito ◽  
Vincenza Portosi ◽  
Giuseppe Venanzoni ◽  
Francesco Bigelli ◽  
Davide Mencarelli ◽  
...  
Keyword(s):  
Antenna Array ◽  
Antenna Arrays ◽  
Patch Antenna ◽  
Satellite Communication ◽  
Feasible Solution ◽  
Microstrip Patch Antenna ◽  
Digital Radio ◽  
Microstrip Patch ◽  
G 13 ◽  
Ku Band

A cavity-backed microstrip patch antenna array was optimized in the Ku band. The backing cavity was designed under each patch antenna of the array in order to increase the bandwidth and minimize the intercoupling among the radiating elements. Substrate integrated waveguide (SIW) technology was employed to fabricate the above-mentioned cavity below the radiating patch. More precisely, four microstrip array antennas, made by 2 × 2, 4 × 4, 8 × 8, and 16 × 16 elements were designed, fabricated, and characterized. The measured maximum gain was G = 13 dBi, G = 18.7 dBi, G = 23.8 dBi, and G = 29.2 dBi, respectively. The performance of the proposed antenna arrays was evaluated in terms of radiation pattern and bandwidth. An extensive feasibility investigation was performed even from the point of different materials/costs in order to state the potential of the engineered antennas in actual applications. The obtained results indicate that a cavity-backed microstrip patch antenna is a feasible solution for broadband digital radio and other satellite communication overall for niche applications.

scholarly journals Possibilities for Advanced Encoding Techniques at Signal Transmission in the Optical Transmission Medium

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Filip Čertík ◽  
Rastislav Róka
Keyword(s):  
Optical Fiber ◽  
Simulation Model ◽  
Optical Transmission ◽  
Signal Transmission ◽  
Optical Signal ◽  
Negative Effects ◽  
Transmission Systems ◽  
High Data ◽  
Modulation Techniques ◽  
Optical Transmission Systems

This paper presents a possible simulation of negative effects in the optical transmission medium and an analysis for the utilization of different signal processing techniques at the optical signal transmission. An attention is focused on the high data rate signal transmission in the optical fiber influenced by linear and nonlinear environmental effects presented by the prepared simulation model. The analysis includes possible utilization of OOK, BPSK, DBPSK, BFSK, QPSK, DQPSK, 8PSK, and 16QAM modulation techniques together with RS, BCH, and LDPC encoding techniques for the signal transmission in the optical fiber. Moreover, the prepared simulation model is compared with real optical transmission systems. In the final part, a comparison of the selected modulation techniques with different encoding techniques and their implementation in real transmission systems is shown.

ПРОСТРАНСТВЕННО–ВРЕМЕННАЯ ОБРАБОТКА СЛОЖНОГО ШИРОКОПОЛОСНОГО СИГНАЛА НА ОСНОВЕ ГАРМОНИЧЕСКОГО РАЗЛОЖЕНИЯ

2020 ◽  
Author(s):  
S.A. Pakhomov ◽  
S.V. Shostak
Keyword(s):  
Antenna Array ◽  
Time Signal ◽  
Angle Of Arrival ◽  
Underwater Acoustic ◽  
Residual Noise ◽  
Information Signal ◽  
Spectrum Shaping ◽  
Broadband Signal ◽  
Unbiased Estimates ◽  
Vector Matrix

Для оценки направления на морской объект рассмотрено формирование пространственно-временногосигнала в приемной эквидистантной линейной антенной решетке в условиях плоского волнового фронта поляакустического давления, создаваемого сложным широкополосным сигналом. Модель формирования спектра информационного сигнала на выходе отдельного гидрофона антенной решетки представлена векторно-матричным уравнением в аддитивной смеси с шумом гидроакустического канала. Для оценивания такого сигнала применены методы линейного оценивания в спектральной области, позволяющие получить несмещенныеоценки с минимальной дисперсией. Найдена матрица весовых коэффициентов, с помощью которой шумовыекомпоненты отдельного гидрофона (приемного канала) приводятся к белому шуму с минимальной дисперсией.При суммировании спектров гидрофонов антенной решетки пространственно-временной сигнал на ее выходе определен с помощью оценок отдельных информационных сигналов гидрофонов и их остаточного шума сразной дисперсией. Минимальное значение дисперсии выходного шума антенной решетки получено на основании ковариационной матрицы остаточного шума. Предлагаемый оптимальный метод оценки направленияприхода сигнала от морского объекта на антенную решетку позволяет отказаться от избыточного числа еелиний задержки при одновременном значительном уменьшении влияния шума гидроакустического канала.The paper considers the estimation of the direction tothe marine objects by dealing with the formation of a spacetimesignal on the receiving equidistant linear antenna arrayin conditions of the flat wavefront of the acoustic pressurefield generated by a complex broadband signal. The modelof spectrum shaping of the information signal at the outputof a separate hydrophone of the antenna array is derived bythe vector-matrix equation in the additive mix with the noiseof the underwater acoustic channel. The estimation of sucha signal was performed by methods of linear evaluation inthe spectral domain, allowing to get unbiased estimates withthe least dispersion. The noise components of each separatehydrophone (receiving channel) are reduced to white noisewith minimal dispersion using the calculated weightingmatrix. The resulting space-time signal at the output of theantenna array obtained by the summing spectrums of all ofthe hydrophones can be determined by the estimation of theseparate information signals of each array element and itsresidual noise with different variance. The minimal value ofthe noise variance at antenna array output was obtained basedon the covariance matrix of the residual noise. The proposedoptimal method of the estimation of angle-of-arrival of thesignal from the remote marine object on the antenna arrayallows substantially decreasing both the number of its delaylines and the influence of the underwater acoustic channelnoise.

scholarly journals Full snapshot reconstruction in hybrid architecture antenna arrays

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Maria Trigka ◽  
Christos Mavrokefalidis ◽  
Kostas Berberidis
Keyword(s):  
Antenna Array ◽  
Antenna Arrays ◽  
Communication Systems ◽  
Linear Array ◽  
Research Work ◽  
Hybrid Architecture ◽  
Angle Of Arrival ◽  
Music Algorithm ◽  
Array Structures ◽  
Signal Sources

AbstractIn the context of this research work, we study the so-called problem of full snapshot reconstruction in hybrid antenna array structures that are utilized in mmWave communication systems. It enables the recovery of the snapshots that would have been obtained if a conventional (non-hybrid) uniform linear antenna array was employed. The problem is considered at the receiver side where the hybrid architecture exploits in a novel way the antenna elements of a uniform linear array. To this end, the recommended scheme is properly designed so as to be applicable to overlapping and non-overlapping architectures. Moreover, the full snapshot recoverability is addressed for two cases, namely for time-varying and constant signal sources. Simulation results are also presented to illustrate the consistency between the theoretically predicted behaviors and the simulated results, and the performance of the proposed scheme in terms angle-of-arrival estimation, when compared to the conventional MUSIC algorithm and a recently proposed hybrid version of MUSIC (H-MUSIC).

scholarly journals A Graphene-Assembled Film Based MIMO Antenna Array with High Isolation for 5G Wireless Communication

2021 ◽  
Vol 11 (5) ◽  
pp. 2382
Author(s):  
Rongguo Song ◽  
Xiaoxiao Chen ◽  
Shaoqiu Jiang ◽  
Zelong Hu ◽  
Tianye Liu ◽  
...  
Keyword(s):  
Antenna Array ◽  
Antenna Arrays ◽  
Multiple Input Multiple Output ◽  
Frequency Selective Surface ◽  
Antenna System ◽  
Antenna Element ◽  
Mimo Antenna ◽  
High Isolation ◽  
Input Multiple Output ◽  
Alternative Material

With the development of 5G, Internet of Things, and smart home technologies, miniaturized and compact multi-antenna systems and multiple-input multiple-output (MIMO) antenna arrays have attracted increasing attention. Reducing the coupling between antenna elements is essential to improving the performance of such MIMO antenna system. In this work, we proposed a graphene-assembled, as an alternative material rather than metal, film-based MIMO antenna array with high isolation for 5G application. The isolation of the antenna element is improved by a graphene assembly film (GAF) frequency selective surface and isolation strip. It is shown that the GAF antenna element operated at 3.5 GHz has the realized gain of 2.87 dBi. The addition of the decoupling structure improves the isolation of the MIMO antenna array to more than 10 dB and corrects the antenna radiation pattern and operating frequency. The isolation between antenna elements with an interval of 0.4λ is above 25 dB. All experimental results show that the GAF antenna and decoupling structure are efficient devices for 5G mobile communication.

Back-to-back Double Antenna Array with 360° Coverage Simulation Model

2019 ◽  
Author(s):  
Bruno A. Kleinau ◽  
Saulo R. B. de Queiroz ◽  
Ricardo J. de F. P. V. Almeida ◽  
Elias M. F. de Oliveira ◽  
Marcos T. de Melo
Keyword(s):  
Simulation Model ◽  
Antenna Array

scholarly journals Null Steering in Failed Antenna Arrays

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Om Prakash Acharya ◽  
Amalendu Patnaik ◽  
Sachendra N. Sinha
Keyword(s):  
Antenna Array ◽  
Antenna Arrays ◽  
Side Lobe ◽  
Side Lobe Level ◽  
Correction Procedure ◽  
Swarm Optimization ◽  
Array Pattern ◽  
Null Steering ◽  
Simulation Results ◽  
Pattern Simulation

Antenna array pattern nulling is desirable in order to suppress the interfering signals. But in large antenna arrays, there is always a possibility of failure of some elements, which may degrade the radiation pattern with an increase in side lobe level (SLL) and removal of the nulls from desired position. In this paper a correction procedure is introduced based on Particle Swarm Optimization (PSO) which maintains the nulling performance of the failed antenna array. Considering the faulty elements as nonradiating elements, PSO reoptimizes the weights of the remaining radiating elements to reshape the pattern. Simulation results for a Chebyshev array with imposed single, multiple, and broad nulls with failed antenna array are presented.

scholarly journals The features of the use of the waveguide radiators in smart antenna systems

2018 ◽  
Vol 26 (1) ◽  
pp. 89-92
Author(s):  
V. M. Morozov ◽  
V. I. Magro
Keyword(s):  
Integral Equation ◽  
Antenna Array ◽  
Antenna Arrays ◽  
Smart Antenna ◽  
Integral Equation Method ◽  
Thin Plates ◽  
Coupling Region ◽  
Five Elements ◽  
Antenna Systems ◽  
Selection Of

The features of the use of finite waveguide antenna arrays in the structure of modern smart antenna systems are considered. The paper deals with the problem of diffraction of an electromagnetic wave on a finite waveguide antenna array scanning in the E-plane. Antenna array consists of five radiating elements. The open ends of the waveguides are surrounded by a metal screen. The resonator coupling region was chosen as matching elements. The solution of the problem is carried out by the integral equation method on the basis of the selection of overlapping regions. The problem reduces to solving the Fredholm integral equation of the second kind. An array of infinitely thin plates and that of waveguides with a finite wall thickness are considered. The main regularities for choosing the optimal geometric dimensions of the antenna array are established. Studies were carried out for arrays with a number of elements from five to fifteen. The analysis of edge effects in the final antenna array is carried out. It is shown that the introduction of a resonator region into a five-element lattice makes it possible to expand the sector of the radiation angles and avoid the effect of blinding. It is shown that this statement is valid not only for five-element lattices, but also for arrays with a large number of radiating elements. The radiation patterns are calculated. The  coefficients of mutual coupling in an array with five elements are investigated. General recommendations for choosing optimal sizes of the resonator coupling region of radiators are considered.

scholarly journals INFORMATION MODEL OF TURBODRILLING USING THE TELEMETRY SYSTEM BASED ON THE ACCOUNTING OF THE SOUND ENERGY CHARACTERISTICS

2015 ◽  
pp. 26-29
Author(s):  
V. I. Kolesov ◽  
Yu. A. Savinyh ◽  
G. A. Hmara
Keyword(s):  
Simulation Model ◽  
Target Function ◽  
Information Model ◽  
Telemetry System ◽  
Energy Characteristics ◽  
Sound Energy ◽  
Information Signal

The information model of turbodrilling using the telemetry system based on the accounting of the sound energy characteristics was developed and studied. The sources of the information signal and noise were identified. A target function of turbodrilling control - minimization of the process sound amplitude - was obtained. The information model was made a basis for development of the simulation model of turbodrilling control by the sound energy characteristics

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