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    Wyświetlanie 1-13 z 13
    Tytuł:
    Transmit Diversity in the Downlink for the TETRA-TEDS System
    Autorzy:
    Rutkowski, D. A.
    Możdżonek, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/308120.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    multiple-input multiple-output (MIMO)
    TETRA Enhanced Data System
    Opis:
    In the paper a proposal for the improvement of performance for the TETRA Enhanced Data System (TEDS) employing transmit diversity based on two antennas in the downlink is described. The key idea of the considerations relies on using the space-frequency coding algorithm. The proposal described required some relatively simple changes to the existing TEDS’s Single Input Single Output (SISO) interface but the original number of payload and signaling symbols in the normal downlink burst is preserved. The simulation results obtained indicate a significant improvement in performance. The Eb/No parameter could be reduced from 5 to 8 dB with respect to Frame Error Rate (FER), compared to a single antenna transmission for the same FER = 10−3.
    Źródło:
    Journal of Telecommunications and Information Technology; 2014, 1; 49-53
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of an LSTM-based NOMA Detector Over Time Selective Nakagami-m Fading Channel Conditions
    Autorzy:
    Shankar, Ravi
    Bangare, Jyoti L.
    Kumar, Ajay
    Gupta, Sandeep
    Mehraj, Haider
    Kulkarni, Shriram S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2142313.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    deep learning
    DL
    multiple-input multiple-output
    MIMO
    non-orthogonal multiple access
    NOMA
    orthogonal multiple access
    OMA
    Opis:
    This work examines the efficacy of deep learning (DL) based non-orthogonal multiple access (NOMA) receivers in vehicular communications (VC). Analytical formulations for the outage probability (OP), symbol error rate (SER), and ergodic sum rate for the researched vehicle networks are established Rusing i.i.d. Nakagami-m fading links. Standard receivers, such as least square (LS) and minimum mean square error (MMSE), are outperformed by the stacked long-short term memory (S-LSTM) based DL-NOMA receiver. Under real time propagation circumstances, including the cyclic prefix (CP) and clipping distortion, the simulation curves compare the performance of MMSE and LS receivers with that of the DL-NOMA receiver. According to numerical statistics, NOMA outperforms conventional orthogonal multiple access (OMA) by roughly 20% and has a high sum rate when considering i.i.d. fading links.
    Źródło:
    Journal of Telecommunications and Information Technology; 2022, 3; 17--24
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Capon-like method for direction of arrival estimation using TDM MIMO radar
    Autorzy:
    Ślesicka, Anna
    Kawalec, Adam
    Ślesicki, Błażej
    Powiązania:
    https://bibliotekanauki.pl/articles/27311751.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    direction of arrival measurement
    Capon algorithm
    multiple-input multiple-output radar
    time-division multiplexing
    signal processing
    Opis:
    This paper presents a novel measurement method and briefly discusses the basic properties of direction of arrival (DoA) measurement in a multiple-input multiple-output (MIMO) radar system by using orthogonality with time-division multiplexing (TDM), where only one transmitting antenna element is active in each time slot. This paper presents the mathematical model of the TDM-MIMO radar operating at 10 GHz, transmitting a string of pulses, the method of transmitting and receiving the signal, and the method of measuring the angle of arrival of the signal based on the use of the Capon algorithm and its modifications. Finally, the correctness of the theory, algorithm and method of measuring the direction of arrival of the signal is verified by experimental simulation. The work discussed in this paper is of great significance to practically demonstrate the capabilities of the TDM MIMO radar sensor in practical implementations like reconnaissance and electronic warfare systems.
    Źródło:
    Metrology and Measurement Systems; 2023, 30, 3; 481--497
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modulation-Mode Assignment for SVD-assisted Downlink Multiuser MIMO Transmission Schemes with Iterative Detection
    Autorzy:
    Ahrens, A.
    Benavente-Peces, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/226541.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple-input multiple-output system
    singular value decomposition
    bit allocation
    power allocation
    wireless transmission
    multiuser transmission
    Opis:
    Since the capacity of multiple-input multiple-output (MIMO) systems increases linearly with the minimum number of antennas at both, the transmitter as well as the receiver side, MIMO systems have attracted a lot of attention for both frequency and non-frequency selective channels and reached a state of maturity. By contrast, MIMO-aided multiple-user systems require substantial further research. In comparison to zero-forcing (ZF) multiuser transmission techniques, where all users are treated jointly, the investigated singular value decomposition (SVD) assisted DL multiuser MIMO solution takes the individual user's channel characteristics into account. In analogy to bit-interleaved coded irregular modulation, we introduce a MIMO-BICM scheme, where different user-specific signal constellations and mapping arrangement were used within a single codeword. Extrinsic information transfer (EXIT) charts are used for analyzing and optimizing the convergence behaviour of the iterative demapping and decoding. Our results show that in order to achieve the best bit-error rate, not necessarily all user-specific MIMO layers have to be activated.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 1; 127-134
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modulation-Mode Assignment in SVD-Aided Downlink Multiuser MIMO-OFDM Systems
    Autorzy:
    Aust, S.
    Ahrens, A.
    Benavente-Peces, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/227057.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple-input multiple-output system
    orthogonal frequency division multiplexing
    singular value decomposition
    bit allocation
    wireless transmission
    Opis:
    Multicarrier transmission such as OFDM (orthogonal frequency division multiplexing) is an established technique for radio transmission systems and it can be considered as a promising approach for next generation wireless systems. However, in order to comply with the demand on increasing available data rates in particular in wireless technologies, systems with multiple transmit and receive antennas, also called MIMO (multiple-input multiple-output) systems, have become indispensable for future generations of wireless systems. Due to the strongly increasing demand in high-data rate transmission systems, frequency non-selective MIMO links have reached a state of maturity and frequency selective MIMO links are in the focus of interest. In this field, the combination of MIMO transmission and OFDM can be considered as an essential part of fulfilling the requirements of future generations of wireless systems. However, single-user scenarios have reached a state of maturity. By contrast multiple users' scenarios require substantial further research, where in comparison to ZF (zero-forcing) multiuser transmission techniques, the individual user's channel characteristics are taken into consideration in this contribution. The performed joint optimization of the number of activated MIMO layers and the number of transmitted bits per subcarrier shows that not necessarily all user-specific MIMO layers per subcarrier have to be activated in order to minimize the overall BER under the constraint of a given fixed data throughput.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 4; 459-464
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of VBLAST Equalization Technique for Underwater Acoustic Communications
    Autorzy:
    Pranitha, B.
    Anjaneyulu, L.
    Minh, Hoa
    Aslam, Nauman
    Kumar, Sandeep V.
    Powiązania:
    https://bibliotekanauki.pl/articles/227284.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    underwater acoustic communication (UWAC)
    multiple input multiple output (MIMO)
    zero-forcing (ZF)
    vertical-Bell laboratories layered space-time (VBLAST)
    Opis:
    Underwater Acoustic Communications (UWAC) is an emerging technology in the field of underwater communications, and it is challenging because of the signal attenuation of the sound waves. Multiple Input and Multiple- Output (MIMO) is introduced in UWAC because of its support in enhancing the data throughput even under the conditions of interference, signal fading, and multipath. The paper presents the concept and analysis of 2 × 2 MIMO UWAC systems that uses a 4 - QAM spatial modulation scheme thus minimizing the decoding complexity and overcoming the Inter Channel Interference (IChI). Bit Error Rate (BER) investigation is carried out over different link distances under acoustic Line of Sight (LOS). The utilization of Zero Forcing (ZF) and Vertical-Bell Laboratories Layered Space-Time (VBLAST) equalizers, which estimates the transmitted data proves a success of removing Inter Symbol Interference (ISI). The ISI caused due to multipath effect and scattering in UWAC can be reduced by iterative process considered in VBLAST. A study is made on how the distance between the transmitter and the receiver and the Doppler Effect has its impact on the performance of the system.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 2; 331-337
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stanowisko laboratoryjne do badania wielowymiarowych algorytmów regulacji
    Laboratory stand for the study of multivariable control algorithms
    Autorzy:
    Wojtulewicz, A.
    Chaber, P.
    Ławryńczuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/274995.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    regulacja predykcyjna
    procesy wielowymiarowe
    systemy wbudowane
    mikroprocesory
    układy FPGA
    predictive control
    multiple-input multiple-output processes
    embedded systems
    microprocessors
    FPGAs
    Opis:
    W pracy opisano projekt i realizację stanowiska laboratoryjnego do testowania algorytmów regulacji. Przedstawiono budowę mechaniczną oraz elektroniczną. Omówiono funkcje programowe umożliwiające sterowanie procesem. Podkreślono uniwersalność stanowiska, która polega na szerokich możliwościach konfiguracji, gdyż można badać prosty proces jednowymiarowy oraz skomplikowane procesy wielowymiarowe. Opisano możliwości zastosowania stanowiska, w szczególności do testowania algorytmów regulacji zaimplementowanych w systemach wbudowanych, wykorzystujących mikroprocesory, układy FPGA oraz sterowniki PLC. Omówiono przykład regulacji procesu za pomocą algorytmu regulacji predykcyjnej zaimplementowanego na mikroprocesorze.
    The article describes the design and implementation of a laboratory test-bench which may be used to evaluate control algorithms. Mechanical and electronic details are presented. The software features that allow to control the test-bench are discussed. The test-bench is very flexible since it may be easily configured to act as a single-input single-output process and as a number of complicated multiple-input multiple-output processes. Existing possibilities of development of control algorithms implemented on embedded systems based on microprocessors, FPGAs and PLCs are discussed. Finally, an example implementation of a model predictive control algorithm on a microprocessor is detailed.
    Źródło:
    Pomiary Automatyka Robotyka; 2015, 19, 4; 15-20
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Analysis of Channel Estimation Techniques in SISO, MISO and MIMO Systems
    Autorzy:
    Obinna, O.
    Kennedy, O.
    Osemwegie, O.
    Nsikan, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/226922.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple-input multiple-output (MIMO)
    multiple-input single output (MISO)
    single input single output (SISO)
    least square estimation (L.S)
    minimum mean squared error (MMSE) estimators
    mean squared error (MSE)
    bit error rate (BER)
    Opis:
    The ever-growing need for high data rate, bandwidth efficiency, reliability, less complexity and less power consumption in our communication systems is on the increase. Modern techniques have to be developed and put in place to meet these requirements. Research has shown, that compared to conventional Single Input Single Output (SISO) systems, Multiple-Input Single Output (MISO), and Multiple-Input Multiple-Output (MIMO) can actually increase the data rate of a communication system, without actually requiring more transmit power or bandwidth. This paper aims at the investigation of the existing channel estimation techniques. Based on the pilot arrangement, the block type and comb type are compared, employing the Least Square estimation (L.S) and Minimum Mean Squared Error (MMSE) estimators. Pilots occupy bandwidth, minimizing the number of pilots used to estimate the channel, in order to allow for more bandwidth utilization for data transmission, without compromising the accuracy of the estimates is taken into consideration. Various channel interpolation techniques and pilot-data insertion ratio are investigated, simulated and compared, to determine the best performance technique with less complexity and minimum power consumption. As performance measures, the Mean Squared Error (MSE) and Bit Error Rate (BER) as a function of Signal to Noise power Ratio (SNR) of the different channel estimation techniques are plotted, in order to identify the technique with the most optimal performance. The complexity and energy efficiency of the techniques are also investigated. The system modelling and simulations are carried out using Matlab simulation package. The MIMO gives the optimum performance, followed by the MISO and SISO. This is as a result of the diversity and multiplexing gain experienced in the multiple antenna techniques using the STBC.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 3; 299-304
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FPGA Implementation of Sphere Detector for Spatial Multiplexing MIMO System
    Autorzy:
    Mohamed, Asma
    Zekry, Abdel Halim
    Ibrahim, Reem
    Powiązania:
    https://bibliotekanauki.pl/articles/963839.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple input multiple output (MIMO)
    Spatial Multiplexing(SM)
    zero-forcing (ZF)
    Minimum Mean Square Estimator (MMSE)
    Sorted QR Decomposition (SQRD)
    Sphere Decoder (SD)
    Opis:
    Multiple Input Multiple Output (MIMO (techniques use multiple antennas at both transmitter and receiver for increasing the channel reliability and enhancing the spectral efficiency of wireless communication system.MIMO Spatial Multiplexing (SM) is a technology that can increase the channel capacity without additional spectral resources. The implementation of MIMO detection techniques become a difficult mission as the computational complexity increases with the number of transmitting antenna and constellation size. So designing detection techniques that can recover transmitted signals from Spatial Multiplexing (SM) MIMO with reduced complexity and high performance is challenging. In this survey, the general model of MIMO communication system is presented in addition to multiple MIMO Spatial Multiplexing (SM) detection techniques. These detection techniques are divided into different categories, such as linear detection, Non-linear detection and tree-search detection. Detailed discussions on the advantages and disadvantages of each detection algorithm are introduced. Hardware implementation of Sphere Decoder (SD) algorithm using VHDL/FPGA is also presented.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 2; 245-252
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of MIMO system over fast fading channels
    Modelowanie systemów MIMO w środowisku zaników szybkich
    Autorzy:
    Pawelec, J.
    Krawczyk, Z.
    Kosmowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/251812.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Naukowo-Wydawniczy TTS
    Tematy:
    MIMO system
    multiple input multiple output
    Alamouti
    fast fading channel
    SISO systems
    Monte Carlo method
    system MIMO
    środowisko zaników szybkich
    SISO
    metoda Monte Carlo
    Opis:
    Two models of the Alamouti multiple input – multiple output (MIMO) system have been formed: the analytical and simulation one. The first model is simple and it reflects the quasi-static Rayleigh fading phenomena, while the second one is advanced and it expresses the fast fading effects. The results of analysis and simulations show that the Alamouti MIMO architecture significantly over performs the SISO systems (the SNR gain ~20 dB), but mainly within the quasi-static environment. In mobile conditions this gain and/or the overall system capacity under go a sharp decline.
    W referacie poddano eksperymentom symulacyjnym dwa modele MIMO Almaoutiego. Model funkcjonujący w warunkach quasi-statycznych zaników Rayleigha oraz w warunkach zaników szybkich Nakagami’ego. Dokonano oszacowania jaki jest rzeczywisty zysk zastosowania MIMO względem systemu jednokanałowego SISO. W modelowaniu wykorzystano Metodę Monte Carlo.
    Źródło:
    TTS Technika Transportu Szynowego; 2012, 9; 285-290, CD
    1232-3829
    2543-5728
    Pojawia się w:
    TTS Technika Transportu Szynowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ship Course Following and Course Keeping in Restricted Waters Based on Model Predictive Control
    Autorzy:
    Liu, H.
    Ma, N.
    Gu, X. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116264.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Ship Movement, Multiple-Input Multiple-Output (MIMO)
    Very Large Crude Carrier (VLCC)
    Model Predictive Control (MPC)
    Linear Quadratic Regulator (LQR)
    course
    restricted waters
    safety at sea
    Opis:
    Ship navigation safety in restricted water areas is of great concern to crew members, because ships sailing in close proximity to banks are significantly affected by the so-called ship-bank interaction. The purpose of this paper is to apply the optimal control theory to help helmsmen adjust ships’ course and maintain the target course in restricted waters. To achieve this objective, the motion of a very large crude carrier (VLCC) close to a bank is modeled with the linear equations of manoeuvring and the influence of bank effect on the ship hydrodynamic force is considered in the model. State-space framework is cast in a Multiple-Input Multiple-Output (MIMO) system, where the offset-free model predictive control (MPC) is designed for course following and the linear quadratic regulator (LQR) is used for course keeping. Simulation results show that the control methods effectively work in ship course following and course keeping with varying ship-bank distances and water depths. The advantage of adopting speed variation as the second control input is obvious.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 2; 305-312
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New Diminutive Wide-band MIMO Antenna with Frequency Agile Features for 4G and 5G Diverse Wireless Applications
    Autorzy:
    Mudda, Shivleela
    K M, Gayathri
    Mallikarjun, M
    Powiązania:
    https://bibliotekanauki.pl/articles/27311969.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Diversity gain (DG)
    Defective ground structure (DGS)
    Fractional bandwidth (FBW)
    ITU (International Telecommunication Union)
    INSAT
    Frequency Reconfigurable antenna (FRA)
    Multiple input multiple output (MIMO)
    mutual coupling
    isolation
    5G
    Envelope correlation coefficient (ECC)
    Opis:
    This paper demonstrates a low-profile, wide-band, two-element, frequency-reconfigurable MIMO antenna that is suitable for diverse wireless applications of 4G and 5G such as WLAN/Bluetooth (2.4–2.5 GHz), WLAN (2.4–2.484 GHz, 5.15– 5.35 GHz, and 5.725–5.825 GHz), WiMAX (3.3–3.69 GHz and 5.25–5.85 GHz), Sub6GHz band proposed for 5G (3.4–3.6 GHz, 3.6-3.8GHz and 4.4–4.99 GHz), INSAT and satellite X-band(6 to 9.6 GHz). Proposed MIMO favour effortless switching between multiple bands ranging from 2.2 to 9.4 GHz without causing any interference. Both antenna elements in a MIMO array are made up of a single module comprised of a slot-loaded patch and a defective structured ground. Two PIN diodes are placed in the preset position of the ground defect to achieve frequencyreconfigurable qualities. The suggested MIMO antenna has a size of 62 ×25 ×1.5 mm3. Previous reconfigurable MIMO designs improved isolation using a meander line resonator, faulty ground structures, or self-isolation approaches. To attain the isolation requirements of modern devices, stub approach is introduced in proposed design. Without use of stub, simulated isolation is 15dB. The addition of a stub improved isolation even more. At six resonances, measured isolation is greater than 18 dB, the computed correlation coefficient is below 0.0065, and diversity gain is over 9.8 dB.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 3; 439--448
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction control systems in marine applications
    Autorzy:
    Gierusz, W.
    Miller, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/117282.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    control system
    marine applications
    ship motion
    automatic system
    Model Predictive Control (MPC)
    multiple input
    Multiple Output (MIMO)
    Model Predictive Heuristic Control (MPHC)
    Generalized Predictive Control (GPC)
    Opis:
    The paper presents one of the modern control methods used for steering of the ship motion. The different automatic systems used to navigate the vessels are described at the beginning. Next, prediction control methodology is presented and multidimensional MPC regulator applied to steering of the training ship is shown as a technical product. Tests results from the real-time experiments with the mentioned controller are presented at the end of the article.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 361-366
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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