Temat: MIMO - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Wpływ zaników na efektywność systemów ict w transporcie drogowym
Effect of fading on efficiency ict systems in road transport
Autorzy:: Krawczyk, Z.
Luft, M.
Powiązania:: https://bibliotekanauki.pl/articles/252228.pdf
Data publikacji:: 2015
Wydawca:: Instytut Naukowo-Wydawniczy TTS
Tematy:: MIMO
radio
sygnał
ruch drogowy
signal
road traffic
Opis:: W referacie poruszono problemy związane z ograniczeniem wpływu zaników na sygnały radiowe w systemach MIMO . Wskazano na zjawiska niekorzystne takie jak: korelacja miedzykanałowa, efekt nieredukowalnej stopy błędów (floor effect) występujące przy stosowaniu systemów o dywersyfikacji przestrzennej. Zamieszczono wyniki badań symulacyjnych dotyczących stosowanych algorytmów odbioru typu: ZF, ML, MMSE, MMST.
The article analyses problems of influence of faiding over ICT systems (wireless communication, mainly- MIMO . The models of channel under Rayleigh and Nakagami faiding conditions is studied in detail. The recived’s algorithms as ZF, ML, MMSE, MLST are considered over adaptation MIMO 2x2, 2x3 systems. The results of the analysis are encouraging.
Źródło:: TTS Technika Transportu Szynowego; 2015, 12; 2670-2673
1232-3829
2543-5728
Pojawia się w:: TTS Technika Transportu Szynowego
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Transmitter diversity antenna selection techniques for wireless channels utilizing differential space-time block codes
Autorzy:: Tran, L. C.
Wysocki, T. A.
Mertins, A.
Seberry, J.
Powiązania:: https://bibliotekanauki.pl/articles/309431.pdf
Data publikacji:: 2006
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: differential space-time modulation
differential space-time block codes
diversity antenna selection
MIMO system
Opis:: The paper deals with transmitter diversity antenna selection techniques (ASTs) for wireless channels utilizing differential space-time block codes (DSTBCs). The proposed ASTs tend to maximize the signal-to-noise ratio (SNR) of those channels. Particularly, we propose here the so-called general (M,N;K) AST/DSTBC scheme for such channels. Then, based on this AST, we propose two modified ASTs which are more amenable to practical implementation, namely the restricted (M,N;K) AST/DSTBC scheme and the (N + —N,N;K) AST/DSTBC scheme. The restricted (M,N;K) AST/DSTBC scheme provides relatively good bit error performance using only one feedback bit for transmission diversity purpose, while the (N+ —N,N;K) AST/DSTBC scheme shortens the time required to process feedback information. These techniques remarkably improve bit error rate (BER) performance of wireless channels using DSTBCs with a limited number (typically 1 or 2) of training symbols per each coherent duration of the channel. Simulations show that the proposed AST/DSTBC schemes outperform the DSTBCs without antenna selection even with only 1 training symbol.
Źródło:: Journal of Telecommunications and Information Technology; 2006, 2; 79-96
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

Tytuł:: Transient model of heat pump cycle
Autorzy:: Matysko, R.
Powiązania:: https://bibliotekanauki.pl/articles/95327.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: heat pump
transient model
refrigeration cycle
MIMO controller
pompa ciepła
model przejściowy
obieg chłodniczy
sterowanie MIMO
Opis:: This paper introduce a transient model of the propane heat pump cycle. The heat pump cycle model includes: a compressor model, a condenser model in lumped parameters, an evaporator model in lumped parameters, an expansion valve model, a heat source model (cooling chamber), a PID control system for heat recovery from superheated refrigerant vapour. The model allows estimate inertia of the heat pump cycle with the system of the heat recovery from superheated propane vapor. The presented theoretical model can determine unsteady and steady state conditions of the different subsystems in the heat pump cycle (condenser, evaporator, compressor). The article presents the results of calculations and determines the time of reaching steady states of the key systems of the heat pump system. The article also presents (in a graphical form) the behavior of the system where the setting was changed after reaching the steady state after 2000s from 50kW to 40kW at the thermal load of the additional heat recovery exchanger.
Źródło:: Journal of Mechanical and Energy Engineering; 2018, 2, 2; 139-146
2544-0780
2544-1671
Pojawia się w:: Journal of Mechanical and Energy Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Time-shifted Pilot-based Scheduling with Adaptive Optimization for Pilot Contamination Reduction in Massive MIMO
Autorzy:: Kumar, Ambala Pradeep
Srinivasulu, Tadisetty
Powiązania:: https://bibliotekanauki.pl/articles/1839309.pdf
Data publikacji:: 2020
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: massive MIMO
pilot contamination
sparse FCM
time-shifted pilot scheduling
user grouping
Opis:: Massive multiple-input multiple-output (MIMO) is considered to be an emerging technique in wireless communication systems, as it offers the ability to boost channel capacity and spectral efficiency. However, a massive MIMO system requires huge base station (BS) antennas to handle users and suffers from inter-cell interference that leads to pilot contamination. To cope with this, time-shifted pilots are devised for avoiding interference between cells, by rearranging the order of transmitting pilots in different cells. In this paper, an adaptive-elephant-based spider monkey optimization (adaptive ESMO) mechanism is employed for time-shifted optimal pilot scheduling in a massive MIMO system. Here, user grouping is performed with the sparse fuzzy c-means (Sparse FCM) algorithm, grouping users based on such parameters as large-scale fading factor, SINR, and user distance. Here, the user grouping approach prevents inappropriate grouping of users, thus enabling effective grouping, even under the worst conditions in which the channel operates. Finally, optimal time-shifted scheduling of the pilot is performed using the proposed adaptive ESMO concept designed by incorporating adaptive tuning parameters. The efficiency of the adaptive ESMO approach is evaluated and reveals superior performance with the highest achievable uplink rate of 43.084 bps/Hz, the highest SINR of 132.9 dB, and maximum throughput of 2.633 Mbps.
Źródło:: Journal of Telecommunications and Information Technology; 2020, 4; 10-21
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Throughput, Spectral, and Energy Efficiency of 5G Massive MIMO Applications Using Different Linear Precoding Schemes
Autorzy:: Salah, Ibrahim
Rahouma, Kamel Hussein
Hussein, Aziza I.
Mabrook, M. Mourad
Powiązania:: https://bibliotekanauki.pl/articles/2203002.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: throughput
massive MIMO
spectral efficiency
energy efficiency
trade-off
Opis:: On fifth-generation wireless networks, a potential massive MIMO system is used to meet the ever-increasing request for high-traffic data rates, high-resolution streaming media, and cognitive communication. In order to boost the trade-off between energy efficiency (EE), spectral efficiency (SE), and throughput in wireless 5G networks, massive MIMO systems are essential. This paper proposes a strategy for EE 5G optimization utilizing massive MIMO technology. The massive MIMO system architecture would enhance the trade-off between throughput and EE at the optimum number of working antennas. Moreover, the EE-SE tradeoff is adjusted for downlink and uplink massive MIMO systems employing linear precoding techniques such as Multiple -Minimum Mean Square Error (M-MMSE), Regularized Zero Forcing (RZF), Zero Forcing (ZF), and Maximum Ratio (MR). Throughput is increased by adding more antennas at the optimum EE, according to the analysis of simulation findings. Next, utilizing M MMSE instead of RZF and ZF, the suggested trading strategy is enhanced and optimized. The results indicate that M-MMSE provides the best tradeoff between EE and throughput at the determined optimal ratio between active antennas and active users equipment’s (UE).
Źródło:: International Journal of Electronics and Telecommunications; 2023, 69, 1; 185--191
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The optimal power control method in multiuser cellular networks
Autorzy:: Yaremko, O.
Stryhalyuk, B.
Maksymyuk, T.
Lavriv, O.
Kozhurov, D.
Powiązania:: https://bibliotekanauki.pl/articles/411155.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:: WCDMA
MIMO
power control policy
signal-to-noise ratio
traffic localization
Opis:: In this paper a method of power control policies optimization in radiointerface of mobile network with code-division multiplexing is proposed. It allows reducing the interference level in downlink and uplink channels. The optimum SNR is provided in the cell based on this power control method. The SNR is enough to ensure capacity requirements and service quality parameters.
Źródło:: ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2013, 2, 1; 63-67
2084-5715
Pojawia się w:: ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The New Features of 802.11ac Standard Improving the Corporate Wi-Fi Networks Capabilities
Nowe cechy standardu 802.11ac zwiększającego możliwości firmowych sieci Wi-Fi
Autorzy:: Dolińska, Iwona
Powiązania:: https://bibliotekanauki.pl/articles/439577.pdf
Data publikacji:: 2016
Wydawca:: Akademia Finansów i Biznesu Vistula
Tematy:: IEEE 802.11ac
MU-MIMO
multiuser MIMO
beamforming
BYOD trend
RTS/CTS transaction
MIMO dla wielu użytkowników (multiuser MIMO)
tworzenie strumieni
trend BYOD
transakcja RTS/CTS
Opis:: IEEE 802.11ac is the newest Wi-Fi standard, which is working only in 5 GHz radio band. This standard improves and extends 802.11n functionality, i.e. it has more channel bonding, denser constellation (modulation levels) and more spatial streams. Th e new features, introduced in 802.11ac, like multi-user MIMO (MU-MIMO) functionality, standards-based beamforming, RTS/CTS with bandwidth indication and longer aggregated frame are making it very useful in corporate wireless networks. In the article the author analyses the new Wi-Fi features from the point of view of corporate computer network demands.
IEEE 802.11ac jest najnowszym standardem Wi-Fi, który pracuje tylko w paśmie fal radiowych o częstotliwości 5 GHz. Standard ten doskonali i rozszerza funkcjonalność standardu 802.11n, tzn. ma więcej łączenia kanałów (ang. channel bonding), gęstszą konfigurację (więcej poziomów modulacji) i więcej strumieni przestrzennych. Nowe cechy, wprowadzone w 802.11ac, takie jak funkcjonalność MIMO dla wielu użytkowników naraz (MU-MIMO), tworzenie strumieni opartych na standardzie, RTS/CTS ze wskazaniem szerokości pasma i dłuższa struktura zagregowana czynią go bardzo użytecznym w fi rmowych sieciach bezprzewodowych. W artykule autorka analizuje nowe cechy Wi-Fi z punktu widzenia wymagań firmowych sieci komputerowych.
Źródło:: Kwartalnik Naukowy Uczelni Vistula; 2016, 1(47); 53-65
2084-4689
Pojawia się w:: Kwartalnik Naukowy Uczelni Vistula
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The Analysis of the New Opportunities and the Resulting Challenges of IEEE 802.11ax Wireless Network Standard
Analiza nowych możliwości i wynikających stąd wyzwań dla standardu technologii sieci bezprzewodowej IEEE 802.11ax
Autorzy:: Dolińska, Iwona
Powiązania:: https://bibliotekanauki.pl/articles/439983.pdf
Data publikacji:: 2018
Wydawca:: Akademia Finansów i Biznesu Vistula
Tematy:: IEEE 802.11ax
High-Efficiency Wireless
MU-MIMO
OFDMA
technologia IEEE 802.11ax
wysoko wydajna technologia bezprzewodowa (High-Efficiency Wireless)
Opis:: The evolution of Wi-Fi was focused primarily on achieving successively higher theoretical speeds in the past. However, in the real world, with lots of users with diverse needs, a network needs to be designed to deliver all users an efficient communication. IEEE 802.11ax standard is an upcoming wireless network standard, which is still at the design stage. It defines new features and possibilities in Wi-Fi transmission. The article presents the description in details PHY layer and the MAC layer of this amendment. Then an analysis of challenges is carried out, which is mainly focused on the hardware design and testing.
W przeszłości ewolucja Wi-Fi koncentrowała się przede wszystkim na osiąganiu sukcesywnie wyższych teoretycznych prędkości. Natomiast w świecie realnym, przy mnóstwie użytkowników i odmiennych potrzebach, sieć musi być zaprojektowana tak, by zapewniała wszystkim użytkownikom skuteczną komunikację. Standard IEEE 802.11ax jest standardem przyszłej sieci bezprzewodowej, która nadal pozostaje w stadium projektu. Określa on nowe cechy i możliwości w transmisji Wi-Fi. Artykuł przedstawia szczegółowy opis warstwy PHY i warstwy MAC tej modyfikacji. Następnie przeprowadzono analizę wyzwań, skoncentrowaną głównie na projekcie sprzętu komputerowego i testowaniu.
Źródło:: Kwartalnik Naukowy Uczelni Vistula; 2018, 3(57); 150-162
2084-4689
Pojawia się w:: Kwartalnik Naukowy Uczelni Vistula
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Studying and Modeling the Performance of the TCM-STBC Systems in the Rayleigh Channel
Autorzy:: Bendelhoum, Mohammed Sofiane
Lahcene, Mohamed Rida
Menezla, Fayssal
Elarbi, Abderraouf
Powiązania:: https://bibliotekanauki.pl/articles/1839490.pdf
Data publikacji:: 2021
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: BER
MIMO
SNR
STBC
STTC
TCM
TCM-STBC
Opis:: Multiple-input multiple-output (MIMO) systems will play an important role in future generations of wireless networks. Space-time block code (STBC) and space-time trellis code (STTC) are two techniques that may be used in multi-antenna radio systems. This paper aims, most importantly, to study the performance of STBC systems at different values of such parameters as spectral efficiency, matrix codes and constellations. A performance comparison between STBC and STTC schemes is performed. In order to show the efficiency of the system’s ability to communicate with uncoded and coded transmission structures over AWGN and Rayleigh channels, the trellis-coded modulation (TCM) is introduced. The results obtained show that the proposed TCM-STBC system model, using one and two receiving antennas, improves the performance of Rayleigh channel communication systems at 9.5 dB and 11.5 dB for a BER of 10−5.
Źródło:: Journal of Telecommunications and Information Technology; 2021, 1; 1-7
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Studying and Modeling the Performance of the TCM-STBC Systems in the Rayleigh Channel
Autorzy:: Bendelhoum, Mohammed Sofiane
Lahcene, Mohamed Rida
Menezla, Fayssal
Elarbi, Abderraouf
Powiązania:: https://bibliotekanauki.pl/articles/1839476.pdf
Data publikacji:: 2021
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: BER
MIMO
SNR
STBC
STTC
TCM
TCM-STBC
Opis:: Multiple-input multiple-output (MIMO) systems will play an important role in future generations of wireless networks. Space-time block code (STBC) and space-time trellis code (STTC) are two techniques that may be used in multi-antenna radio systems. This paper aims, most importantly, to study the performance of STBC systems at different values of such parameters as spectral efficiency, matrix codes and constellations. A performance comparison between STBC and STTC schemes is performed. In order to show the efficiency of the system’s ability to communicate with uncoded and coded transmission structures over AWGN and Rayleigh channels, the trellis-coded modulation (TCM) is introduced. The results obtained show that the proposed TCM-STBC system model, using one and two receiving antennas, improves the performance of Rayleigh channel communication systems at 9.5 dB and 11.5 dB for a BER of 10−5.
Źródło:: Journal of Telecommunications and Information Technology; 2021, 1; 1-7
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Squaring down plant model and I/O grouping strategies for a dynamic decoupling of left-invertible MIMO plants
Autorzy:: Dworak, P.
Powiązania:: https://bibliotekanauki.pl/articles/200946.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: multivariable systems
MIMO
dynamic decoupling
left-invertible systems
input-output pairing
polynomial approach
Opis:: In the paper problems with dynamic decoupling of the left-invertible multi-input multi-output dynamic (MIMO) linear time invariant plants using a squaring down technique are considered. The procedure of squaring down the plant model and grouping of plant inputs and outputs are discussed. The final part of the paper includes a few examples of different strategies of synthesis of a decoupled system along with conclusions and final remarks.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 471-479
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

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

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Skocz do pozycji: 14.

Tytuł:: Review of Applications of the Laboratory for Electromagnetic Compatibility Infrastructure
Autorzy:: Staniec, Kamil
Jóskiewicz, Zbigniew
Janukiewicz, Jarosław
Więckowski, Tadeusz
Powiązania:: https://bibliotekanauki.pl/articles/963848.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: MIMO
IoT
GTEM cell
anechoic
semi-anechoic
reverberation
chamber
MCL
multipath
textiles
shielding effectiveness
broadband
radio
Opis:: This article provides a thorough description of a range of non-standard application cases in which EMC laboratories can be used other than those traditionally associated with this kind of facilities. The areas covered here include investigations of: wireless and radio systems (such as IoT and broadband radio systems) also that require ultra-high operational dynamic range, emulation of interference-free and/or heavilymultipath propagation environment, shielding effectiveness of cabinets and materials (i.e. thin, light and flexible as textiles as well as heavy and thick such as building construction elements).
Źródło:: International Journal of Electronics and Telecommunications; 2020, 66, 1; 107-123
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Resource allocation in MIMO systems specific to radio communication
Autorzy:: Ghaderi, Bahar
Parhizgar, Naser
Powiązania:: https://bibliotekanauki.pl/articles/140794.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: spatial modulation
multi quadrature amplitude modulation
modulation
Huffman coding
MIMO systems
Opis:: The performance of the multi-input multi-output (MIMO) systems can be improved by spatial modulation. By using spatial modulation, the transmitter can select the best transmit antenna based on the channel variations using channel state information (CSI). Also, the modulation helps the transmitter to select the best modulation level such that the system has the best performance in all situations. Hence, in this paper, two issues are considered including spatial modulation and information modulation selection. For the spatial modulation, an optimal solution for obtaining the probability of selecting antenna is calculated and then Huffman coding is used such that the transmitter can select the best transmit antenna to maximize the channel capacity. For the information modulation, a multi quadrature amplitude modulation (MQAM) strategy is used. In this modulation, the modulation size is changed based on the channel state variations; therefore, the best modulation index is used for transmitting data in all channel situations. In simulation results, the optimal method is compared with Huffman mapping. In addition, the effect of modulation on channel capacity and a bit error rate (BER) is shown.
Źródło:: Archives of Electrical Engineering; 2019, 68, 1; 91-100
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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