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1
Content available Transmission of 10 Gbps C-band-signal-based Radio Over Fiber for Next Generation Communication Systems
Al Deen Hasan K., Abd Haider J.
Journal of Telecommunications and Information Technology
|
2024
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nr 2
82--89
EN
Rapid development of 5G networks encourages researchers to improve the radio-over-fiber (RoF) technique in order to reach 10 Gbps data transmission rates, to increase bandwidth and range, while reducing latency and implementation cost. This paper evaluates an analog radio-over-fiber (ARoF) technique that is compatible with long-distance communication systems. We demonstrate a long distance transmission of a 28 GHz 64 QAM signal via a single mode fiber (SMF) after modulating it with the use of two parallel Mach-Zehnder modulators, without any optical amplifiers. The results show that our prototype solution is capable of transferring data over distances of up to 140 km, via SMF, with a 10 Gbps data rate. The error vector magnitude (EVM) was found to be 7.709%. The proposed system offers exceptional capabilities in terms of supporting high bitrates, while ensuring that EVM remains within the 3GPP limits. Compared to other works, the proposed solution proves to be superior in terms of performance, making it an ideal choice for next generation long-haul communication systems.
2
Content available Performance Enhancement of Cooperative MIMO-NOMA Systems Over Sub-6 GHz and mmWave Bands
Saleh Ahmed A., Ahmed Mohamad A.
Journal of Telecommunications and Information Technology
|
2023
|
nr 2
70--77
EN
In this paper, two radio links with different frequency bands are considered for base stations (BS) serving users via decode-and-forward (DF) cooperative relays. Backhaul and access links are proposed with sub-6 GHz and millimeter wave (mmWave) bands, respectively. Non-orthogonal multiple access (NOMA) is employed in the backhaul link to simultaneously transmit a superposed signal in the power domain, using the same band. The superposed signals, containing two signals that differ in terms of power allocation factors (PAFs), are designed for two selected DF relays in the BS. The two relays are chosen from several relays to be serviced by the BS based on a pairing algorithm that depends on different users’ circumstances. The furthest DF relay detects the incoming NOMA signal directly, while the nearest one applies successive interference cancellation (SIC) before extracting its signal. Each DF relay forwards the detected signals toward their intended users over mmWave channels. Three performance metrics are utilized to evaluate the system’s performance: outage probability, achievable throughput, and bit error rate. Comparisons between two mmWave bands in the access link (28 and 73 GHz) are made to demonstrate the superiority of the 28 GHz band in terms of the three performance-related metrics.
3
Content available remote Design of mmWave multi-sector array using Bowtie antenna elements for 5G mobile base stations
Younus Karam Mudhafar, Sabaawi Ahmed M. A.
Przegląd Elektrotechniczny
|
2022
|
R. 98, nr 5
115--120
EN
This paper proposes a compact multi-sector array structure based on bowtie antenna elements. The designed array consists of three (1×8) linear arrays to cover 360o. The array is designed to operate at 28 GHz on an RT/Duroid 5880 substrate to meet the high-frequency specifications with a thickness of 1.575 mm and a dielectric constant of 2.2, while the dissipation factor is (0.0009). Each array sector has a dimension of 30.17 mm as width and 6.4 mm as length. A beam steering performance is proved with the capability of switchable beams to offer directional/omnidirectional choices. Simulations results showed that the proposed array exhibits excellent reflection coefficient characteristics along with a high gain of up to 13.5 dBi and high radiation efficiency. Two configurations of array sectors are presented to introduce a flexible control of the array beams.
PL
W artykule zaproponowano kompaktową, wielosektorową strukturę macierzy opartą na elementach antenowych typu bowtie. Zaprojektowana macierz składa się z trzech (1×8) liniowych szyków pokrywających 360o. Macierz jest zaprojektowana do pracy z częstotliwością 28 GHz na podłożu RT/Duroid 5880 w celu spełnienia specyfikacji wysokiej częstotliwości przy grubości 1,575 mm i stałej dielektrycznej 2,2 przy współczynniku rozproszenia (0,0009). Każdy sektor tablicy ma wymiar 30,17 mm szerokości i 6,4 mm długości. Skuteczność sterowania wiązką została udowodniona dzięki możliwości przełączania wiązek w celu oferowania wyborów kierunkowych/wszechkierunkowych. Wyniki symulacji wykazały, że proponowana matryca wykazuje doskonałe właściwości współczynnika odbicia wraz z wysokim wzmocnieniem do 13,5 dBi i wysoką wydajnością promieniowania. Przedstawiono dwie konfiguracje sektorów matrycy w celu wprowadzenia elastycznego sterowania wiązkami matrycy.
4
Content available Design of Hybrid Precoder for mm-Wave MIMO System Based on Generalized Triangular Decomposition Method
Thurpati Sammaiah, Muthuchidambaranathan P.
International Journal of Electronics and Telecommunications
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2022
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Vol. 68. No. 3
519--525
EN
Hybrid precoding techniques are lately involved a lot of interest for millimeter-wave (mmWave) massive MIMO systems is due to the cost and power consumption advantages they provide. However, existing hybrid precoding based on the singular value decomposition (SVD) necessitates a difficult bit allocation to fit the varying signal-to-noise ratios (SNRs) of altered sub-channels. In this paper, we propose a generalized triangular decomposition (GTD)-based hybrid precoding to avoid the complicated bit allocation. The development of analog and digital precoders is the reason for the high level of design complexity in analog precoder architecture, which is based on the OMP algorithm, is very non-convex, and so has a high level of complexity. As a result, we suggest using the GTD method to construct hybrid precoding for mmWave mMIMO systems. Simulated studies as various system configurations are used to examine the proposed design. In addition, the archived findings are compared to a hybrid precoding approach in the classic OMP algorithm. The proposed Matrix Decomposition’s simulation results of signal-to-noise ratio vs spectral efficiencies.
5
Content available remote Short Performance Analysis of the LTE and 5G Access Technologies in NS-3
Baumgartner Maroš, Juhar Jozef, Papaj Jan
Annals of Computer Science and Information Systems
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2021
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Vol. 25
337--340
EN
Nowadays, the requirements for data transmission and efficiency of IoT networks are increasing. Network efficiency at all levels can be increased by using 5G networks. In this paper, we simulate and analyse the LTE, enhanced Mobile BroadBand, and enhanced Mobile BroadBand with Millimeter-wave services in scenarios with different numbers of IoT nodes and analyze the energy consumption and energy efficiency achieved results. Simulated scenarios and results were obtained using NS-3. Energy and mmWave frameworks were analyzed in this work because they were the main part of the research.
6
Analiza wpływu regionalnych wymagań dla emisji pozapasmowych na wydajność systemu 5G pracującego w paśmie 24,25 GHz – 27,5 GHz
Bechta Kamil, Gołębiewski Bartłomiej
Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
|
2019
|
nr 6
177--182, CD
PL
Piąta generacja (5G) telefonii komórkowej wprowadza do użytku nowe zakresy częstotliwości, z których jednym jest pasmo 24,25 GHz – 27,5 GHz sąsiadujące z pasywną satelitarną służbą badania Ziemi – EESS(p). Bliskie sąsiedztwo systemu EESS(p) wymusza na 5G konieczność minimalizacji emisji pozapasmowych. W artykule przedstawiono wyniki symulacyjnej analizy wpływu regionalnych wymagań na wydajności systemu 5G pracującego w zakresie częstotliwości 24,25 GHz – 27,5 GHz, jako bezprzewodowa pętla abonencka w środowisku podmiejskim.
EN
The fifth generation (5G) of mobile communication systems introduces new ranges of radio frequency, which one of is 24.25 GHz – 27.5 GHz, adjacent to the band of operation of passive Earth Exploration Satellite Service (EESS(p)). Due to that, 5G system has to minimize out of band emissions from 24.25 GHz – 27.5 GHz. This paper presents system level simulation results of performance of 5G small cells deployed in suburban area as fixed wireless access, conditioned by different regional inter-systems co-existence requirements for 24.25 GHz – 27.5 GHz frequency range.
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