Publications Scientifiques

Permanent URI for this communityhttps://dspace.univ-boumerdes.dz/handle/123456789/10

Browse

Has files: YesSubject: search.filters.subject.5G

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Wideband Endfire Antenna Array for 5G mmWave Mobile Terminals
    (Institute of Electrical and Electronics Engineers Inc., 2024) Zidour, Ali; Ayad, Mouloud; Alibakhshikenari, Mohammad; See, Chan Hwang; Lai, Ying-Xin; Ma, Yue.; Guenad, Boumediene; Livreri, Patrizia; Khan, Salahuddin; Pau, Giovanni; Denidni, Tayeb A.
    In this paper, a compact endfire antenna array with low-profile, small clearance, and wideband operation is proposed for millimeter-wave (mmWave) fifth-generation (5G) mobile terminals. The wideband operation is achieved by exciting two identical bow-tie dipoles inserted on both sides of a multilayer substrate fed by an asymmetric open-end stripline to slotline transition. The antenna performance is significantly improved by introducing a set of vertical metallic vias. The proposed antenna element can achieve 29 % from 24.2 GHz to 32.4 GHz with a peak realized gain that varies from 3.5 dBi to 4.5 dBi. A linear 4-element antenna array is arranged and fabricated to verify the proposed antenna beamforming capabilities. The simulated and measured bandwidth achieves a wide range of 34.4 % (24-34 GHz) to support 26, 28, and 30 GHz 5G mmWave bands with an isolation level better than 20 dB and a peak realized gain over the interested bands ranging from 7.56 to 8.14 dBi. The simulated array scanning angle is ± 68° at 28 GHz within 3-dB gain deterioration. Furthermore, the simulated spherical coverage has met the requirements of 3GPP standards which make the proposed antenna array a promising candidate to be integrated within mmWave 5G mobile devices
  • No Thumbnail Available
    Item
    Performance evaluation of a 60-GHz RoF-OFDM system for wireless applications
    (Springer, 2021) Yahia, Selma; Graini, Leila; Beddiaf, Safia; Benmessaoud Gabis, Asma; Meraihi, Yassine
    Radio over fiber (RoF) is an emerging and promising communication technology based on combining wireless and fiber-optic communications, where light is modulated with radio frequency signals and transmitted over the optical fiber. This paper proposes a modified RoF communication system based on the incorporation of the orthogonal frequency division multiplexing (OFDM) technique into RoF system, called RoF-OFDM. We focus on the transmission of OFDM signals at the frequency of 60 GHz. The performance of the proposed RoF-OFDM system is evaluated in terms of bit error rate (BER) and the constellation diagrams. For this purpose, we use three different formats of quadrature amplitude modulation (QAM) such as 16-QAM, 64-QAM, and 256-QAM, and various values of data rate, Optical Signal-to-Noise Ratio (OSNR), input optical power, and fiber length. Simulation results show that RoF-OFDM system using 16-QAM gives good results in terms of fiber length and OSNR. However, the best performance using 64-QAM is obtained in the case of optical power. In addition, in terms of bit rate, 16-QAM outperforms both 64-QAM and 256-QAM formats for a bit rate lower than 17 Gbit/s. Otherwise, the best performance is given with 64-QAM