Yazar "Abdulateef, Alaa Amjed" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • [ X ]
    Öğe
    An erbium-doped EDFA amplifier pump with a 1550-Nm pumped erbium-doped fibre
    (Institute of Electrical and Electronics Engineers Inc., 2022) Dheyab, Abdullah; Kshash, Abdullah Dawood; Al-Sabti, Saif Mohamed Baraa; Abdulateef, Alaa Amjed; Abdulateef, Ihsan Amjad; Elwiya, Lina
    To take full use of the large bandwidth given by fibre optics and the flexibility afforded by wireless broadcasting on a widespread scale, RoF-based optical-wireless networks are widely regarded as the most important approach for improving capability, coverage, bandwidth, and mobility. WDM-RoF-PON architectures are described and demonstrated in this document. In order to verify the viability of the associated designs, a number of approaches including injection locking, direct/external modulation, re-modulation, and homodyne detection were used. The goal of this study is to create a WDM-RoF-PON using a reflective semiconductor optical amplifier (RSOA) to transmit 2.5 Gb/s baseband (BB) and 1.25 Gb/s wireless signalling downlink and 1 Gb/s (BB) signal in uplink over a 25 km single mode fibre (SMF) and wireless downlink signal over a 25 km SMF and 5.2 m free-spread fibre (FSF) link. This research also aims Downlink wired and remote communications may be successfully sent using both the confused light infusion plan and the twofold sideband optical transporter concealment (DSBCS) approach. In order to reuse the downlink carrier for uplink transmission, RSOA is employed.
  • [ X ]
    Öğe
    Performance analyses of channel estimation and precoding for massive MIMO downlink in the TDD system
    (Institute of Electrical and Electronics Engineers Inc., 2020) Abdulateef, Alaa Amjed; Ibrahim, Shakir Mahmood; Mohammed, Alaa Hamid; Abdulateef, Ihsan Amjad
    The fundamental limitation of massive MIMO technology is pilot contamination effect. This effect occurs during uplink training when terminals use the same orthogonal signals. In this paper, a pilot reuse factor with large scale fading precoding is proposed to mitigate the pilot contamination effect. The pilot reuse factor is designed to assign unique orthogonal signals to the adjacent cells. These unique orthogonal signals are reused only within the cell and hence, intra-pilot contamination is the only concern. Large scale fading precoding is then used to mitigate the intra-pilot contamination effect. The average achievable sum rate is computed for different pilot reuse factors. Experimental results through MATLAB simulation show that a higher pilot reuse factor gives better average achievable sum rates. © 2020 IEEE.
  • [ X ]
    Öğe
    Wireless body region networks abnormality identification and energy saving a study
    (Institute of Electrical and Electronics Engineers Inc., 2020) Al-Sabti, Saif Mohamed Baraa; Abdulateef, Alaa Amjed; Atilla, Çağdaş; Mohammed, Alaa Hamid
    Current advances in wireless body networking technologies help to escape any of the healthcare industry-related problems. Wearable biomedical devices and their related innovations are in vogue lately, with constant health surveillance being mandatory for many chronic patients. Energy conservation is critical in wireless body area networks (WBANs) since the sensor nodes are energy constraint devices. Energy conservation through data reduction approaches in WBANs is a comparatively less explored area in which the detection of probabilistic anomaly models is becoming inevitable for the prevention of serious health problems. This paper reviews wireless body area networks for anomaly detection in various applications and discusses how models can be made for the energy conservation of WBAN devices. © 2020 IEEE.