Ali Raza - Profile on Academia.edu (original) (raw)
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Papers by Ali Raza
After the deployment of 5th generation (5G), the beyond 5G (B5G) and 6th generation (6G) communic... more After the deployment of 5th generation (5G), the beyond 5G (B5G) and 6th generation (6G) communication grabs the critical attention of academia and researchers. In ongoing cellular generation, the selected radio spectrum (i.e., millimeter waves [mm-Wave]) is unable to achieve the required data rates. Future cellular generations need more data rate and link reliability to serve emerging intelligent applications of B5G and 6G (e.g., autonomous driving, virtual reality, etc.). To handle these limitations of ongoing cellular generation, the researchers are working on key factors to have a smart, high capacity and ultra-reliable propagation environment. To increase the data rate of the B5G and 6G network systems, the terahertz (THz) band is selected. However, to increase link reliability, the intelligent reflecting surfaces (IRSs) have a crucial impact on wireless network environments. Immense work has been done on the performance analysis of IRS-assisted wireless communication networks. This treatise imposes a comparison of such IRS-assisted THz communication systems, and future promising applications.
Wireless Personal Communications, 2021
Non-orthogonal multiple access (NOMA) scheme, potentially enabling high spectral efficiency, is o... more Non-orthogonal multiple access (NOMA) scheme, potentially enabling high spectral efficiency, is one of the key technological innovations in the 5th generation (5G) cellular networks. The massive machine type communications (mMTC) service category of 5G supports ultra-dense deployment of connected devices with low-power and low datarate requirements, and so it naturally supports internet-of-things (IoT) communications. Also, the ambient backscatter communications (BsC) holds potential for enabling energyconstrained IoT communications due to its extremely low power requirements. This work analyzes the downlink of a NOMA-enabled cellular system bundled with symbiotic radiobased mMTC. Closed-form expressions of the outage probability for the signal-to-interference and noise ratio (SINR) and the ergodic rate are derived for the symbiotic radio backscatter device as well as the primary cellular user. Several interesting use-cases of the proposed system model are discussed for future massive IoT and cell-free networks. The theoretical results presented are validated through numerical evaluations.
IEEE Access, 2020
Unmanned aerial vehicle (UAV) assisted cell-free communications hold promise for enhancing the co... more Unmanned aerial vehicle (UAV) assisted cell-free communications hold promise for enhancing the coverage and capacity of heterogeneous cellular networks. However, the network interference in such scenarios must be accurately modeled for efficient system design. The spatial characteristics of the desired and interfering signals can be jointly modeled by considering the characteristics of the signal-to-interference ratio (SIR). This work proposes a generalized framework for modeling the spatial statistics of the SIR encountered in 3-D volumetric inter-vehicular communication channels. Though the novel paradigm of UAV-assisted cell-free vehicular communications is analyzed in particular, the proposed framework is more general in that it incorporates 3-D mobility at both link ends. Also, this framework is shown to include as its special cases, several notable 2-D propagation models of network interference including those for terrestrial vehicle-to-vehicle and fixed-to-vehicle scenarios. Analytical expressions are derived for the SIR level-crossing-rate (LCR), average-fade-duration (AFD), spatial auto-covariance (SAC), and coherence distance (CD). Both single-and multi-cluster scattering environments are analyzed and the impact of channel parameters such as the direction and velocity of mobile nodes as well as the altitudes of the UAV and scattering cluster(s) on the SIR fading statistics is investigated. Finally, some future extensions of this work are also discussed such as the integration of intelligent reflective surfaces in the propagation scenario to generate favorable channel conditions. INDEX TERMS Channel modeling, cell-free communications, fading, interference, inter-vehicular, signalto-interference ratio, second-order statistics, unmanned aerial vehicle (UAV).
Teaching Documents by Ali Raza
Puzzles are among the most enjoyable pastimes for children. They’re entertaining, interesting, an... more Puzzles are among the most enjoyable pastimes for children. They’re entertaining, interesting, and demanding, and you can use them as learning tools to help the development of your children. Even easy puzzles need a certain degree of skill and commitment to complete. Once done, the effects are for people of all ages, but especially for children. This article provides the insight on how puzzles help children for cognitive development.
After the deployment of 5th generation (5G), the beyond 5G (B5G) and 6th generation (6G) communic... more After the deployment of 5th generation (5G), the beyond 5G (B5G) and 6th generation (6G) communication grabs the critical attention of academia and researchers. In ongoing cellular generation, the selected radio spectrum (i.e., millimeter waves [mm-Wave]) is unable to achieve the required data rates. Future cellular generations need more data rate and link reliability to serve emerging intelligent applications of B5G and 6G (e.g., autonomous driving, virtual reality, etc.). To handle these limitations of ongoing cellular generation, the researchers are working on key factors to have a smart, high capacity and ultra-reliable propagation environment. To increase the data rate of the B5G and 6G network systems, the terahertz (THz) band is selected. However, to increase link reliability, the intelligent reflecting surfaces (IRSs) have a crucial impact on wireless network environments. Immense work has been done on the performance analysis of IRS-assisted wireless communication networks. This treatise imposes a comparison of such IRS-assisted THz communication systems, and future promising applications.
Wireless Personal Communications, 2021
Non-orthogonal multiple access (NOMA) scheme, potentially enabling high spectral efficiency, is o... more Non-orthogonal multiple access (NOMA) scheme, potentially enabling high spectral efficiency, is one of the key technological innovations in the 5th generation (5G) cellular networks. The massive machine type communications (mMTC) service category of 5G supports ultra-dense deployment of connected devices with low-power and low datarate requirements, and so it naturally supports internet-of-things (IoT) communications. Also, the ambient backscatter communications (BsC) holds potential for enabling energyconstrained IoT communications due to its extremely low power requirements. This work analyzes the downlink of a NOMA-enabled cellular system bundled with symbiotic radiobased mMTC. Closed-form expressions of the outage probability for the signal-to-interference and noise ratio (SINR) and the ergodic rate are derived for the symbiotic radio backscatter device as well as the primary cellular user. Several interesting use-cases of the proposed system model are discussed for future massive IoT and cell-free networks. The theoretical results presented are validated through numerical evaluations.
IEEE Access, 2020
Unmanned aerial vehicle (UAV) assisted cell-free communications hold promise for enhancing the co... more Unmanned aerial vehicle (UAV) assisted cell-free communications hold promise for enhancing the coverage and capacity of heterogeneous cellular networks. However, the network interference in such scenarios must be accurately modeled for efficient system design. The spatial characteristics of the desired and interfering signals can be jointly modeled by considering the characteristics of the signal-to-interference ratio (SIR). This work proposes a generalized framework for modeling the spatial statistics of the SIR encountered in 3-D volumetric inter-vehicular communication channels. Though the novel paradigm of UAV-assisted cell-free vehicular communications is analyzed in particular, the proposed framework is more general in that it incorporates 3-D mobility at both link ends. Also, this framework is shown to include as its special cases, several notable 2-D propagation models of network interference including those for terrestrial vehicle-to-vehicle and fixed-to-vehicle scenarios. Analytical expressions are derived for the SIR level-crossing-rate (LCR), average-fade-duration (AFD), spatial auto-covariance (SAC), and coherence distance (CD). Both single-and multi-cluster scattering environments are analyzed and the impact of channel parameters such as the direction and velocity of mobile nodes as well as the altitudes of the UAV and scattering cluster(s) on the SIR fading statistics is investigated. Finally, some future extensions of this work are also discussed such as the integration of intelligent reflective surfaces in the propagation scenario to generate favorable channel conditions. INDEX TERMS Channel modeling, cell-free communications, fading, interference, inter-vehicular, signalto-interference ratio, second-order statistics, unmanned aerial vehicle (UAV).
Puzzles are among the most enjoyable pastimes for children. They’re entertaining, interesting, an... more Puzzles are among the most enjoyable pastimes for children. They’re entertaining, interesting, and demanding, and you can use them as learning tools to help the development of your children. Even easy puzzles need a certain degree of skill and commitment to complete. Once done, the effects are for people of all ages, but especially for children. This article provides the insight on how puzzles help children for cognitive development.