Abdullah Hossain | City College of New York (original) (raw)

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Papers by Abdullah Hossain

IEEE Transactions on Vehicular Technology, Jul 1, 2023

IEEE Internet of Things Journal, Dec 1, 2022

arXiv (Cornell University), Jun 4, 2022

Adept network management is key for supporting extremely heterogeneous applications with stringen... more Adept network management is key for supporting extremely heterogeneous applications with stringent quality of service (QoS) requirements; this is more so when envisioning the complex and ultra-dense 6G mobile heterogeneous network (HetNet). From both the environmental and economical perspectives, non-homogeneous QoS demands obstruct the minimization of the energy footprints and operational costs of the envisioned robust networks. As such, network intelligentization is expected to play an essential role in the realization of such sophisticated aims. The fusion of artificial intelligence (AI) and mobile networks will allow for the dynamic and automatic configuration of network functionalities. Machine learning (ML), one of the backbones of AI, will be instrumental in forecasting changes in network loads and resource utilization, estimating channel conditions, optimizing network slicing, and enhancing security and encryption. However, it is well known that ML tasks themselves incur massive computational burdens and energy costs. To overcome such obstacles, we propose a novel layer-based HetNet architecture which optimally distributes tasks associated with different ML approaches across network layers and entities; such a HetNet boasts multiple access schemes as well as device-to-device (D2D) communications to enhance energy efficiency via collaborative learning and communications.

International Conference on Fibre Optics and Photonics, 2012

ABSTRACT We propose an inexpensive, SOA-based, dual-wavelength tunable fiber laser. Dual-waveleng... more ABSTRACT We propose an inexpensive, SOA-based, dual-wavelength tunable fiber laser. Dual-wavelength selectivity and wavelength difference (Δλ) tunability are accomplished over the C-band. Optical power and wavelength stability are measured at 0.33 dB and 0.014 nm, respectively.

IEEE Access, 2019

The 5G mobile fronthaul (MFH) is bound to be overwhelmed by the explosive growth and stringent re... more The 5G mobile fronthaul (MFH) is bound to be overwhelmed by the explosive growth and stringent requirements of future wireless traffic. The time division multiplexed (TDM) passive optical network (PON) is a candidate for supporting such an MFH. Typically, such a TDM-PON utilizes upstream dynamic bandwidth allocation (DBA) schemes that are centralized at a distant central office (CO) which results in a performance that is not best suited for the MFH. Therefore, this work proposes a novel control framework by shifting the centralized DBA tasks away from the CO towards the closely clustered Remote Radio Heads (RRHs). By exploiting the interconnectivity of the RRHs, the access nodes exchange signaling and control information among themselves to facilitate a fully distributed upstream DBA without the involvement of the CO. The proposed framework separates the control plane from the data plane which paves the way for an efficient exchange of control messages, increased available upstream bandwidth and improved cyclic bandwidth allocation. This translates into a TDM-PON based MFH with lower latency, higher utilization and reduced packet loss. INDEX TERMS 5G, dynamic bandwidth allocation, mobile fronthaul, radio access network.

Adept network management is key for supporting extremely heterogeneous applications with stringe... more Adept network management is key for supporting extremely heterogeneous applications with stringent quality of service (QoS) requirements; this is more so when envisioning the complex and ultra-dense 6G mobile heterogeneous network (HetNet). From both the environmental and economical perspectives, non-homogeneous QoS demands obstruct the minimization of the energy footprints and operational costs of the envisioned robust networks. As such, network intelligentization is expected to play an essential role in the realization of such sophisticated aims. The fusion of artificial intelligence (AI) and mobile networks will allow for the dynamic and automatic configuration of network functionalities. Machine learning (ML), one of the backbones of AI, will be instrumental in forecasting changes in network loads and resource utilization, estimating channel conditions, optimizing network slicing, and enhancing security and encryption. However, it is well known that ML tasks themselves incur ma...

The implementation and performance of a unidirectional all-single mode fiber hybrid passive varia... more The implementation and performance of a unidirectional all-single mode fiber hybrid passive variable optical coupler/attenuator based on a Sagnac loop mirror with a continuous variable coupling ratio using off-the-shelf optical sub-components are discussed. Parameters of two output ports of the unidirectional hybrid passive variable optical coupler/attenuator, such as maximum coupling ratio, insertion loss, excess loss, and wavelength- dependent return loss over the C-band at room temperature are reported. The reflectivity of the Sagnac loop mirror continuously varies from 0.1% to 99.9% by adjusting retarders of a polarization controller. The 3-dB coupling ratio (i.e., 50:50) between the two output ports of the hybrid passive variable optical coupler/attenuator is achieved when the reflectivity of the Sagnac loop mirror is set at 73%. The attenuation and coupling ratio range of 1.7 - 45.5 dB and 0.13 - 99.87% is achieved, respectively, from the implemented unidirectional hybrid pass...

There have been several breakthroughs in terahertz science and technology. Major recent advances ... more There have been several breakthroughs in terahertz science and technology. Major recent advances have brought novel avenues for terahertz generation to the limelight. Research work pertaining to terahertz generation and its applications has expanded at an unprecedented rate. This encompassing review provides a detailed description of current means of terahertz generation with a special focus on optical sources. Finally, a specific recent development utilizing a novel dual-wavelength, C-band, SOA-based, fiber hybrid compound-ring resonator source is discussed. Boasting both single and dual-port operation, this source is utilized to excite a terahertz photo-mixer and achieves a difference wavelength tuning range of 20.42 nm (i.e., 2.51 THz) which corresponds to a terahertz radiation range of 0.8–2.51 THz at room temperature.

IEEE Transactions on Vehicular Technology

This paper examines network slicing within the radio access network which employs an orthogonal f... more This paper examines network slicing within the radio access network which employs an orthogonal frequency division multiple access system for downlink communications. Its radio resources are allocated among slices configured for specific 5G use cases as well as other non-5G services. This work sets out to achieve optimal resource provisioning and power allocation within the context of priority slicing where slices are assigned priority levels by the base station. A mixed-integer non-linear programming problem is formulated to maximize the throughput of a best effort slice while satisfying the constraints of the high priority 5G slices. The problem is simplified and relaxed into a convex optimization problem. Three scenarios under various conditions are presented to serve as benchmarks. The impact of the chosen schedulers on the allocations, intra-slice, and inter-slice contentions is also examined. The results highlight that the wireless network can satisfy the quality-of-service requirements of opposing levels of priorities of traffic while simultaneously mitigating both inter-slice and intra-slice contentions under conditions mirroring that of practical wireless network deployments. Furthermore, it is proven that the convex approximation problem serves as a reasonable approximation of the original MINLP problem.

Proceedings of the 6th International Conference on Photonics, Optics and Laser Technology, 2018

A novel technique of generating two colors or dual-wavelength in a fiber hybrid compound-ring res... more A novel technique of generating two colors or dual-wavelength in a fiber hybrid compound-ring resonator is discussed. Generation of continuous-wave terahertz radiation is demonstrated by using a dual-wavelength widely tunable C-band SOA-based fiber compound-ring laser as a light source, which excites a continuouswave terahertz photomixer operating at 1.55 µm telecom optical wavelengths. The proposed dualwavelength fiber laser has a hybrid compound-ring resonator structure and external reflectors that allow output power upscaling and single or dual-output port operation, respectively. Wavelength selection and continuous tunability are achieved by a widely tunable optical filter sandwiched between two fiber-Bragg grating filters of similar Bragg center wavelength. The difference wavelength tuning range of 20.42 nm (i.e., 2.51 THz) is demonstrated in the C-band. Continuous-wave terahertz radiation with continuous tunability between 0.8 and 2.51 THz at room temperature using only a fiber laser source is achieved via photomixing.

Journal of Optical Communications and Networking

To improve fiber-wireless (FiWi) access network performance, this work proposes a distributed con... more To improve fiber-wireless (FiWi) access network performance, this work proposes a distributed control plane by simply shifting the centralized control task away from the distant central office (optical plane) towards the closely clustered wireless nodes (wireless plane) at the access end. This distributed scheme results in a globally optimized upstream resource allocation scheme, thus paving the way for improved performance.

Springer Series in Optical Sciences, 2019

A simple, stable, compact, and cost-effective dual-output port widely tunable SOA-based fiber com... more A simple, stable, compact, and cost-effective dual-output port widely tunable SOA-based fiber compound-ring laser structure is demonstrated. Such a unique nested ring cavity enables the splitting of optical power into various branches where amplification and wavelength selection for each branch are achieved utilizing low-power SOAs and a tunable filter, respectively. Furthermore, splicing Sagnac Loop Mirrors at each end of the bidirectional fiber compound-ring cavity not only allows them to serve as variable reflectors but also enables them to channel the optical energy back to the same port thus omitting the need for high optical power combiners. Further discussed is how the said bidirectional fiber compound-ring laser structure can be extended to achieve a high-power fiber laser source by exclusively using low power optical components such as N × N couplers and (N > 1) number of SOAs. More than 98% coherent beam combining efficiency of two parallel nested fiber ring resonators ...