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Slotted ALOHA with Uplink Orbital Angular Momentum for 6G Massive IoT
Abdullah Qayyum,I Nyoman Apraz Ramatryana,Soo Young Shin 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
This paper proposes novel slotted ALOHA (SA) with orbital angular momentum (OAM) for 6G massive internet of things (IoT). In OAM-based SA (OAM-SA), devices transmit packets in random OAM modes and slots, jointly, where OAM modes are considered as a new diversity domain. The throughput of OAM-SA is derived and compared with conventional SA and power division multiple access (PDMA). The numerical results show that OAM-SA outperforms both SA and PDMA. The proposed OAM-SA with PDMA is also investigated in this paper and the results are a potential proof that OAM-SA is applicable for future wireless access to support 6G massive IoT applications.
Capacity Analysis of OAM-MIMO based on Transmitter and Receiver Distance
Abdullah Qayyum,Ahmed Al Amin,Soo Young Shin 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
The channel capacity plays an important role in the estimation of the maximum data that can be transferred through a given channel. Orbital angular momentum (OAM) is gaining importance in the research community because of the multiple orthogonal modes. Higher OAM modes diverge with the transmission distance. In this paper, the channel capacity of the OAM-MIMO system is analyzed by varying the distance between the OAM transmitter and receiver.
OAM-mMIMO: A Massive Capacity Scheme for 6G Wireless Backhaul Connectivity
Ahmed Al Amin,Abdullah Qayyum,Soo Young Shin 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
The massive capacity backhaul wireless connectivity is required for future 6G. But due to interference issues and the division of resources (Time/Frequency/Code) of wireless communication degrade the capacity achievement in case of the backhaul connection for future 6G wireless communication. Hence, the OAM technique is integrated with massive MIMO which is termed as OAM-mMIMO scheme. Moreover, the divergence of the OAM beam can be overcome by the proposed OAM-mMIMO scheme. In addition, the superiority of the proposed OAM-mMIMO scheme over the conventional schemes is evaluated by simulation results.
Abdul Rahman Hasbullah,Rahman Md. Mujibur,Yahya Wira Jazair,Kaonain Tamanna E.,Abd Kadir Hasannuddin,Tamam Mohamad Qayyum Mohd,Ithnin Ahmad Muhsin,Ahmad Fauzan,Abdullah Mohd Fareez Edzuan,Noge Hirofum 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.5
Water-in-diesel emulsion fuel has become a popular alternative fuel for diesel engines. The main limitation is related to its stability, whereby it relies heavily on surfactants to remain homogeneous, therefore causing production costs to rise. This paper highlights the application of real-time non-surfactant emulsion fuel supply system (RTES), a water/diesel emulsifying device without surfactants, to produce water-in-diesel emulsion fuel in a common rail direct injection diesel engine powered vehicle. In this study, RTES was installed near to the diesel fuel pump to ensure water-in-diesel emulsions were continuously fed to the engine. The test vehicle was set up on a roller dynamometer and operated following a modified West Virginia University (WVU) 5-Peak cycle. Fuel consumption and exhaust emissions were measured to determine the optimum water percentage of emulsion fuel and suitable timing for emulsion fuel to be introduced into the fuelling system based on the vehicle speed. The results revealed that the optimum water percentage of the emulsion fuel for the test vehicle is 10 wt%, as it was capable to reduce fuel consumption as well as nitrogen oxides and smoke emissions of a common rail direct injection diesel engine powered vehicle.