Afsana Nadia has completed her B.Sc. Engineering in Electronics and Telecommunication Engineering from Daffodil International University, Dhaka, Bangladesh in 2011 and M.S. Engineering in Telecommunication Engineering from East West University, Dhaka, Bangladesh in 2012. She is the associate member of Bangladesh Computer Society and the Member of IEB. Her fields of research are computer networks, wireless and mobile communications.
In this work, the capacity and coverage area of GSM system have been studied. This paper presents... more In this work, the capacity and coverage area of GSM system have been studied. This paper presents the importance of using link budget calculations, determining the path loss and cell range for RF coverage planning and improving capacity using cell-sectoring. The major contribution is to estimate the coverage of GSM system which depends on BS antenna height, transmitting antenna gain, output power of BS for propagation environment such as rural, sub-urban and urban case. MATLAB has been used for simulation and performance evaluation of capacity and coverage in GSM system. Path loss for uplink and downlink has been calculated using Link Calculator software considering 3-sector antenna. Analysis reveals that coverage area improves significantly considering spectral efficiency, interference and cell sectoring. As an example, Google Earth and Radio Works software have been used to estimate the coverage area for a particular area. A 3D coverage map has been formulated using this result.
Usually, the number of users within a cell in a mobile cellular network is considered infinite; h... more Usually, the number of users within a cell in a mobile cellular network is considered infinite; hence, í µí±/í µí±/í µí±/í µí± model is appropriate for new originated traffic, but the number of ongoing calls around a cell is always finite. Hence, the traffic model of handoff call will be í µí±/í µí±/í µí±/í µí±/í µí±. In this paper, a í µí°¾-dimensional traffic model of a mobile cellular network is proposed using the combination of limited and unlimited users case. A new call admission scheme (CAS) is proposed based on both thinning scheme and fading condition. The fading condition of the wireless channel access to a handoff call is prioritized compared to newly originated calls. (How to Cite this Article: Md. Baitul Al Sadi and Afsana Nadia, “Call Admission Scheme for Multidimensional Traffic Assuming Finite Handoff User,” Journal of Computer Networks and Communications, vol. 2017, Article ID 6101568, 5 pages, 2017. doi:10.1155/2017/6101568)
—Now-a-days, intense research is going on two-hop wireless link under different fading conditions... more —Now-a-days, intense research is going on two-hop wireless link under different fading conditions with its remedial measures. In this paper work, a two-hop link under three different conditions is considered: (i) MIMO on both hops, (ii) MISO in first hop and SIMO in second hop and finally (iii) SIMO in first hop and MISO in second hop. The three models used here give the flexibility of using STBC (Space Time Block Coding) and combining scheme on any of the source to relay (S-R) and relay to destination (R-D) link. Even incorporation of Transmitting Antenna Selection (TAS) is possible on any link. Here, the variation of SER (Symbol Error Rate) is determined against mean SNR (Signal-to-Noise Ratio) of R-D link for three different modulation schemes: BPSK, 8-PSK and 16-PSK, taking the number of antennas and SNR of S-R link as parameters under Nakagami-m fading condition.
A p-in junction solar cell is proposed which is modeled by changing only the composition of the s... more A p-in junction solar cell is proposed which is modeled by changing only the composition of the selected material as GaInAsP for better efficiency consumption. On the basis of homo-junction, hetero-junction and multi-junction solar cell models, we have designed our proposed model. The effective density of states for conduction band and valance band are constant, total number of electrons and holes are same. By analyzing the band gap relation for quaternary materials, the maximum and minimum band gaps has found for the material GaInAsP which are 2.073eV and 0.5153 eV respectively. But this model is valid for ±0.05 % mismatch in lattice parameter between substrate and active materials. So the desired band gap range is 0.5135 eV-1.3723eV. That means our proposed solar cell can absorb those photons which correspond wavelength are 901 and 2416 nm. The penetration depth has calculated for those energized photons. The objective of our paper is that we could easily control the lattice parameter and band gap of this material by using quaternary semiconductor material, GaInAsP. If we vary the composition, then we could get desired band gap with satisfied lattice constant.
— In this work, the capacity and coverage area of GSM system have been studied. This paper presen... more — In this work, the capacity and coverage area of GSM system have been studied. This paper presents the importance of using link budget calculations, determining the path loss and cell range for RF coverage planning and improving capacity using cell-sectoring. The major contribution is to estimate the coverage of GSM system which depends on BS antenna height, transmitting antenna gain, output power of BS for propagation environment such as rural, suburban and urban case. MATLAB has been used for simulation and performance evaluation of capacity and coverage in GSM system. Path loss for uplink and downlink has been calculated using Link Calculator software considering 3-sector antenna. Analysis reveals that coverage area improves significantly considering spectral efficiency, interference and cell sectoring. As an example, Google Earth and Radio Works software have been used to estimate the coverage area for a particular area. A 3D coverage map has been formulated using this result.
In this work, the capacity and coverage area of GSM system have been studied. This paper presents... more In this work, the capacity and coverage area of GSM system have been studied. This paper presents the importance of using link budget calculations, determining the path loss and cell range for RF coverage planning and improving capacity using cell-sectoring. The major contribution is to estimate the coverage of GSM system which depends on BS antenna height, transmitting antenna gain, output power of BS for propagation environment such as rural, sub-urban and urban case. MATLAB has been used for simulation and performance evaluation of capacity and coverage in GSM system. Path loss for uplink and downlink has been calculated using Link Calculator software considering 3-sector antenna. Analysis reveals that coverage area improves significantly considering spectral efficiency, interference and cell sectoring. As an example, Google Earth and Radio Works software have been used to estimate the coverage area for a particular area. A 3D coverage map has been formulated using this result.
Usually, the number of users within a cell in a mobile cellular network is considered infinite; h... more Usually, the number of users within a cell in a mobile cellular network is considered infinite; hence, í µí±/í µí±/í µí±/í µí± model is appropriate for new originated traffic, but the number of ongoing calls around a cell is always finite. Hence, the traffic model of handoff call will be í µí±/í µí±/í µí±/í µí±/í µí±. In this paper, a í µí°¾-dimensional traffic model of a mobile cellular network is proposed using the combination of limited and unlimited users case. A new call admission scheme (CAS) is proposed based on both thinning scheme and fading condition. The fading condition of the wireless channel access to a handoff call is prioritized compared to newly originated calls. (How to Cite this Article: Md. Baitul Al Sadi and Afsana Nadia, “Call Admission Scheme for Multidimensional Traffic Assuming Finite Handoff User,” Journal of Computer Networks and Communications, vol. 2017, Article ID 6101568, 5 pages, 2017. doi:10.1155/2017/6101568)
—Now-a-days, intense research is going on two-hop wireless link under different fading conditions... more —Now-a-days, intense research is going on two-hop wireless link under different fading conditions with its remedial measures. In this paper work, a two-hop link under three different conditions is considered: (i) MIMO on both hops, (ii) MISO in first hop and SIMO in second hop and finally (iii) SIMO in first hop and MISO in second hop. The three models used here give the flexibility of using STBC (Space Time Block Coding) and combining scheme on any of the source to relay (S-R) and relay to destination (R-D) link. Even incorporation of Transmitting Antenna Selection (TAS) is possible on any link. Here, the variation of SER (Symbol Error Rate) is determined against mean SNR (Signal-to-Noise Ratio) of R-D link for three different modulation schemes: BPSK, 8-PSK and 16-PSK, taking the number of antennas and SNR of S-R link as parameters under Nakagami-m fading condition.
A p-in junction solar cell is proposed which is modeled by changing only the composition of the s... more A p-in junction solar cell is proposed which is modeled by changing only the composition of the selected material as GaInAsP for better efficiency consumption. On the basis of homo-junction, hetero-junction and multi-junction solar cell models, we have designed our proposed model. The effective density of states for conduction band and valance band are constant, total number of electrons and holes are same. By analyzing the band gap relation for quaternary materials, the maximum and minimum band gaps has found for the material GaInAsP which are 2.073eV and 0.5153 eV respectively. But this model is valid for ±0.05 % mismatch in lattice parameter between substrate and active materials. So the desired band gap range is 0.5135 eV-1.3723eV. That means our proposed solar cell can absorb those photons which correspond wavelength are 901 and 2416 nm. The penetration depth has calculated for those energized photons. The objective of our paper is that we could easily control the lattice parameter and band gap of this material by using quaternary semiconductor material, GaInAsP. If we vary the composition, then we could get desired band gap with satisfied lattice constant.
— In this work, the capacity and coverage area of GSM system have been studied. This paper presen... more — In this work, the capacity and coverage area of GSM system have been studied. This paper presents the importance of using link budget calculations, determining the path loss and cell range for RF coverage planning and improving capacity using cell-sectoring. The major contribution is to estimate the coverage of GSM system which depends on BS antenna height, transmitting antenna gain, output power of BS for propagation environment such as rural, suburban and urban case. MATLAB has been used for simulation and performance evaluation of capacity and coverage in GSM system. Path loss for uplink and downlink has been calculated using Link Calculator software considering 3-sector antenna. Analysis reveals that coverage area improves significantly considering spectral efficiency, interference and cell sectoring. As an example, Google Earth and Radio Works software have been used to estimate the coverage area for a particular area. A 3D coverage map has been formulated using this result.
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Papers by Afsana Nadia
(How to Cite this Article: Md. Baitul Al Sadi and Afsana Nadia, “Call Admission Scheme for Multidimensional Traffic Assuming Finite Handoff User,” Journal of Computer Networks and Communications, vol. 2017, Article ID 6101568, 5 pages, 2017. doi:10.1155/2017/6101568)
(How to Cite this Article: Md. Baitul Al Sadi and Afsana Nadia, “Call Admission Scheme for Multidimensional Traffic Assuming Finite Handoff User,” Journal of Computer Networks and Communications, vol. 2017, Article ID 6101568, 5 pages, 2017. doi:10.1155/2017/6101568)