Abdul Gafur - Academia.edu (original) (raw)

Papers by Abdul Gafur

International Journal of Electrical and Computer Engineering (IJECE)

Traffic congestion has been one of the major performance limiting factors of heterogeneous networ... more Traffic congestion has been one of the major performance limiting factors of heterogeneous networks (HetNets). There have been several load balancing schemes put up to solve this by balancing load among base stations (BSs), but they appear to be unfeasible due to the complexity required and other unsatisfactory performance aspects. Cell range extension (CRE) has been a promising technique to overcome this challenge. In this paper, a permutation based CRE technique is proposed to find the best possible formation of bias for BSs to achieve load balance among BSs. In comparison to the baseline scheme, results depict that the suggested method attains superior performance in terms of network load balancing and average throughput. The complexity of the suggested algorithm is considerably reduced in comparison to the proposed permutation based CRE method it is further modified from.

Indonesian Journal of Electrical Engineering and Computer Science

A wireless gigabit alliance (WiGig) is widely known for higher bandwidth which operates at 60GHz ... more A wireless gigabit alliance (WiGig) is widely known for higher bandwidth which operates at 60GHz unlicensed spectrum for super-fast data speed over short distances for millimeter-wave band application. This study offers an efficient, compact microstrip patch antenna for WiGig with a lesser return loss -50.45 dB (60 GHz). The gain and directivity of the proposed antenna are 13.01 dB and 13.42 dBi. It provides higher efficiency of around 91%. The proposed antenna also covers another mm-wave band that is at 95 GHz. The U.S. military uses electromagnetic radiation of 95 GHz as a non-lethal weapon. So, the anticipated antenna can be used for a miniaturized active denial system. The proposed antenna has a good gain, directivity, and efficiency for the multigigabits/s data rate. The aforesaid properties imply that it can be used for wireless personal area networks (WPAN) and wireless local area network (WLAN) and fifth-generation (5G) applications too.

Farmers in the Chattogram Hill Tracts (CHT) practice jhum farming raising several crops together ... more Farmers in the Chattogram Hill Tracts (CHT) practice jhum farming raising several crops together with upland rice being dominant. For regenerating soil fertility farmers leave the plot fallow moving to another plot. In recent years shortening of fallow length resulted in declining land productivity impacting negatively on jhum farmers’ food security. This paper mapped out the food security status of jhum farmers conducting a survey of 103 farmers across 23 villages (para) in four subdistricts of Bandarban district. Farms and farmers growing jhum crops were selected. Assessment of farmers’ household demography and level of food security was made conducting questionnaire-based survey and FGDs. Rice yields were estimated harvesting sample plots from the selected farmers’ fields. Majority of the households (83%) had 3-6 members per family and 74% households were headed by male farmers but women take on major responsibility of jhum farming. More than 56% household heads had no formal sch...

Rajshahi University Journal of Science and Engineering, 2015

In this paper we have analyzed the Gaussian Non-linear Interference (G_NLI)... more In this paper we have analyzed the Gaussian Non-linear Interference (G_NLI) spectrum considering non identical channels, non-identical links and Amplified Spontaneous Emission (ASE) noise power spectrum for Coherent Optical Transmission Network (COTN) to calculate the Optical Signal to Noise Ratio (OSNR) and Quality (Q) values. In this study, three different Baud rate values (13.875Gbaud, 27.75Gbaud, and 55.5Gbaud) are considered to compute the Q values and OSNR in the COTN. Consequently, the COTN produces 111 Gb/s, 222 Gb/s and 444 Gb/s line rates for three different Baud rate values (13.875Gbaud, 27.75Gbaud, and 55.5Gbaud) respectively in PM-16QAM modulation format. It is confirmed that the OSNR is always greater than Q values. It is also found that the differences between OSNR and Q are 0.23dB, 1.73dB, and 3.24dB for 111Gb/s, 222Gb/s and 444Gb/s line rates respectively. Here transmission of launch power per span, number of channels, number of spans and the f...

2014 International Conference on Electrical Engineering and Information & Communication Technology, 2014

In this paper, we analyse the theoretical performance of uncompensated optical transmission syste... more In this paper, we analyse the theoretical performance of uncompensated optical transmission system using Gaussian Noise (GN) model considering the effect of amplified spontaneous emission (ASE) noise summation and the generation of nonlinear interference (NLI) noise due to the erbium doped fibre amplifier (EDFA) and the number of channels. We optimize the optical SNR (OSNR) for computed NLI and ASE noise on coherent uncompensated optical transmission systems (CUOTS) considering four different commercial optical fibre types (SSMF, PSCF150, LEAF, and SMFULL). The bit error rate (BER) is computed for obtained OSNR considering PM-BPSK, PM-QPSK, and PM-16QAM modulation formats where each format runs at 32 GBaud symbol rate.

International Journal of Electrical and Computer Engineering (IJECE)

Traffic congestion has been one of the major performance limiting factors of heterogeneous networ... more Traffic congestion has been one of the major performance limiting factors of heterogeneous networks (HetNets). There have been several load balancing schemes put up to solve this by balancing load among base stations (BSs), but they appear to be unfeasible due to the complexity required and other unsatisfactory performance aspects. Cell range extension (CRE) has been a promising technique to overcome this challenge. In this paper, a permutation based CRE technique is proposed to find the best possible formation of bias for BSs to achieve load balance among BSs. In comparison to the baseline scheme, results depict that the suggested method attains superior performance in terms of network load balancing and average throughput. The complexity of the suggested algorithm is considerably reduced in comparison to the proposed permutation based CRE method it is further modified from.

Indonesian Journal of Electrical Engineering and Computer Science

A wireless gigabit alliance (WiGig) is widely known for higher bandwidth which operates at 60GHz ... more A wireless gigabit alliance (WiGig) is widely known for higher bandwidth which operates at 60GHz unlicensed spectrum for super-fast data speed over short distances for millimeter-wave band application. This study offers an efficient, compact microstrip patch antenna for WiGig with a lesser return loss -50.45 dB (60 GHz). The gain and directivity of the proposed antenna are 13.01 dB and 13.42 dBi. It provides higher efficiency of around 91%. The proposed antenna also covers another mm-wave band that is at 95 GHz. The U.S. military uses electromagnetic radiation of 95 GHz as a non-lethal weapon. So, the anticipated antenna can be used for a miniaturized active denial system. The proposed antenna has a good gain, directivity, and efficiency for the multigigabits/s data rate. The aforesaid properties imply that it can be used for wireless personal area networks (WPAN) and wireless local area network (WLAN) and fifth-generation (5G) applications too.

Farmers in the Chattogram Hill Tracts (CHT) practice jhum farming raising several crops together ... more Farmers in the Chattogram Hill Tracts (CHT) practice jhum farming raising several crops together with upland rice being dominant. For regenerating soil fertility farmers leave the plot fallow moving to another plot. In recent years shortening of fallow length resulted in declining land productivity impacting negatively on jhum farmers’ food security. This paper mapped out the food security status of jhum farmers conducting a survey of 103 farmers across 23 villages (para) in four subdistricts of Bandarban district. Farms and farmers growing jhum crops were selected. Assessment of farmers’ household demography and level of food security was made conducting questionnaire-based survey and FGDs. Rice yields were estimated harvesting sample plots from the selected farmers’ fields. Majority of the households (83%) had 3-6 members per family and 74% households were headed by male farmers but women take on major responsibility of jhum farming. More than 56% household heads had no formal sch...

Rajshahi University Journal of Science and Engineering, 2015

In this paper we have analyzed the Gaussian Non-linear Interference (G_NLI)... more In this paper we have analyzed the Gaussian Non-linear Interference (G_NLI) spectrum considering non identical channels, non-identical links and Amplified Spontaneous Emission (ASE) noise power spectrum for Coherent Optical Transmission Network (COTN) to calculate the Optical Signal to Noise Ratio (OSNR) and Quality (Q) values. In this study, three different Baud rate values (13.875Gbaud, 27.75Gbaud, and 55.5Gbaud) are considered to compute the Q values and OSNR in the COTN. Consequently, the COTN produces 111 Gb/s, 222 Gb/s and 444 Gb/s line rates for three different Baud rate values (13.875Gbaud, 27.75Gbaud, and 55.5Gbaud) respectively in PM-16QAM modulation format. It is confirmed that the OSNR is always greater than Q values. It is also found that the differences between OSNR and Q are 0.23dB, 1.73dB, and 3.24dB for 111Gb/s, 222Gb/s and 444Gb/s line rates respectively. Here transmission of launch power per span, number of channels, number of spans and the f...

2014 International Conference on Electrical Engineering and Information & Communication Technology, 2014

In this paper, we analyse the theoretical performance of uncompensated optical transmission syste... more In this paper, we analyse the theoretical performance of uncompensated optical transmission system using Gaussian Noise (GN) model considering the effect of amplified spontaneous emission (ASE) noise summation and the generation of nonlinear interference (NLI) noise due to the erbium doped fibre amplifier (EDFA) and the number of channels. We optimize the optical SNR (OSNR) for computed NLI and ASE noise on coherent uncompensated optical transmission systems (CUOTS) considering four different commercial optical fibre types (SSMF, PSCF150, LEAF, and SMFULL). The bit error rate (BER) is computed for obtained OSNR considering PM-BPSK, PM-QPSK, and PM-16QAM modulation formats where each format runs at 32 GBaud symbol rate.