Dahiru Shuaibu | Bayero University, Kano (original) (raw)

Papers by Dahiru Shuaibu

Recently there has been an alarming increase in demand for wireless video streaming and the need ... more Recently there has been an alarming increase in demand for wireless video streaming and the need to provide the required quality of service (QoS) to support video applications is very crucial. It is obvious that supporting multimedia applications and services over wireless is very challenging task due to network heterogeneity and different QoS requirements. This requires low complexity and highly efficient optimization scheme to cope with the unpredictable channel condition. This paper is aimed at developing a biologically-inspired scheme using particle swarm optimization (PSO) to achieve optimal video streaming. The optimal parameters configuration selected provide the best settings to enhance the video streaming quality over wireless LAN. The scenario has been simulated in NS-2 environment, it clearly shows that the video quality has been improve by selecting best configuration to ultimately support video application. The PSO-based approach outperforms other techniques used to com...

2018 2nd International Conference on Telematics and Future Generation Networks (TAFGEN), 2018

An antenna is one of solution for wireless devices which can be proposed for future 5G systems fo... more An antenna is one of solution for wireless devices which can be proposed for future 5G systems for high data rate broadband, communications. The antenna system can be design for multiple-input-multiple-output (MIMO) system at a waveband of millimeter (mm) range. The MIMO system consists of the mm-wave array of 2 by 1 slot antennas. The combination of the antenna array system covers the range of frequency from 83.581GHz to 86.483GHz of mmwave band at 85 GHz. The antenna array dimension is 0.94 mm by 2.28 mm by 0.16 mm. Results obtained from simulation across the 5G band showed peak gain values of 5.82dBi, VSWR of 1.09 with-10dB return loss of-27.5dB.

International Journal of Communication Networks and Information Security (IJCNIS)

Wireless communication technologies are rapidly being adopted and developed by countries all over... more Wireless communication technologies are rapidly being adopted and developed by countries all over the world as a strategy for sustaining a digital economy. This has proven very useful for economic recovery from the crises brought about by the COVID-19 pandemic of the year 2020. The latency and coverage area of a wireless network are two major areas that are always seeking improvement. The High Altitude Platform communication technology can provide improvement in speed and coverage area for 4G cellular systems. This work investigated the effect of positioning High Altitude Platforms on the latency and coverage of 4G cellular Systems. A quantitative approach was used in the methodology of this paper. A HAP model showing a single platform flying in a circular trajectory over Base Transceiver Stations BTSs and serving as a relay mobile station was presented. A detailed simulation algorithm for the HAP and results for the simulation were given. Results showed that using the HAP as a rela...

Recently there has been an alarming increase in demand for wireless video streaming and the need ... more Recently there has been an alarming increase in demand for wireless video streaming and the need to provide the required quality of service (QoS) to support video applications is very crucial. It is obvious that supporting multimedia applications and services over wireless is very challenging task due to network heterogeneity and different QoS requirements. This requires low complexity and highly efficient optimization scheme to cope with the unpredictable channel condition. This paper is aimed at developing a biologically-inspired scheme using particle swarm optimization (PSO) to achieve optimal video streaming. The optimal parameters configuration selected provide the best settings to enhance the video streaming quality over wireless LAN. The scenario has been simulated in NS-2 environment, it clearly shows that the video quality has been improve by selecting best configuration to ultimately support video application. The PSO-based approach outperforms other techniques used to com...

Worldwide interoperability for Microwave Access (WiMAX) is one of the broadband wireless technolo... more Worldwide interoperability for Microwave Access (WiMAX) is one of the broadband wireless technologies that uses Orthogonal Frequency Division Multiple Access (OFDMA) and is anticipated to be a viable alternative to traditional wired broadband technique due to it is cost efficiency. It has been an emerging wireless broadband technology, in which the resources are limited. Thus, there is dramatic need to effectively manage the available resources and provide the necessary Quality of Service (QoS) for different traffic classes. Therefore, an effective admission control, scheduling and resource allocation are critical for the WiMAX network. The first contribution of this thesis is the development of link aware call admission control with service differentiation. The total link bandwidth is partitioned into portions such that each portion is dedicated to unique traffic. The amount of bandwidth dedicated to each portion is based on the probability mass function of the traffic arrival rate. A traffic can only be admitted when there is enough bandwidth in the portion allocated to that particular traffic. Firstly a two partitions call admission control is considered called dual partition call admission control. The scheme primarily partitioned the bandwidth into constant bit rate and variable bit rate traffics. Simulation result shows 63.63% increment in service flow acceptance and 21.42% reduction in blocking probability when compared to conventional call admission control. To accommodate handover services, partition base call admission control (PB CAC) is proposed. By allocating a third bandwidth portion for handover, service flow acceptance increased by 25%, with reduction of both blocking and dropping probability by 15.63% and 21.66% respectively. By using fuzzy logic in PB CAC, the dropping probability is reduced by 51.60%. The second contribution is the enhancement of the earliest deadline first (EDF) scheduling algorithm. The enhancement is based on the criterion for buffer selection in which the earliest deadline first scheduler should serve. The criterion for scheduling a packet depends on the queuing state and the QoS requirement of a particular service flow. The proposed algorithm utilizes link quality and is called link and queuing aware EDF scheduling algorithm (LQA-EDF). The modified algorithm outperformed the conventional EDF by about 5.77% in terms of throughput with fairness among service flows. The third contribution is the development of subcarrier and power allocation algorithm with aim of reducing the computational complexity. The allocation of subcarrier uses unsorted list technique by using biologically inspired algorithm which is based on particle swarm optimization. The power allocation employs the conventional water filling algorithm for optimal power distribution among users. The proposed technique has reduced the computational complexity by 31.2% compared to linear technique which uses sorted list and by 90.5% compared to root finding method.

Proceedings of the 12th International Conference on Advanced Communication Technology, Feb 7, 2010

Transmission errors have detrimental impact on video quality in wireless network. Hence, this req... more Transmission errors have detrimental impact on video quality in wireless network. Hence, this requires highly efficient error correction scheme to significantly improve the quality of the media content. Deploying error correction technique alone would not strategically eradicate the problem unless some adaptation mechanism has been included in order to make efficient decision while adding more redundant information base on the channel condition. Adapting with channel condition can significantly enhance the network performance and video quality as well. In this paper, we paper presents an approach using forward error correction and cross layer mechanism which dynamically adapts with the channel condition to recover the loss packets in order to enhance the perceived video quality. The scheme has been developed and tested on NS-2 simulator and it shows more dramatic improvement in video quality.

IOSR Journal of Electronics and Communication Engineering, 2012

Chromatic dispersion and fiber attenuation pose a great problem in the detection of optical signa... more Chromatic dispersion and fiber attenuation pose a great problem in the detection of optical signals. Dispersion causes pulse broadening which limits the information carrying capacity of the fiber while attenuation limits the maximum transmission distance along the fiber. An approximate Gaussian pulse propagation model is obtained from the solution of Nonlinear Schrödinger Equation to represent the effects of chromatic dispersion and attenuation using Split-Step Fourier Method. It was found that pulse broadening and intensity loss in the optical signal is increasing proportionately with the propagation length of the fiber and this is what contributes to the causes of detection errors at the receiver.

International Journal of Computer Applications, 2012

International Journal of Computer Applications, 2010

In recent advancement in communication, it was made possible that many heterogeneous wireless net... more In recent advancement in communication, it was made possible that many heterogeneous wireless networks can be made to operate in one wireless network by establishing standard for each wireless traffic. Slots allocation in such network is one of the challenges since each traffic has its own quality of service requirements. In this paper we present slot allocation algorithm for real time and none real time traffic of mobile WiMAX. Since the wireless link of the network is a function of time, the allocation of the slot is based on the condition of the wireless link. Hence we estimate the wireless link based on the total path loss and the SNR value of the packet to be scheduled. The simulation shows that the proposed algorithm has achieved higher throughput.

2012 International Symposium on Telecommunication Technologies, 2012

ABSTRACT Mobile WiMAX has the capability to support high transmission rate at vehicle speed and p... more ABSTRACT Mobile WiMAX has the capability to support high transmission rate at vehicle speed and provides quality of service (QoS) for different applications. However, allocating the limited resources in such wireless network to different application with variant QoS is highly complex and challenging. Many resource allocation schemes have been proposed for different wireless based network. In most cases the proposed algorithms are found to have higher complexity. In this paper, a less complex algorithm for subcarrier allocation is proposed. The proposed subcarrier allocation scheme uses biologically inspired optimization technique to reduce the overall complexity and provides adjustable quality of service for transmission in different applications. The proposed subcarrier allocation technique has reduced the overall computational time by 89.8% compared to root-finding method and 33.8% when compared to linear search technique.

The gain flattening of Erbium – doped fiber amplifiers (EDFA) has been a research issue in recent... more The gain flattening of Erbium – doped fiber amplifiers (EDFA) has been a research issue in recent years with the development of high capacity wavelength division multiplexing (WDM) optical communication systems. As the number of channel increases, in the WDM systems, transmission problems arises such as reduced effective transmission bandwidth and system performance degradation because a conventional EDFA has intrinsic non uniform gain. The gain of EDFA depends on large number of parameters such as erbium-ions concentration, erbium-doped fiber length, pump power and core radius. We achieved average gain of 23dB, gain flatness of 0.299 dB, noise figure <6 dB and output signal power of about 8mW for 16 channels simultaneous amplification in a single stage EDFA by controlling the fiber length and pump power. The gains are flattened over 12 nm from 1546 nm to 1558 nm. The system is simulated using OPTISYSTEM software

2011 Fourth International Conference on Modeling, Simulation and Applied Optimization, 2011

Packet scheduling in wireless network is one of the issues that requires attention to quality of ... more Packet scheduling in wireless network is one of the issues that requires attention to quality of service provision (QoS). In heterogeneous wireless network, whereby many packets of different QoS are involved, packet scheduling becomes more difficult. This paper presents packet scheduling algorithm that uses earliest deadline first for scheduling constant bit rate packets. We estimate the wireless link based on the total path loss and obtain SNR value of the packet for scheduling. The simulation shows that the proposed algorithm has achieved higher throughput.

Communications in Computer and Information Science, 2011

Page 1. T.-h. Kim et al. (Eds.): FGCN 2011, Part I, CCIS 265, pp. 188???197, 2011. ?? Springer-Ve... more Page 1. T.-h. Kim et al. (Eds.): FGCN 2011, Part I, CCIS 265, pp. 188???197, 2011. ?? Springer-Verlag Berlin Heidelberg 2011 Biologically-Inspired Optimal Video Streaming over Wireless LAN Yakubu S. Baguda, Norsheila Fisal ...

Construction Management and Economics, 2010

Reduction in construction project duration is generally linked to additional cost due to more exp... more Reduction in construction project duration is generally linked to additional cost due to more expensive resources required. Hence tradeoff between time and cost is crucial to the efficiency of a construction project. The time‐cost tradeoff (TCT) issue has been studied through various multi‐objective optimization methodologies to determine an optimal set of activity methods with the objectives of minimizing project duration and total cost. A multi‐objective particle swarm optimization that adopts a combined scheme for determining the global best of each particle is presented for solving the TCT problem. The candidate TCT solutions in terms of a set of construction methods for activities are represented through the multidimensional particles. The framework of the combined scheme‐based multi‐objective particle swarm optimization (CSMOPSO) is developed. Computational analyses are conducted to investigate the performance of the CSMOPSO, including comparison with other methods. This study is expected to provide an alternative solving methodology for the TCT problem and help contractors or engineers plan construction methods with optimal time–cost tradeoff.

… on Computers and Software (I. RE. …, 2007

Abstract–Providing quality of service to subscribers in wireless communication is one of the majo... more Abstract–Providing quality of service to subscribers in wireless communication is one of the major issues in these days. An efficient packet scheduling algorithm in wireless network is one of the issues that require attention to quality of service provision. In heterogeneous ...

International Journal of …, 2011

Allocating slots dynamically to the service flows in heterogeneous wireless network is highly com... more Allocating slots dynamically to the service flows in heterogeneous wireless network is highly complex and non-linear. Since the link quality is continuously changing, a wireless network employing adaptive modulation like WiMAX, allocating slot in such network is ...

… and Software (I. RE. CO. S), 2010

Abstract–WiMAX is a broadband wireless technology that uses base station like the present GSM. Wi... more Abstract–WiMAX is a broadband wireless technology that uses base station like the present GSM. WiMAX offers services to different traffic classes with different quality of services requirements. Unlike GSM, five different traffics were identified in WiMAX in which all ...

… and Software (I. RE. CO. S), 2007

... Abstract – Due to robust wireless channel, bandwidth management has become an important issue... more ... Abstract – Due to robust wireless channel, bandwidth management has become an important issue in wireless broadband networks such as WiMAX. ... In both [8] and [12], the handover traffics have not been included which is very crucial in WiMAX network. ...

This paper primarily presents detailed design and implementation of a low complex magnetic levita... more This paper primarily presents detailed design and implementation of a low complex magnetic levitation system which can be used in laboratory for levitation experiments. The system transfer function was derived from the coenergy and the mathematical model of the state space ...

Abstract— This paper primarily describes the Partial Usage Subchannel (PUSC) slot of IEEE802.16e ... more Abstract— This paper primarily describes the Partial Usage Subchannel (PUSC) slot of IEEE802.16e PHY modeling and mapping subcarriers to the frame. The OFDMA symbol was divided into odd number and even number symbols for simulation purpose. Cyclic prefix ...

Recently there has been an alarming increase in demand for wireless video streaming and the need ... more Recently there has been an alarming increase in demand for wireless video streaming and the need to provide the required quality of service (QoS) to support video applications is very crucial. It is obvious that supporting multimedia applications and services over wireless is very challenging task due to network heterogeneity and different QoS requirements. This requires low complexity and highly efficient optimization scheme to cope with the unpredictable channel condition. This paper is aimed at developing a biologically-inspired scheme using particle swarm optimization (PSO) to achieve optimal video streaming. The optimal parameters configuration selected provide the best settings to enhance the video streaming quality over wireless LAN. The scenario has been simulated in NS-2 environment, it clearly shows that the video quality has been improve by selecting best configuration to ultimately support video application. The PSO-based approach outperforms other techniques used to com...

2018 2nd International Conference on Telematics and Future Generation Networks (TAFGEN), 2018

An antenna is one of solution for wireless devices which can be proposed for future 5G systems fo... more An antenna is one of solution for wireless devices which can be proposed for future 5G systems for high data rate broadband, communications. The antenna system can be design for multiple-input-multiple-output (MIMO) system at a waveband of millimeter (mm) range. The MIMO system consists of the mm-wave array of 2 by 1 slot antennas. The combination of the antenna array system covers the range of frequency from 83.581GHz to 86.483GHz of mmwave band at 85 GHz. The antenna array dimension is 0.94 mm by 2.28 mm by 0.16 mm. Results obtained from simulation across the 5G band showed peak gain values of 5.82dBi, VSWR of 1.09 with-10dB return loss of-27.5dB.

International Journal of Communication Networks and Information Security (IJCNIS)

Wireless communication technologies are rapidly being adopted and developed by countries all over... more Wireless communication technologies are rapidly being adopted and developed by countries all over the world as a strategy for sustaining a digital economy. This has proven very useful for economic recovery from the crises brought about by the COVID-19 pandemic of the year 2020. The latency and coverage area of a wireless network are two major areas that are always seeking improvement. The High Altitude Platform communication technology can provide improvement in speed and coverage area for 4G cellular systems. This work investigated the effect of positioning High Altitude Platforms on the latency and coverage of 4G cellular Systems. A quantitative approach was used in the methodology of this paper. A HAP model showing a single platform flying in a circular trajectory over Base Transceiver Stations BTSs and serving as a relay mobile station was presented. A detailed simulation algorithm for the HAP and results for the simulation were given. Results showed that using the HAP as a rela...

Recently there has been an alarming increase in demand for wireless video streaming and the need ... more Recently there has been an alarming increase in demand for wireless video streaming and the need to provide the required quality of service (QoS) to support video applications is very crucial. It is obvious that supporting multimedia applications and services over wireless is very challenging task due to network heterogeneity and different QoS requirements. This requires low complexity and highly efficient optimization scheme to cope with the unpredictable channel condition. This paper is aimed at developing a biologically-inspired scheme using particle swarm optimization (PSO) to achieve optimal video streaming. The optimal parameters configuration selected provide the best settings to enhance the video streaming quality over wireless LAN. The scenario has been simulated in NS-2 environment, it clearly shows that the video quality has been improve by selecting best configuration to ultimately support video application. The PSO-based approach outperforms other techniques used to com...

Worldwide interoperability for Microwave Access (WiMAX) is one of the broadband wireless technolo... more Worldwide interoperability for Microwave Access (WiMAX) is one of the broadband wireless technologies that uses Orthogonal Frequency Division Multiple Access (OFDMA) and is anticipated to be a viable alternative to traditional wired broadband technique due to it is cost efficiency. It has been an emerging wireless broadband technology, in which the resources are limited. Thus, there is dramatic need to effectively manage the available resources and provide the necessary Quality of Service (QoS) for different traffic classes. Therefore, an effective admission control, scheduling and resource allocation are critical for the WiMAX network. The first contribution of this thesis is the development of link aware call admission control with service differentiation. The total link bandwidth is partitioned into portions such that each portion is dedicated to unique traffic. The amount of bandwidth dedicated to each portion is based on the probability mass function of the traffic arrival rate. A traffic can only be admitted when there is enough bandwidth in the portion allocated to that particular traffic. Firstly a two partitions call admission control is considered called dual partition call admission control. The scheme primarily partitioned the bandwidth into constant bit rate and variable bit rate traffics. Simulation result shows 63.63% increment in service flow acceptance and 21.42% reduction in blocking probability when compared to conventional call admission control. To accommodate handover services, partition base call admission control (PB CAC) is proposed. By allocating a third bandwidth portion for handover, service flow acceptance increased by 25%, with reduction of both blocking and dropping probability by 15.63% and 21.66% respectively. By using fuzzy logic in PB CAC, the dropping probability is reduced by 51.60%. The second contribution is the enhancement of the earliest deadline first (EDF) scheduling algorithm. The enhancement is based on the criterion for buffer selection in which the earliest deadline first scheduler should serve. The criterion for scheduling a packet depends on the queuing state and the QoS requirement of a particular service flow. The proposed algorithm utilizes link quality and is called link and queuing aware EDF scheduling algorithm (LQA-EDF). The modified algorithm outperformed the conventional EDF by about 5.77% in terms of throughput with fairness among service flows. The third contribution is the development of subcarrier and power allocation algorithm with aim of reducing the computational complexity. The allocation of subcarrier uses unsorted list technique by using biologically inspired algorithm which is based on particle swarm optimization. The power allocation employs the conventional water filling algorithm for optimal power distribution among users. The proposed technique has reduced the computational complexity by 31.2% compared to linear technique which uses sorted list and by 90.5% compared to root finding method.

Proceedings of the 12th International Conference on Advanced Communication Technology, Feb 7, 2010

Transmission errors have detrimental impact on video quality in wireless network. Hence, this req... more Transmission errors have detrimental impact on video quality in wireless network. Hence, this requires highly efficient error correction scheme to significantly improve the quality of the media content. Deploying error correction technique alone would not strategically eradicate the problem unless some adaptation mechanism has been included in order to make efficient decision while adding more redundant information base on the channel condition. Adapting with channel condition can significantly enhance the network performance and video quality as well. In this paper, we paper presents an approach using forward error correction and cross layer mechanism which dynamically adapts with the channel condition to recover the loss packets in order to enhance the perceived video quality. The scheme has been developed and tested on NS-2 simulator and it shows more dramatic improvement in video quality.

IOSR Journal of Electronics and Communication Engineering, 2012

Chromatic dispersion and fiber attenuation pose a great problem in the detection of optical signa... more Chromatic dispersion and fiber attenuation pose a great problem in the detection of optical signals. Dispersion causes pulse broadening which limits the information carrying capacity of the fiber while attenuation limits the maximum transmission distance along the fiber. An approximate Gaussian pulse propagation model is obtained from the solution of Nonlinear Schrödinger Equation to represent the effects of chromatic dispersion and attenuation using Split-Step Fourier Method. It was found that pulse broadening and intensity loss in the optical signal is increasing proportionately with the propagation length of the fiber and this is what contributes to the causes of detection errors at the receiver.

International Journal of Computer Applications, 2012

International Journal of Computer Applications, 2010

In recent advancement in communication, it was made possible that many heterogeneous wireless net... more In recent advancement in communication, it was made possible that many heterogeneous wireless networks can be made to operate in one wireless network by establishing standard for each wireless traffic. Slots allocation in such network is one of the challenges since each traffic has its own quality of service requirements. In this paper we present slot allocation algorithm for real time and none real time traffic of mobile WiMAX. Since the wireless link of the network is a function of time, the allocation of the slot is based on the condition of the wireless link. Hence we estimate the wireless link based on the total path loss and the SNR value of the packet to be scheduled. The simulation shows that the proposed algorithm has achieved higher throughput.

2012 International Symposium on Telecommunication Technologies, 2012

ABSTRACT Mobile WiMAX has the capability to support high transmission rate at vehicle speed and p... more ABSTRACT Mobile WiMAX has the capability to support high transmission rate at vehicle speed and provides quality of service (QoS) for different applications. However, allocating the limited resources in such wireless network to different application with variant QoS is highly complex and challenging. Many resource allocation schemes have been proposed for different wireless based network. In most cases the proposed algorithms are found to have higher complexity. In this paper, a less complex algorithm for subcarrier allocation is proposed. The proposed subcarrier allocation scheme uses biologically inspired optimization technique to reduce the overall complexity and provides adjustable quality of service for transmission in different applications. The proposed subcarrier allocation technique has reduced the overall computational time by 89.8% compared to root-finding method and 33.8% when compared to linear search technique.

The gain flattening of Erbium – doped fiber amplifiers (EDFA) has been a research issue in recent... more The gain flattening of Erbium – doped fiber amplifiers (EDFA) has been a research issue in recent years with the development of high capacity wavelength division multiplexing (WDM) optical communication systems. As the number of channel increases, in the WDM systems, transmission problems arises such as reduced effective transmission bandwidth and system performance degradation because a conventional EDFA has intrinsic non uniform gain. The gain of EDFA depends on large number of parameters such as erbium-ions concentration, erbium-doped fiber length, pump power and core radius. We achieved average gain of 23dB, gain flatness of 0.299 dB, noise figure <6 dB and output signal power of about 8mW for 16 channels simultaneous amplification in a single stage EDFA by controlling the fiber length and pump power. The gains are flattened over 12 nm from 1546 nm to 1558 nm. The system is simulated using OPTISYSTEM software

2011 Fourth International Conference on Modeling, Simulation and Applied Optimization, 2011

Packet scheduling in wireless network is one of the issues that requires attention to quality of ... more Packet scheduling in wireless network is one of the issues that requires attention to quality of service provision (QoS). In heterogeneous wireless network, whereby many packets of different QoS are involved, packet scheduling becomes more difficult. This paper presents packet scheduling algorithm that uses earliest deadline first for scheduling constant bit rate packets. We estimate the wireless link based on the total path loss and obtain SNR value of the packet for scheduling. The simulation shows that the proposed algorithm has achieved higher throughput.

Communications in Computer and Information Science, 2011

Page 1. T.-h. Kim et al. (Eds.): FGCN 2011, Part I, CCIS 265, pp. 188???197, 2011. ?? Springer-Ve... more Page 1. T.-h. Kim et al. (Eds.): FGCN 2011, Part I, CCIS 265, pp. 188???197, 2011. ?? Springer-Verlag Berlin Heidelberg 2011 Biologically-Inspired Optimal Video Streaming over Wireless LAN Yakubu S. Baguda, Norsheila Fisal ...

Construction Management and Economics, 2010

Reduction in construction project duration is generally linked to additional cost due to more exp... more Reduction in construction project duration is generally linked to additional cost due to more expensive resources required. Hence tradeoff between time and cost is crucial to the efficiency of a construction project. The time‐cost tradeoff (TCT) issue has been studied through various multi‐objective optimization methodologies to determine an optimal set of activity methods with the objectives of minimizing project duration and total cost. A multi‐objective particle swarm optimization that adopts a combined scheme for determining the global best of each particle is presented for solving the TCT problem. The candidate TCT solutions in terms of a set of construction methods for activities are represented through the multidimensional particles. The framework of the combined scheme‐based multi‐objective particle swarm optimization (CSMOPSO) is developed. Computational analyses are conducted to investigate the performance of the CSMOPSO, including comparison with other methods. This study is expected to provide an alternative solving methodology for the TCT problem and help contractors or engineers plan construction methods with optimal time–cost tradeoff.

… on Computers and Software (I. RE. …, 2007

Abstract–Providing quality of service to subscribers in wireless communication is one of the majo... more Abstract–Providing quality of service to subscribers in wireless communication is one of the major issues in these days. An efficient packet scheduling algorithm in wireless network is one of the issues that require attention to quality of service provision. In heterogeneous ...

International Journal of …, 2011

Allocating slots dynamically to the service flows in heterogeneous wireless network is highly com... more Allocating slots dynamically to the service flows in heterogeneous wireless network is highly complex and non-linear. Since the link quality is continuously changing, a wireless network employing adaptive modulation like WiMAX, allocating slot in such network is ...

… and Software (I. RE. CO. S), 2010

Abstract–WiMAX is a broadband wireless technology that uses base station like the present GSM. Wi... more Abstract–WiMAX is a broadband wireless technology that uses base station like the present GSM. WiMAX offers services to different traffic classes with different quality of services requirements. Unlike GSM, five different traffics were identified in WiMAX in which all ...

… and Software (I. RE. CO. S), 2007

... Abstract – Due to robust wireless channel, bandwidth management has become an important issue... more ... Abstract – Due to robust wireless channel, bandwidth management has become an important issue in wireless broadband networks such as WiMAX. ... In both [8] and [12], the handover traffics have not been included which is very crucial in WiMAX network. ...

This paper primarily presents detailed design and implementation of a low complex magnetic levita... more This paper primarily presents detailed design and implementation of a low complex magnetic levitation system which can be used in laboratory for levitation experiments. The system transfer function was derived from the coenergy and the mathematical model of the state space ...

Abstract— This paper primarily describes the Partial Usage Subchannel (PUSC) slot of IEEE802.16e ... more Abstract— This paper primarily describes the Partial Usage Subchannel (PUSC) slot of IEEE802.16e PHY modeling and mapping subcarriers to the frame. The OFDMA symbol was divided into odd number and even number symbols for simulation purpose. Cyclic prefix ...