Sabira Khatun | Universiti Malaysia Perlis (UniMAP) (original) (raw)

Papers by Sabira Khatun

Research paper thumbnail of Design of single fed aperture coupled microstrip antennas for WLAN

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Research paper thumbnail of Data link control layer performance for variable packet size and fixed packet size (wireless ATM packet

This paper deals with the transmission of digital data in ATM like format over a noisy wireless c... more This paper deals with the transmission of digital data in ATM like format over a noisy wireless channel affected by burst of errors. It evaluates and compares go-back-N (GBN) and selective repeat (SR) for non-real time traffic over the wireless portion of the network for variable packet size and fixed packet size, and the effect of packet loss and check-sum error percentages on the throughput. Results show that SR-ARQ achieves better throughput under a wide variety of error rate conditions than GBN-ARQ

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Research paper thumbnail of Addition of Gaussian random signals for peak to average power ratio reduction in OFDM systems

This paper investigates the problem of peak-to-average power ratio (PAPR) in orthogonal frequency... more This paper investigates the problem of peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) system. It presents a new PAPR reduction method based on addition of power of random signals in a complex Gaussian distribution form to the data constellation points in frequency domain. The added signals alter the constellation shape by shifting the constellation points from their

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Research paper thumbnail of PHY and MAC, Cross-Layer optimization and Design

This document gives some definitions about PHY and MAC layer displaying its internal architecture... more This document gives some definitions about PHY and MAC layer displaying its internal architecture and major functions to both layers. And as the same time states some information about cross-layer design, discussing the architecture of the cross-layer, and focusing on major methods of interfacing with giving one example of data transmission and interfacing which is meant to be very useful in this stage. Each researcher may walk through some problems during time of enhancement and optimization for the cross-layer, so here we stated some challenges to solve some problems with concentrating on number of points of classifications for cross-layer solutions.

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Research paper thumbnail of An integrated scheme to improve performance of fast mobile IPv6 handover in IEEE 802.16e network

Abstract— IEEE 802.16e standard for mobile Worldwide Interoperability for Microwave Access (WiMAX... more Abstract— IEEE 802.16e standard for mobile Worldwide Interoperability for Microwave Access (WiMAX), defines the implementation of hard handover. The standard covers the physical and MAC layer. To apply the layer 3 (L3) handover protocol over the existing IEEE 802.16e ...

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Research paper thumbnail of RLS Channel Estimation and Tracking for MIMO extended IEEE 802.11a WLANs

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Research paper thumbnail of Bluetooth Based Wireless Remote Device Controlling and Data Acquisition

IrDA has been used for controlling devices and machines wirelessly at home, office and industry s... more IrDA has been used for controlling devices and machines wirelessly at home, office and industry so far. The most disadvantageous part in this case is the line of sight and only point to point communication where Bluetooth had opened the door far wider to these points. Because it doesn't have ...

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Research paper thumbnail of Modelling and Simulation of Phased Array Antenna for LEO Satellite Tracking

Nowadays achievements on mobile satellite systems (MSS) communication give a great concern for re... more Nowadays achievements on mobile satellite systems (MSS) communication give a great concern for research in global wireless communication fields. The developments of several Low Earth Orbit (LEO) satellite systems have promised worldwide connectivity with low delay real-time voice communications. Since the LEO satellite systems revolving around the Earth overlay mobile terminals (MT) or Earth stations over several minutes only, a sophisticated LEO satellite tracking must be introduced. Phased array antenna is seen to be the most promising solution. Although phased array antenna has been widely use for mobile cellular communication systems with advantages of its electronically beam steering, it is still not truly used in integrate with LEO MSS. In this paper, the mathematical model of phased array antenna is introduced for LEO satellite tracking purpose. Furthermore, the simulation of beam forming using phased array antenna is explored to obtain multiple and also steerable beams for tracking the satellite smoothly. Finally, a integration of phased array antenna in MT is proposed for future global wireless communication systems.

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Research paper thumbnail of Multicast based and fast handover scheme in mobile IPv6 wireless network

The main goal of mobile IPv6 is that a mobile node is always addressable by its home address, whe... more The main goal of mobile IPv6 is that a mobile node is always addressable by its home address, whether it is currently attached to its home link or is away from home. Mobile IPv6 enables applications running on an Internet node to survive physical reconnection by inserting a few additional features at the network layer. In this paper, focus is given to a micro-mobility based test-bed development with improved algorithm. The test-bed consists of both hardware and software, including four PCs and one laptop. The laptop is used as mobile host (MH), two PCs act as access points, one PC becomes the home agent (HA) and one PC is used as a multicast router (ML). This test-bed is used to verify the theoretical enhancement of the micro-mobility handover algorithm via the results (packet loss, handover delay and quality of service). There is no signaling traffic overload between the MH, HA and correspondent host (CH), the handover delay is low, approximately below 10 ms, and the video stream has good reception.

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Research paper thumbnail of Performance of Ultra-Wideband Time-of-Arrival Estimation Enhanced With Synchronization Scheme

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Research paper thumbnail of Centralized scheduling, routing tree in WiMAX mesh networks

In the last few years, demand for high speed internet access service has increased greatly so the... more In the last few years, demand for high speed internet access service has increased greatly so the IEEE 802.16 working group on broadband wireless access (BWA) is developing the worldwide interoperability for microwave access (WiMAX) standard for wireless metropolitan area networks (MANs) which aims to provide broadband wireless last mile access, easy deployment, and high speed data rate for large spanning area. This paper propose an efficient routing and collision free centralized scheduling (CS) algorithms using single channel single transceiver system in WiMAX mesh network, which introduces the cross layer concept between the network layer and media access controller (MAC) layer. The proposed approach has improved the system performance in the aspects of scheduling length, channel utilization ratio (CUR), and the throughput of the system.

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Research paper thumbnail of Joint Optimal Detection of Ordering SIC ZF and SIC ZF MAP for V-BLAST/STBC Wireless Communication Systems

... Jin , Hui Chong and Khatun, Sabira and Noordin, Nor Kamariah and Mohd Ali, Borhanuddin and Sy... more ... Jin , Hui Chong and Khatun, Sabira and Noordin, Nor Kamariah and Mohd Ali, Borhanuddin and Syed Junid, Syed Mansor (2008) Joint optimal detection of ordering SIC ZF and SIC ZF MAP for V-BLAST/STBC wireless communication systems. ...

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Research paper thumbnail of Authentication Model Based Bluetooth-enabled Mobile Phone

Journal of Computer Science, 2005

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Research paper thumbnail of Cognitive Radio Technology For Flexible Spectrum Sharing

Recent study by FCC Spectrum-Policy Task Force (SPTF) found that while the available spectrum bec... more Recent study by FCC Spectrum-Policy Task Force (SPTF) found that while the available spectrum becomes increasingly scarce, the assigned spectrum is significantly underutilized. Cognitive radio (CR) technology refers to a new type of radio hat uses real-time interaction with its environment to determine transmitter parameters such as frequency, power, and modulation. This paper presents a preliminary survey of CR with the goal of quantifying spectral occupancy and thereby gaining some insight into its feasibility. Two case studies were investigated: ultra-wide bandwidth technology as a transmission technique suitable for implementing a cognitive radio system was discussed, and a comparable measurement of TV spectrum band in an urban environment is also presented.

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Research paper thumbnail of Indoor propagation channel models for WLAN 802.11b at 2.4 GHz ISM band

For planning of indoor wireless LAN systems working in the 2.4 GHz ISM band, the signal propagati... more For planning of indoor wireless LAN systems working in the 2.4 GHz ISM band, the signal propagation prediction is needed. Empirical and semi-empirical models represent an efficient approach as opposed to deterministic models due to its simplicity and superiority in calculation time. For these models, suitable empirical parameters to characterize propagation channel must be provided. In this paper, an in building linear, one-slope (OS) empirical and semi-empirical multi-wall (MW) models are studied. Different types of MW models in the office and classroom like environment have been reported. OS purely account for attenuation of power law equation with distance while MW with additional attenuation due to obstacles such as wall, partition etc. The results and accuracy of those models are compared and discussed. The developed optimal indoor OS, MWC and MWE is then tuned to slope and MW model available in wireless simulation tool namely ICS Telecom

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Research paper thumbnail of Mobile IPV6 wireless test-bed experience

Mobility support for Internet devices is very important, since mobile computing is getting more w... more Mobility support for Internet devices is very important, since mobile computing is getting more widespread. Since these devices are wireless and therefore mobile, they will derive great benefit form mobile IPv6. Mobile IPv6 was designed to be a natural outgrowth of mobile IPv4, just as IPv6 itself was designed to be a natural outgrowth of IPv4. A wireless test-bed was setup to see the performance of the handover. The wireless test-bed consists of hardware, software and network analyzes tools to monitor the handover operation. The hardware consists of a multicast router, 2-access point, home agent, and mobile node. We analyzed packet loss, packet delay and handover delay in mobile IPv6 wireless test-bed. Finally, it is concluded the average packet delay is 0.7 s, the handover delay for the first handover (macro-mobility) is 4.4 s (44 packet loss) and 4.2 s (42 packet loss) during the second handover (micro-mobility). The behavior and performance of mobile IPv6 scheme can be seen.

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Research paper thumbnail of Ultra Wide Band (UWB) Ad-hoc Networks: Review and Trends

Journal of Computer Science, 2005

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Research paper thumbnail of Data Storage as a new perspective of future IP networks

This paper propose a novel approach to utilize the network to store data in form of floating IP p... more This paper propose a novel approach to utilize the network to store data in form of floating IP packets. Network could play the role of temporary storage in certain applications and packets could be retained in the network in a closed routing loop. This approach which is called Data Storage Technique on IP Networks (DSTN) could be considered as one of the new applications of future IP networks. With applying this technique, data could be accessed with least delay by intermediate forwarding nodes. This is a preliminary work to investigate the feasibility of the technique. Simulation results achieved by OpNet Modeller simulation tool and show that the generated traffic retained in the network for the complete simulation time. As the feasibility is tested, this technique can be implemented and tested on the real networks in the future.

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Research paper thumbnail of Low Voltage Cascode Current Mirror in a 1.8 GHz Variable Gain Low Noise Amplifier (VGLNA

A high frequency CMOS variable gain low noise amplifier (VGLNA) employing a low voltage cascode c... more A high frequency CMOS variable gain low noise amplifier (VGLNA) employing a low voltage cascode current mirror cell is proposed. The 'variable' concept is to prevent the unwanted saturation phenomenon due to large input signal. A design technique based on the proposed low voltage cascode cell consumes minimal voltage headroom without sacrificing the accuracy of the circuit. With a 0.18 mum CMOS technology, this technique is applied to design a 1.8 V VGLNA operating at 1.8 GHz for GSM band application. The simulation results reveal that the maximum gain is 15.18 dB with gain tuning range of 4.6 dB and noise figure is less than 1.9 dB with the power consumption of 74 mW

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Research paper thumbnail of Power amplifiers linearization based on digital predistortion with memory effects used in CDMA applications

Digital predistortion of a baseband signal is a well-known method of power amplifier (PA) lineari... more Digital predistortion of a baseband signal is a well-known method of power amplifier (PA) linearization used to reduce adjacent channel interference (ACI) in a non constant envelope modulation system. This paper discusses the application of adaptive digital baseband predistortion linearization to radio frequency (RF) power amplifiers (PAs) that exhibit memory effects. This technique is a highly cost- effective way to linearize Power amplifiers (PAs), but most existing architectures assume that the PA has a memoryless nonlinearity. For wider bandwidth applications such as wideband code-division multiple access (WCDMA) or wideband orthogonal frequency-division multiplexing (W- OFDM), PA memory effects can no longer be ignored. In this paper a new technique for adaptation of digital predistorter that considers memory effects in power amplifiers is proposed. This method is a combination of two techniques, memory polynomial predistortion and slope-dependent method. This new technique is validated by using a 1.9 GHz 60 W LDMOS power amplifier and various signals such as 2- carrier CDMA and 3-carrier CDMA.

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Research paper thumbnail of Design of single fed aperture coupled microstrip antennas for WLAN

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Research paper thumbnail of Data link control layer performance for variable packet size and fixed packet size (wireless ATM packet

This paper deals with the transmission of digital data in ATM like format over a noisy wireless c... more This paper deals with the transmission of digital data in ATM like format over a noisy wireless channel affected by burst of errors. It evaluates and compares go-back-N (GBN) and selective repeat (SR) for non-real time traffic over the wireless portion of the network for variable packet size and fixed packet size, and the effect of packet loss and check-sum error percentages on the throughput. Results show that SR-ARQ achieves better throughput under a wide variety of error rate conditions than GBN-ARQ

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Research paper thumbnail of Addition of Gaussian random signals for peak to average power ratio reduction in OFDM systems

This paper investigates the problem of peak-to-average power ratio (PAPR) in orthogonal frequency... more This paper investigates the problem of peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) system. It presents a new PAPR reduction method based on addition of power of random signals in a complex Gaussian distribution form to the data constellation points in frequency domain. The added signals alter the constellation shape by shifting the constellation points from their

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Research paper thumbnail of PHY and MAC, Cross-Layer optimization and Design

This document gives some definitions about PHY and MAC layer displaying its internal architecture... more This document gives some definitions about PHY and MAC layer displaying its internal architecture and major functions to both layers. And as the same time states some information about cross-layer design, discussing the architecture of the cross-layer, and focusing on major methods of interfacing with giving one example of data transmission and interfacing which is meant to be very useful in this stage. Each researcher may walk through some problems during time of enhancement and optimization for the cross-layer, so here we stated some challenges to solve some problems with concentrating on number of points of classifications for cross-layer solutions.

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Research paper thumbnail of An integrated scheme to improve performance of fast mobile IPv6 handover in IEEE 802.16e network

Abstract— IEEE 802.16e standard for mobile Worldwide Interoperability for Microwave Access (WiMAX... more Abstract— IEEE 802.16e standard for mobile Worldwide Interoperability for Microwave Access (WiMAX), defines the implementation of hard handover. The standard covers the physical and MAC layer. To apply the layer 3 (L3) handover protocol over the existing IEEE 802.16e ...

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Research paper thumbnail of RLS Channel Estimation and Tracking for MIMO extended IEEE 802.11a WLANs

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Research paper thumbnail of Bluetooth Based Wireless Remote Device Controlling and Data Acquisition

IrDA has been used for controlling devices and machines wirelessly at home, office and industry s... more IrDA has been used for controlling devices and machines wirelessly at home, office and industry so far. The most disadvantageous part in this case is the line of sight and only point to point communication where Bluetooth had opened the door far wider to these points. Because it doesn't have ...

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Research paper thumbnail of Modelling and Simulation of Phased Array Antenna for LEO Satellite Tracking

Nowadays achievements on mobile satellite systems (MSS) communication give a great concern for re... more Nowadays achievements on mobile satellite systems (MSS) communication give a great concern for research in global wireless communication fields. The developments of several Low Earth Orbit (LEO) satellite systems have promised worldwide connectivity with low delay real-time voice communications. Since the LEO satellite systems revolving around the Earth overlay mobile terminals (MT) or Earth stations over several minutes only, a sophisticated LEO satellite tracking must be introduced. Phased array antenna is seen to be the most promising solution. Although phased array antenna has been widely use for mobile cellular communication systems with advantages of its electronically beam steering, it is still not truly used in integrate with LEO MSS. In this paper, the mathematical model of phased array antenna is introduced for LEO satellite tracking purpose. Furthermore, the simulation of beam forming using phased array antenna is explored to obtain multiple and also steerable beams for tracking the satellite smoothly. Finally, a integration of phased array antenna in MT is proposed for future global wireless communication systems.

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Research paper thumbnail of Multicast based and fast handover scheme in mobile IPv6 wireless network

The main goal of mobile IPv6 is that a mobile node is always addressable by its home address, whe... more The main goal of mobile IPv6 is that a mobile node is always addressable by its home address, whether it is currently attached to its home link or is away from home. Mobile IPv6 enables applications running on an Internet node to survive physical reconnection by inserting a few additional features at the network layer. In this paper, focus is given to a micro-mobility based test-bed development with improved algorithm. The test-bed consists of both hardware and software, including four PCs and one laptop. The laptop is used as mobile host (MH), two PCs act as access points, one PC becomes the home agent (HA) and one PC is used as a multicast router (ML). This test-bed is used to verify the theoretical enhancement of the micro-mobility handover algorithm via the results (packet loss, handover delay and quality of service). There is no signaling traffic overload between the MH, HA and correspondent host (CH), the handover delay is low, approximately below 10 ms, and the video stream has good reception.

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Research paper thumbnail of Performance of Ultra-Wideband Time-of-Arrival Estimation Enhanced With Synchronization Scheme

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Research paper thumbnail of Centralized scheduling, routing tree in WiMAX mesh networks

In the last few years, demand for high speed internet access service has increased greatly so the... more In the last few years, demand for high speed internet access service has increased greatly so the IEEE 802.16 working group on broadband wireless access (BWA) is developing the worldwide interoperability for microwave access (WiMAX) standard for wireless metropolitan area networks (MANs) which aims to provide broadband wireless last mile access, easy deployment, and high speed data rate for large spanning area. This paper propose an efficient routing and collision free centralized scheduling (CS) algorithms using single channel single transceiver system in WiMAX mesh network, which introduces the cross layer concept between the network layer and media access controller (MAC) layer. The proposed approach has improved the system performance in the aspects of scheduling length, channel utilization ratio (CUR), and the throughput of the system.

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Research paper thumbnail of Joint Optimal Detection of Ordering SIC ZF and SIC ZF MAP for V-BLAST/STBC Wireless Communication Systems

... Jin , Hui Chong and Khatun, Sabira and Noordin, Nor Kamariah and Mohd Ali, Borhanuddin and Sy... more ... Jin , Hui Chong and Khatun, Sabira and Noordin, Nor Kamariah and Mohd Ali, Borhanuddin and Syed Junid, Syed Mansor (2008) Joint optimal detection of ordering SIC ZF and SIC ZF MAP for V-BLAST/STBC wireless communication systems. ...

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Research paper thumbnail of Authentication Model Based Bluetooth-enabled Mobile Phone

Journal of Computer Science, 2005

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Research paper thumbnail of Cognitive Radio Technology For Flexible Spectrum Sharing

Recent study by FCC Spectrum-Policy Task Force (SPTF) found that while the available spectrum bec... more Recent study by FCC Spectrum-Policy Task Force (SPTF) found that while the available spectrum becomes increasingly scarce, the assigned spectrum is significantly underutilized. Cognitive radio (CR) technology refers to a new type of radio hat uses real-time interaction with its environment to determine transmitter parameters such as frequency, power, and modulation. This paper presents a preliminary survey of CR with the goal of quantifying spectral occupancy and thereby gaining some insight into its feasibility. Two case studies were investigated: ultra-wide bandwidth technology as a transmission technique suitable for implementing a cognitive radio system was discussed, and a comparable measurement of TV spectrum band in an urban environment is also presented.

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Research paper thumbnail of Indoor propagation channel models for WLAN 802.11b at 2.4 GHz ISM band

For planning of indoor wireless LAN systems working in the 2.4 GHz ISM band, the signal propagati... more For planning of indoor wireless LAN systems working in the 2.4 GHz ISM band, the signal propagation prediction is needed. Empirical and semi-empirical models represent an efficient approach as opposed to deterministic models due to its simplicity and superiority in calculation time. For these models, suitable empirical parameters to characterize propagation channel must be provided. In this paper, an in building linear, one-slope (OS) empirical and semi-empirical multi-wall (MW) models are studied. Different types of MW models in the office and classroom like environment have been reported. OS purely account for attenuation of power law equation with distance while MW with additional attenuation due to obstacles such as wall, partition etc. The results and accuracy of those models are compared and discussed. The developed optimal indoor OS, MWC and MWE is then tuned to slope and MW model available in wireless simulation tool namely ICS Telecom

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Mobile IPV6 wireless test-bed experience

Mobility support for Internet devices is very important, since mobile computing is getting more w... more Mobility support for Internet devices is very important, since mobile computing is getting more widespread. Since these devices are wireless and therefore mobile, they will derive great benefit form mobile IPv6. Mobile IPv6 was designed to be a natural outgrowth of mobile IPv4, just as IPv6 itself was designed to be a natural outgrowth of IPv4. A wireless test-bed was setup to see the performance of the handover. The wireless test-bed consists of hardware, software and network analyzes tools to monitor the handover operation. The hardware consists of a multicast router, 2-access point, home agent, and mobile node. We analyzed packet loss, packet delay and handover delay in mobile IPv6 wireless test-bed. Finally, it is concluded the average packet delay is 0.7 s, the handover delay for the first handover (macro-mobility) is 4.4 s (44 packet loss) and 4.2 s (42 packet loss) during the second handover (micro-mobility). The behavior and performance of mobile IPv6 scheme can be seen.

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Research paper thumbnail of Ultra Wide Band (UWB) Ad-hoc Networks: Review and Trends

Journal of Computer Science, 2005

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Research paper thumbnail of Data Storage as a new perspective of future IP networks

This paper propose a novel approach to utilize the network to store data in form of floating IP p... more This paper propose a novel approach to utilize the network to store data in form of floating IP packets. Network could play the role of temporary storage in certain applications and packets could be retained in the network in a closed routing loop. This approach which is called Data Storage Technique on IP Networks (DSTN) could be considered as one of the new applications of future IP networks. With applying this technique, data could be accessed with least delay by intermediate forwarding nodes. This is a preliminary work to investigate the feasibility of the technique. Simulation results achieved by OpNet Modeller simulation tool and show that the generated traffic retained in the network for the complete simulation time. As the feasibility is tested, this technique can be implemented and tested on the real networks in the future.

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Research paper thumbnail of Low Voltage Cascode Current Mirror in a 1.8 GHz Variable Gain Low Noise Amplifier (VGLNA

A high frequency CMOS variable gain low noise amplifier (VGLNA) employing a low voltage cascode c... more A high frequency CMOS variable gain low noise amplifier (VGLNA) employing a low voltage cascode current mirror cell is proposed. The 'variable' concept is to prevent the unwanted saturation phenomenon due to large input signal. A design technique based on the proposed low voltage cascode cell consumes minimal voltage headroom without sacrificing the accuracy of the circuit. With a 0.18 mum CMOS technology, this technique is applied to design a 1.8 V VGLNA operating at 1.8 GHz for GSM band application. The simulation results reveal that the maximum gain is 15.18 dB with gain tuning range of 4.6 dB and noise figure is less than 1.9 dB with the power consumption of 74 mW

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Research paper thumbnail of Power amplifiers linearization based on digital predistortion with memory effects used in CDMA applications

Digital predistortion of a baseband signal is a well-known method of power amplifier (PA) lineari... more Digital predistortion of a baseband signal is a well-known method of power amplifier (PA) linearization used to reduce adjacent channel interference (ACI) in a non constant envelope modulation system. This paper discusses the application of adaptive digital baseband predistortion linearization to radio frequency (RF) power amplifiers (PAs) that exhibit memory effects. This technique is a highly cost- effective way to linearize Power amplifiers (PAs), but most existing architectures assume that the PA has a memoryless nonlinearity. For wider bandwidth applications such as wideband code-division multiple access (WCDMA) or wideband orthogonal frequency-division multiplexing (W- OFDM), PA memory effects can no longer be ignored. In this paper a new technique for adaptation of digital predistorter that considers memory effects in power amplifiers is proposed. This method is a combination of two techniques, memory polynomial predistortion and slope-dependent method. This new technique is validated by using a 1.9 GHz 60 W LDMOS power amplifier and various signals such as 2- carrier CDMA and 3-carrier CDMA.

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