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M B R Murthy

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Mary Jane Curry

University of Rochester

Kishor Chandra Satpathy

Indian Statistical Institute, Calcutta

Willy Sudiarto Raharjo

Duta Wacana Christian University

Kansas State University

Joshua M . Paiz

The George Washington University

Historic Environment Scotland

University of Karachi

RAJARAMBAPU INSTITUTE OF TECHNOLOGY,SAKHARALE MAHARASHTRA

German Research Center for Artificial Intelligence

Saidamin P Bagolong

Cotabato City State Polytechnic College

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Papers by M B R Murthy

A Parametric Study of Circular Monopole Antenna With Band Notching Characteristics

Social Science Research Network, Jul 1, 2018

Camera Movement Control Schema for Speaker Tracking

International Journal of Computer Trends and Technology, Oct 25, 2015

A Method for Diagnosis of Tuberculosis using Combined Blur and Affine Moment Invariants on Cavity Image

In the entire World 1/3 of people are infected with TB, which is caused by mycobacterium Tubercul... more In the entire World 1/3 of people are infected with TB, which is caused by mycobacterium Tuberculosis Bacteria and for every second one infection case is recording. The first attack of tuberculin bacterium in the Human body is on Lungs that can be indicated by small damaging portions called cavities. The intensity of TB infection is estimated by number of cavities and size of the cavity areas on lungs. Generally, the area of cavity has been detected by physician to know the effect of TB. In this paper a new automatic technique proposed for fast and accurate detection of TB disease with Computer-Aided Diagnosis (CAD) system using combine blur and affine moment Invariants (CBAMI). The CAD method not only provides second opinion to radiologist, but also accelerates the process of active case finding. This method consists of three major steps (1) image pre-processing (2) feature extraction (3) classification. The CBAMI are selected as features in this paper because they are invariant to...

Investigations on compact UWB monopole antenna

2017 International conference of Electronics, Communication and Aerospace Technology (ICECA), 2017

The advances in integrated circuits resulted in drastic reduction in size of electronic gadgets. ... more The advances in integrated circuits resulted in drastic reduction in size of electronic gadgets. This necessitated miniature size antennas for use with wireless communication equipments. Many researchers have worked and are working on printed monopole slot antennas to achieve small size and acceptable performance. In this regard several investigations are carried out to ascertain the effect of slot position on antenna performance. In addition to this bevel slots are cut at corners and its effect on antenna performance is studied. Compact wideband antennas are gaining popularity in view of their features like large bandwidth, low power consumption, low complexity, low cost etc. Many researches are working to obtain an optimum arrangement for the UWB monopole antenna. In this paper several configurations of wideband antennas are designed, tested and their performance is compared. One arrangement is a compact patch with slot cut at different locations. Another arrangement is the earlie...

Automobile Driver Safety Scheme

The continuous growth of vehicular traffic has led to increase in traffic density and higher chan... more The continuous growth of vehicular traffic has led to increase in traffic density and higher chances for road accidents of which some are fatal. In the road accidents some people succumb to injuries due to non availability of timely medical aid. There are various reasons for vehicle accidents like sudden mechanical break down or failure, over speeding, and drowsiness during driving etc. This paper is aimed at finding a solution to some of the above problems with an intention to avoid or at least minimize the accidents and arrange medical help at the earliest. KeywordsARM7micro-controller, GPS, GSM, MEMS sensor, Speed sensor, Ultrasonic sensor.

A Zigbee Based Patient Health Monitoring System

This paper, presents a Wireless Sensor Network (WSN) for monitoring patient’s physiological condi... more This paper, presents a Wireless Sensor Network (WSN) for monitoring patient’s physiological conditions continuously using Zigbee. Here the physiological conditions of the patient's are monitored by sensors and the output of these sensors is transmitted via Zigbee and the same has to be sent to the remote wireless monitor for acquiring the observed patient’s physiological signal. The remote wireless monitor is constructed of Zigbee and Personal Computer (PC). The measured signal has to be sent to the PC, which can be data collection. Although Bluetooth is better than Zigbee for transmission rate, Zigbee has lower power consumption. The first procedure of the system is that the wireless sensors are used to measure Heart rate, temperature and fall monitoring from human body using Zigbee. Next procedure of the system is to measure saline level in bottle using zigbee. The measured signal is sent to the PC via the RS-232 serial port communication interface. In particular, when measure...

Diagnosis of Tuberculosis Using Legendre Moment Invariants

Dual - Band Notched Semi Circular Monopole Antenna for UWB Applications

In this paper a compact semicircular monopole antenna is proposed for UWB applications. Generally... more In this paper a compact semicircular monopole antenna is proposed for UWB applications. Generally UWB antenna operates in the frequency range of (3.1-10.6 GHZ). To avoid interference between UWB and existing wireless communication systems, band rejection characteristics are proposed.In this paper the author has come up with two rejection bands one is WLAN (4.94-5.85 GHZ) and other one is International Telecommunication union (ITU) band (8.0-8.55 GHz). In the proposed work the semi-circular monopole patch antenna is excited with micro strip line feeding. To get required notching bands concentric rings are placed on the patch. The antenna design is simulated using CST microwave studio. Some of the important antenna parameters like Return losses, VSWR, Radiation pattern are measured.

Multi-Band Notched Antennas for UWB Applications

Radioelectronics and Communications Systems, 2019

A compact ultra-wideband circular monopole antennas with single, dual, triple and quad-band rejec... more A compact ultra-wideband circular monopole antennas with single, dual, triple and quad-band rejection characteristics are proposed in this paper. The antenna units are designed using RT/DUROID substrate with permittivity 2.2 and all are fed through a coplanar waveguide (CPW). In the proposed antennas splitted concentric rings (SCR) are used to achieve band rejection characteristics. The proposed antennas will reject the existing WLAN (Wireless Local Area Network), WiMAX (World Wide Interoperability for Microwave Access), X-band downlink satellite communication and radio-frequency channel arrangements for fixed wireless systems to avoid interference. Simulations are carried out using CST Wave Studio Suite 2016. Antenna performance parameters like return loss, VSWR, radiation pattern and gain are evaluated for all the antenna units. The antenna units having dimensions of 30´23´1.57 mm 3 are fabricated and tested. The simulated and tested results are compared and reported. These antenna units provide good gain and a larger bandwidth over the frequency range 3-11.6 GHz.

A Novel Dual - Band Notched Hexagonal Monopole Antenna for UWB Applications

International journal of simulation: systems, science & technology, 2019

We propose a compact ultra-wideband (UWB) hexagonal monopole antenna with dual band-notched chara... more We propose a compact ultra-wideband (UWB) hexagonal monopole antenna with dual band-notched characteristics. The design consists of a hexagonal radiating patch and a partial ground plane. In 2002 Federal communication commission assigned a frequency band of 3.1GHz-10.6 GHz for commercial applications. Our hexagonal radiating patch has dimensions 32x22x1.57 mm 3 and is printed on the RT/Duroid substrate with dielectric constant 2.2. Defected ground structure is used to achieve UWB characteristics. There are existing wireless technologies that use certain bands for their operation which lie within the Ultra-wide band. To achieve high data rates of transmission and to avoid interference between the existing bands, band notching characteristics are proposed. In order to achieve dual band notching inverted U-shaped slots are embedded on the patch to reject WiMAX band from (3.3-3.8) GHz and WLAN band (5.3-5.6GHZ). The dimensions of the slots are optimized and the antenna units are simulated using High Frequency Structure Simulator (HFSS). The antenna performance parameters such as Return loss, Gain, Directivity, Radiation pattern and VSWR are measured. The simulated antenna is fabricated and tested. The results are compared and reported.

Compact Penta Band Notched Antenna Using Concentric Rings with Splitter Bricks for Ultra Wide Band Applications

Journal of Communications Technology and Electronics, 2018

In this paper novel miniature ultra wide band circular mono pole antenna with penta band rejectio... more In this paper novel miniature ultra wide band circular mono pole antenna with penta band rejection characteristics is proposed. The antenna is fed through a Coplanar Waveguide (CPW) feed. The antenna is designed using RT/ DUROID substrate with permittivity 2.2. In the proposed antenna Concentric Rings with Splitter Bricks (CRSB) are used to achieve band notching characteristics. It will reject the existing WIMAX (Worldwide Interoperability for Microwave Access) from 3.326-3.612 GHz, C band down link frequency from 3.8-4.2 GHz, WLAN application from 5.393-5.822 GHz, X Band downlink Satellite communication application from 7.25-7.733 GHz and ITU band operations from 8.0-8.565 GHz. The Simulations of this antenna are carried out using CST microwave studio suite 2016. Antenna performance parameters like Return loss, Voltage standing wave ratio (VSWR), Radiation efficiency and Gain are evaluated. Radiation pattern of the antenna at different frequencies are observed. This antenna provides good gain and a larger band width over the frequency range 3.1-11.6 GHz.

Compact Hexagonal Monopole Antenna

Indian Journal of Science and Technology, 2017

Objective: The different configurations of hexagonal monopole antennas are designed, simulated, t... more Objective: The different configurations of hexagonal monopole antennas are designed, simulated, tested and their performance is compared. Method: Different Hexagonal monopole antennas are designed and simulated using HFSS, these antennas are designed using Defective Ground Structure (DGS) and slots are made in ground plane and on patch. Effect of slot position on performance of antenna is examined. The antenna units are studied through simulation two antennas were fabricated and its return loss and VSWR are measured. Findings: The antenna parameters like return losses, VSWR, Gain and Directivity are evaluated and return losses and VSWR for the fabricated antennas are measured. It is observed that over a wide frequency band the return losses are less than-10dB and VSWR is less than 2. Applications: These antennas can be used over UWB for Wireless and Indoor applications.

A Novel Scheme of Load Forecasting pertaining to long term Planning of a distribution system

TENCON 2005 - 2005 IEEE Region 10 Conference, 2005

ABSTRACT

Performance Study of Power Control Radio Resource Management Over WLANs

Journal of Computer Science, 2008

Wireless Local Area Networks (WLANs) based on IEEE 802.11 standard have been rapidly growing. Wit... more Wireless Local Area Networks (WLANs) based on IEEE 802.11 standard have been rapidly growing. With limitations of the WLAN standard and rapid increase in wireless application demand, the air interface acts as bottleneck even in high-speed WLAN standards such as IEEE 802.11a and 802.11g with expected data transmission rates of up to 54 Mbps. To improve the overall performance of IEEE 802.11 WLAN under large deployment and heavy application demand environment, Radio Resource Management (RRM) algorithms based on power control have been investigated and tested through simulation. The results show that controlling the Wireless Terminal's (WT) transmitter power to an optimum power level helps in increasing data throughput in WLANs and when the transmitter power level of a WT is increased beyond the optimum power level, the overall data throughputs drop drastically no matter how high the WT's transmitter power may be increased.

WLAN-GPRS Tight Coupling Based Interworking Architecture with Vertical Handoff Support

Wireless Personal Communications, 2006

There have been parallel technological developments in wireless local network (WLAN) and cellular... more There have been parallel technological developments in wireless local network (WLAN) and cellular wide area network (WAN) technologies. This is evidenced by the boom in fast WLANs enabled devices, the spread of 2.5 G networks and the increasing emergence 3 G communication networks, applications and terminals. The prospects of integrating WLAN and cellular WAN technologies with support for seamless handoffs between the two heterogeneous have changed the mentality of researchers from considering WLAN technology as a threat to the future of wide area cellular networks to accepting the technology as a complementary solution. A number of architectures for interworking the two different network types have been proposed mainly based on the loose coupling interworking approach recommended by the ETSI. One of the main weaknesses anticipated with loose coupling architecture is excessive handoff latency, which may lead to data loss, traffic congestion and handoff failure. In this paper an architecture for interworking WLAN and the GPRS networks, based on the ETSI tight coupling approach, is proposed.

Performance Analysis of Downward Handoff Latency in a WLAN/GPRS Interworking System

Journal of Computer Science, 2005

This study presents the performance analysis of a new tight coupling based WLAN/GPRS interworking... more This study presents the performance analysis of a new tight coupling based WLAN/GPRS interworking architecture. The effects of network traffic on downward handoff latency are investigated. The results indicate that increasing WLAN traffic increases the overall downward handoff latency more than increasing GPRS traffic. On the other hand, increasing GPRS traffic results in higher packet buffering requirements at the Serving GPRS Support Node (SGSN).

A scheme for efficient topology management of wireless ad hoc networks using the MARI algorithm

2008 16th IEEE International Conference on Networks, 2008

Wireless ad hoc networks consist of nodes which can communicate with each other in a peer-to-peer... more Wireless ad hoc networks consist of nodes which can communicate with each other in a peer-to-peer fashion over single hop or multi hops without any fixed infrastructure such as access point or base station. In flat topology there is no topology management concept and all the nodes participate in routing. In this paper the task of topology management for ad hoc networks is implemented using Routing Intelligence Mobile Agent (MARI) Algorithm and the performance is compared with that of flat topology network having same number nodes. In the proposed scheme the nodes with higher power levels among their one hop neighbors are selected as MARI nodes and these participate in routing. To provide communication between any two MARI nodes a midway node is selected. Only these MARI and midway nodes will stay awake and the remaining nodes will be in sleep mode so that there is power saving. In this paper, the power consumption and back off delay performance of a flat network and a network employing MARI algorithm are compared. The proposed MARI topology management is found to have less power consumption and less back-off delay as compared with flat topology.

Improved Performance of Traffic Dependent Outage Rate Cellular System

Journal of Computer Science, 2005

The designers of a mobile cellular system must evaluate the possible configurations of the system... more The designers of a mobile cellular system must evaluate the possible configurations of the system components and their characteristics in order to develop a system with greater efficiency. The useful parameters to estimate performances of the system are voice quality, frequency spectrum efficiency and grade of service (GOS). In this study, a scheme proposed to reduce the lost calls and interruptions due to the outage channels is tested in the traffic dependent outage rate wireless cellular system. In this scheme no call is dropped but could be delayed. The performance parameters considered for this study is the probability of delay and the mean waiting time for priority and nonpriority calls for non-preemptive type. The system is evaluated for different conditions and the results are discussed.

A new technique for street noise reduction in signal processing applications

TENCON 2008 - 2008 IEEE Region 10 Conference, 2008

... [11] K. Anitha Sheela, ch.V.Rama Rao, K.Satya Prasad and AVNTilak,A noise reduction Preproce... more

WPAN scheme for Bluetooth devices: a review

The use of Bluetooth (BT) devices is on increase. The conventional LAN techniques for networking ... more The use of Bluetooth (BT) devices is on increase. The conventional LAN techniques for networking do not suit the BT environment. We discuss the suitability of the wireless personal area network (WPAN) for BT devices. At the present time, users are surrounded by numerous portable devices, such as personal digital assistants (PDA), personal computers, digital camera, CD/VCD/MP3/DVD player, mobile phone, pager and microwave oven, in the home or office environment. The personal area network (PAN) is a network which connects these devices one to another without the need of cable. Information, which consists of data as well as voice, may flow seamlessly between these Bluetooth devices. A number of technologies exist to support these kind of wireless services in PAN, like Home RF, Infrared IrDa and Bluetooth. Due to its inherent merits, Bluetooth superseded its parallel counterparts. Bluetooth and WPAN technologies are reviewed as the basis for a proposal to develop a mathematical model fo...

A Parametric Study of Circular Monopole Antenna With Band Notching Characteristics

Social Science Research Network, Jul 1, 2018

Camera Movement Control Schema for Speaker Tracking

International Journal of Computer Trends and Technology, Oct 25, 2015

A Method for Diagnosis of Tuberculosis using Combined Blur and Affine Moment Invariants on Cavity Image

In the entire World 1/3 of people are infected with TB, which is caused by mycobacterium Tubercul... more In the entire World 1/3 of people are infected with TB, which is caused by mycobacterium Tuberculosis Bacteria and for every second one infection case is recording. The first attack of tuberculin bacterium in the Human body is on Lungs that can be indicated by small damaging portions called cavities. The intensity of TB infection is estimated by number of cavities and size of the cavity areas on lungs. Generally, the area of cavity has been detected by physician to know the effect of TB. In this paper a new automatic technique proposed for fast and accurate detection of TB disease with Computer-Aided Diagnosis (CAD) system using combine blur and affine moment Invariants (CBAMI). The CAD method not only provides second opinion to radiologist, but also accelerates the process of active case finding. This method consists of three major steps (1) image pre-processing (2) feature extraction (3) classification. The CBAMI are selected as features in this paper because they are invariant to...

Investigations on compact UWB monopole antenna

2017 International conference of Electronics, Communication and Aerospace Technology (ICECA), 2017

The advances in integrated circuits resulted in drastic reduction in size of electronic gadgets. ... more The advances in integrated circuits resulted in drastic reduction in size of electronic gadgets. This necessitated miniature size antennas for use with wireless communication equipments. Many researchers have worked and are working on printed monopole slot antennas to achieve small size and acceptable performance. In this regard several investigations are carried out to ascertain the effect of slot position on antenna performance. In addition to this bevel slots are cut at corners and its effect on antenna performance is studied. Compact wideband antennas are gaining popularity in view of their features like large bandwidth, low power consumption, low complexity, low cost etc. Many researches are working to obtain an optimum arrangement for the UWB monopole antenna. In this paper several configurations of wideband antennas are designed, tested and their performance is compared. One arrangement is a compact patch with slot cut at different locations. Another arrangement is the earlie...

Automobile Driver Safety Scheme

The continuous growth of vehicular traffic has led to increase in traffic density and higher chan... more The continuous growth of vehicular traffic has led to increase in traffic density and higher chances for road accidents of which some are fatal. In the road accidents some people succumb to injuries due to non availability of timely medical aid. There are various reasons for vehicle accidents like sudden mechanical break down or failure, over speeding, and drowsiness during driving etc. This paper is aimed at finding a solution to some of the above problems with an intention to avoid or at least minimize the accidents and arrange medical help at the earliest. KeywordsARM7micro-controller, GPS, GSM, MEMS sensor, Speed sensor, Ultrasonic sensor.

A Zigbee Based Patient Health Monitoring System

This paper, presents a Wireless Sensor Network (WSN) for monitoring patient’s physiological condi... more This paper, presents a Wireless Sensor Network (WSN) for monitoring patient’s physiological conditions continuously using Zigbee. Here the physiological conditions of the patient's are monitored by sensors and the output of these sensors is transmitted via Zigbee and the same has to be sent to the remote wireless monitor for acquiring the observed patient’s physiological signal. The remote wireless monitor is constructed of Zigbee and Personal Computer (PC). The measured signal has to be sent to the PC, which can be data collection. Although Bluetooth is better than Zigbee for transmission rate, Zigbee has lower power consumption. The first procedure of the system is that the wireless sensors are used to measure Heart rate, temperature and fall monitoring from human body using Zigbee. Next procedure of the system is to measure saline level in bottle using zigbee. The measured signal is sent to the PC via the RS-232 serial port communication interface. In particular, when measure...

Diagnosis of Tuberculosis Using Legendre Moment Invariants

Dual - Band Notched Semi Circular Monopole Antenna for UWB Applications

In this paper a compact semicircular monopole antenna is proposed for UWB applications. Generally... more In this paper a compact semicircular monopole antenna is proposed for UWB applications. Generally UWB antenna operates in the frequency range of (3.1-10.6 GHZ). To avoid interference between UWB and existing wireless communication systems, band rejection characteristics are proposed.In this paper the author has come up with two rejection bands one is WLAN (4.94-5.85 GHZ) and other one is International Telecommunication union (ITU) band (8.0-8.55 GHz). In the proposed work the semi-circular monopole patch antenna is excited with micro strip line feeding. To get required notching bands concentric rings are placed on the patch. The antenna design is simulated using CST microwave studio. Some of the important antenna parameters like Return losses, VSWR, Radiation pattern are measured.

Multi-Band Notched Antennas for UWB Applications

Radioelectronics and Communications Systems, 2019

A compact ultra-wideband circular monopole antennas with single, dual, triple and quad-band rejec... more A compact ultra-wideband circular monopole antennas with single, dual, triple and quad-band rejection characteristics are proposed in this paper. The antenna units are designed using RT/DUROID substrate with permittivity 2.2 and all are fed through a coplanar waveguide (CPW). In the proposed antennas splitted concentric rings (SCR) are used to achieve band rejection characteristics. The proposed antennas will reject the existing WLAN (Wireless Local Area Network), WiMAX (World Wide Interoperability for Microwave Access), X-band downlink satellite communication and radio-frequency channel arrangements for fixed wireless systems to avoid interference. Simulations are carried out using CST Wave Studio Suite 2016. Antenna performance parameters like return loss, VSWR, radiation pattern and gain are evaluated for all the antenna units. The antenna units having dimensions of 30´23´1.57 mm 3 are fabricated and tested. The simulated and tested results are compared and reported. These antenna units provide good gain and a larger bandwidth over the frequency range 3-11.6 GHz.

A Novel Dual - Band Notched Hexagonal Monopole Antenna for UWB Applications

International journal of simulation: systems, science & technology, 2019

We propose a compact ultra-wideband (UWB) hexagonal monopole antenna with dual band-notched chara... more We propose a compact ultra-wideband (UWB) hexagonal monopole antenna with dual band-notched characteristics. The design consists of a hexagonal radiating patch and a partial ground plane. In 2002 Federal communication commission assigned a frequency band of 3.1GHz-10.6 GHz for commercial applications. Our hexagonal radiating patch has dimensions 32x22x1.57 mm 3 and is printed on the RT/Duroid substrate with dielectric constant 2.2. Defected ground structure is used to achieve UWB characteristics. There are existing wireless technologies that use certain bands for their operation which lie within the Ultra-wide band. To achieve high data rates of transmission and to avoid interference between the existing bands, band notching characteristics are proposed. In order to achieve dual band notching inverted U-shaped slots are embedded on the patch to reject WiMAX band from (3.3-3.8) GHz and WLAN band (5.3-5.6GHZ). The dimensions of the slots are optimized and the antenna units are simulated using High Frequency Structure Simulator (HFSS). The antenna performance parameters such as Return loss, Gain, Directivity, Radiation pattern and VSWR are measured. The simulated antenna is fabricated and tested. The results are compared and reported.

Compact Penta Band Notched Antenna Using Concentric Rings with Splitter Bricks for Ultra Wide Band Applications

Journal of Communications Technology and Electronics, 2018

In this paper novel miniature ultra wide band circular mono pole antenna with penta band rejectio... more In this paper novel miniature ultra wide band circular mono pole antenna with penta band rejection characteristics is proposed. The antenna is fed through a Coplanar Waveguide (CPW) feed. The antenna is designed using RT/ DUROID substrate with permittivity 2.2. In the proposed antenna Concentric Rings with Splitter Bricks (CRSB) are used to achieve band notching characteristics. It will reject the existing WIMAX (Worldwide Interoperability for Microwave Access) from 3.326-3.612 GHz, C band down link frequency from 3.8-4.2 GHz, WLAN application from 5.393-5.822 GHz, X Band downlink Satellite communication application from 7.25-7.733 GHz and ITU band operations from 8.0-8.565 GHz. The Simulations of this antenna are carried out using CST microwave studio suite 2016. Antenna performance parameters like Return loss, Voltage standing wave ratio (VSWR), Radiation efficiency and Gain are evaluated. Radiation pattern of the antenna at different frequencies are observed. This antenna provides good gain and a larger band width over the frequency range 3.1-11.6 GHz.

Compact Hexagonal Monopole Antenna

Indian Journal of Science and Technology, 2017

Objective: The different configurations of hexagonal monopole antennas are designed, simulated, t... more Objective: The different configurations of hexagonal monopole antennas are designed, simulated, tested and their performance is compared. Method: Different Hexagonal monopole antennas are designed and simulated using HFSS, these antennas are designed using Defective Ground Structure (DGS) and slots are made in ground plane and on patch. Effect of slot position on performance of antenna is examined. The antenna units are studied through simulation two antennas were fabricated and its return loss and VSWR are measured. Findings: The antenna parameters like return losses, VSWR, Gain and Directivity are evaluated and return losses and VSWR for the fabricated antennas are measured. It is observed that over a wide frequency band the return losses are less than-10dB and VSWR is less than 2. Applications: These antennas can be used over UWB for Wireless and Indoor applications.

A Novel Scheme of Load Forecasting pertaining to long term Planning of a distribution system

TENCON 2005 - 2005 IEEE Region 10 Conference, 2005

ABSTRACT

Performance Study of Power Control Radio Resource Management Over WLANs

Journal of Computer Science, 2008

Wireless Local Area Networks (WLANs) based on IEEE 802.11 standard have been rapidly growing. Wit... more Wireless Local Area Networks (WLANs) based on IEEE 802.11 standard have been rapidly growing. With limitations of the WLAN standard and rapid increase in wireless application demand, the air interface acts as bottleneck even in high-speed WLAN standards such as IEEE 802.11a and 802.11g with expected data transmission rates of up to 54 Mbps. To improve the overall performance of IEEE 802.11 WLAN under large deployment and heavy application demand environment, Radio Resource Management (RRM) algorithms based on power control have been investigated and tested through simulation. The results show that controlling the Wireless Terminal's (WT) transmitter power to an optimum power level helps in increasing data throughput in WLANs and when the transmitter power level of a WT is increased beyond the optimum power level, the overall data throughputs drop drastically no matter how high the WT's transmitter power may be increased.

WLAN-GPRS Tight Coupling Based Interworking Architecture with Vertical Handoff Support

Wireless Personal Communications, 2006

There have been parallel technological developments in wireless local network (WLAN) and cellular... more There have been parallel technological developments in wireless local network (WLAN) and cellular wide area network (WAN) technologies. This is evidenced by the boom in fast WLANs enabled devices, the spread of 2.5 G networks and the increasing emergence 3 G communication networks, applications and terminals. The prospects of integrating WLAN and cellular WAN technologies with support for seamless handoffs between the two heterogeneous have changed the mentality of researchers from considering WLAN technology as a threat to the future of wide area cellular networks to accepting the technology as a complementary solution. A number of architectures for interworking the two different network types have been proposed mainly based on the loose coupling interworking approach recommended by the ETSI. One of the main weaknesses anticipated with loose coupling architecture is excessive handoff latency, which may lead to data loss, traffic congestion and handoff failure. In this paper an architecture for interworking WLAN and the GPRS networks, based on the ETSI tight coupling approach, is proposed.

Performance Analysis of Downward Handoff Latency in a WLAN/GPRS Interworking System

Journal of Computer Science, 2005

This study presents the performance analysis of a new tight coupling based WLAN/GPRS interworking... more This study presents the performance analysis of a new tight coupling based WLAN/GPRS interworking architecture. The effects of network traffic on downward handoff latency are investigated. The results indicate that increasing WLAN traffic increases the overall downward handoff latency more than increasing GPRS traffic. On the other hand, increasing GPRS traffic results in higher packet buffering requirements at the Serving GPRS Support Node (SGSN).

A scheme for efficient topology management of wireless ad hoc networks using the MARI algorithm

2008 16th IEEE International Conference on Networks, 2008

Wireless ad hoc networks consist of nodes which can communicate with each other in a peer-to-peer... more Wireless ad hoc networks consist of nodes which can communicate with each other in a peer-to-peer fashion over single hop or multi hops without any fixed infrastructure such as access point or base station. In flat topology there is no topology management concept and all the nodes participate in routing. In this paper the task of topology management for ad hoc networks is implemented using Routing Intelligence Mobile Agent (MARI) Algorithm and the performance is compared with that of flat topology network having same number nodes. In the proposed scheme the nodes with higher power levels among their one hop neighbors are selected as MARI nodes and these participate in routing. To provide communication between any two MARI nodes a midway node is selected. Only these MARI and midway nodes will stay awake and the remaining nodes will be in sleep mode so that there is power saving. In this paper, the power consumption and back off delay performance of a flat network and a network employing MARI algorithm are compared. The proposed MARI topology management is found to have less power consumption and less back-off delay as compared with flat topology.

Improved Performance of Traffic Dependent Outage Rate Cellular System

Journal of Computer Science, 2005

The designers of a mobile cellular system must evaluate the possible configurations of the system... more The designers of a mobile cellular system must evaluate the possible configurations of the system components and their characteristics in order to develop a system with greater efficiency. The useful parameters to estimate performances of the system are voice quality, frequency spectrum efficiency and grade of service (GOS). In this study, a scheme proposed to reduce the lost calls and interruptions due to the outage channels is tested in the traffic dependent outage rate wireless cellular system. In this scheme no call is dropped but could be delayed. The performance parameters considered for this study is the probability of delay and the mean waiting time for priority and nonpriority calls for non-preemptive type. The system is evaluated for different conditions and the results are discussed.

A new technique for street noise reduction in signal processing applications

TENCON 2008 - 2008 IEEE Region 10 Conference, 2008

... [11] K. Anitha Sheela, ch.V.Rama Rao, K.Satya Prasad and AVNTilak,A noise reduction Preproce... more

WPAN scheme for Bluetooth devices: a review

The use of Bluetooth (BT) devices is on increase. The conventional LAN techniques for networking ... more The use of Bluetooth (BT) devices is on increase. The conventional LAN techniques for networking do not suit the BT environment. We discuss the suitability of the wireless personal area network (WPAN) for BT devices. At the present time, users are surrounded by numerous portable devices, such as personal digital assistants (PDA), personal computers, digital camera, CD/VCD/MP3/DVD player, mobile phone, pager and microwave oven, in the home or office environment. The personal area network (PAN) is a network which connects these devices one to another without the need of cable. Information, which consists of data as well as voice, may flow seamlessly between these Bluetooth devices. A number of technologies exist to support these kind of wireless services in PAN, like Home RF, Infrared IrDa and Bluetooth. Due to its inherent merits, Bluetooth superseded its parallel counterparts. Bluetooth and WPAN technologies are reviewed as the basis for a proposal to develop a mathematical model fo...