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Papers by umamaheshwar soma

Research paper thumbnail of Channel Estimation in Broadband MIMO Systems

Research paper thumbnail of Enhancing AlGaN/GaN HEMT Performance through Gate-All-Around AlN Passivation: A Comparative Study with a Planar MIS-HEMT

Journal of electronic materials, Feb 21, 2024

Research paper thumbnail of Enhancing Performance of Dual-Gate FinFET with High-K Gate Dielectric Materials in 5 nm Technology: A Simulation Study

Transactions on Electrical and Electronic Materials

Research paper thumbnail of Novel Hybrid MIMO Detector for Spatial Multiplexed MIMO System

IOP Conference Series: Materials Science and Engineering, 2020

The need of data transmission has recently increased dramatically and the promising MIMO technolo... more The need of data transmission has recently increased dramatically and the promising MIMO technology has been employed to preserve reliability. It can achieve exceptionally enhanced spectral proficiencies by adopting several antennas both at the source and the receiver. However, complexity of several detection schemes escalates because of tremendous increasing of customers and antennas. This paper proposes novel hybrid MIMO detection (NHMD) method to compromise the complexity and the hardware design challenges. The key objective is to develop a less-complex hybrid detection system to enhance hardware execution suitability without negotiating the performance of the bit error rate. The proposed NHMD method combines conventional linear detectors such as zero-force (ZF) and minimum mean square error (MMSE) with the K-best detector for quality enhancement. It introduces an optimal differential evolution (ODE) algorithm that selects detector using multiple constraints. Moreover, this metho...

Research paper thumbnail of Performance evaluation of multiuser MIMO detection techniques

This paper we evaluates the performance of multiuser multiple input and multiple outputs (MU-MIMO... more This paper we evaluates the performance of multiuser multiple input and multiple outputs (MU-MIMO) detection schemes. MIMO transmissions schemes include transmit diversity and spatial multiplexing and MIMO detection schemes such as zero forcing and soft spheres decoding (SSD). The performance metrics considered are throughput and bit error rate (BER) and these are used to evaluate the performance of LTE in flat fading and International Telecommunications Union B (ITU-B) Pedestrian channel with zero forcing and soft sphere decoding for Single Input Single Output (SISO), transmit diversity and spatial multiplexing. The simulations show that the performance of MIMO is better than SISO in both channel models particularly when SSD is employed. When high order modulation is utilized, performance in the flat-fading channel model is better than ITU pedestrian B channel at low SNR regions.

Research paper thumbnail of Device Design and Modeling of Fin Field Effect Transistor for Low Power Applications

Research paper thumbnail of Cloud-Based E-learning: Scaffolding the Environment for Adaptive E-learning Ecosystem Based on Cloud Computing Infrastructure

Lecture Notes in Networks and Systems

Research paper thumbnail of Investigating the Effects of Channel Length and High-K Dielectric Materials on the Performance of Double-Gate MOSFETs

Transactions on Electrical and Electronic Materials

Research paper thumbnail of PAPR reduction based on subcarriers in FBMC based system

INTERNATIONAL CONFERENCE ON RESEARCH IN SCIENCES, ENGINEERING & TECHNOLOGY

Research paper thumbnail of Transmit Antenna Optimization, Power and Energy Efficient Algorithm in Massive MIMO Technology

2021 3rd International Conference on Advances in Computing, Communication Control and Networking (ICAC3N), 2021

In today’s Wireless Communication World MMIMO (Massive Multiple Input and Multiple Output) is the... more In today’s Wireless Communication World MMIMO (Massive Multiple Input and Multiple Output) is the sounding word and capable system for high data transmission rates in Wireless Systems and Networks (WSN). Higher Data Transmission Rates are achieved by posing many more antennas at base station, as result the power consumption should be more, and the bandwidth requirement also enhanced. To address this issue, in this article an innovative method of selecting the Transmit Antenna by making active and passive combination a novel method is proposed. This novel method not only optimizes the antenna selection but also provides the mechanism of reducing power utilization and energy consumption. Initially we consider the GSA (Gravitational Search Algorithm) with velocity parameter and proposed an alternative velocity, treated as Enhanced Velocity Gravitational Search Algorithm (EV-GAS). Moreover EV-GASA on conventional models of Greedy Algorithm, Antenna Bee Colony, Particle Swarm Optimization, Fierce fly for antenna optimization, Energy and Power consumption. Obtained outcomes are proved the EV-GAS is the prominent algorithm for high data transmission rates.

Research paper thumbnail of An Efficient Design of QCA Binary to Gray Code Converter for Telecommunication Systems

Quantum Dot Cellular Automata (QCA) is a prominent technology in Quantum Electronics. This is imp... more Quantum Dot Cellular Automata (QCA) is a prominent technology in Quantum Electronics. This is implemented with the help of quantum cells which are also known as basic building blocks of Quantum Electronics. In QCA technology there are four different clock pulses, clock delay for each clock cycle is 0.25 ns. Using this technology now we are implementing the Binary to Gray code converter. In this paper, we are proposing a design to reduce the number of cells when compared to the previous designs and we are also extending the implementation of the converter up to 5-bits. The number of cells in the proposed design is improved by 2.5%, 36.44%, and 50.66% for 2-bit, 3-bit, and 4-bit respectively. Also, for 3-bit and 4-bit, the total occupied area is improved by 55.56% and 74.680% respectively. In our proposed design it helps us to decrease the area from the previous circuit, which may also lead to the decrease in the power consumption.

Research paper thumbnail of Compression of Gain in n-Channel MESFET for MIMO Applications

Silicon, 2022

A new n-channel recessed Metal semiconductor field effect transistor (MESFET) with different mate... more A new n-channel recessed Metal semiconductor field effect transistor (MESFET) with different materials is designed for high power applications in Multi Input Multi Output (MIMO) systems in this paper. Based on material properties and electrical characteristics of MESFET, a SPICE model of the proposed device is developed. For high performance power switches, the power MESFETs are used in most of the applications. The employability of the technology is validated by the electrical measurements of the device. The operational mechanism has been shown by the characterizations done on the proposed device. To optimize the electrical performance, the contact resistance technique has to be enhanced. In this work, the output power and Gain compression of proposed n-channel MESFET at 100 MHz and 1 GHz for high input power is obtained. The output power at fundamental frequency of operation for high input power is also obtained.

Research paper thumbnail of A Dual Gate Junctionless FinFET for Biosensing Applications

Silicon, 2022

Analytical model of dielectric modulated trench dual gate junction less field effect transistor (... more Analytical model of dielectric modulated trench dual gate junction less field effect transistor (DM_TDJLFET) for biosensing applications is used for the label free detection of bio molecules. The structure of DM-TDGJLFET has two gates which are placed vertical in separated trenches. Threshold voltage sensitivity of neutral as well as charged biomolecules are being studied by this model. Analytical modeling of dual gate and nanowire junction less is used for theoretical analysis off junction less ion sensitive field effect transistor. This FET is used to get the output of nanowire and planar dual gate JLISFET with respect to pH for all regions of operations. This topology successfully brings about designated retention time with larger physical barrier thickness and wider barrier offset length caused by the reduction in band to band tunneling and recombination performance of GaAs and GaSb dual gate junction less metal oxide semiconductor FET is used for the study of high performance switching applications GaAs gallium arsenide is a III-V direct bandgap semiconductor with a zinc blende crystal structure devices. It results a higher leakage power description in both channel materials and low intrinsic delay for thicker layers caused by a substitution amount of energy drop for the predictive analytic model of negative capacitance affect in long channel dual gate junction less transistor. It is based on charge model. The negative capacitance minimizes short channel effects and improves current driving capability, enables both low power operation and more effective transistor size scaling. The sensitivity analysis of negative capacitance junction less transistor is developed in the view of variation in device parameters and the performance with conventional JL devices with TCAD-based investigation of dual gate junction less transistor is used for visualizing the sensitivity of the device against light intensity.

Research paper thumbnail of Improved performance of low complexity K-best sphere decoder algorithm

2017 International Conference on Inventive Communication and Computational Technologies (ICICCT), 2017

To achieve high data rates, reliable data rate transmission and near capacity performance for fut... more To achieve high data rates, reliable data rate transmission and near capacity performance for future wireless communication systems iterative processing has been widely considered. However, such an efficient receiver design has been made significant challenge. In this paper, multiple-input multiple output (MIMO) detection with channel decoding techniques has been investigated for achieve reliable data transmission, the performance and computation complexity of the receiver for MIMO system has been considered. First we studied and review the most MIMO detection algorithms based on the sphere decoding (SD), K-best decoding and interference cancellation. In consequence a low complexity K-best (LC-K-Best) based sphere decoder is proposed in order to substantially reduce the computation complexity without significant performance degradation.

Research paper thumbnail of K-Best Sphere Decoder Algorithm for Spatial Multiplexing Mimo Systems

To achieve high data rates, reliable data rate transmission and near capacity performance of next... more To achieve high data rates, reliable data rate transmission and near capacity performance of next generation wireless communication systems iterative processing has been widely considered. However, such an efficient receiver design has been made significant challenge. In this paper, MIMO detection techniques have been investigated which achieves reliable data transmission with less computation complexity. We studied and review the MIMO receiver algorithms such as Sphere decoding (SD), K-best decoding and interference cancellation. In order to reduce computational complexity without significant performance degradation low complexity K-best (LC-K best) base d SD is evaluated.

Research paper thumbnail of Gain Compression of n-MESFET for High Power Applications in MIMO

In this paper, a new n-type recessed Metal semiconductor field effect transistor (MESFET) with Ga... more In this paper, a new n-type recessed Metal semiconductor field effect transistor (MESFET) with GaAs/ SiC materials is designed for high power applications in Multi Input Multi Output (MIMO) systems. Based on electrical characteristics of MESFET, a SPICE model of the proposed device is developed. For power switches, the power MESFETs are used. The feasibility of the technology is validated by the electrical measurements of the device. The operational technology has been shown by the characterizations done on the proposed device. To optimize the electrical performance, the contact resistance technique has to be enhanced. In this work, the output power and Gain compression of proposed n-channel MESFET at 100 MHz and 1 GHz for high input power is obtained. The output power at fundamental frequency of operation for high input power is also obtained.

Research paper thumbnail of Robust Multiuser Detection in Asynchronous DS-CDMA Systems over Nakagami-m Fading Channels

2014 5th International Conference on Intelligent Systems, Modelling and Simulation, 2014

Research paper thumbnail of Channel Estimation in Broadband MIMO Systems

Research paper thumbnail of Enhancing AlGaN/GaN HEMT Performance through Gate-All-Around AlN Passivation: A Comparative Study with a Planar MIS-HEMT

Journal of electronic materials, Feb 21, 2024

Research paper thumbnail of Enhancing Performance of Dual-Gate FinFET with High-K Gate Dielectric Materials in 5 nm Technology: A Simulation Study

Transactions on Electrical and Electronic Materials

Research paper thumbnail of Novel Hybrid MIMO Detector for Spatial Multiplexed MIMO System

IOP Conference Series: Materials Science and Engineering, 2020

The need of data transmission has recently increased dramatically and the promising MIMO technolo... more The need of data transmission has recently increased dramatically and the promising MIMO technology has been employed to preserve reliability. It can achieve exceptionally enhanced spectral proficiencies by adopting several antennas both at the source and the receiver. However, complexity of several detection schemes escalates because of tremendous increasing of customers and antennas. This paper proposes novel hybrid MIMO detection (NHMD) method to compromise the complexity and the hardware design challenges. The key objective is to develop a less-complex hybrid detection system to enhance hardware execution suitability without negotiating the performance of the bit error rate. The proposed NHMD method combines conventional linear detectors such as zero-force (ZF) and minimum mean square error (MMSE) with the K-best detector for quality enhancement. It introduces an optimal differential evolution (ODE) algorithm that selects detector using multiple constraints. Moreover, this metho...

Research paper thumbnail of Performance evaluation of multiuser MIMO detection techniques

This paper we evaluates the performance of multiuser multiple input and multiple outputs (MU-MIMO... more This paper we evaluates the performance of multiuser multiple input and multiple outputs (MU-MIMO) detection schemes. MIMO transmissions schemes include transmit diversity and spatial multiplexing and MIMO detection schemes such as zero forcing and soft spheres decoding (SSD). The performance metrics considered are throughput and bit error rate (BER) and these are used to evaluate the performance of LTE in flat fading and International Telecommunications Union B (ITU-B) Pedestrian channel with zero forcing and soft sphere decoding for Single Input Single Output (SISO), transmit diversity and spatial multiplexing. The simulations show that the performance of MIMO is better than SISO in both channel models particularly when SSD is employed. When high order modulation is utilized, performance in the flat-fading channel model is better than ITU pedestrian B channel at low SNR regions.

Research paper thumbnail of Device Design and Modeling of Fin Field Effect Transistor for Low Power Applications

Research paper thumbnail of Cloud-Based E-learning: Scaffolding the Environment for Adaptive E-learning Ecosystem Based on Cloud Computing Infrastructure

Lecture Notes in Networks and Systems

Research paper thumbnail of Investigating the Effects of Channel Length and High-K Dielectric Materials on the Performance of Double-Gate MOSFETs

Transactions on Electrical and Electronic Materials

Research paper thumbnail of PAPR reduction based on subcarriers in FBMC based system

INTERNATIONAL CONFERENCE ON RESEARCH IN SCIENCES, ENGINEERING & TECHNOLOGY

Research paper thumbnail of Transmit Antenna Optimization, Power and Energy Efficient Algorithm in Massive MIMO Technology

2021 3rd International Conference on Advances in Computing, Communication Control and Networking (ICAC3N), 2021

In today’s Wireless Communication World MMIMO (Massive Multiple Input and Multiple Output) is the... more In today’s Wireless Communication World MMIMO (Massive Multiple Input and Multiple Output) is the sounding word and capable system for high data transmission rates in Wireless Systems and Networks (WSN). Higher Data Transmission Rates are achieved by posing many more antennas at base station, as result the power consumption should be more, and the bandwidth requirement also enhanced. To address this issue, in this article an innovative method of selecting the Transmit Antenna by making active and passive combination a novel method is proposed. This novel method not only optimizes the antenna selection but also provides the mechanism of reducing power utilization and energy consumption. Initially we consider the GSA (Gravitational Search Algorithm) with velocity parameter and proposed an alternative velocity, treated as Enhanced Velocity Gravitational Search Algorithm (EV-GAS). Moreover EV-GASA on conventional models of Greedy Algorithm, Antenna Bee Colony, Particle Swarm Optimization, Fierce fly for antenna optimization, Energy and Power consumption. Obtained outcomes are proved the EV-GAS is the prominent algorithm for high data transmission rates.

Research paper thumbnail of An Efficient Design of QCA Binary to Gray Code Converter for Telecommunication Systems

Quantum Dot Cellular Automata (QCA) is a prominent technology in Quantum Electronics. This is imp... more Quantum Dot Cellular Automata (QCA) is a prominent technology in Quantum Electronics. This is implemented with the help of quantum cells which are also known as basic building blocks of Quantum Electronics. In QCA technology there are four different clock pulses, clock delay for each clock cycle is 0.25 ns. Using this technology now we are implementing the Binary to Gray code converter. In this paper, we are proposing a design to reduce the number of cells when compared to the previous designs and we are also extending the implementation of the converter up to 5-bits. The number of cells in the proposed design is improved by 2.5%, 36.44%, and 50.66% for 2-bit, 3-bit, and 4-bit respectively. Also, for 3-bit and 4-bit, the total occupied area is improved by 55.56% and 74.680% respectively. In our proposed design it helps us to decrease the area from the previous circuit, which may also lead to the decrease in the power consumption.

Research paper thumbnail of Compression of Gain in n-Channel MESFET for MIMO Applications

Silicon, 2022

A new n-channel recessed Metal semiconductor field effect transistor (MESFET) with different mate... more A new n-channel recessed Metal semiconductor field effect transistor (MESFET) with different materials is designed for high power applications in Multi Input Multi Output (MIMO) systems in this paper. Based on material properties and electrical characteristics of MESFET, a SPICE model of the proposed device is developed. For high performance power switches, the power MESFETs are used in most of the applications. The employability of the technology is validated by the electrical measurements of the device. The operational mechanism has been shown by the characterizations done on the proposed device. To optimize the electrical performance, the contact resistance technique has to be enhanced. In this work, the output power and Gain compression of proposed n-channel MESFET at 100 MHz and 1 GHz for high input power is obtained. The output power at fundamental frequency of operation for high input power is also obtained.

Research paper thumbnail of A Dual Gate Junctionless FinFET for Biosensing Applications

Silicon, 2022

Analytical model of dielectric modulated trench dual gate junction less field effect transistor (... more Analytical model of dielectric modulated trench dual gate junction less field effect transistor (DM_TDJLFET) for biosensing applications is used for the label free detection of bio molecules. The structure of DM-TDGJLFET has two gates which are placed vertical in separated trenches. Threshold voltage sensitivity of neutral as well as charged biomolecules are being studied by this model. Analytical modeling of dual gate and nanowire junction less is used for theoretical analysis off junction less ion sensitive field effect transistor. This FET is used to get the output of nanowire and planar dual gate JLISFET with respect to pH for all regions of operations. This topology successfully brings about designated retention time with larger physical barrier thickness and wider barrier offset length caused by the reduction in band to band tunneling and recombination performance of GaAs and GaSb dual gate junction less metal oxide semiconductor FET is used for the study of high performance switching applications GaAs gallium arsenide is a III-V direct bandgap semiconductor with a zinc blende crystal structure devices. It results a higher leakage power description in both channel materials and low intrinsic delay for thicker layers caused by a substitution amount of energy drop for the predictive analytic model of negative capacitance affect in long channel dual gate junction less transistor. It is based on charge model. The negative capacitance minimizes short channel effects and improves current driving capability, enables both low power operation and more effective transistor size scaling. The sensitivity analysis of negative capacitance junction less transistor is developed in the view of variation in device parameters and the performance with conventional JL devices with TCAD-based investigation of dual gate junction less transistor is used for visualizing the sensitivity of the device against light intensity.

Research paper thumbnail of Improved performance of low complexity K-best sphere decoder algorithm

2017 International Conference on Inventive Communication and Computational Technologies (ICICCT), 2017

To achieve high data rates, reliable data rate transmission and near capacity performance for fut... more To achieve high data rates, reliable data rate transmission and near capacity performance for future wireless communication systems iterative processing has been widely considered. However, such an efficient receiver design has been made significant challenge. In this paper, multiple-input multiple output (MIMO) detection with channel decoding techniques has been investigated for achieve reliable data transmission, the performance and computation complexity of the receiver for MIMO system has been considered. First we studied and review the most MIMO detection algorithms based on the sphere decoding (SD), K-best decoding and interference cancellation. In consequence a low complexity K-best (LC-K-Best) based sphere decoder is proposed in order to substantially reduce the computation complexity without significant performance degradation.

Research paper thumbnail of K-Best Sphere Decoder Algorithm for Spatial Multiplexing Mimo Systems

To achieve high data rates, reliable data rate transmission and near capacity performance of next... more To achieve high data rates, reliable data rate transmission and near capacity performance of next generation wireless communication systems iterative processing has been widely considered. However, such an efficient receiver design has been made significant challenge. In this paper, MIMO detection techniques have been investigated which achieves reliable data transmission with less computation complexity. We studied and review the MIMO receiver algorithms such as Sphere decoding (SD), K-best decoding and interference cancellation. In order to reduce computational complexity without significant performance degradation low complexity K-best (LC-K best) base d SD is evaluated.

Research paper thumbnail of Gain Compression of n-MESFET for High Power Applications in MIMO

In this paper, a new n-type recessed Metal semiconductor field effect transistor (MESFET) with Ga... more In this paper, a new n-type recessed Metal semiconductor field effect transistor (MESFET) with GaAs/ SiC materials is designed for high power applications in Multi Input Multi Output (MIMO) systems. Based on electrical characteristics of MESFET, a SPICE model of the proposed device is developed. For power switches, the power MESFETs are used. The feasibility of the technology is validated by the electrical measurements of the device. The operational technology has been shown by the characterizations done on the proposed device. To optimize the electrical performance, the contact resistance technique has to be enhanced. In this work, the output power and Gain compression of proposed n-channel MESFET at 100 MHz and 1 GHz for high input power is obtained. The output power at fundamental frequency of operation for high input power is also obtained.

Research paper thumbnail of Robust Multiuser Detection in Asynchronous DS-CDMA Systems over Nakagami-m Fading Channels

2014 5th International Conference on Intelligent Systems, Modelling and Simulation, 2014