Rakesh Peter - Academia.edu (original) (raw)

Papers by Rakesh Peter

In this paper, the design and evaluation of a low noise amplifier, that operates in the L-band, i... more In this paper, the design and evaluation of a low noise amplifier, that operates in the L-band, is being discussed. The amplifier was fabricated on FR-4 substrate. ATF-58143 Low Noise Enhancement Mode Pseudomorphic High Electron Mobility Transistor [HEMT] is used. The designed LNA is found to have a gain of 13 dB. The return loss is below -10 dB.

Procedia Technology, 2012

In this paper, we share our experience of designing a Trapezoidal Monopole Antenna with truncated... more In this paper, we share our experience of designing a Trapezoidal Monopole Antenna with truncated ground plane for 2.5 GHz Band. Trapezoidal monopole antenna has an omnidirectional radiation pattern. Point-to Multi-Point WiFi system requires an omnidirectional common main antenna to distribute signal to wireless devices and computers. The proposed antenna uses a relatively cheap substrate FR-4 with permittivity ε r = 4.4 and loss tangent tanδ = 0.02. The size of the antenna is 12 × 12cm 2. The ground plate is defected to achieve good impedance matching over the desired frequency band. A 50 Ohm microstrip transmission line acts as the feed for the proposed antenna. The antenna has a Voltage Standing Wave Ratio (VSWR) less than 2 in the frequency band 2.4 GHz to 2.75 GHz. The fractional bandwidth is about 13.5% with respect to the center frequency 2.52 GHz. The design and simulation results are presented in this paper. c

International journal of electronic signal and systems, Jul 1, 2012

In this paper, we share our experience of designing a circularly polarized square patch antenna a... more In this paper, we share our experience of designing a circularly polarized square patch antenna at L band. The antenna is designed using a relatively cheap substrate FR-4 with permittivity  r = 4:4 and loss tangent tan = 0:02. The antenna has a gain of 5dB. Simulated response shows that the designed antenna has an input impedance(Z in) of 50 approximately. An efficiency of 65% is obtained for a single patch. It has a narrow bandwidth and a high Q factor. The design procedure, feed mechanism and simulation results are presented in this paper.

We initially discuss a new and simple method of parameterization of compactly supported biorthogo... more We initially discuss a new and simple method of parameterization of compactly supported biorthogonal wavelet systems with more than one vanishing moment. To this end we express both primal and dual scaling function filters (low pass) as products of two Laurent polynomials. The first factor ensures required vanishing moments and the second factor is parameterized and adjusted to provide required length and other low pass filter requirements. We then impose double shift orthogonality conditions on the resulting two sets of filter coefficients that make them 'Perfect Reconstruction' filters. This modification avoids the use of Diophantine equations and associated spectral factorization method(1,2,3,4) for its derivation. The method is then modified for the parametric and non-parametric orthogonal cases, which includes the derivation for Daubechies filters.

Procedia Engineering, 2012

The lack of spectrum for communication and for research is a bottleneck as far as technology and ... more The lack of spectrum for communication and for research is a bottleneck as far as technology and business development is considered. It is a fact that the availability of useful spectrum is limited by hardware constraints. The studies conducted by the Federal Communications Commission found that that there are many areas of the radio spectrum which are not fully utilized in different geographical areas of the country and FCC recommended locating and utilizing these unused spectrum spaces by other users. This is where spectrum sensing comes into use. From then on different spectrum sensing algorithms were developed. The paper implements four of those major sensing spectrum algorithms in MATLAB-Simulink and also does a performance comparison among them.

International Journal of Electronics Signals and Systems, 2012

In this paper, we share our experience of designing a circularly polarized square patch antenna a... more In this paper, we share our experience of designing a circularly polarized square patch antenna at L band. The antenna is designed using a relatively cheap substrate FR-4 with permittivity  r = 4:4 and loss tangent tan = 0:02. The antenna has a gain of 5dB. Simulated response shows that the designed antenna has an input impedance(Z in) of 50 approximately. An efficiency of 65% is obtained for a single patch. It has a narrow bandwidth and a high Q factor. The design procedure, feed mechanism and simulation results are presented in this paper.

International Journal of Information and Electronics Engineering, 2012

Design and optimization of a parallel-coupled microstrip bandpass filter for Software Defined Tel... more Design and optimization of a parallel-coupled microstrip bandpass filter for Software Defined Telescope is presented in this paper. The simulation and optimization is done using ADS and Momentum. The filter is designed and optimized at a center frequency of 1.42GHz. The filter is built on a relatively cheap substrate FR-4 with permittivity 4.4 r   and loss tangent tan 0.02  . Simulation results reveal that the filter operation is optimum over the frequency range 1.41 GHz to 1.44 GHz. The 3 dB bandwidth is thus 300 MHz. the return loss is below-10 dB over the passband. Insertion loss is-2.806 dB in the passband. The filter is almost matched to the characteristic impedance (0 Z), 50 Ohms. Also it is observed that the phase varies linearly with frequency. The filter once fabricated could be used at the radio receiver of the Software Radio Telescope to filter out terrestrial radio interference.

We initially discuss a new and simple method of parameterization of compactly supported biorthogo... more We initially discuss a new and simple method of parameterization of compactly supported biorthogonal wavelet systems with more than one vanishing moment. To this end we express both primal and dual scaling function filters (low pass) as products of two Laurent polynomials. The first factor ensures required vanishing moments and the second factor is parameterized and adjusted to provide required length and other low pass filter requirements. We then impose double shift orthogonality conditions on the resulting two sets of filter coefficients that make them 'Perfect Reconstruction' filters. This modification avoids the use of Diophantine equations and associated spectral factorization method(1,2,3,4) for its derivation. The method is then modified for the parametric and non-parametric orthogonal cases, which includes the derivation for Daubechies filters.

2014 First International Conference on Computational Systems and Communications (ICCSC), 2014

In this paper, the design and evaluation of a low noise amplifier, that operates in the L-band, i... more In this paper, the design and evaluation of a low noise amplifier, that operates in the L-band, is being discussed. The amplifier was fabricated on FR-4 substrate. ATF-58143 Low Noise Enhancement Mode Pseudomorphic High Electron Mobility Transistor [HEMT] is used. The designed LNA is found to have a gain of 13 dB. The return loss is below -10 dB.

Procedia Technology, 2012

In this paper, we share our experience of designing a Trapezoidal Monopole Antenna with truncated... more In this paper, we share our experience of designing a Trapezoidal Monopole Antenna with truncated ground plane for 2.5 GHz Band. Trapezoidal monopole antenna has an omnidirectional radiation pattern. Point-to Multi-Point WiFi system requires an omnidirectional common main antenna to distribute signal to wireless devices and computers. The proposed antenna uses a relatively cheap substrate FR-4 with permittivity ε r = 4.4 and loss tangent tanδ = 0.02. The size of the antenna is 12 × 12cm 2. The ground plate is defected to achieve good impedance matching over the desired frequency band. A 50 Ohm microstrip transmission line acts as the feed for the proposed antenna. The antenna has a Voltage Standing Wave Ratio (VSWR) less than 2 in the frequency band 2.4 GHz to 2.75 GHz. The fractional bandwidth is about 13.5% with respect to the center frequency 2.52 GHz. The design and simulation results are presented in this paper. c

Procedia Engineering, 2012

The lack of spectrum for communication and for research is a bottleneck as far as technology and ... more The lack of spectrum for communication and for research is a bottleneck as far as technology and business development is considered. It is a fact that the availability of useful spectrum is limited by hardware constraints. The studies conducted by the Federal Communications Commission found that that there are many areas of the radio spectrum which are not fully utilized in different geographical areas of the country and FCC recommended locating and utilizing these unused spectrum spaces by other users. This is where spectrum sensing comes into use. From then on different spectrum sensing algorithms were developed. The paper implements four of those major sensing spectrum algorithms in MATLAB-Simulink and also does a performance comparison among them.

2012 International Conference on Advances in Computing and Communications, 2012

This paper is an attempt to reveal the untapped immense power of the GNU Radio - an open source s... more This paper is an attempt to reveal the untapped immense power of the GNU Radio - an open source software, in control and monitoring systems, both real time applications and class-room demonstrations. GNU Radio has already gained wide acceptance and glory in communication and signal processing. As a novel attempt to bring the controlling capability of GNU Radio to limelight, an experiment for temperature control, out of its innumerable applications, and the possibility of a revolution by this free open source software is predicted and explained through this paper. This paper describes the hardware and software requirements for the temperature control experiment with SBHS (Single Board Heater System) using GNU Radio and describes the recommended classroom demonstration.

2013 International Mutli-Conference on Automation, Computing, Communication, Control and Compressed Sensing (iMac4s), 2013

ABSTRACT This paper proposes a low cost, low power, reconfigurable and flexible Open BTS (Base Tr... more ABSTRACT This paper proposes a low cost, low power, reconfigurable and flexible Open BTS (Base Transceiver Station) model based on SDR (Software Defined Radio) using USRP. A microtelecom model serves people at the “bottom of the pyramid” along with ensuring the ROI (Return on Investment) for MNO's (Mobile Network Operators). Thus a new telecom revolution that clubs Microtelecom business model with Open BTS concept would positively affect the socio-economic progress of rural communities, thereby ensuring the overall growth of developing nations. The success of a proposed model of this kind would encourage government to take initiatives and confidently invest on policies that would benefit the low-waged and less-privileged rural communities.

International Journal of Recent Trends in Engineering, 2009

Different mathematical techniques are being developed to reduce the dimensionality of data within... more Different mathematical techniques are being developed to reduce the dimensionality of data within large datasets, for robust retrieval of required information. Latent
Semantic Analysis (LSA), a modified low rank approximation form of Vector Space Model, can be used for detecting underlying semantic relationships within text corpora. LSA performs a low-rank approximation on term-document matrix, which is generated by transforming textual data into a vector representation, thereby bringing out the semantic connectedness present among the documents of the corpus. Singular Value Decomposition (SVD) is the traditional approximation method used for LSA, wherein lower dimensional components from the decomposition are truncated. On truncation, the linguistic noise present in the vector representation is removed, and the semantic connectedness is made visible. One of the pitfalls of using SVD is that the truncated matrix will have negative components, which is not natural for interpreting the textual representation. Nonnegative Matrix Factorization (NMF) addresses this issue by generating non-negative parts-based representation as the low rank approximation for performing LSA. The paper provides an in-depth overview of how both methods are being used for the purpose of Information Retrieval. Performance evaluation of the methods has been performed using standard test datasets.

Large Scale Heterogeneous Wireless Sensor Networks require effective tools for monitoring and man... more Large Scale Heterogeneous Wireless Sensor Networks require effective tools for monitoring and managing the network. In this paper, we discuss about the design and implementation of an application framework in order to monitor and manage a wireless sensor deployment, where the motes exchange IPv6 encapsulated information packets. The application framework is based on a three tier architecture with the nesC/TinyOS based firmware using 'blip' components forming the bottom layer, a middle layer implemented in Python and top layer which is a web interface created using Adobe Flex 4. The implemented features of the application framework include - sensor data acquisition and display, network activity detection of deployed motes, over-the-air programming for software re-visioning, as well as node localization and mapping. The application framework also extends to incorporate the software defined radio based gateway deployed using GNU Radio platform and Universal Software Radio Per...

In this paper, the design and evaluation of a low noise amplifier, that operates in the L-band, i... more In this paper, the design and evaluation of a low noise amplifier, that operates in the L-band, is being discussed. The amplifier was fabricated on FR-4 substrate. ATF-58143 Low Noise Enhancement Mode Pseudomorphic High Electron Mobility Transistor [HEMT] is used. The designed LNA is found to have a gain of 13 dB. The return loss is below -10 dB.

Procedia Technology, 2012

In this paper, we share our experience of designing a Trapezoidal Monopole Antenna with truncated... more In this paper, we share our experience of designing a Trapezoidal Monopole Antenna with truncated ground plane for 2.5 GHz Band. Trapezoidal monopole antenna has an omnidirectional radiation pattern. Point-to Multi-Point WiFi system requires an omnidirectional common main antenna to distribute signal to wireless devices and computers. The proposed antenna uses a relatively cheap substrate FR-4 with permittivity ε r = 4.4 and loss tangent tanδ = 0.02. The size of the antenna is 12 × 12cm 2. The ground plate is defected to achieve good impedance matching over the desired frequency band. A 50 Ohm microstrip transmission line acts as the feed for the proposed antenna. The antenna has a Voltage Standing Wave Ratio (VSWR) less than 2 in the frequency band 2.4 GHz to 2.75 GHz. The fractional bandwidth is about 13.5% with respect to the center frequency 2.52 GHz. The design and simulation results are presented in this paper. c

International journal of electronic signal and systems, Jul 1, 2012

In this paper, we share our experience of designing a circularly polarized square patch antenna a... more In this paper, we share our experience of designing a circularly polarized square patch antenna at L band. The antenna is designed using a relatively cheap substrate FR-4 with permittivity  r = 4:4 and loss tangent tan = 0:02. The antenna has a gain of 5dB. Simulated response shows that the designed antenna has an input impedance(Z in) of 50 approximately. An efficiency of 65% is obtained for a single patch. It has a narrow bandwidth and a high Q factor. The design procedure, feed mechanism and simulation results are presented in this paper.

We initially discuss a new and simple method of parameterization of compactly supported biorthogo... more We initially discuss a new and simple method of parameterization of compactly supported biorthogonal wavelet systems with more than one vanishing moment. To this end we express both primal and dual scaling function filters (low pass) as products of two Laurent polynomials. The first factor ensures required vanishing moments and the second factor is parameterized and adjusted to provide required length and other low pass filter requirements. We then impose double shift orthogonality conditions on the resulting two sets of filter coefficients that make them 'Perfect Reconstruction' filters. This modification avoids the use of Diophantine equations and associated spectral factorization method(1,2,3,4) for its derivation. The method is then modified for the parametric and non-parametric orthogonal cases, which includes the derivation for Daubechies filters.

Procedia Engineering, 2012

The lack of spectrum for communication and for research is a bottleneck as far as technology and ... more The lack of spectrum for communication and for research is a bottleneck as far as technology and business development is considered. It is a fact that the availability of useful spectrum is limited by hardware constraints. The studies conducted by the Federal Communications Commission found that that there are many areas of the radio spectrum which are not fully utilized in different geographical areas of the country and FCC recommended locating and utilizing these unused spectrum spaces by other users. This is where spectrum sensing comes into use. From then on different spectrum sensing algorithms were developed. The paper implements four of those major sensing spectrum algorithms in MATLAB-Simulink and also does a performance comparison among them.

International Journal of Electronics Signals and Systems, 2012

In this paper, we share our experience of designing a circularly polarized square patch antenna a... more In this paper, we share our experience of designing a circularly polarized square patch antenna at L band. The antenna is designed using a relatively cheap substrate FR-4 with permittivity  r = 4:4 and loss tangent tan = 0:02. The antenna has a gain of 5dB. Simulated response shows that the designed antenna has an input impedance(Z in) of 50 approximately. An efficiency of 65% is obtained for a single patch. It has a narrow bandwidth and a high Q factor. The design procedure, feed mechanism and simulation results are presented in this paper.

International Journal of Information and Electronics Engineering, 2012

Design and optimization of a parallel-coupled microstrip bandpass filter for Software Defined Tel... more Design and optimization of a parallel-coupled microstrip bandpass filter for Software Defined Telescope is presented in this paper. The simulation and optimization is done using ADS and Momentum. The filter is designed and optimized at a center frequency of 1.42GHz. The filter is built on a relatively cheap substrate FR-4 with permittivity 4.4 r   and loss tangent tan 0.02  . Simulation results reveal that the filter operation is optimum over the frequency range 1.41 GHz to 1.44 GHz. The 3 dB bandwidth is thus 300 MHz. the return loss is below-10 dB over the passband. Insertion loss is-2.806 dB in the passband. The filter is almost matched to the characteristic impedance (0 Z), 50 Ohms. Also it is observed that the phase varies linearly with frequency. The filter once fabricated could be used at the radio receiver of the Software Radio Telescope to filter out terrestrial radio interference.

We initially discuss a new and simple method of parameterization of compactly supported biorthogo... more We initially discuss a new and simple method of parameterization of compactly supported biorthogonal wavelet systems with more than one vanishing moment. To this end we express both primal and dual scaling function filters (low pass) as products of two Laurent polynomials. The first factor ensures required vanishing moments and the second factor is parameterized and adjusted to provide required length and other low pass filter requirements. We then impose double shift orthogonality conditions on the resulting two sets of filter coefficients that make them 'Perfect Reconstruction' filters. This modification avoids the use of Diophantine equations and associated spectral factorization method(1,2,3,4) for its derivation. The method is then modified for the parametric and non-parametric orthogonal cases, which includes the derivation for Daubechies filters.

2014 First International Conference on Computational Systems and Communications (ICCSC), 2014

In this paper, the design and evaluation of a low noise amplifier, that operates in the L-band, i... more In this paper, the design and evaluation of a low noise amplifier, that operates in the L-band, is being discussed. The amplifier was fabricated on FR-4 substrate. ATF-58143 Low Noise Enhancement Mode Pseudomorphic High Electron Mobility Transistor [HEMT] is used. The designed LNA is found to have a gain of 13 dB. The return loss is below -10 dB.

Procedia Technology, 2012

In this paper, we share our experience of designing a Trapezoidal Monopole Antenna with truncated... more In this paper, we share our experience of designing a Trapezoidal Monopole Antenna with truncated ground plane for 2.5 GHz Band. Trapezoidal monopole antenna has an omnidirectional radiation pattern. Point-to Multi-Point WiFi system requires an omnidirectional common main antenna to distribute signal to wireless devices and computers. The proposed antenna uses a relatively cheap substrate FR-4 with permittivity ε r = 4.4 and loss tangent tanδ = 0.02. The size of the antenna is 12 × 12cm 2. The ground plate is defected to achieve good impedance matching over the desired frequency band. A 50 Ohm microstrip transmission line acts as the feed for the proposed antenna. The antenna has a Voltage Standing Wave Ratio (VSWR) less than 2 in the frequency band 2.4 GHz to 2.75 GHz. The fractional bandwidth is about 13.5% with respect to the center frequency 2.52 GHz. The design and simulation results are presented in this paper. c

Procedia Engineering, 2012

The lack of spectrum for communication and for research is a bottleneck as far as technology and ... more The lack of spectrum for communication and for research is a bottleneck as far as technology and business development is considered. It is a fact that the availability of useful spectrum is limited by hardware constraints. The studies conducted by the Federal Communications Commission found that that there are many areas of the radio spectrum which are not fully utilized in different geographical areas of the country and FCC recommended locating and utilizing these unused spectrum spaces by other users. This is where spectrum sensing comes into use. From then on different spectrum sensing algorithms were developed. The paper implements four of those major sensing spectrum algorithms in MATLAB-Simulink and also does a performance comparison among them.

2012 International Conference on Advances in Computing and Communications, 2012

This paper is an attempt to reveal the untapped immense power of the GNU Radio - an open source s... more This paper is an attempt to reveal the untapped immense power of the GNU Radio - an open source software, in control and monitoring systems, both real time applications and class-room demonstrations. GNU Radio has already gained wide acceptance and glory in communication and signal processing. As a novel attempt to bring the controlling capability of GNU Radio to limelight, an experiment for temperature control, out of its innumerable applications, and the possibility of a revolution by this free open source software is predicted and explained through this paper. This paper describes the hardware and software requirements for the temperature control experiment with SBHS (Single Board Heater System) using GNU Radio and describes the recommended classroom demonstration.

2013 International Mutli-Conference on Automation, Computing, Communication, Control and Compressed Sensing (iMac4s), 2013

ABSTRACT This paper proposes a low cost, low power, reconfigurable and flexible Open BTS (Base Tr... more ABSTRACT This paper proposes a low cost, low power, reconfigurable and flexible Open BTS (Base Transceiver Station) model based on SDR (Software Defined Radio) using USRP. A microtelecom model serves people at the “bottom of the pyramid” along with ensuring the ROI (Return on Investment) for MNO's (Mobile Network Operators). Thus a new telecom revolution that clubs Microtelecom business model with Open BTS concept would positively affect the socio-economic progress of rural communities, thereby ensuring the overall growth of developing nations. The success of a proposed model of this kind would encourage government to take initiatives and confidently invest on policies that would benefit the low-waged and less-privileged rural communities.

International Journal of Recent Trends in Engineering, 2009

Different mathematical techniques are being developed to reduce the dimensionality of data within... more Different mathematical techniques are being developed to reduce the dimensionality of data within large datasets, for robust retrieval of required information. Latent
Semantic Analysis (LSA), a modified low rank approximation form of Vector Space Model, can be used for detecting underlying semantic relationships within text corpora. LSA performs a low-rank approximation on term-document matrix, which is generated by transforming textual data into a vector representation, thereby bringing out the semantic connectedness present among the documents of the corpus. Singular Value Decomposition (SVD) is the traditional approximation method used for LSA, wherein lower dimensional components from the decomposition are truncated. On truncation, the linguistic noise present in the vector representation is removed, and the semantic connectedness is made visible. One of the pitfalls of using SVD is that the truncated matrix will have negative components, which is not natural for interpreting the textual representation. Nonnegative Matrix Factorization (NMF) addresses this issue by generating non-negative parts-based representation as the low rank approximation for performing LSA. The paper provides an in-depth overview of how both methods are being used for the purpose of Information Retrieval. Performance evaluation of the methods has been performed using standard test datasets.

Large Scale Heterogeneous Wireless Sensor Networks require effective tools for monitoring and man... more Large Scale Heterogeneous Wireless Sensor Networks require effective tools for monitoring and managing the network. In this paper, we discuss about the design and implementation of an application framework in order to monitor and manage a wireless sensor deployment, where the motes exchange IPv6 encapsulated information packets. The application framework is based on a three tier architecture with the nesC/TinyOS based firmware using 'blip' components forming the bottom layer, a middle layer implemented in Python and top layer which is a web interface created using Adobe Flex 4. The implemented features of the application framework include - sensor data acquisition and display, network activity detection of deployed motes, over-the-air programming for software re-visioning, as well as node localization and mapping. The application framework also extends to incorporate the software defined radio based gateway deployed using GNU Radio platform and Universal Software Radio Per...