Arifour Rahman | University of Rajshahi, Bangladesh (original) (raw)

Papers by Arifour Rahman

Research paper thumbnail of Design and Performance Analysis of Defected Ground Slotted Patch Antenna for Sub-6 GHz 5G Applications

Recently, there have been notable advancements in wireless communication systems to address the d... more Recently, there have been notable advancements in wireless communication systems to address the deficiencies of fourth generation (4G) wireless technology, such as insufficient spectrum bandwidth, slow data transfer rates, and constrained network capacity. These issues may be addressed in fifth generation (5G) wireless technology, which is no longer stand-alone. This article proposes and designs a defected ground slotted patch antenna (DGSPA) for 5G (Sub-6 GHz band) applications. It can work at 3.5 GHz in the 5G N77 band, Sub-6 GHz 5G, LTE Band 42, and WiMAX. The suggested antenna has an overall dimension of 38 × 38 × 1.575 mm3 and is built on the Rogers RT5880 substrate material, whose dielectric permittivity is 2.2. The CST software is used as the simulation tool to analyze the designed antenna's performance. The novelty of the recommended antenna is in terms of its small size with defective ground structure (DGS), high antenna gain, perfect impedance matching, and improved impedance bandwidth. The role of the DGS is evaluated by comparing the antenna's performance with and without the DGS. It has been noticed that the DGS-backed antenna had an impedance bandwidth improvement of more than 11MHz, whereas the impedance profile is (50.086 -𝑗0.179) Ω, which denotes 50 Ω pure resistivity. It will operate within the frequency range of (3.4828 -3.522) GHz with an impedance bandwidth of 69.2 MHz. The proposed antenna's reflection coefficient (|𝑆 1,1 |) is obtained as -54.028 dB at the resonating frequency of 3.5176 GHz, whereas the radiation gain and efficiency are observed as 6.463 dB and 93.475%, respectively. Thus, due to its promising performance based on radiation pattern, optimum efficiency, and higher bandwidth, the recommended defected ground slotted patch antenna can efficiently be used for the application of Sub-6 GHz 5G services.

Research paper thumbnail of Spectrum estimation for voiced speech using average weighted linear prediction

World Journal Of Advanced Research and Reviews, May 30, 2024

Research paper thumbnail of Spectrum Compensation Method for Speech Signals Based on Prediction Error Filtering

WSEAS Transactions on Systems and Control archive, 2017

This paper proposes a technique for improving the performance of linear prediction (LP) by utiliz... more This paper proposes a technique for improving the performance of linear prediction (LP) by utilizing the prediction error filter (PEF) as a pre-processor. Problems often occur in estimating the power spectrum of the input speech signal using LP due to the large spectral dynamic range of speech which makes the autocorrelation matrix ill-conditioned. In the proposed method, the LP based power spectrum estimation is compensated by the spectrum characteristics of the designed PEF. The accuracy of formant frequency estimation is verified on synthetic speech. The validity of the proposed method is also illustrated by inspecting real air conducted and bone conducted speeches. Through the experiments, we show that the proposed method can estimate the power spectrum more accurately than the conventional direct and pre-emphasis LP methods

Research paper thumbnail of Linear-Prediction-Based Accurate Spectrum Estimation with Pitch Extension for Bone-Conducted Speech

Journal of Signal Processing, 2018

This paper proposes an approach to pitch-synchronous linear prediction (LP) for bone-conducted (B... more This paper proposes an approach to pitch-synchronous linear prediction (LP) for bone-conducted (BC) voiced speech. A combination of the spectral compensation (SC) method with pitch extension LP is used to obtain a more accurate power spectrum of the BC speech signal. Simulation experiments show that the proposed method provides better performance than the conventional autocorrelation and original SC methods.

Research paper thumbnail of Accurate Power Spectrum Estimation of Speech with Spectrum Compensation Based on Prediction Error Filtering

WSEAS Transactions on Signal Processing archive, 2017

This paper proposes a linear prediction (LP) method to estimate accurately the original power spe... more This paper proposes a linear prediction (LP) method to estimate accurately the original power spectrum of the input speech signal. A prediction error filter (PEF) is used as a pre-processor, and the LP based power spectrum estimation is compensated by the frequency characteristics of the designed PEF. Through experiments on synthetic vowels, we show that the proposed spectrum compensation method can estimate the power spectrum more accurately than the direct and pre-emphasis LP methods.

Research paper thumbnail of LP-Based Quality Improvement of Noisy Bone Conducted Speech

IEEJ Transactions on Electronics, Information and Systems, 2017

Research paper thumbnail of The Study of Geological Constituents of Mid-Atlantic Oceanic Crust with the Application of Attributes in Seismic Profiles

The geologic constituents of the mid Atlantic seismic profiles have been studied with attributes ... more The geologic constituents of the mid Atlantic seismic profiles have been studied with attributes analysis to make a bridge in between geology and seismic. Attributes computation is justified for one test signal. Later the amplitude and frequency attributes have been estimated the mid Atlantic region seismic profiles. The image made in this work is found better than that of the

Research paper thumbnail of Design and Performance Analysis of Defected Ground Slotted Patch Antenna for Sub-6 GHz 5G Applications

Recently, there have been notable advancements in wireless communication systems to address the d... more Recently, there have been notable advancements in wireless communication systems to address the deficiencies of fourth generation (4G) wireless technology, such as insufficient spectrum bandwidth, slow data transfer rates, and constrained network capacity. These issues may be addressed in fifth generation (5G) wireless technology, which is no longer stand-alone. This article proposes and designs a defected ground slotted patch antenna (DGSPA) for 5G (Sub-6 GHz band) applications. It can work at 3.5 GHz in the 5G N77 band, Sub-6 GHz 5G, LTE Band 42, and WiMAX. The suggested antenna has an overall dimension of 38 × 38 × 1.575 mm3 and is built on the Rogers RT5880 substrate material, whose dielectric permittivity is 2.2. The CST software is used as the simulation tool to analyze the designed antenna's performance. The novelty of the recommended antenna is in terms of its small size with defective ground structure (DGS), high antenna gain, perfect impedance matching, and improved impedance bandwidth. The role of the DGS is evaluated by comparing the antenna's performance with and without the DGS. It has been noticed that the DGS-backed antenna had an impedance bandwidth improvement of more than 11MHz, whereas the impedance profile is (50.086 -𝑗0.179) Ω, which denotes 50 Ω pure resistivity. It will operate within the frequency range of (3.4828 -3.522) GHz with an impedance bandwidth of 69.2 MHz. The proposed antenna's reflection coefficient (|𝑆 1,1 |) is obtained as -54.028 dB at the resonating frequency of 3.5176 GHz, whereas the radiation gain and efficiency are observed as 6.463 dB and 93.475%, respectively. Thus, due to its promising performance based on radiation pattern, optimum efficiency, and higher bandwidth, the recommended defected ground slotted patch antenna can efficiently be used for the application of Sub-6 GHz 5G services.

Research paper thumbnail of Spectrum estimation for voiced speech using average weighted linear prediction

World Journal Of Advanced Research and Reviews, May 30, 2024

Research paper thumbnail of Spectrum Compensation Method for Speech Signals Based on Prediction Error Filtering

WSEAS Transactions on Systems and Control archive, 2017

This paper proposes a technique for improving the performance of linear prediction (LP) by utiliz... more This paper proposes a technique for improving the performance of linear prediction (LP) by utilizing the prediction error filter (PEF) as a pre-processor. Problems often occur in estimating the power spectrum of the input speech signal using LP due to the large spectral dynamic range of speech which makes the autocorrelation matrix ill-conditioned. In the proposed method, the LP based power spectrum estimation is compensated by the spectrum characteristics of the designed PEF. The accuracy of formant frequency estimation is verified on synthetic speech. The validity of the proposed method is also illustrated by inspecting real air conducted and bone conducted speeches. Through the experiments, we show that the proposed method can estimate the power spectrum more accurately than the conventional direct and pre-emphasis LP methods

Research paper thumbnail of Linear-Prediction-Based Accurate Spectrum Estimation with Pitch Extension for Bone-Conducted Speech

Journal of Signal Processing, 2018

This paper proposes an approach to pitch-synchronous linear prediction (LP) for bone-conducted (B... more This paper proposes an approach to pitch-synchronous linear prediction (LP) for bone-conducted (BC) voiced speech. A combination of the spectral compensation (SC) method with pitch extension LP is used to obtain a more accurate power spectrum of the BC speech signal. Simulation experiments show that the proposed method provides better performance than the conventional autocorrelation and original SC methods.

Research paper thumbnail of Accurate Power Spectrum Estimation of Speech with Spectrum Compensation Based on Prediction Error Filtering

WSEAS Transactions on Signal Processing archive, 2017

This paper proposes a linear prediction (LP) method to estimate accurately the original power spe... more This paper proposes a linear prediction (LP) method to estimate accurately the original power spectrum of the input speech signal. A prediction error filter (PEF) is used as a pre-processor, and the LP based power spectrum estimation is compensated by the frequency characteristics of the designed PEF. Through experiments on synthetic vowels, we show that the proposed spectrum compensation method can estimate the power spectrum more accurately than the direct and pre-emphasis LP methods.

Research paper thumbnail of LP-Based Quality Improvement of Noisy Bone Conducted Speech

IEEJ Transactions on Electronics, Information and Systems, 2017

Research paper thumbnail of The Study of Geological Constituents of Mid-Atlantic Oceanic Crust with the Application of Attributes in Seismic Profiles

The geologic constituents of the mid Atlantic seismic profiles have been studied with attributes ... more The geologic constituents of the mid Atlantic seismic profiles have been studied with attributes analysis to make a bridge in between geology and seismic. Attributes computation is justified for one test signal. Later the amplitude and frequency attributes have been estimated the mid Atlantic region seismic profiles. The image made in this work is found better than that of the