Mohammed Al-Rayif | King Saud University (original) (raw)
Papers by Mohammed Al-Rayif
Threshold detection for visible light communication using parametric distribution fitting
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields
Visible light communication has gained widespread attention in recent times and is expected to co... more Visible light communication has gained widespread attention in recent times and is expected to complement existing network infrastructure such as wireless local area networks, cellular networks as well as power line communications to provide high speed connectivity. The intensity of the received light depends on the intensity and wavelength of the transmitter, wavelength sensitivity range of the receiver, and also on the ambient light. Depending on the intensity of the received light, a photo‐sensor has to detect and decode the received data, with minimum probability of error. For binary transmission, this is achieved by choosing a decision threshold. In this paper, a threshold detection mechanism is presented by fitting parametric probability distributions to the sensed signal levels. It is shown that the threshold value obtained using this method yields error probability close to zero.
Wireless Personal Communications
Background: More and more high-throughput datasets are available from multiple levels of measurin... more Background: More and more high-throughput datasets are available from multiple levels of measuring gene regulations. The reverse engineering of gene regulatory networks from these data offers a valuable research paradigm to decipher regulatory mechanisms. So far, numerous methods have been developed for reconstructing gene regulatory networks. Results: In this paper, we provide a review of bioinformatics methods for inferring gene regulatory network from omics data. To achieve the precision reconstruction of gene regulatory networks, an intuitive alternative is to integrate these available resources in a rational framework. We also provide computational perspectives in the endeavors of inferring gene regulatory networks from heterogeneous data. We highlight the importance of multi-omics data integration with prior knowledge in gene regulatory network inferences. Conclusions: We provide computational perspectives of inferring gene regulatory networks from multiple omics data and present theoretical analyses of existing challenges and possible solutions. We emphasize on prior knowledge and data integration in network inferences owing to their abilities of identifying regulatory causality.
Low power hardware design and its mathematical modeling for fast‐exact geolocalization system in wireless networks
International Journal of Communication Systems
The increasing penetration of load model in distribution systems may significantly affect voltage... more The increasing penetration of load model in distribution systems may significantly affect voltage stability of the systems, particularly during Low Voltage Ride-Through (LVRT) wind turbine. The main objective of this work is to present the impact of different static and dynamic load models, on the LVRT recovery after disturbances. A component and composite loading structures are considered, comprising static, dynamic motor and a composite model. Motor loads are assessed with respect to their mechanical loads. The polynomial load model using load class and load type is investigated thoroughly under various operating conditions. The present paper examines the effect of nonlinear loads as well as different mechanical torque and inertia of induction motor loads on the transient stability and observing the fault recovery performance of the Doubly-Fed Induction Generator (DFIG) wind turbine system. The dynamic impacts between wind turbines (WTs) and motor loads are also examined. The comp...
Optimal SLM PAPR Reduction based on I/Q-Complex Data Symbol Components
2019 2nd IEEE Middle East and North Africa COMMunications Conference (MENACOMM)
To overcome the significant but unpredicted increase in the peak-to-average power ratio (PAPR) in... more To overcome the significant but unpredicted increase in the peak-to-average power ratio (PAPR) in the presence of an OFDM system, in this paper, a new implementation of an SLM scheme is represented. The effects of the candidate phase vectors on both the real and imaginary parts of the complex data symbols are discussed. Hence, instead of modifying the generated complex data symbol as a single component, the real and imaginary parts are modified independently using a corresponding phase element among a commonly generated phase vector. After applying an inverse fast Fourier transform (IFFT) for the real, imaginary, and original base-band vectors, the (most) minimum peak-to-average-power ratio (PAPR) for each part is observed. The phase vector that introduces the most minimal PAPR is considered to convert the original data block for transmission. This technique is called the optimal I/Q-SLM scheme. According to the results obtained, the CCDF PAPR performance of the proposal acquires greater decibel reduction than a conventional SLM (conv.-SLM) method at different subcarrier length N and candidate phase vectors U. In addition, at different levels of input-back-off (IBO), the power spectral density (PSD) of the original and modified OFDM signals are represented, where the PSD of the proposal shows the best out-of-band characteristic against conv.-SLM.
PAPR Reduction Method based on In-phase/Quadrature Data Symbol Components in MIMO-OFDM Systems
Journal of Communications Software and Systems
To overcome unpredictable spikes in the peak-toaverage power ratio (PAPR) in the presence of an o... more To overcome unpredictable spikes in the peak-toaverage power ratio (PAPR) in the presence of an orthogonal frequency-division multiplexing (OFDM) for multi-input-multioutput (MIMO) systems, implementation of a new SLM scheme is presented in this paper, which is extended from our previous study of IQ-SLM in SISO-OFDM system. In each transmit antenna, both real and imaginary parts of the base-band data symbol were modified independently using a corresponding phase element within a commonly generated phase vector, instead of modifying the complex data symbol as a single component. After applying an inverse fast Fourier transform (IFFT) for the real, imaginary, and original base-band vectors, the minimum PAPR component was observed. Therefore, the phase vector that introduced the minimal PAPR was considered to convert the original data block for transmission. This technique is called the In-phase/Quadrature-SLM (IQ-SLM) scheme. In this proposal, only U phase vectors were generated to treat all Nt data blocks, simultaneously, unlike the conventional MIMO-SLM techniques which generate U Nt candidate phase blocks. The thing which, in turn, can be considered as a further computational complexity reduction, specifically in data-phase conversion stages. As a result, in terms of the complementary cumulative distribution function of PAPR performance(CCDF-PAPR), the proposal achieved a greater decibel reduction than conventional SLM methods such as dSLM, oSLM, and sSLM, at different subcarrier lengths N , candidate phase vectors U , transmit antennas Nt. Also, it shows a comparable BER performances over the dSLM scheme referencing to the theoretical curves, in the case where Nt ≤ Nr for both zero-forcing (ZF) and ZF with vertical Bell laboratories layered space-time (V-BLAST) detector.
JOURNAL OF COMMUNICATIONS SOFTWARE AND SYSTEMS, 2021
To overcome unpredictable spikes in the peak-toaverage power ratio (PAPR) in the presence of an o... more To overcome unpredictable spikes in the peak-toaverage power ratio (PAPR) in the presence of an orthogonal frequency-division multiplexing (OFDM) for multi-input-multioutput (MIMO) systems, implementation of a new SLM scheme is presented in this paper, which is extended from our previous study of IQ-SLM in SISO-OFDM system. In each transmit antenna, both real and imaginary parts of the base-band data symbol were modified independently using a corresponding phase element within a commonly generated phase vector, instead of modifying the complex data symbol as a single component. After applying an inverse fast Fourier transform (IFFT) for the real, imaginary, and original base-band vectors, the minimum PAPR component was observed. Therefore, the phase vector that introduced the minimal PAPR was considered to convert the original data block for transmission. This technique is called the In-phase/Quadrature-SLM (IQ-SLM) scheme. In this proposal, only U phase vectors were generated to treat all Nt data blocks, simultaneously, unlike the conventional MIMO-SLM techniques which generate U Nt candidate phase blocks. The thing which, in turn, can be considered as a further computational complexity reduction, specifically in data-phase conversion stages. As a result, in terms of the complementary cumulative distribution function of PAPR performance(CCDF-PAPR), the proposal achieved a greater decibel reduction than conventional SLM methods such as dSLM, oSLM, and sSLM, at different subcarrier lengths N , candidate phase vectors U , transmit antennas Nt. Also, it shows a comparable BER performances over the dSLM scheme referencing to the theoretical curves, in the case where Nt ≤ Nr for both zero-forcing (ZF) and ZF with vertical Bell laboratories layered space-time (V-BLAST) detector.
Electronics
Universal filtered multi-carrier (UFMC) is a potential multi-carrier system for future cellular n... more Universal filtered multi-carrier (UFMC) is a potential multi-carrier system for future cellular networks. UFMC provides low latency, frequency offset robustness, and reduced out-of-band (OOB) emission that results in better spectral efficiency. However, UFMC suffers from the problem of high peak-to-average power ratio (PAPR), which might impact the function of high power amplifiers causing a nonlinear distortion. We propose a comparative probabilistic PAPR reduction technique, called the decomposed selective mapping approach, to alleviate PAPR in UFMC systems. The concept of this proposal depends on decomposing the complex symbol into real and imaginary parts, and then converting each part to a number of different phase vectors prior to the inverse fast Fourier transform (IFFT) operation. The IFFT copy, which introduces the lowest PAPR, is considered for transmission. Results obtained using theoretical analysis and simulations show that the proposed approach can significantly enhanc...
Low Complexity Joint PAPR Reduction and Demodulation Technique for OFDM Systems
IETE Journal of Research
IEEE Photonics Journal
One of the main drawbacks of orthogonal frequency division multiplexing (OFDM) is the unpredictab... more One of the main drawbacks of orthogonal frequency division multiplexing (OFDM) is the unpredictable significant increase in the peak-to-average power ratio (PAPR), due to the large dynamic range of the OFDM symbol waveforms. To overcome this problem, we propose a novel PAPR reduction technique in the transmitter DSP of a fiber mobile front-haul network, named as iterative selective mapping (I-SLM). The proposed algorithm uses orthogonal phase vectors construction. Several alternative sets of OFDM symbol is iteratively generated by deterministic sets of orthogonal phase vectors and the one which introduces the lowest peak power value is considered for transmission. Simulation results demonstrate a substantial PAPR reduction, comparing to the partial orthogonal selective mapping (POSLM), especially when the number of iterations increases in the presence of different variables, such as, the number of OFDM subcarriers/frame and the modulation order.
Low complexity equalization techniques using interference cancellation for SC-FDMA uplink systems under doubly selective channels
International Journal of Communication Systems
Low complexity equalization techniques using interference cancellation for SC-FDMA uplink systems under doubly selective channels
International Journal of Communication Systems
Threshold Detection for Visible Light Communication Using Parametric Distribution Fitting
Visible light communication (VLC) has gained widespread attention in recent times and is expected... more Visible light communication (VLC) has gained widespread attention in recent times and is expected to complement existing network infrastructure such as wireless local area networks (WLAN’s), cellular networks as well as power line communications to provide high speed connectivity. The intensity of the received light depends on the intensity and wavelength of the transmitter, wavelength sensitivity range of the receiver and also on the ambient light. Depending on the intensity of the received light, a photo- sensor has to detect and decode the received data, with minimum probability of error. For binary transmission, this is achieved by choosing a decision threshold. In this paper, a threshold detection mechanism is presented by fitting parametric probability distributions to the sensed signal levels. It is shown that the threshold value obtained using this method yields error probability close to zero.
Partially orthogonal SLM in SISO OFDM system without side information
2012 International Symposium on Wireless Communication Systems (ISWCS), 2012
Threshold detection for visible light communication using parametric distribution fitting
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields
Visible light communication has gained widespread attention in recent times and is expected to co... more Visible light communication has gained widespread attention in recent times and is expected to complement existing network infrastructure such as wireless local area networks, cellular networks as well as power line communications to provide high speed connectivity. The intensity of the received light depends on the intensity and wavelength of the transmitter, wavelength sensitivity range of the receiver, and also on the ambient light. Depending on the intensity of the received light, a photo‐sensor has to detect and decode the received data, with minimum probability of error. For binary transmission, this is achieved by choosing a decision threshold. In this paper, a threshold detection mechanism is presented by fitting parametric probability distributions to the sensed signal levels. It is shown that the threshold value obtained using this method yields error probability close to zero.
Wireless Personal Communications
Background: More and more high-throughput datasets are available from multiple levels of measurin... more Background: More and more high-throughput datasets are available from multiple levels of measuring gene regulations. The reverse engineering of gene regulatory networks from these data offers a valuable research paradigm to decipher regulatory mechanisms. So far, numerous methods have been developed for reconstructing gene regulatory networks. Results: In this paper, we provide a review of bioinformatics methods for inferring gene regulatory network from omics data. To achieve the precision reconstruction of gene regulatory networks, an intuitive alternative is to integrate these available resources in a rational framework. We also provide computational perspectives in the endeavors of inferring gene regulatory networks from heterogeneous data. We highlight the importance of multi-omics data integration with prior knowledge in gene regulatory network inferences. Conclusions: We provide computational perspectives of inferring gene regulatory networks from multiple omics data and present theoretical analyses of existing challenges and possible solutions. We emphasize on prior knowledge and data integration in network inferences owing to their abilities of identifying regulatory causality.
Low power hardware design and its mathematical modeling for fast‐exact geolocalization system in wireless networks
International Journal of Communication Systems
The increasing penetration of load model in distribution systems may significantly affect voltage... more The increasing penetration of load model in distribution systems may significantly affect voltage stability of the systems, particularly during Low Voltage Ride-Through (LVRT) wind turbine. The main objective of this work is to present the impact of different static and dynamic load models, on the LVRT recovery after disturbances. A component and composite loading structures are considered, comprising static, dynamic motor and a composite model. Motor loads are assessed with respect to their mechanical loads. The polynomial load model using load class and load type is investigated thoroughly under various operating conditions. The present paper examines the effect of nonlinear loads as well as different mechanical torque and inertia of induction motor loads on the transient stability and observing the fault recovery performance of the Doubly-Fed Induction Generator (DFIG) wind turbine system. The dynamic impacts between wind turbines (WTs) and motor loads are also examined. The comp...
Optimal SLM PAPR Reduction based on I/Q-Complex Data Symbol Components
2019 2nd IEEE Middle East and North Africa COMMunications Conference (MENACOMM)
To overcome the significant but unpredicted increase in the peak-to-average power ratio (PAPR) in... more To overcome the significant but unpredicted increase in the peak-to-average power ratio (PAPR) in the presence of an OFDM system, in this paper, a new implementation of an SLM scheme is represented. The effects of the candidate phase vectors on both the real and imaginary parts of the complex data symbols are discussed. Hence, instead of modifying the generated complex data symbol as a single component, the real and imaginary parts are modified independently using a corresponding phase element among a commonly generated phase vector. After applying an inverse fast Fourier transform (IFFT) for the real, imaginary, and original base-band vectors, the (most) minimum peak-to-average-power ratio (PAPR) for each part is observed. The phase vector that introduces the most minimal PAPR is considered to convert the original data block for transmission. This technique is called the optimal I/Q-SLM scheme. According to the results obtained, the CCDF PAPR performance of the proposal acquires greater decibel reduction than a conventional SLM (conv.-SLM) method at different subcarrier length N and candidate phase vectors U. In addition, at different levels of input-back-off (IBO), the power spectral density (PSD) of the original and modified OFDM signals are represented, where the PSD of the proposal shows the best out-of-band characteristic against conv.-SLM.
PAPR Reduction Method based on In-phase/Quadrature Data Symbol Components in MIMO-OFDM Systems
Journal of Communications Software and Systems
To overcome unpredictable spikes in the peak-toaverage power ratio (PAPR) in the presence of an o... more To overcome unpredictable spikes in the peak-toaverage power ratio (PAPR) in the presence of an orthogonal frequency-division multiplexing (OFDM) for multi-input-multioutput (MIMO) systems, implementation of a new SLM scheme is presented in this paper, which is extended from our previous study of IQ-SLM in SISO-OFDM system. In each transmit antenna, both real and imaginary parts of the base-band data symbol were modified independently using a corresponding phase element within a commonly generated phase vector, instead of modifying the complex data symbol as a single component. After applying an inverse fast Fourier transform (IFFT) for the real, imaginary, and original base-band vectors, the minimum PAPR component was observed. Therefore, the phase vector that introduced the minimal PAPR was considered to convert the original data block for transmission. This technique is called the In-phase/Quadrature-SLM (IQ-SLM) scheme. In this proposal, only U phase vectors were generated to treat all Nt data blocks, simultaneously, unlike the conventional MIMO-SLM techniques which generate U Nt candidate phase blocks. The thing which, in turn, can be considered as a further computational complexity reduction, specifically in data-phase conversion stages. As a result, in terms of the complementary cumulative distribution function of PAPR performance(CCDF-PAPR), the proposal achieved a greater decibel reduction than conventional SLM methods such as dSLM, oSLM, and sSLM, at different subcarrier lengths N , candidate phase vectors U , transmit antennas Nt. Also, it shows a comparable BER performances over the dSLM scheme referencing to the theoretical curves, in the case where Nt ≤ Nr for both zero-forcing (ZF) and ZF with vertical Bell laboratories layered space-time (V-BLAST) detector.
JOURNAL OF COMMUNICATIONS SOFTWARE AND SYSTEMS, 2021
To overcome unpredictable spikes in the peak-toaverage power ratio (PAPR) in the presence of an o... more To overcome unpredictable spikes in the peak-toaverage power ratio (PAPR) in the presence of an orthogonal frequency-division multiplexing (OFDM) for multi-input-multioutput (MIMO) systems, implementation of a new SLM scheme is presented in this paper, which is extended from our previous study of IQ-SLM in SISO-OFDM system. In each transmit antenna, both real and imaginary parts of the base-band data symbol were modified independently using a corresponding phase element within a commonly generated phase vector, instead of modifying the complex data symbol as a single component. After applying an inverse fast Fourier transform (IFFT) for the real, imaginary, and original base-band vectors, the minimum PAPR component was observed. Therefore, the phase vector that introduced the minimal PAPR was considered to convert the original data block for transmission. This technique is called the In-phase/Quadrature-SLM (IQ-SLM) scheme. In this proposal, only U phase vectors were generated to treat all Nt data blocks, simultaneously, unlike the conventional MIMO-SLM techniques which generate U Nt candidate phase blocks. The thing which, in turn, can be considered as a further computational complexity reduction, specifically in data-phase conversion stages. As a result, in terms of the complementary cumulative distribution function of PAPR performance(CCDF-PAPR), the proposal achieved a greater decibel reduction than conventional SLM methods such as dSLM, oSLM, and sSLM, at different subcarrier lengths N , candidate phase vectors U , transmit antennas Nt. Also, it shows a comparable BER performances over the dSLM scheme referencing to the theoretical curves, in the case where Nt ≤ Nr for both zero-forcing (ZF) and ZF with vertical Bell laboratories layered space-time (V-BLAST) detector.
Electronics
Universal filtered multi-carrier (UFMC) is a potential multi-carrier system for future cellular n... more Universal filtered multi-carrier (UFMC) is a potential multi-carrier system for future cellular networks. UFMC provides low latency, frequency offset robustness, and reduced out-of-band (OOB) emission that results in better spectral efficiency. However, UFMC suffers from the problem of high peak-to-average power ratio (PAPR), which might impact the function of high power amplifiers causing a nonlinear distortion. We propose a comparative probabilistic PAPR reduction technique, called the decomposed selective mapping approach, to alleviate PAPR in UFMC systems. The concept of this proposal depends on decomposing the complex symbol into real and imaginary parts, and then converting each part to a number of different phase vectors prior to the inverse fast Fourier transform (IFFT) operation. The IFFT copy, which introduces the lowest PAPR, is considered for transmission. Results obtained using theoretical analysis and simulations show that the proposed approach can significantly enhanc...
Low Complexity Joint PAPR Reduction and Demodulation Technique for OFDM Systems
IETE Journal of Research
IEEE Photonics Journal
One of the main drawbacks of orthogonal frequency division multiplexing (OFDM) is the unpredictab... more One of the main drawbacks of orthogonal frequency division multiplexing (OFDM) is the unpredictable significant increase in the peak-to-average power ratio (PAPR), due to the large dynamic range of the OFDM symbol waveforms. To overcome this problem, we propose a novel PAPR reduction technique in the transmitter DSP of a fiber mobile front-haul network, named as iterative selective mapping (I-SLM). The proposed algorithm uses orthogonal phase vectors construction. Several alternative sets of OFDM symbol is iteratively generated by deterministic sets of orthogonal phase vectors and the one which introduces the lowest peak power value is considered for transmission. Simulation results demonstrate a substantial PAPR reduction, comparing to the partial orthogonal selective mapping (POSLM), especially when the number of iterations increases in the presence of different variables, such as, the number of OFDM subcarriers/frame and the modulation order.
Low complexity equalization techniques using interference cancellation for SC-FDMA uplink systems under doubly selective channels
International Journal of Communication Systems
Low complexity equalization techniques using interference cancellation for SC-FDMA uplink systems under doubly selective channels
International Journal of Communication Systems
Threshold Detection for Visible Light Communication Using Parametric Distribution Fitting
Visible light communication (VLC) has gained widespread attention in recent times and is expected... more Visible light communication (VLC) has gained widespread attention in recent times and is expected to complement existing network infrastructure such as wireless local area networks (WLAN’s), cellular networks as well as power line communications to provide high speed connectivity. The intensity of the received light depends on the intensity and wavelength of the transmitter, wavelength sensitivity range of the receiver and also on the ambient light. Depending on the intensity of the received light, a photo- sensor has to detect and decode the received data, with minimum probability of error. For binary transmission, this is achieved by choosing a decision threshold. In this paper, a threshold detection mechanism is presented by fitting parametric probability distributions to the sensed signal levels. It is shown that the threshold value obtained using this method yields error probability close to zero.
Partially orthogonal SLM in SISO OFDM system without side information
2012 International Symposium on Wireless Communication Systems (ISWCS), 2012