EURASIP Journal on Advances in Signal Processing, Mar 16, 2009
Sigma-delta modulated systems have a number of very appealing properties and are, therefore, heav... more Sigma-delta modulated systems have a number of very appealing properties and are, therefore, heavily used in analog to digital converters, amplifiers, and modulators. This paper presents new results which indicate that they may also have significant potential for general purpose arithmetic processing. The paper introduces new arithmetic processing structures for ternary (i.e., +1, 0, or β1) sigma-delta modulated signals. Simulations show that these new structures can be implemented very efficiently and have relatively good accuracy.
A design criterion for the determination of both the optimum thickness and bandgaps of multijunct... more A design criterion for the determination of both the optimum thickness and bandgaps of multijunction a-Si:H solar cells for obtaining the highest conversion efficiency for a given spectral irradiance is described. A three-dimensional diagram is plotted that correlates the above-mentioned design parameters, indicating the best optical matching among the different layers. It can be adapted to study the sensitivity of
Drones are currently being used in a wide range of useful tasks that are too dangerous or/ and ex... more Drones are currently being used in a wide range of useful tasks that are too dangerous or/ and expensive to be performed by humans. However, this is increasingly developing security breaching issues due to the possibility of misuse of unmanned aircraft in illegal activities such as drug smuggling, terrorism, etc. Thus, the detection and tracking of drones are becoming a crucial topic. Unfortunately, due to the drone's small size, its detection methods are generally unreliable: high false alarm rate, low accuracy rate, and low detection speed are well-known aspects of this detection. The new emerging realtime algorithm based on the improved "You Only Look Once" (YOLO-V3) algorithm is proposed here for drone detection. This newly designed algorithm comprises multiple phases and has shown the potential to outperform the traditional detection approaches. The proposed algorithm enhances the performance of YOLO-V3 by designing and building a CNN to solve the problem of a large number of YOLO-V3 parameters, using densely connected modules to enhance the interlayer connection of CNNs and further strengthen the connection between dense neural network blocks, and finally improving the YOLO-V3 multiple-scale detection by expanding the three-scale to four-scale detection to increase the accuracy of detecting small objects like drones. The evaluation results of our algorithm obtain 96% on average precision and 95.60% accuracy.
Page 1. Circular 16-QAM Modulation Scheme for Wavelet and Fourier Based OFDM Systems Khaizuran Ab... more Page 1. Circular 16-QAM Modulation Scheme for Wavelet and Fourier Based OFDM Systems Khaizuran Abdullah, Noura Al-Hinai, Amin Z. Sadik β , MIEEE, and Zahir M. Hussain, SMIEEE School of Electrical & Computer Engineering ...
International Journal of Communications, Network and System Sciences, 2011
Adaptive bit-loading algorithms can improve the performance of OFDM systems significantly. The tr... more Adaptive bit-loading algorithms can improve the performance of OFDM systems significantly. The tradeoff between the performance of the algorithm and its computational complexity is essential for the implementation of loading algorithms. In this paper, we present a low complexity non-iterative discrete bit-loading algorithm to maximize the data rate subject to specified target BER and uniform power allocation. Simulation results show that the proposed algorithm outperforms the equal-BER loading and achieves similar rates to incremental allocation, yet with much lower complexity.
2009 5th IEEE GCC Conference and Exhibition, GCC 2009, 2009
Abstract We demonstrate simulation approaches for wavelet based OFDM, particularly in DWT and WPT... more Abstract We demonstrate simulation approaches for wavelet based OFDM, particularly in DWT and WPT-OFDM as alternative substitutions for Fourier based OFDM. We begin by constructing the models of the inverse and forward transforms, which can be flexible for ...
In this paper, a new design of a single-bit adaptive channel equalization is proposed using sigma... more In this paper, a new design of a single-bit adaptive channel equalization is proposed using sigma delta modulation and a single-bit block Least Mean Square (LMS) algorithm. With correlated narrowband input signals, this model is capable to converge and provide equivalent equalization filter with improvement in the SNR and very low Symbol Error Rate (SER). The input, filter coefficients and output values are all in single-bit and ternary format that results in a reduction in hardware complexity compared to traditional multi-bit channel equalization. Additionally, the technique avoids the need for successive conversion from multi-bit to single bit and back at the receiver and transmitter stages.
β A design technique for a single-bit digital comb filter is presented. The proposed filter respo... more β A design technique for a single-bit digital comb filter is presented. The proposed filter response and performance are assessed in terms of signal-to-quantization-noise ratio (SQNR) and stability. It is found that the comb filter possesses a distinct frequency response in broadband signal applications. The same technique is utilized to design and simulate a single-bit N-period digital resonator. Feedback loop filters can be used to tune the frequency response of the Ξ£ β modulators. The proposed design technique is efficient in hardware implementation. I.
In this paper, a single-bit DC-blocker is presented. It is comprised of a ternary filtering stage... more In this paper, a single-bit DC-blocker is presented. It is comprised of a ternary filtering stage preceded by a sigma-delta modulator. Different techniques are used to generate the ternary taps for hardware and performance optimization. Both the input and the output of this DC-blocker are assumed in single-bit format. The proposed DC-blocker can easily be implemented with FPGA.
Impulsive noise is one of the major challenges in power line communications and can degrade the p... more Impulsive noise is one of the major challenges in power line communications and can degrade the performance of OFDM-based PLC systems significantly. In this paper, we adopt a practically proven channel model for broadband power line communication and utilize it to study and compare the BER performance of three nonlinear time-domain impulsive noise mitigation techniques: clipping, blanking and clipping/blanking. Three noise environments, namely "heavily disturbed", "medium disturbed" and "weakly disturbed", that are based on practical measurements are used to investigate the performance of impulsive noise reduction schemes by means of computer simulations.
... ternary structure,β IEEE TENCON 2006, Accepted, 2006. 7. Amin Z. Sadik and Zahir M. Hussain, ... more ... ternary structure,β IEEE TENCON 2006, Accepted, 2006. 7. Amin Z. Sadik and Zahir M. Hussain, βNew DSP Using Short Word-Length,β International DSP Creative Design Contest (DSPCDC'2006), Southern Taiwan University of Technology (STUT), Ministry of Edu-...
The presence of impulsive noise in any power line channel is typical. In this paper, parameters s... more The presence of impulsive noise in any power line channel is typical. In this paper, parameters such as "interarrival" times are employed for the measurement of different impulsive noise scenarios. BER analysis is performed to compare the performance of the channel for the two types of impulsive noise under three different scenarios, with different number of subcarriers.
Int'l J. of Communications, Network and System Sciences, 2011
Adaptive bit-loading algorithms can improve the performance of OFDM systems significantly. The tr... more Adaptive bit-loading algorithms can improve the performance of OFDM systems significantly. The tradeoff between the performance of the algorithm and its computational complexity is essential for the implementation of loading algorithms. In this paper, we present a low complexity non-iterative discrete bit-loading algorithm to maximize the data rate subject to specified target BER and uniform power allocation. Simulation results show that the proposed algorithm outperforms the equal-BER loading and achieves similar rates to incremental allocation, yet with much lower complexity.
Transmission of a compressed still images using FFT-OFDM over PLC channels with additive white Ga... more Transmission of a compressed still images using FFT-OFDM over PLC channels with additive white Gaussian noise (AWGN) and impulsive noise is tackled. Discrete Wavelet Transform (DWT) is used as one of the compression techniques and it is compared with another compression method, which is Block Truncation Coding (BTC). A comparison between the two methods is carried out in terms of compression factor, and quality of the image. In addition, the effect of multipath on DWT and BTC is studied. Experimental results have showed that BTC method has proven to be more efficient than the DWT method in terms of the above mentioned criteria.
EURASIP Journal on Advances in Signal Processing, 2007
The DC content in single-bit domain is both undesirable and hard to remove. In this paper we prop... more The DC content in single-bit domain is both undesirable and hard to remove. In this paper we propose a single-bit multiplierless DC-blocker structure. The input is assumed to be sigma-delta modulated bitstream. This DC-blocker is designed using a delta modulator topology with a sigma-delta modulator (SDM) embedded in its feedback path. Its performance is investigated in terms of the overall signal-to-noise ratio, the effectiveness of DC removal, and the stability. The proposed structure is efficient for hardware realisation.
Proceedings of the 2008 Australasian Telecommunication Networks and Applications Conference, ATNAC 2008, 2008
The clipping and filtering method is analyzed in terms of power savings. The analysis takes accou... more The clipping and filtering method is analyzed in terms of power savings. The analysis takes account of the gain in the amplifier efficiency due to Peak-to-Average-Power-Ratio (PAPR) reduction. Assuming a linear amplifier and a typical digital signal processor, the power savings is shown to be in the order of Watts.
EURASIP Journal on Advances in Signal Processing, Mar 16, 2009
Sigma-delta modulated systems have a number of very appealing properties and are, therefore, heav... more Sigma-delta modulated systems have a number of very appealing properties and are, therefore, heavily used in analog to digital converters, amplifiers, and modulators. This paper presents new results which indicate that they may also have significant potential for general purpose arithmetic processing. The paper introduces new arithmetic processing structures for ternary (i.e., +1, 0, or β1) sigma-delta modulated signals. Simulations show that these new structures can be implemented very efficiently and have relatively good accuracy.
A design criterion for the determination of both the optimum thickness and bandgaps of multijunct... more A design criterion for the determination of both the optimum thickness and bandgaps of multijunction a-Si:H solar cells for obtaining the highest conversion efficiency for a given spectral irradiance is described. A three-dimensional diagram is plotted that correlates the above-mentioned design parameters, indicating the best optical matching among the different layers. It can be adapted to study the sensitivity of
Drones are currently being used in a wide range of useful tasks that are too dangerous or/ and ex... more Drones are currently being used in a wide range of useful tasks that are too dangerous or/ and expensive to be performed by humans. However, this is increasingly developing security breaching issues due to the possibility of misuse of unmanned aircraft in illegal activities such as drug smuggling, terrorism, etc. Thus, the detection and tracking of drones are becoming a crucial topic. Unfortunately, due to the drone's small size, its detection methods are generally unreliable: high false alarm rate, low accuracy rate, and low detection speed are well-known aspects of this detection. The new emerging realtime algorithm based on the improved "You Only Look Once" (YOLO-V3) algorithm is proposed here for drone detection. This newly designed algorithm comprises multiple phases and has shown the potential to outperform the traditional detection approaches. The proposed algorithm enhances the performance of YOLO-V3 by designing and building a CNN to solve the problem of a large number of YOLO-V3 parameters, using densely connected modules to enhance the interlayer connection of CNNs and further strengthen the connection between dense neural network blocks, and finally improving the YOLO-V3 multiple-scale detection by expanding the three-scale to four-scale detection to increase the accuracy of detecting small objects like drones. The evaluation results of our algorithm obtain 96% on average precision and 95.60% accuracy.
Page 1. Circular 16-QAM Modulation Scheme for Wavelet and Fourier Based OFDM Systems Khaizuran Ab... more Page 1. Circular 16-QAM Modulation Scheme for Wavelet and Fourier Based OFDM Systems Khaizuran Abdullah, Noura Al-Hinai, Amin Z. Sadik β , MIEEE, and Zahir M. Hussain, SMIEEE School of Electrical & Computer Engineering ...
International Journal of Communications, Network and System Sciences, 2011
Adaptive bit-loading algorithms can improve the performance of OFDM systems significantly. The tr... more Adaptive bit-loading algorithms can improve the performance of OFDM systems significantly. The tradeoff between the performance of the algorithm and its computational complexity is essential for the implementation of loading algorithms. In this paper, we present a low complexity non-iterative discrete bit-loading algorithm to maximize the data rate subject to specified target BER and uniform power allocation. Simulation results show that the proposed algorithm outperforms the equal-BER loading and achieves similar rates to incremental allocation, yet with much lower complexity.
2009 5th IEEE GCC Conference and Exhibition, GCC 2009, 2009
Abstract We demonstrate simulation approaches for wavelet based OFDM, particularly in DWT and WPT... more Abstract We demonstrate simulation approaches for wavelet based OFDM, particularly in DWT and WPT-OFDM as alternative substitutions for Fourier based OFDM. We begin by constructing the models of the inverse and forward transforms, which can be flexible for ...
In this paper, a new design of a single-bit adaptive channel equalization is proposed using sigma... more In this paper, a new design of a single-bit adaptive channel equalization is proposed using sigma delta modulation and a single-bit block Least Mean Square (LMS) algorithm. With correlated narrowband input signals, this model is capable to converge and provide equivalent equalization filter with improvement in the SNR and very low Symbol Error Rate (SER). The input, filter coefficients and output values are all in single-bit and ternary format that results in a reduction in hardware complexity compared to traditional multi-bit channel equalization. Additionally, the technique avoids the need for successive conversion from multi-bit to single bit and back at the receiver and transmitter stages.
β A design technique for a single-bit digital comb filter is presented. The proposed filter respo... more β A design technique for a single-bit digital comb filter is presented. The proposed filter response and performance are assessed in terms of signal-to-quantization-noise ratio (SQNR) and stability. It is found that the comb filter possesses a distinct frequency response in broadband signal applications. The same technique is utilized to design and simulate a single-bit N-period digital resonator. Feedback loop filters can be used to tune the frequency response of the Ξ£ β modulators. The proposed design technique is efficient in hardware implementation. I.
In this paper, a single-bit DC-blocker is presented. It is comprised of a ternary filtering stage... more In this paper, a single-bit DC-blocker is presented. It is comprised of a ternary filtering stage preceded by a sigma-delta modulator. Different techniques are used to generate the ternary taps for hardware and performance optimization. Both the input and the output of this DC-blocker are assumed in single-bit format. The proposed DC-blocker can easily be implemented with FPGA.
Impulsive noise is one of the major challenges in power line communications and can degrade the p... more Impulsive noise is one of the major challenges in power line communications and can degrade the performance of OFDM-based PLC systems significantly. In this paper, we adopt a practically proven channel model for broadband power line communication and utilize it to study and compare the BER performance of three nonlinear time-domain impulsive noise mitigation techniques: clipping, blanking and clipping/blanking. Three noise environments, namely "heavily disturbed", "medium disturbed" and "weakly disturbed", that are based on practical measurements are used to investigate the performance of impulsive noise reduction schemes by means of computer simulations.
... ternary structure,β IEEE TENCON 2006, Accepted, 2006. 7. Amin Z. Sadik and Zahir M. Hussain, ... more ... ternary structure,β IEEE TENCON 2006, Accepted, 2006. 7. Amin Z. Sadik and Zahir M. Hussain, βNew DSP Using Short Word-Length,β International DSP Creative Design Contest (DSPCDC'2006), Southern Taiwan University of Technology (STUT), Ministry of Edu-...
The presence of impulsive noise in any power line channel is typical. In this paper, parameters s... more The presence of impulsive noise in any power line channel is typical. In this paper, parameters such as "interarrival" times are employed for the measurement of different impulsive noise scenarios. BER analysis is performed to compare the performance of the channel for the two types of impulsive noise under three different scenarios, with different number of subcarriers.
Int'l J. of Communications, Network and System Sciences, 2011
Adaptive bit-loading algorithms can improve the performance of OFDM systems significantly. The tr... more Adaptive bit-loading algorithms can improve the performance of OFDM systems significantly. The tradeoff between the performance of the algorithm and its computational complexity is essential for the implementation of loading algorithms. In this paper, we present a low complexity non-iterative discrete bit-loading algorithm to maximize the data rate subject to specified target BER and uniform power allocation. Simulation results show that the proposed algorithm outperforms the equal-BER loading and achieves similar rates to incremental allocation, yet with much lower complexity.
Transmission of a compressed still images using FFT-OFDM over PLC channels with additive white Ga... more Transmission of a compressed still images using FFT-OFDM over PLC channels with additive white Gaussian noise (AWGN) and impulsive noise is tackled. Discrete Wavelet Transform (DWT) is used as one of the compression techniques and it is compared with another compression method, which is Block Truncation Coding (BTC). A comparison between the two methods is carried out in terms of compression factor, and quality of the image. In addition, the effect of multipath on DWT and BTC is studied. Experimental results have showed that BTC method has proven to be more efficient than the DWT method in terms of the above mentioned criteria.
EURASIP Journal on Advances in Signal Processing, 2007
The DC content in single-bit domain is both undesirable and hard to remove. In this paper we prop... more The DC content in single-bit domain is both undesirable and hard to remove. In this paper we propose a single-bit multiplierless DC-blocker structure. The input is assumed to be sigma-delta modulated bitstream. This DC-blocker is designed using a delta modulator topology with a sigma-delta modulator (SDM) embedded in its feedback path. Its performance is investigated in terms of the overall signal-to-noise ratio, the effectiveness of DC removal, and the stability. The proposed structure is efficient for hardware realisation.
Proceedings of the 2008 Australasian Telecommunication Networks and Applications Conference, ATNAC 2008, 2008
The clipping and filtering method is analyzed in terms of power savings. The analysis takes accou... more The clipping and filtering method is analyzed in terms of power savings. The analysis takes account of the gain in the amplifier efficiency due to Peak-to-Average-Power-Ratio (PAPR) reduction. Assuming a linear amplifier and a typical digital signal processor, the power savings is shown to be in the order of Watts.
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Papers by Amin Sadik