This paper proposes an efficient method for transmitting images, video and multimedia information... more This paper proposes an efficient method for transmitting images, video and multimedia information through the RF wireless channel. Using discrete wavelet transform technique, image pixels are transformed into subbands of coefficients, which is then encoded using the proposed algorithm. This is followed by transmitting the signal using multicode spread spectrum code division multiple access (CDMA) communication system. This technique is used because of its high ability to mitigate fading and resist inter-symbol interference. Preliminary results show the possibility of transmitting multimedia information using multicode modulation.
This paper presents the performance analysis of convolutionally coded multicode spread spectrum c... more This paper presents the performance analysis of convolutionally coded multicode spread spectrum code division multiple access (MC-SS/CDMA) system. Two different coders with rates 1/2 and 1/3 were considered. For each encoder, the transfer function is derived and used to compute the average bit error rate (BER). The performance of the coded system is compared to that of the uncoded system. The results indicate a significant improvement in the performance of a MC-CDMA system when channel coding is used.
A family of exponential linear phase FIR filters that can be recursively implemented is proposed ... more A family of exponential linear phase FIR filters that can be recursively implemented is proposed in this work. The advantage of this family is that the hardware implementation requires a fixed number of scalar multiplication and addition/subtraction operations, regardless of the filter order. Part of the arithmetic operations used in the implementation of these filters mandates exact computations, without any truncation or rounding. The paper includes a detailed discussion of the bit-width requirements of these operations. The proposed implementation is described in hardware description language and simulated using ModelSim. The simulation results show that, when done properly, the recursive implementation successfully achieved a linear phase response.
ABSTRACT Signal processing, in general, and signal transforms, in particular, are essential topic... more ABSTRACT Signal processing, in general, and signal transforms, in particular, are essential topics in the curriculum of electrical and/or computer engineering programs. It is very unlikely to come across graduating electrical/computer engineers who are not familiar with Fourier, Laplace, or Z- transforms. However, hardly any of these engineers will be aware of the wavelet transform, let alone being trained to design or implement Wavelet Signal Processing (WSP) systems. Due to the continuously increasing popularity of Wavelets and the significant expansion of their applications, it is becoming necessary for Electrical and Computer Engineering (ECE) programs to expose their students to Wavelets and their applications at the undergraduate level. The main obstacle usually preventing programs from teaching new topics is the fact that their curricula are already too packed to introduce additional classes. Being aware of this fact, we understand that teaching wavelet theory, the underlying mathematics, and the signal processing aspects of wavelets can be a tall order to do at the undergraduate level. We therefore suggest a scheme for teaching application-oriented WSP as part of the advanced Digital Signal Processing (DSP) class, already existing in the curriculum of the ECE program.
ABSTRACT In feedback control system applications, sensor signals, often noisy, must be fed back t... more ABSTRACT In feedback control system applications, sensor signals, often noisy, must be fed back to the controller under tight time constraints. Conventional de-noising methods were developed without considering delay, and are inappropriate for feedback loops. An embedded, short-delay signal de-noising system is suggested in this paper. The system is specifically designed to de-noise the position control signal for a sensorless switched reluctance motor, but can be extended to other applications. The results show that a significant noise reduction is achieved with a latency of 66 ns.
Abstract This work develops an application-aware approach to signal de-noising. The approach co... more Abstract This work develops an application-aware approach to signal de-noising. The approach considers the way in which a signal from a sensor or receiver is processed and used in deciding how best to de-noise the signal. The benefits of the system-wide approach are illustrated ...
This special session is organized to provide an interactive forum for the introduction of a set o... more This special session is organized to provide an interactive forum for the introduction of a set of curriculum modules developed under IEEE's Real World Engineering Projects (RWEP) program. The modules, available to the public via a RWEP web portal, are designed for use in the first-year engineering and computer science classroom, and are hands-on, teambased projects that emphasize the societal impact of the work that engineers do. After a brief introduction to the RWEP program and the curriculum modules, the authors of the modules will present their ideas and demonstrate the laboratory activities associated with their modules in interactive, informal simultaneous sessions.
This paper outlines a methodology for implementing pipelined IIR digital filters that considers b... more This paper outlines a methodology for implementing pipelined IIR digital filters that considers both how much pipelining to use and what fixed-point precisions are required. The methodology is applied to an example second-order IIR filter implemented on a field programmable gate array; the results show that the methodology allows exploration of the trade-offs between hardware size and throughput while ensuring that the implemented filters deliver a consistent quality of output.
This paper proposes an efficient method for transmitting images, video and multimedia information... more This paper proposes an efficient method for transmitting images, video and multimedia information through the RF wireless channel. Using discrete wavelet transform technique, image pixels are transformed into subbands of coefficients, which is then encoded using the proposed algorithm. This is followed by transmitting the signal using multicode spread spectrum code division multiple access (CDMA) communication system. This technique is used because of its high ability to mitigate fading and resist inter-symbol interference. Preliminary results show the possibility of transmitting multimedia information using multicode modulation.
This paper presents the performance analysis of convolutionally coded multicode spread spectrum c... more This paper presents the performance analysis of convolutionally coded multicode spread spectrum code division multiple access (MC-SS/CDMA) system. Two different coders with rates 1/2 and 1/3 were considered. For each encoder, the transfer function is derived and used to compute the average bit error rate (BER). The performance of the coded system is compared to that of the uncoded system. The results indicate a significant improvement in the performance of a MC-CDMA system when channel coding is used.
A family of exponential linear phase FIR filters that can be recursively implemented is proposed ... more A family of exponential linear phase FIR filters that can be recursively implemented is proposed in this work. The advantage of this family is that the hardware implementation requires a fixed number of scalar multiplication and addition/subtraction operations, regardless of the filter order. Part of the arithmetic operations used in the implementation of these filters mandates exact computations, without any truncation or rounding. The paper includes a detailed discussion of the bit-width requirements of these operations. The proposed implementation is described in hardware description language and simulated using ModelSim. The simulation results show that, when done properly, the recursive implementation successfully achieved a linear phase response.
ABSTRACT Signal processing, in general, and signal transforms, in particular, are essential topic... more ABSTRACT Signal processing, in general, and signal transforms, in particular, are essential topics in the curriculum of electrical and/or computer engineering programs. It is very unlikely to come across graduating electrical/computer engineers who are not familiar with Fourier, Laplace, or Z- transforms. However, hardly any of these engineers will be aware of the wavelet transform, let alone being trained to design or implement Wavelet Signal Processing (WSP) systems. Due to the continuously increasing popularity of Wavelets and the significant expansion of their applications, it is becoming necessary for Electrical and Computer Engineering (ECE) programs to expose their students to Wavelets and their applications at the undergraduate level. The main obstacle usually preventing programs from teaching new topics is the fact that their curricula are already too packed to introduce additional classes. Being aware of this fact, we understand that teaching wavelet theory, the underlying mathematics, and the signal processing aspects of wavelets can be a tall order to do at the undergraduate level. We therefore suggest a scheme for teaching application-oriented WSP as part of the advanced Digital Signal Processing (DSP) class, already existing in the curriculum of the ECE program.
ABSTRACT In feedback control system applications, sensor signals, often noisy, must be fed back t... more ABSTRACT In feedback control system applications, sensor signals, often noisy, must be fed back to the controller under tight time constraints. Conventional de-noising methods were developed without considering delay, and are inappropriate for feedback loops. An embedded, short-delay signal de-noising system is suggested in this paper. The system is specifically designed to de-noise the position control signal for a sensorless switched reluctance motor, but can be extended to other applications. The results show that a significant noise reduction is achieved with a latency of 66 ns.
Abstract This work develops an application-aware approach to signal de-noising. The approach co... more Abstract This work develops an application-aware approach to signal de-noising. The approach considers the way in which a signal from a sensor or receiver is processed and used in deciding how best to de-noise the signal. The benefits of the system-wide approach are illustrated ...
This special session is organized to provide an interactive forum for the introduction of a set o... more This special session is organized to provide an interactive forum for the introduction of a set of curriculum modules developed under IEEE's Real World Engineering Projects (RWEP) program. The modules, available to the public via a RWEP web portal, are designed for use in the first-year engineering and computer science classroom, and are hands-on, teambased projects that emphasize the societal impact of the work that engineers do. After a brief introduction to the RWEP program and the curriculum modules, the authors of the modules will present their ideas and demonstrate the laboratory activities associated with their modules in interactive, informal simultaneous sessions.
This paper outlines a methodology for implementing pipelined IIR digital filters that considers b... more This paper outlines a methodology for implementing pipelined IIR digital filters that considers both how much pipelining to use and what fixed-point precisions are required. The methodology is applied to an example second-order IIR filter implemented on a field programmable gate array; the results show that the methodology allows exploration of the trade-offs between hardware size and throughput while ensuring that the implemented filters deliver a consistent quality of output.
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Papers by Sami Khorbotly