Ali Alaeddine

Teaching microprocessors, microcontrollers, and digital signal processing courses using only one target processor: The newborn dsPIC30F™ from Microchip™

As the technology of electrical and computer engineering (E&CE) grows, undergraduate programs are under constant pressure to keep content up‐to‐date within a 4‐year context of a fixed number of credits hours allowed for graduation. Teaching Microprocessors, Microcontrollers and Digital Signal Processing using only one target processor (dsPIC30F™) can save many credit hours and efforts. The newborn dsPIC30F from Microchip is a microcontroller with digital signal processing power and a new Harvard architecture. In addition, the same processor can be easily used in lab experiments, final year projects and research works.

Pulse shape pre-distortion for improving the power efficiency of SOA-based IR-UWB over fiber systems

With the view to achieve a reach extension, the use of a Semiconductor Optical Amplifier (SOA) is investigated here for Impulse Radio Ultra Wide Band (IR-UWB) over fiber systems. Due to the nonlinear effects occurring when the amplifier operates in its saturated region, designing pulse shapes appears to be challenging for such systems. By calibrating the key parameters of some Gaussian pulses based on the photo-detected spectrum, and by considering a highly accurate SOA model, we show that a significant power efficiency improvement can be achieved. In particular, it is demonstrated that an efficiency greater than 50% can be reached with Abrahas linear sum of modified doublets, while operating at a strongly saturated point (0 dBm input power). Moreover, we examine the benefits of the proposed pre-distortion scheme in presence of 1.6 Gbps-OOK and 0.8 Gbps-PPM modulation formats, significant performance gains being obtained over a large transmission distance.

Study of the effects of signal filtering on acousto-optic correlator performance

The performance of acousto-optic correlators (AOC) in spread-spectrum receivers is considered. The received pseudorandom sequences are correlated with reference ones in an acousto-optic cell. In particular, the effects of receiver filtering on the AOC processing gain are analyzed in the presence of additive white Gaussian noise (AWGN). The signal processing method is presented. For ideal AOCs, simple analytical expressions are derived for two different types of receiver filters: ideal and RC first-order filters. The results are given in terms of the ratio β of the code rate to the filter bandwidth. They show approximate processing gain losses of 4 dB for the first type and 1 dB for the second type for β=5. For real AOCs, the results are obtained from numerical simulation.

A novel ultra high speed and configurable discrete wavelet packet transform architecture

This work is dedicated to present a new architecture of Discrete Wavelet Packet Transform (DWPT) implemented in FPGA using a parallel direct FIR () filter. The main target of our architecture is to provide an effective performance trade-off, where it significantly increases the throughput with a restricted amount of hardware. It is smartly connect based on low-pass and high-pass filters in the Mallat-tree algorithm by a clever sharing of the hardware resources. This architecture is fully configurable in synthesis according to parallel degree, the tree depth (number of tree levels), the order of the filters and the filter quantization coefficient. Consequently, the simulation results accelerated to an approximate value of P∗(Frequency). Furthermore, the tree depth and filters order has little impact (only due to place and route variations) on throughput. This architecture was synthesized using Altera Quartus prime lite edition targeting an Altera Cyclone IV — (FPGA) and it was developed in VHDL at RTL level modeling.

All-Optical Radiofrequency Sampling Mixer Based on a Semiconductor Optical Amplifier Mach–Zehnder Interferometer Using a Standard and a Differential Configuration

An all-optical sampling based on a semiconductor optical amplifier Mach-Zehnder interferometer is performed. The frequency properties of a sampled signal are exploited to obtain both frequency up-conversion and frequency down-conversion of quadrature phase shift keying (QPSK) data. An optical pulse source, generating 10-ps-width pulses at a repetition rate of 7.8 GHz used as a sampling signal, allows operation in the range of 0.5-39.5 GHz. The conversion gain of the all-optical sampling mixer is measured over the whole frequency range. It varies over this range from 20.4 to 0 dB for frequency down-conversion and from 15.5 to -13.4 dB for frequency up-conversion. QPSK data at symbol rates between 8 and 128 MSymb/s are frequency converted. The Error Vector Magnitude is used to evaluate the quality of the frequency conversion. Exploitable error vector magnitudes (EVMs) in the range of 14% to 27.4% are reached for frequency up-conversion to the higher target frequency for all the symbol rates. For down-conversion, the EVM varies from 6.7% to 29.2% at the symbol rate of 64 MSymb/s for the whole frequency range. By using a differential configuration, the conversion gain is improved by 8.6 and 9 dB for up-conversion and down-conversion operations, respectively. The benefit provided by the differential configuration leads to a better EVM. Its value is shifted by almost 11% for frequency up-conversion and frequency down-conversion of data at a symbol rate of 64 MSymb/s.

Up and down frequency conversion of a QPSK signal by an all-optical radiofrequency sampling mixer based on a semiconductor optical amplifier Mach-Zehnder interferometer

An all-optical sampling mixer based on a Semiconductor Optical Amplifier Mach-Zehnder Interferometer is performed. The frequency properties of a sampled signal are exploited to obtain both up and down frequency conversion of QPSK data. The optical pulse source, generating 10-ps width pulses at the repetition rate of 7.8 GHz as a sampling signal, allows operation in the 0.5-39.5 GHz range. The conversion gain of the all-optical sampling mixer is measured over all the frequency range. It varies over this range from 20.4 to 0 dB for frequency down-conversion and from 15.5 to -13.4 dB for frequency up-conversion. QPSK data at symbol rates between 8 MSymb/s to 128 MSymb/s are frequency converted. The Error Vector Magnitude is used to evaluate the quality of the frequency conversion. Exploitable EVMs in the range 14 to 27.4% are reached for up-conversion operation to the higher frequency for all the symbol rates. For down-conversion the EVM varies from 6.7 to 29.2% at the symbol rate of 64 MSymb/s for all the frequency range.

Digital image stabilization for video images

The problem of image stabilization in videos is important in many applications, including cameras mounted on vehicles. There are various approaches used for stabilizing the captured videos. This paper explains the subject of digital image stabilization (DIS) and the different steps associated with it. Then three robust DIS techniques are enhanced and developed to stably remove the unwanted shaking phenomena in the image sequences and videos. These methods are the gray-coded bit-plane matching algorithm, feature-based matching algorithm, and target tracking algorithm which is tested as a real-time product.

On optimizing the operating conditions of a Mach-Zehnder modulator for IR-UWB over fiber transmission

The power efficiency of a 2 Gbps OOK-based Impulse Radio-over-Fiber (RoF) system based on 5th-derivative Gaussian and Abrahas pulse is studied in this paper, with the aim of optimizing the Mach-Zehnder Modulator (MZM) setup. The best peak-to-peak (p-p) voltage is computed for several fiber lengths up to 40 Km. It is shown that adapting the p-p voltage with distance, with a trade-off between MZM output power and linearity while respecting FCC spectral constraints, can improve the system performance.

Two cascaded SOAs used as intensity modulators for adaptively modulated optical OFDM signals in optical access networks

Detailed theoretical and numerical investigations of the transmission performance of adaptively modulated optical orthogonal frequency division multiplexed (AMOOFDM) signals are undertaken, for the first time, in optical amplification and chromatic dispersion (CD) compensation free single mode fiber (SMF) intensity-modulated and direct-detection (IMDD) systems using two cascaded semiconductor optical amplifiers in a counterpropagating configuration as an intensity modulator (TC-SOA-CC-IM). A theoretical model describing the characteristics of this configuration is developed. Extensive performance comparisons are also made between the TC-SOA-CC and the single SOA intensity modulators. It is shown that, the TC-SOA-CC reaches its strongly saturated region using a lower input optical power much faster than the single SOA resulting in significantly reduced effective carrier lifetime and thus wide TC-SOA-CC bandwidths. It is shown that at low input optical power, we can increase the signal line rate almost 115% which will be more than twice the transmission performance offered by single SOA. In addition, the TC-SOA-CC-IM is capable of supporting signal line rates higher than corresponding to the SOA-IM by using 10dB lower input optical powers. For long transmission distance, the TC-SOA-CC-IM has much stronger CD compensation capability compared to the SOA-IM. In addition the use of TC-SOA-CC-IM is more effective regarding the capability to benefit from the CD compensation for shorter distances starting at 60km SMF, whilst for the SOA-IM starting at 90km.

MULTI-LEVEL CODING AND MULTI-STAGE DECODING FOR MODULATIONS WITH HEXAGONAL CONSTELLATION

This research theme is the impact of the proactive transfer of motor learning between handball and basketball; carry out of the first year of secondary school pupils (15-17 years) of high school IdrisSenouci of Mostaganem city (Algeria). This study aimed to show the existence of a reciprocal proactive transfer of motor learning in the subsequent practice between handball and basketball in the direction of basketball to handball. For this, I hypothesized that there is a reciprocal proactive transfer motor learning engine between handball and basketball in favour of the sense of basketball to handball. To realize this study, I selected a systematic sample of 184 pupils’ boys and girls representing 36.44% of the population retort on four groups, two experimental and two controls to compare their results. And in order to measure the impact of reciprocal proactive transfer of motor learning between handball and basketball, I have conceived an experience based on the experimental protocol of Schmidt (1975) which compares between the performances of an experimental group to those of the control group. Thus, and after analyzing the results of the experiment, it is proved that the proactive transfer of motor learning was embodied in the sense of basketball to handball depending on three statistical means that are the T Students, the percentage of development, and the transfer index of Murdock.