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Design Ultra wideband system
Ref. 36/11204360, File No. 35/IRQ/D33
1,2
Laith Awda Kadhim (Postdoctoral in (ICT), SEECS, CRP uOttawa)
1
Al-Khwarizmi College of Engineering, Mechatronics Engineering Department, University of Baghdad,
Iraq, [email protected]
2
Photonic Technology Lab (PTLab), Centre for Research in Photonics, University of Ottawa, Canada,
[email protected]
Address:
1343 MEADOWLANDS DR E APT 1012, NEPEAN, ON, K2E 7E8, CANADA
Mobile: +16137120105
Abstract
The bandwidth – distance product is a key of merit of lightwave systems. To increase the
capacity of lightwave systems, increase in data – rate per channel and tighter channel spacing in dense
wavelight division multiplexed (DWDM) system are the possible solutions. In next-generation lightwave
systems, a 40Gb/s and higher data-rate (DWDM) system is inevitable. In such high speed DWDM
systems, Linear and nonlinear impairments become worse. These linear impairments include chromatic
dispersion (CD) and polarization mode dispersion (PMD) ; nonlinear impairments include self – phase
modulation (SPM),cross phase modulation (XPM) and four wave mixing (FWM).
To minimize both the linear and the nonlinear impairments over the transmission fiber, an optimal
modulation format is needed. A modulation format with a narrow optical spectrum can unique spectral
efficiency and to late more (CD) distortion. A modulation format with constant optical power can be less
susceptible to SPM and XPM; modulation format with multiple signal levels will carry more information
than binary signals and its longer symbol duration will reduce the distortion induced CD and PMD. In
addition , in long-haul networks, amplified spontaneous-emission (ASE) noise produced by erbiumdoped fiber amplifier (EDFAs) is another factor that requires modulation formats more tolerant to
additive ASE noise.
The proposed is to investigate the performance of advanced modulation formats, specifically modified
duo binary, return-to-zero (MD-RZ) modulation scheme and its long-haul reperterless transmission over
standard signal mode fiber (SMF). We focused to phase modulation formats link differential phase shift
keying (DPSK) and differential quadrate phase shift keying (DQPSK),specifically free spectral rang (FSR)
optimizations and wavelength offset to learner in direct detection of these phase modulated systems.
Transmission of duo binary modulated signals over of duo binary modulated signals over(SMF) has
attracted significant attenuation due to a modulated of factors including high tolerance to chromatic
dispersion (CD), ease of implementation, and improved spectral efficiency.
The cost effective technique to generate a modified duobinary return-to-zero (MD-RZ) signal. This
technique employs only one dual arm Mach-Zehender (MZ) modulator. In advanced optical modulation
formats for long-haul optical networks. We covered both intensity and phase modulated system. The
demonstrated effective method to generate MD-RZ signals by using only one signal push-pull type
Mach-Zehnder modulator. The duty cycle of the MD-RZ signal can be adjust changing the time delay of
the two-arm driven electrical signals. The generated (MD-RZ) signal show high receiver sensitivity
relative to (MD-RZ) signals.
We are repetless transmission becomes very important for inaccessible terrestrial and sub-marine
optical networks because drives the signal channel repetless transmission transmission over 300km
SMF-28 with power penalty of 2.7dB.WDM repeatless transmission of eight (MD-RZ) equally spaced
channels at 100GHz over 240Km SMF-28 is also presented with power penalty of 2.4dB. These advanced
modulation schemes will other key technologies, like low noise optical amplifier, new advanced optical
fibers and forward error correction techniques, are crucial to realize high spectral efficient , high –
capacity optical transport networks.
Project achieved during the Postdoctoral position:
1. Performance Improvement of Telephone and Mobile Channels Equalizer
Abstract
While transmitting digital data at a relatively high rate over a particular band limited channel, it is
necessary to employ an equalizer at the receiver in order to correct the signal distortion introduced by the
channel. Inter symbol interference (ISI) leads to large error probability if it is not suppressed. The
possible solution for reducing ISI effect is to use an equalization technique. Maximum Likelihood
Sequence Estimation (MLSE) implemented with Viterbi algorithm applies optimal equalizer for this ISI
problem which minimizes the error rate. This estimator involves a very considerable amount of
equipment complexity especially when detecting a multilevel digital signal having large alphabet, and/or
operating under a channel with long impulse response. This in turn leads to a need to develop detection
algorithms with reduced complexity without affecting the performance. The aim of this exercise is to
study the various ways to remove the ISI, concentrating on the decision-based algorithms (DFE, MLSE,
and near MLSE), analyzing the difference between them from both performance and complexity point of
view. The proposed nonlinear equalizer with perturbation algorithm has improved the system
performance and reduced the computational complexity relative to the standard model. The signal to
noise ratio of the proposed model outperforms the standard one in terms of symbol error rate. This
research will serve humanity by offering models with reduced complexity that will lead to decrease the
cost of practical implementation for such model. This is combined with improved system performance.
The humanitarian impact of this work will results in helping people with hearing difficulties to receive a
clearer voice signal with minimal distortion.
2. Effect of Tilt Angle Orientation on Photovoltaic Module Performance
Abstract
The performance of a photovoltaic (PV) solar module is affected by its tilt angle and orientation with
respect to the horizontal plane. PV systems are among the most important renewable energy sources that
can satisfy the world’s energy requirements. In this study, the effect of tilt angle (azimuth and elevation)
on PV performance was simulated. The simulation involves a PV module tilted at 0°, 15°, 30°, 45°, and
60° (in both x and y directions). The values of the current, voltage, and power were measured at these
positions. Optimum positions were determined as positions in which the maximum values for solar power
were obtained. Simulation results were extracted using the solar module tester, which provides a constant
irradiance of 1000 W/m2. As such, real results were produced, unlike when sun radiation was used and
which fluctuated during testing time. Finally, a tilt impact factor was suggested for evaluating the effect
of tilting the PV panel on output power.
3. 16/64QAM Modulation Technique for Free Space Optical Communication System
Abstract
A Novel 1.12 Tbps dense wave length division multiplexing system for coherent optical 16-level
quadrature amplitude modulation (QAM) free-space optical communication is proposed. The system is a
line-of-sight configuration and uses coherent optical 16QAM technique. The system consists of 4channels, with bit-rate of 280-Gbps/channel and adjacent channel spacing of 200GHz. The system is
analyzed for 16/64 QAM and for single/double polarization multiplexing technique. The performance of
the proposed system is analyzed in terms of bit-error rate, optical signal to noise ratio, scattering diagram
etc. For an input power level of 10 dBm and employing coherent optical DP-16QAM modulation
technique, the coverage distance observed is 1150 km.
4. Indoor Distributed Antenna System for the University of Baghdad Building
Abstract
In-building solutions as investigated and implemented in this paper is a way to enable efficient usage of
wireless mobile applications within different kinds of structures. This requires that sufficient coverage
and capacity with good radio quality to be available inside the buildings. Although the mobile operators
will cover most buildings from outdoor sites in their macro network, there is a need to provide many
buildings with extended radio coverage and capacity. In-building solutions are well-proven methods for
an operator to capture new traffic and new revenue streams. There are several different ways to
implement in-building solutions. Dedicated radio base stations (RBSs) that are connected to distributed
antenna systems (DASs) are commonly implemented solutions. These solutions provide additional
capacity as well as cover all area inside different kinds of buildings. A number of different types of both
RBSs and DASs are available and the solutions can be customized for different buildings and needs. In
this paper, a new model for improving the performance of indoor distributed antenna systems is proposed
and analyzed using passive DAS for the university of Baghdad building. In order to reduce the overall
cost, the proposed designed Passive system use ½” RF cable, Omni antenna, panel antenna, splitters and
Couplers. The proposed model assumed a “worst case scenario” for the location of the equipment room
(Balcony of the 7th floor) which is also used for maintenance.