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An Efficient Channel Equalization
Technique With A Leaky FLMS Algorithm
G.
Bhanu Chandra and Abhijit Mitra
Department of
Electronics and Communication Engineering,
Indian Institute of
Technology (IIT) Guwahati, India.
E-mail:
(guduru, a.mitra)@iitg.ernet.in.
Abstract:
We propose a modified
version of frequency domain least mean square
algorithm, or, fast least mean square (FLMS)
algorithm that achieves better convergence in
frequency domain with a marginal increment in
implementation Complexity than the former one.
The proposed algorithm, leaky FLMS (LFLMS),
mainly differs from FLMS by virtue
of a leaky factor
which is dependent on the algorithm step size
parameter and improves the convergence behaviour.
We apply the proposed algorithm in case of an
adaptive channel equalizer. The performance of
the proposed algorithm
is examined in the
said application with respect to the mean square
error (MSE) performance as well as bit error
rate (BER) versus
signal to noise ratio (SNR) curves.
Keywords:
Least mean square algorithm, Frequency domain,
Leaky factor, Bit error rate, Mean square error.
pp. 1-4
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Fiber Optic Communication Link
Design
Md. Masud Rana, and Md. Saiful Islam
Department of
Electronics and Communication Engineering
Khulna
University of Engineering and Technology,
Khulna-9203, Bangladesh
E-mail: mamaraece28@yahoo.com and
masudece@ece.kuet.ac.bd
Abstract:
In all-optical networks, traffic is carried
end-to-end in the optical domain, without any
intermediate optical-electrical-optical
conversion. The promise of such networks is the
elimination of a significant amount of
electronic equipment, as well as added
capabilities, such as the ability to transport
any type of data format through the network.
Fiber optic communications has been growing at a
phenomenal pace over the past twenty years, so
rapidly, in fact, that its impact is
increasingly felt in nearly all aspects of
communications technology. The design of such a
system involves many aspects such as the type of
source to be used (LED, LASER), the kind of
fiber to be employed (multimode or single mode),
and the detector (PIN or APD). This work
emphasizes the basic requirements and design
approaches of an optical fiber communication
link. For designing such system the main concern
is the optimization of cost, maximum link length
and stability of performance characteristics.
For a given bit rate, link length and typical
bit error rate, the cost effective design is
chosen here with software implementation.
Key Words: Bit Error Rate (BER),
Light Amplification Stimulated Emission of
Radiation (LASER), Power Budget, Time Budget,
Graded Index (GI) Fiber, and Avalanche Photo
Diode (APD).
pp. 5-12
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An Embedded Network-Engine
Md. Amiruzzaman
College of
Electronics and Information Engineering, School
of Computer Engineering
Sejong
University, Seoul, South Korea
E-mail:
m_amiruzzaman@email.com
Abstract: A new technique of an
embedded network-engine which is working on IEEE
802.11 and 802.16e WLAN environment for Video on
Demand (VoD) is presented in this paper. The
proposed the network-engine with the capability
of controlling the transmission between embedded
client and server over popular wireless
environment has been offered.
Keyword: VOD, Network-engine,
PDA, Socket
pp. 13-19
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Performance Analysis of CELP
Coding with Different Bit Rate Using Gaussian
Codebook for High Quality Speech
Md. Zulfikar Hossain, Sheikh Md. Rabiul Islam
and Khaled Mahbub Morshed
Department of
Electronics and Communication Engineering
Khulna
University of Engineering and Technology,
Khulna-920300
E-mail: sea002.ece@gmail.com,
robi_kuet@yahoo.com,
kmm_ece@yahoo.com
Abstract: This paper is about
the performance analysis of a speech coder and
how speech quality is dependent on excitation
codebook and minimizing the bit-rate while
preserving a certain quality of speech signal,
or to improve speech quality at a certain
moderately bit rate. A Code Excited Linear
Prediction (CELP) procedure is developed to
allow its implementation with Gaussian codebook
and study its Rate vs. SNR characteristics. The
performance of CELP coder is analyzed at
different bit rate as well as for different
codebook size. All of this analysis is performed
by using MATLAB software. Finally a CELP coder
is developed which produce high quality speech
signal at moderately low bit rate.
Keywords: Speech Coding, Linear
Prediction, Autocorrelation, CELP Coder.
pp. 20-23
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Optimization Of Cross Linking
Dyeing Method For Jute Fabric With Reactive Dyes
Md. Kamal Uddin, Md. Elias Molla 1,
S. M. Badier Rahman 2, H M Zakir
Hossain
Pilot Plant and Processing Division
Bangladesh Jute Research Institute, Manik Mia
Avenue, Dhaka1207, Bangladesh
1Department
of Chemistry
Jahangirnagar University, Savar, Dhaka 1342,
Bangladesh
2Department
of Biochemistry and Molecular Biology
Jahangirnagar University, Savar, Dhaka 1342,
Bangladesh.
E-mail:
drkamal_bjri@yahoo.com
Abstract : Jute fabric named Carpet
backing Cloth (CBC), made from jute fiber was
first desized, scoured and bleached with
hydrogen peroxide with a view to developing an
effective dyeing method for jute fabric,.
Simultaneous dyeing and finishing methods were
carried out using reactive dye(Procion Orange
MX2R) with some cross linking agents like
Fixapret CPN, Fixapret ECOs (DMDHEU) of BASF and
Indosol E-50 Powder (Sandoz) along with some
catalysts (MgCl2 6H2O) and
softening agent employing three types of cross
linking methods like dry, moist and wet. The
cross linking method was optimized by treatment
of bleached CBC with different concentrations of
cross linking agents and catalysts applying
pad-dry-cure method at different temperatures
and significant improvement was found in dye
fixation rate, dry crease recovery and tensile
strength of cross linked dyed jute fabric.
Regarding dye fixation rate, dry crease recovery
and tensile strength Indosol E-50 powder along
with various reactive dyes achieved highly
satisfactory results. Fixapret CPN may be
comparable to Indosol E-50 powder.
Keywords: Jute fabric,
Cross-linking method, Cross-linking agent,
Reactive dyes, Fastness Properties.
pp. 24-31
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Multiplication Of Fuzzy Numbers
Using Mathematica
Sanwar Uddin Ahmad1 and Thowhida
Akther2
1Institute
of Natural Sciences
United
International University
2Faculty
of Science and Information Technology
Daffodil
International University
E-mail: sanwardu@gmail.com and lizudu@yahoo.com
Abstract: In this paper a
computer implementation to evaluate the
multiplication of two fuzzy numbers with linear
membership functions has been developed. The
fuzzy arithmetic approached by the interval
arithmetic has been used here. The algorithm of
the developed method with a numerical example
has also been provided.
Analysis reveals that
the membership functions of the product of any
two TFNs can evaluate without complexity.
Keywords: Fuzzy number, Fuzzy
arithmetic, Membership Function, Interval
arithmetic.
pp. 32-35
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Study On The Physico-Mechanical
Properties Of Photocured Jute Fabrics With
2-Hydroxyl
Ethyl Methacrylate (HEMA)
S. C. Mazumdar1,
M. J. Miah2 and Mubarak A. Khan3
1
Ahsanullah University of Science and Technology,
Dhaka
2Daffodil
International University, Dhaka
3Institute
of Nuclear Science and Technology,
Bangladesh Atomic Energy Commission, Dhaka
E-mail: sajalf@yahoo.com
and mmjulhash@daffodilvarsity.edu.bd
Abstract: Jute fabric (hessian
cloth) was grafted with different formulated
solutions of monomer 2-hydroxyl ethyl
methacrylate (HEMA) and aliphatic urethane
diacrylate oligomer M-1200 along with minute
amount (2%) photoinitiator (PI) (Darocur 1116)
under ultraviolet (UV) radiation in order to
improve the physico-mechanical properties.
Polymer loading (%PL), tenacity factor,
elongation factor and modulus factor of the
treated hessian cloth were measured. The
concentration of the monomer (HEMA), radiation
dose, and soaking time were optimized with
respect to mechanical properties such as tensile
strength, elongation factor and modulus factor
of the treated hessian cloth. The 78% HEMA, 20%
M-1200 and 2% PI in 2 minutes soaking time
showed the highest tensile strength at 30th pass
of UV radiation. Then the samples were treated
with optimized formulation for different soaking
times. The optimized formulation in 20 minutes
soaking time showed the best results. Methanol
was added to the optimized formulation as a
swelling agent to reduce the polymer loading and
to improve the mechanical properties. The 40%
optimized formulation in MeOH showed the best
mechanical properties.
Keywords: Jute fabrics, photocuring,
ultraviolate radiation, tenacity factor, modulus
factor.
pp. 36-40
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Compact Dual-Band Dual-Polarized
Microstrip Patch Antenna for Synthetic Aperture
RADAR
Md. Fokhrul
Islam1, M. A. Mohd. Ali1, 2, 3,
B. Yeop Majlis1, 2 and N.
Misran1, 3
1Department
of Electrical, Electronic and Systems
Engineering, Faculty of Engineering
2Institute
of Microengineering and Nanoelectronics (IMEN)
3Institute
of Space Science (ANGKASA)
Universiti Kebangsaan Malaysia, 43600 Bangi,
Selangor, MALAYSIA
E-mail: {fokhrul, mama, burhan, bahiah}@vlsi.eng.ukm.my
Abstract: There is an
increasing demand for newer microwave and
millimeter-wave systems to meet the emerging
telecommunication challenges with respect to
size, performance and cost. Microstrip antennas
offer the advantages of thin profile, light
weight, low cost, ease of fabrication and
compatibility with integrated circuitry. This
paper presents a coaxilly-fed single-layer
compact microstrip patch antenna for
achieving dual-polarized radiation suitable for
applications in the IEEE Radar Band C and X.
Simultaneous use of both frequencies should
dramatically improve data collection and
knowledge of the targets in an airborne
synthetic aperture radar system. The designed
antenna consists of three rectangular patches
which are overlapped along their diagonals. The
design and simulation of the antenna were
performed using 3D full wave electromagnetic
simulator IE3D. The antenna with
a bandwidth of VSWR<2 reaches 154MHz (f0=6.83GHz)
and 209MHz (f0=9.73GHz)
was designed and simulated
successfully.
Keywords: Microstrip antenna, Dual-band,
SAR
pp. 41-45
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Effect of Blending Jute with
Cotton to Produce Fine Yarn in Rotor Spinning
A.K.M.Mahabubuzzaman1, Md. Osman
Ghani Miazi1, Ayub Nabi Khan2,
M. A. Rashid Sarkar3 and A. K.M.
Fazlul Haque4
1Department
of Spinning, Mechanical Processing Division
Bangladesh Jute
Research Institute (BJRI), Manik Mia Avenue,
Dhaka
2Department
of Textile Engineering, Southeast University,
Dhaka
3Department
of Mechanical Engineering
Bangladesh
University of Engineering and Technology (BUET),
Dhaka
4Department
of Yarn Manufacturing
Textile
Institute, Begomganj, Noakhali
E-mail: dr.mahabub@hotmail.com, miazibjri@yahoo.com
and
miazibjri@yahoo.com
Abstract:
Home textiles (furnishing, upholstery) are made
from cotton at present and addition of jute
fibre with cotton would make the raw material
cheaper than that for 100% cotton yarn. Since
jute is an eco-friendly biodegradable cheap
fibre, appropriate products will be made out
from jute with cotton blends yarns. These
products will have a great demand in developed
countries as well as domestic market. Raw and
modified jute was blended with cotton and their
blended yarns were manufactured mainly to take
advantage of value addition and to produce fine
yarn of jute fibre. For spinning jute cotton
blended yarns, jute fibre was mixed with cotton
in a ratio of 30:70. Assessments of the quality
of jute/cotton blend have been made in terms of
their physical properties. Satisfactory spinning
with 30% jute and 70% cotton in blending was
carried out on Rotor spinning machine. The
results have been compared with those of the
100% cotton yarns. The yarns properties made
from jute/ cotton blend in a ratio of 30:70 have
been found nearer to the 100% cotton yarn. We
know jute fibre is cheap in cost with low
strength and discomfort to put on. On the other
hand, cotton fibres are costly with good
strength and comfort to put-on. So our aim of
the project is to produce such type of
Jute/Cotton blended yarn so that over-all yarn
cost will be cheap and to produce improve
quality yarn which will be comfort to put on.
Keywords: Jute, cotton, quality, spinning
and yarn.
pp. 46-50
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Rot-Proofing of Jute Fabrics by
Using
Copper Ammonium Carbonate
Solution
Shamina Jafrin,
Md. Kamal Uddin, F. A. Dilruba, Nayer Sultana
and H.M. Zakir
Hossain
Bangladesh Jute Research Institute, Manik Mia
Avenue, Dhaka1207
E-mail:
sjafrin@gmail.com.
Abstract:
Jute hessian fabrics were treated with copper
ammonium carbonate solution to increase its
longevity. Two types of Hessians (sized and
desized) were treated with various concentration
of copper ammonium carbonate solution. To assess
the effectiveness of copper ammonium carbonate
solution as a rot proofing agent the liquor
ratio, tensile strength, copper content and
longevity of the treated fabrics were
determined. The longevity of the treated jute
fabrics were tested by exposing them to the
environment in contact with wet soil as nursery
pots for seedlings. The treated jute nursery
pots exhibited a maximum longevity of fourteen
months.
Key words:
Rot-proofing,
Copper ammonium carbonate, Jute fabrics,
Longevity, Nursery pot
pp. 51-54
====================================================================
D. M. Nuruzzaman1*,
A. Nakajima2 and T. Mawatari3
1Department
of Mechanical Engineering
Dhaka
University of Engineering and Technology,
Gazipur 1700, Bangladesh
2,3Department
of Mechanical Engineering
Saga
University, 1, Honjo-machi, Saga-shi, Saga
840-8502, Japan.
*E-mail:
dewan052005@yahoo.com
Abstract: In this study,
tribological characteristics and surface
topographies of thermally sprayed WC-Cr-Ni
cermet coating were investigated experimentally
under lubricated rolling with sliding contact
conditions. Hi-HVOF sprayed WC cermet coatings
were deposited onto the axially ground, blasted
and circumferentially ground roller specimens
made of an induction hardened carbon steel. It
was found that under a contact pressure 1.4 GPa,
cermet coating showed a high durability and life
of the coating was not influenced by the
substrate surface finish. It was also found that
coefficient of friction and surface temperature
were hardly affected by the substrate surface
finish. On the other hand, after running,
surface topographical parameters such as
skewness, kurtosis and surface roughness were
significantly influenced depending on the
substrate surface finish. Namely, after the
running-in process, the skewness in the case of
circumferentially ground substrate became much
more negative than that in the case of axially
ground or blasted substrate. In addition,
kurtosis and surface roughness of the coated
surface were much more influenced in the case of
circumferentially ground substrate than that in
the case of axially ground or blasted substrate.
Keywords: Substrate Surface Finish,
Tribological Performance, Surface Topography,
WC-Cr-Ni Cermet
pp. 55-59
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