2017
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SumRate Maximization Based on Power Constraints for Cooperative AF Relay Networks
2
2
In this paper, our objective is maximizing total sumrate subject to power constraints on total relay transmit power or individual relay powers, for amplifyandforward singleantenna relaybased wireless communication networks. We derive a closedform solution for the total power constraint optimization problem and show that the individual relay power constraints optimization problem is a quadratic programming which does not have a closedform solution. To solve it, we propose a closedform and lowcomplex technique which introduces suboptimal solution as an upper bound of system sumrate. The performance of two new proposed algorithms are evaluated in terms of average achievable sumrate and energy efficiency in different signal to noise ratios (SNRs). Considering the effect of the number of relays, the effect of channel gains of the sourcerelay as well as the relaydestination, and also the impact of the level of imperfect CSI are investigated. According to simulation results, higher sumrate can be achieved in total power constrained scenario for all SNRs but energy efficiency is approximately the same for both of them. In addition, higher sumrate is achievable by increasing the number of relays and/or improving the quality of uplink and downlink channels as well as decreasing uncertainty of channels.
1

1
25


Shahriar
Shirvani Moghaddam
shahid rajaei
shahid rajaei
Iran
sh_shirvani@sru.ac.ir


Maryam
Alibeigi
DCSP Research Lab., Shahid Rajaee Teacher Training University (SRTTU), Lavizan, 1678815811, Tehran, Iran
DCSP Research Lab., Shahid Rajaee Teacher
Iran
maryam.alibeigi@gmail.com
Cooperative
MIMO relay network
AF relay
Beamforming
Power control
Sumrate
ClosedForm Solutions for BroadBand Equivalent Circuit of Vertical Rod Buried in Lossy Grounds Subjected to Lightning Strokes
2
2
Abstract— In this paper, input impedance of a vertical rod under lightning stroke is first computed by applying the method of moments (MoM) on the Maxwell’s equations. The circuit model is then achieved through applying modified vector fitting (MVF) on the computed input impedance. After then the equivalent circuit is again extracted for a few values of soil conductivity and rod radius. Finally using a new fuzzybased model namely spatial membership functions, closed form solutions for all lumped elements of the equivalent circuit are achieved. Index Terms— Closedform, lossy ground, lightning stroke, vertical rod, MVF. Index Terms— Closedform, lossy ground, lightning stroke, vertical rod, MVF.
1

26
38


Saeed Reza
Ostadzadeh
Arak university
Arak university
Iran
sostadzadeh@araku.ac.ir


Seyyed Mahdiar
Taghavi
Arak University
Arak University
Iran
,taghavi.sm90@yahoo.com


Mohsen
Kazemi
Imam Khomeini Oil Refinery Company of Shazand, Arak, Iran
Imam Khomeini Oil Refinery Company of Shazand,
Iran
kazemi_elec@yahoo.com


Ali
Bagheri
Arak University
Arak University
Iran
ali.bag@gmail.com
vertical rod
modified vector fitting
spatial membership function
Miniaturized HighPass Filter Based on Balanced Composite RightLeft Handed Transmission Line Using Meander Spiral Complementary Split Ring Resonators
2
2
In this paper, a compact highpass filter (HPF) with a sharp rejection response based on the balanced composite rightleft handed (CRLH) transmission line (TL) concept is proposed. A series LC resonator using an interdigital capacitor and meander lines is designed. Also, a meander spiral complementary split ring resonator (MSCSRR) is used to realize the parallel LC resonator. The highpass filter is implemented in microstrip technology by etching MSCSRR, in the ground plane, and series interdigital capacitor with meander lines, in the signal strip. Because of a smaller electrical size of the proposed MSCSRR and also by using meander lines instead of conventional transmission lines, the total physical dimension of the proposed highpass filter has been reduced. A detailed analysis of the structure, based on the equivalent circuit model is provided. The structure exhibits a balanced CRLH behavior and by properly tuning the geometry of the elements, a highpass response with a sharp transition band is obtained. To validate the design concept, the proposed highpass filter has been fabricated and tested. Experimental verification is provided and a good agreement has been found between the simulation and measurement results. To our knowledge, the size of proposed HPF is more compact in comparison with known similar filters.
1

39
52


Esmail
Zarezadeh
KhatamalAnbia University, Tehran
KhatamalAnbia University, Tehran
Iran
zarezadeh@aut.ac.ir


Hossein
Fathabadi
KhatamalAnbia University, Tehran
KhatamalAnbia University, Tehran
Iran
h.fathabadi@gmail.com


mostafa
danaeian
ValiEAsr University of Rafsanjan, Kerman
ValiEAsr University of Rafsanjan, Kerman
Iran
m.danaeian@gmail.com
metamaterial
balanced composite rightleft handed transmission line (CRLH TL)
meander
meander spiral complementary split ring resonator (MSCSRR)
highpass filter (HPF)
and compact size
A Deterministic Multiple Key Space Scheme for Wireless Sensor Networks via Combinatorial Designs
2
2
The establishing of a pairwise key between two nodes for encryption in a wireless sensor network is a challenging issue. To do this, we propose a new deterministic key predistribution scheme which has modified the multiple key space scheme (MKSS). In the MKSS, the authors define two random parameters to make better resilience than existing schemes. Instead of a random selection of these parameters, our proposal provides a combinatorial framework by substituting appropriate parameters to satisfy certain properties. We show that the proposed scheme enhances storage memory and improves performance or security by carefully choosing a combinatorial design. In addition, we propose a new key agreement mechanism by using derivative operation on univariate polynomials to aim a desired computational overhead. In this case, the computational overhead of our approach lower than the general case of the MKSS’s. If we choose the primitive element in our general formula as the special case of the MKSS, this new process has the same computational overhead as the MKSS.
1

53
70


Ibrahim
Qasemzadeh Kolagar
Department of Mathematics and Computer Science, Shahed University, Tehran, Iran
Department of Mathematics and Computer Science,
Iran
qasemzadehkolagar@gmail.com


hamid
haj seyyed javadi
Department of Mathematics and Computer Science, Shahed University, Tehran, Iran
Department of Mathematics and Computer Science,
Iran
h.s.javadi@shahed.ac.ir


Shahriar
Bijani
Department of Mathematics and Computer Science, Shahed University, Tehran, Iran
Department of Mathematics and Computer Science,
Iran
bijani@shahed.ac.ir
Combinatorial design theory
Key predistribution
security
Wireless Sensor Networks
New UWB Shielding with Frequency Selective Surfaces
2
2
In this paper a Frequency Selective Surface (FSS) as a UWB electromagnetic shield is introduced. The proposed FSS comprises a quasiJ.CJerusalem Cross and a copper ring, which are located at both sides of a FR4 substrate and can represent a S.E Shielding Effectiveness better than 20dB in 90% bandwidth of Ultra Wide Band frequency. This structure is compact and thin. Each cell comprises J.C elements and a ring at two sides of a FR4 board with 3.2mm thickness, dielectric constant of 4.4, and loss tangent of 0.02. The structure has a 24×36 elements with dimensions of 288×432mm. Also the simulation and measurement results are in good agreement.
1

71
80


Mojtaba
Mighani
Shahid Sattari Aeronautical University of Science and Technology
Shahid Sattari Aeronautical University of
Iran
mojtaba.mighani@gmail.com


Alireza
Mallahzadeh
Department of Electrical Engineering, Shahed University
Department of Electrical Engineering, Shahed
Iran
mallahzadeh@shahed.ac.ir
FSS
Shielding Effectiveness
UWB
AttackAware Cooperative Spectrum Sensing in Cognitive Radio Networks under Byzantine Attack
2
2
Cooperative Spectrum Sensing (CSS) is an effective approach to overcome the impact of multipath fading and shadowing issues. The reliability of CSS can be severely degraded under Byzantine attack, which may be caused by either malfunctioning sensing terminals or malicious nodes. Almost, the previous studies have not analyzed and considered the attack in their models. The present study introduces a new issue named attackaware CSS where the objective is to analyze the occurred attack against CR ad hoc network to ameliorate the performance of data fusion schemes. The novelty includes the modification of Weighted Sequential Probability Ratio Test (WSPRT) algorithm which resulted in AttackAware WSPRT (A2WSPRT). The findings indicated considerable reduction in cooperation overhead and enhancement in correct sensing ratio, especially in severe attacks.
1

81
98


Hamed
Alizadeh
Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
Faculty of Electrical and Computer Engineering,
Iran
hag@tabrizu.ac.ir


Abbas Ali
Sharifi
Department of Electrical Engineering, University of Bonab, Bonab, Iran
Department of Electrical Engineering, University
Iran
sharifi@bonabu.ac.ir


Mir Javad
Musevi Niya
Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
Faculty of Electrical and Computer Engineering,
Iran
hamed_elc@yahoo.com


Hadi
Seyedarabi
Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
Faculty of Electrical and Computer Engineering,
Iran
seyedarabi@tabrizu.ac.ir
AttackAware
Byzantine attack
Cognitive Radio (CR)
Cooperative Spectrum Sensing (CSS)
SSDF Attack