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Papers by Jafar Mohammadi
Due to the high percentage of induction motors in industrial market, there exist a large opportun... more Due to the high percentage of induction motors in industrial market, there exist a large opportunity for energy savings. Replacement of working induction motors with more efficient ones can be an important resource for energy savings. A calculation of energy savings and payback ...
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Iranian Journal of Health and Physical Activity, 2010
... The relationship between sources of sport confidence and athletic performance in young Irania... more ... The relationship between sources of sport confidence and athletic performance in young Iranian elite wrestlers Jafar Abdolalizadeh1*, Hamid Reza Taheri Torbati1, Mahdi Sohrabi1, Jafar Mohammadi1, Amir Tavakolian1 Faculty ...
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Audiology, Jul 15, 2013
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2015 53rd Annual Allerton Conference on Communication, Control, and Computing (Allerton), 2015
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Indian Journal of Science and Technology, 2012
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IET Renewable Power Generation, 2016
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2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2012
ABSTRACT A key to efficient mobile communication networks is an efficient utilization of scarce r... more ABSTRACT A key to efficient mobile communication networks is an efficient utilization of scarce resources, which includes mechanisms for resource allocation and interference management. In practice, time sharing methods such as Time Division Multiple Access (TDMA) are often exploited to create orthogonal connections. TDMA schemes however are inflexible and not suitable for decentralized implementation. In this context, approaches based on concurrent transmissions in the same frequency spectrum admitting the interference offer a promising and attractive alternative. Yet their performances deteriorate dramatically if the underlying interference coefficients are relatively large. Assuming a Gaussian Interference Channel (GIC), this paper characterizes the so-called TDMA region which is defined as a set of all interference coefficient matrices for which TDMA outperforms concurrent transmissions. We use the dimensional lifting method to prove the convexity and monotonicity of the TDMA region, which provides some insights into the scheduling design under uncertainty with respect to the interference coefficients. Finally, the analysis is used to develop strategies for resource allocation in STDMA-based wireless networks.
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IEEE Transactions on Sustainable Energy, 2000
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2015 IEEE International Conference on Communication Workshop (ICCW), 2015
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2012 Conference Record of the Forty Sixth Asilomar Conference on Signals, Systems and Computers (ASILOMAR), 2012
ABSTRACT In this paper we study the scaling laws of achievable secrecy rates for multicast commun... more ABSTRACT In this paper we study the scaling laws of achievable secrecy rates for multicast communication scenarios with a single multiple antenna transmitter and multiple eavesdropper. First we prove bounds on the achievable secrecy rate. Then we use these bounds to analyze the scaling of the system in three asymptotic regimes, 1) increasing the number of legitimate users while keeping the number of eavesdroppers and antennas constant, 2) increasing the number of eavesdroppers for a fixed number of legitimate users and antennas, and 3) increasing the number of transmit antennas with a constant number of users. Next, we derive the probability of outage for some special cases. In the last part, the theoretical analysis is justified by simulations.
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Energy Conversion and Management, 2014
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2011 8th International Symposium on Wireless Communication Systems, 2011
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2013 Asilomar Conference on Signals, Systems and Computers, 2013
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2013 IEEE International Conference on Communications (ICC), 2013
ABSTRACT This paper deals with the challenge of providing information-theoretic secrecy in a two-... more ABSTRACT This paper deals with the challenge of providing information-theoretic secrecy in a two-hop wireless channel with multiple untrusted relay nodes. Instead of perfect secrecy (in the information-theoretic sense), of interest here is a cross-layer approach where only parts of relayed information are protected at the physical layer against eavesdropping at relay nodes. For both decode-and-forward and amplify-and-forward relaying strategies, we present a novel framework for designing secrecy schemes for two-hop relay channels that ensure some predefined level of partial secrecy. The paper is concluded by some numerical simulations to show the interplay between different system parameters such as the the rate, secrecy factor, the number of relays and antennas.
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GLOBECOM - IEEE Global Telecommunications Conference, 2010
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Eurasip Journal on Wireless Communications and Networking, 2013
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Journal of Biological Sciences, Jan 1, 2007
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Journal of New …, Jan 1, 2009
This research was carried out for studying the effect of different plant densities and split appl... more This research was carried out for studying the effect of different plant densities and split application of nitrogen fertilizer on quantitative yield of Brussels sprout Ula De La Halle cultivar in Miyaneh region, Iran. Treatments were arranged as split plot based on randomized complete block ...
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Due to the high percentage of induction motors in industrial market, there exist a large opportun... more Due to the high percentage of induction motors in industrial market, there exist a large opportunity for energy savings. Replacement of working induction motors with more efficient ones can be an important resource for energy savings. A calculation of energy savings and payback ...
Bookmarks Related papers MentionsView impact
Iranian Journal of Health and Physical Activity, 2010
... The relationship between sources of sport confidence and athletic performance in young Irania... more ... The relationship between sources of sport confidence and athletic performance in young Iranian elite wrestlers Jafar Abdolalizadeh1*, Hamid Reza Taheri Torbati1, Mahdi Sohrabi1, Jafar Mohammadi1, Amir Tavakolian1 Faculty ...
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Audiology, Jul 15, 2013
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2015 53rd Annual Allerton Conference on Communication, Control, and Computing (Allerton), 2015
Bookmarks Related papers MentionsView impact
Indian Journal of Science and Technology, 2012
Bookmarks Related papers MentionsView impact
IET Renewable Power Generation, 2016
Bookmarks Related papers MentionsView impact
2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2012
ABSTRACT A key to efficient mobile communication networks is an efficient utilization of scarce r... more ABSTRACT A key to efficient mobile communication networks is an efficient utilization of scarce resources, which includes mechanisms for resource allocation and interference management. In practice, time sharing methods such as Time Division Multiple Access (TDMA) are often exploited to create orthogonal connections. TDMA schemes however are inflexible and not suitable for decentralized implementation. In this context, approaches based on concurrent transmissions in the same frequency spectrum admitting the interference offer a promising and attractive alternative. Yet their performances deteriorate dramatically if the underlying interference coefficients are relatively large. Assuming a Gaussian Interference Channel (GIC), this paper characterizes the so-called TDMA region which is defined as a set of all interference coefficient matrices for which TDMA outperforms concurrent transmissions. We use the dimensional lifting method to prove the convexity and monotonicity of the TDMA region, which provides some insights into the scheduling design under uncertainty with respect to the interference coefficients. Finally, the analysis is used to develop strategies for resource allocation in STDMA-based wireless networks.
Bookmarks Related papers MentionsView impact
IEEE Transactions on Sustainable Energy, 2000
Bookmarks Related papers MentionsView impact
2015 IEEE International Conference on Communication Workshop (ICCW), 2015
Bookmarks Related papers MentionsView impact
2012 Conference Record of the Forty Sixth Asilomar Conference on Signals, Systems and Computers (ASILOMAR), 2012
ABSTRACT In this paper we study the scaling laws of achievable secrecy rates for multicast commun... more ABSTRACT In this paper we study the scaling laws of achievable secrecy rates for multicast communication scenarios with a single multiple antenna transmitter and multiple eavesdropper. First we prove bounds on the achievable secrecy rate. Then we use these bounds to analyze the scaling of the system in three asymptotic regimes, 1) increasing the number of legitimate users while keeping the number of eavesdroppers and antennas constant, 2) increasing the number of eavesdroppers for a fixed number of legitimate users and antennas, and 3) increasing the number of transmit antennas with a constant number of users. Next, we derive the probability of outage for some special cases. In the last part, the theoretical analysis is justified by simulations.
Bookmarks Related papers MentionsView impact
Energy Conversion and Management, 2014
Bookmarks Related papers MentionsView impact
2011 8th International Symposium on Wireless Communication Systems, 2011
Bookmarks Related papers MentionsView impact
2013 Asilomar Conference on Signals, Systems and Computers, 2013
Bookmarks Related papers MentionsView impact
2013 IEEE International Conference on Communications (ICC), 2013
ABSTRACT This paper deals with the challenge of providing information-theoretic secrecy in a two-... more ABSTRACT This paper deals with the challenge of providing information-theoretic secrecy in a two-hop wireless channel with multiple untrusted relay nodes. Instead of perfect secrecy (in the information-theoretic sense), of interest here is a cross-layer approach where only parts of relayed information are protected at the physical layer against eavesdropping at relay nodes. For both decode-and-forward and amplify-and-forward relaying strategies, we present a novel framework for designing secrecy schemes for two-hop relay channels that ensure some predefined level of partial secrecy. The paper is concluded by some numerical simulations to show the interplay between different system parameters such as the the rate, secrecy factor, the number of relays and antennas.
Bookmarks Related papers MentionsView impact
GLOBECOM - IEEE Global Telecommunications Conference, 2010
Bookmarks Related papers MentionsView impact
Eurasip Journal on Wireless Communications and Networking, 2013
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Journal of Biological Sciences, Jan 1, 2007
Bookmarks Related papers MentionsView impact
Journal of New …, Jan 1, 2009
This research was carried out for studying the effect of different plant densities and split appl... more This research was carried out for studying the effect of different plant densities and split application of nitrogen fertilizer on quantitative yield of Brussels sprout Ula De La Halle cultivar in Miyaneh region, Iran. Treatments were arranged as split plot based on randomized complete block ...
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact