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Total 149 records

    Multiple access channel with common message and secrecy constraint

    , Article IET Communications ; Volume 10, Issue 1 , 2016 , Pages 98-110 ; 17518628 (ISSN) Zivari Fard, H ; Akhbari, B ; Ahmadian Attari, M ; Aref, M. R ; Sharif University of Technology
    Institution of Engineering and Technology 
    Abstract
    The authors study the problem of secret communication over a multiple-access channel with a common message. Here, the authors assume that two transmitters have confidential messages, which must be kept secret from the wiretapper (the second receiver), and both of them have access to a common message which can be decoded by the two receivers. The authors call this setting as multiple-access wiretap channel with common message (MAWC-CM). For this setting, the authors derive general inner and outer bounds on the secrecy capacity region for the discrete memoryless case and show that these bounds meet each other for a special case called the switch channel. As well, for a Gaussian version of... 

    Secrecy capacity in large cooperative networks in presence of eavesdroppers with unknown locations

    , Article 2016 Iran Workshop on Communication and Information Theory, IWCIT 2016, 3 May 2016 through 4 May 2016 ; 2016 ; 9781509019229 (ISBN) Hadavi, A. H ; Kazempour, N ; Mirmohseni, M ; Aref, M. R ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2016
    Abstract
    In this paper, an extended large wireless network, with a single transmitter-receiver pair, under the secrecy constraint is considered. In contrast to works which use idealized assumptions, a more realistic network situation with unknown eavesdroppers locations is investigated: the legitimate users only know their own Channel State Information (CSI), not the eavesdroppers CSI. Also, the network is analyzed by taking in to account the effects of both fading and path loss. Under these assumptions, a power efficient cooperative scheme, named stochastic virtual beamforming, is proposed. Applying this scheme, any desired pair of secure rate and outage level denoted by (Rs, ϵ) will be achievable... 

    Joint sum rate and error probability optimization: finite blocklength analysis

    , Article IEEE Wireless Communications Letters ; 2017 ; 21622337 (ISSN) Haghifam, M ; Mili, M. R ; Makki, B ; Nasiri Kenari, M ; Svensson, T ; Sharif University of Technology
    Abstract
    We study the tradeoff between the sum rate and the error probability in downlink of wireless networks. Using the recent results on the achievable rates of finite-length codewords, the problem is cast as a joint optimization of the network sum rate and the per-user error probability. Moreover, we develop an efficient algorithm based on the divide-and-conquer technique to simultaneously maximize the network sum rate and minimize the maximum users’ error probability and to evaluate the effect of the codeword length on the system performance. The results show that, in delay-constrained scenarios, optimizing the per-user error probability plays a key role in achieving high throughput. IEEE  

    Simulation of a channel with another channel

    , Article IEEE Transactions on Information Theory ; Volume 63, Issue 5 , 2017 , Pages 2659-2677 ; 00189448 (ISSN) Haddadpour, F ; Yassaee, M. H ; Beigi, S ; Gohari, A ; Aref, M. R ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2017
    Abstract
    In this paper, we study the problem of simulating a discrete memoryless channel (DMC) from another DMC under an average-case and an exact model. We present several achievability and infeasibility results, with tight characterizations in special cases. In particular, for the exact model, we fully characterize when a binary symmetric channel can be simulated from a binary erasure channel when there is no shared randomness. We also provide infeasibility and achievability results for the simulation of a binary channel from another binary channel in the case of no shared randomness. To do this, we use the properties of Rényi capacity of a given order. We also introduce a notion of 'channel... 

    State-dependent multiple access relay channel with cooperating transmitters

    , Article 2018 Iran Workshop on Communication and Information Theory, IWCIT 2018, 25 April 2018 through 26 April 2018 ; 2018 , Pages 1-6 ; 9781538641491 (ISBN) Gholipour, J ; Mirmohseni, M ; Seyfe, B ; Aref, M. R ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2018
    Abstract
    In this paper, we consider a state-dependent multiple access relay channel (MARC) with two-way cooperation at transmitters, in which the transmitters cooperate with each other over two limited-rate channels. We derive an achievable rate region for this channel by using block-Markov superposition coding, and double binning techniques. In our proposed scheme, the relay decodes only parts of the messages which are shared between the transmitters. © 2018 IEEE  

    Simultaneous partial and backward decoding approach for two-level relay networks

    , Article 2009 IEEE International Symposium on Information Theory, ISIT 2009, Seoul, 28 June 2009 through 3 July 2009 ; 2009 , Pages 517-521 ; 21578102 (ISSN); 9781424443130 (ISBN) Ghabeli, L ; Aref, M. R ; Sharif University of Technology
    2009
    Abstract
    In this paper, we propose a new achievable rate for two-level relay networks by introducing a new strategy named simultaneous partial and backward decoding. In the proposed method, benefitting from regular encoding/backward decoding strategy, different message parts transmitted in the network are simultaneously decoded at the relays and the receiver. The proposed strategy is shown to achieve better rates than the previously proposed methods based on decode-and-forward and partial decode-and-forward. © 2009 IEEE  

    Optimum power allocation in parallel poisson optical channel

    , Article 2009 10th International Conference on Telecommunications, ConTEL 2009, Zagreb, 8 June 2009 through 10 June 2009 ; 2009 , Pages 285-288 ; 9789531841313 (ISBN) Alem Karladani, M. M ; Sepahi, L ; Jazayerifar, M ; Kalbasi, K ; Sharif University of Technology
    2009
    Abstract
    In this paper we investigate the Shannon capacity of single and parallel Poisson channels in different scenarios. At first, by examining the capacity equation of the single Poisson channel, the minimum average power that maximizes the capacity is found. Then, applying the method of Lagrange multipliers on the capacity expression of the parallel Poisson channel, we obtain the optimum power allocation maximizing the parallel Poisson channel capacity  

    Inter-symbol-interference reduction in indoor infrared systems by effective sampling

    , Article Proceedings - 2009 International Conference on Future Computer and Communication, ICFCC 2009, 3 April 2009 through 5 April 2009, Kuala Lumpar ; 2009 , Pages 42-46 ; 9780769535913 (ISBN) Hassanzadeh, M. R ; Mansouri Rad, M. M ; Sharif University of Technology
    2009
    Abstract
    A new and simple receiver structure for reducing the multipath inter-symbole interference (ISI) effect is proposed for infrared diffuse links. In this new method, bit-error rate (BER) performance of the system will be improved significantly without any essential change in the receiver structure. In our analysis, all major noise sources such as ambient light, signal shotnoise, dark current and thermal noise of the receiver are considered. © 2009 IEEE  

    Quantum capacity of a bosonic dephasing channel

    , Article Physical Review A ; Volume 102, Issue 4 , 2020 Arqand, A ; Memarzadeh, L ; Mancini, S ; Sharif University of Technology
    American Physical Society  2020
    Abstract
    We study the quantum capacity of a continuous-variable dephasing channel, which is a notable example of a non-Gaussian quantum channel. We prove that a single-letter formula applies. The optimal input state is found to be diagonal in the Fock basis and with a distribution that is a discrete version of a Gaussian. We discuss how its mean and variance are related to the dephasing rate and input energy. We then show that by increasing the input energy, the capacity saturates to a finite value. We also show that it decays exponentially for large values of dephasing rates. © 2020 American Physical Society  

    Quasi-inversion of qubit channels

    , Article Physical Review A ; Volume 101, Issue 3 , 2020 Karimipour, V ; Benatti, F ; Floreanini, R ; Sharif University of Technology
    American Physical Society  2020
    Abstract
    In general quantum operations, or quantum channels cannot be inverted by physical operations, i.e., by completely positive trace-preserving maps. An arbitrary state passing through a quantum channel loses its fidelity with the input. Given a quantum channel E, we discuss the concept of its quasi-inverse as a completely positive trace-preserving map Eqi which when composed with E increases its average input-output fidelity in an optimal way. The channel Eqi comes as close as possible to the inverse of a quantum channel. We give a complete classification of such maps for qubit channels and provide quite a few illustrative examples. © 2020 American Physical Society  

    Capacity of a more general class of relay channels

    , Article 2008 International Symposium on Information Theory and its Applications, ISITA2008, Auckland, 7 December 2008 through 10 December 2008 ; April , 2008 ; 9781424420698 (ISBN) Abed Hodtani, G ; Aref, M. R ; Commemorative Organization for the Japan World; Exposition('70); Support Center for Advanced Telecommunications; Technology Research; REFEC Research Foundation for the; Electrotechnology of Chubu ; Sharif University of Technology
    2008
    Abstract
    Capacity has been found for degraded, reversely degraded, full feedback, semi-deterministic, orthogonal relay channels, also for a class of deterministic relay channels and a class of modulo sum relay channels. We indicate what the relay decodes and forwards with one auxiliary random variable having bounded cardinality and attempt to define a more general class of relay channels in order to unify most of known capacity theorems into one capacity theorem by considering additional assumptions imposed to the definition of those channels. In other words, the relay channel inputs are dependent as in multiple access channel with arbitrarily correlated sources and here we do for the relay channel... 

    A new routing algorithm for irregular mesh NoCs

    , Article 2008 International SoC Design Conference, ISOCC 2008, Busan, 24 November 2008 through 25 November 2008 ; Volume 1 , 2008 , Pages I260-I264 ; 9781424425990 (ISBN) Samadi Bokharaei, V ; Shamaei, A ; Sarbaziazad, H ; Abbaspour, M ; Sharif University of Technology
    2008
    Abstract
    Network-on-Chips (NoCs) usually use regular mesh-based topologies.Regular mesh topologies are not always efficient because of power and area constraints which should be considered in designing system-on-chips.To overcome this problem,irregular mesh NoCs are used for which the design of routing algorithms is an important issue.This paper presents a novel routing algorithm for irregular mesh-based NoCs called "i-route". In contrast to other routing algorithms,this algorithm can be implemented on any arbitrary irregular mesh NoC without any change in the place of IPs. In this algorithm, messages are routed using only 2 classes of virtual channels. Simulation results show that using only 2... 

    Performance analysis of transmitter-side cooperation-receiver-side-relaying schemes for heterogeneous sensor networks

    , Article IEEE Transactions on Vehicular Technology ; Volume 57, Issue 3 , 2008 , Pages 1548-1563 ; 00189545 (ISSN) Jamshidi, A ; Nasiri Kenari, M ; Sharif University of Technology
    2008
    Abstract
    In this paper, we present two physical layer cooperative protocols for heterogeneous sensor networks. There is one cooperator near the transmitter and a second cooperator (as a relay) near the receiver. Although the focus is on heterogeneous sensor networks, the methods can be applied to homogeneous sensor networks as well. Analytical and simulation results show that, under an additive white Gaussian noise channel assumption for the links between the transmitter and its partner and between the receiver and its partner, the proposed protocols achieve a diversity order of three or four by using the amplify-and-forward cooperation strategy and maximal ratio combining in the receiver. In... 

    Error resilient source coding for video communication

    , Article 2007 IEEE 15th Signal Processing and Communications Applications, SIU, Eskisehir, 11 June 2007 through 13 June 2007 ; 2007 ; 1424407192 (ISBN); 9781424407194 (ISBN) Ajorloo, H ; Lakdashti, A ; Manzuri Shalmani, M. T ; Sharif University of Technology
    2007
    Abstract
    A novel error resilient source coding method is proposed for video codecs such as H.264 standard. The main idea is to develop an error resilient part similar to the channel coders at the source coder. This enables the receiver to recover a damaged slice of a frame, inter or intra coded, up to a certain size determined by the encoder. In contrast to another previously approach presented in the literature, our algorithm has significantly less artifacts on the video frames with a considerable increase in speed  

    Transition of d -level quantum systems through quantum channels with correlated noise

    , Article Physical Review A - Atomic, Molecular, and Optical Physics ; Volume 75, Issue 4 , 2007 ; 10502947 (ISSN) Fahmi, A ; Golshani, M ; Sharif University of Technology
    2007
    Abstract
    Entanglement and entanglement assisted are useful resources to enhance the mutual information of the Pauli channels, when the noise on consecutive uses of the channel has some partial correlations. In this paper, we study quantum-communication channels in d -dimensional systems and derive the mutual information of the quantum channels for maximally entangled states and product states coding with correlated noise. Then, we compare fidelity between these states. Our results show that there exists a certain fidelity memory threshold, which depends on the dimension of the Hilbert space (d) and the properties of noisy channels. We calculate the classical capacity of a particular correlated noisy... 

    Performance comparison of partially adaptive routing algorithms

    , Article 20th International Conference on Advanced Information Networking and Applications, Vienna, 18 April 2006 through 20 April 2006 ; Volume 2 , 2006 , Pages 763-767 ; 1550445X (ISSN) ; 0769524664 (ISBN); 9780769524665 (ISBN) Patooghy, A ; Sarbazi Azad, H ; Sharif University of Technology
    2006
    Abstract
    Partially adaptive routing algorithms are a useful category of routing algorithms due to their simple router logic and restricted adaptivity in selecting the next output channel towards the destination. Several partially adaptive routing algorithms on mesh and hypercube networks have been presented in the literature. But there is no study on evaluating the performance of these algorithms. This paper tries to compare the most important partially adaptive routing algorithms on the mesh and hypercube networks as the most popular topologies for multicomputers. The evaluation has been performed by the use of event driven simulator coded by C++ compiler. © 2006 IEEE  

    The impacts of timing constraints on virtual channels multiplexing in interconnect networks

    , Article 25th IEEE International Performance, Computing, and Communications Conference, 2006, IPCCC 2006, Phoenix, AZ, 10 April 2006 through 12 April 2006 ; Volume 2006 , 2006 , Pages 55-62 ; 1424401976 (ISBN); 9781424401970 (ISBN) Khonsari, A ; Ould Khaoua, M ; Nayebi, A ; Sarbazi azad, H ; Sharif University of Technology
    2006
    Abstract
    Interconnect networks employing wormhole-switching play a critical role in shared memory multiprocessor systems-on-chip (MPSoC) designs, Multicomputer systems and System Area Networks. Virtual channels greatly improve the performance of wormhole-switched networks because they reduce blocking by acting as "bypass" lanes for non-blocked messages. Capturing the effects of virtual channel multiplexing has always been a crucial issue for any analytical model proposed for wormhole-switched networks. Dally [8] has developed a model to investigate the behaviour of this multiplexing which have been widely employed in the subsequent analytical models of most routing algorithms suggested in the... 

    Estimation error minimization in sensor networks with mobile agents

    , Article 2006 3rd IEEE Consumer Communications and Networking Conference, CCNC 2006, Las Vegas, NV, 8 January 2006 through 10 January 2006 ; Volume 2 , 2006 , Pages 964-968 ; 1424400856 (ISBN); 9781424400850 (ISBN) Ghiassi Farrokhfal, Y ; Arbab, V. R ; Pakravan, M. R ; Sharif University of Technology
    2006
    Abstract
    In a SEnsor Network with Mobile Agents (SENMA) is an architecture proposed for large scale sensor networks. In sensor networks, a fraction of the packets generated by only part of the sensors is sufficient to provide a good estimation of all network information. SENMA uses this inherent redundancy. However, the performance of such system is limited by estimation errors and packet errors due to collision. Estimation error is a major problem in applications such as habitat monitoring in which information is a function of node position. In this paper, we first derive the equations of distortion in a general scenario and use this model to compare the estimation error for regular networks. Then... 

    Transition behavior in the capacity of correlated noisy channels in arbitrary dimensions

    , Article Physical Review A - Atomic, Molecular, and Optical Physics ; Volume 74, Issue 3 , 2006 ; 10502947 (ISSN) Karimipour, V ; Memarzadeh, L ; Sharif University of Technology
    2006
    Abstract
    We construct a class of quantum channels in arbitrary dimensions for which entanglement improves the performance of the channel. The channels have correlated noise and when the level of correlation passes a critical value we see a sharp transition in the optimal input states (states which minimize the output entropy) from separable to maximally entangled states. We show that for a subclass of channels with some extra conditions, including the examples which we consider, the states which minimize the output entropy are the ones which maximize the mutual information. © 2006 The American Physical Society  

    Analytic modeling of channel traffic in n-cubes

    , Article 1st International Computer Science Symposium in Russia, CSR 2006, St. Petersburg, 8 June 2006 through 12 June 2006 ; Volume 3967 LNCS , 2006 , Pages 567-579 ; 03029743 (ISSN) Sarbazi Azad, H ; Mahini, H ; Patooghy, A ; Sharif University of Technology
    Springer Verlag  2006
    Abstract
    Many studies have shown that the imbalance of network channel traffic is of critical effect on the overall performance of multicomputer systems. In this paper, we analytically model the traffic rate crossing the network channels of a hypercube network under different working conditions. The effect of different parameters on the shaping of non-uniformity and traffic imbalance over network channels, are considered and analytical models for each case are proposed. © Springer-Verlag Berlin Heidelberg 2006