Loading...
Search for:
transmitter-and-receiver
0.004 seconds
When is it possible to simulate a DMC channel from another?
, Article 2013 IEEE Information Theory Workshop, ITW 2013 ; Sept , 2013 , Page(s): 1 - 5 ; 9781479913237 (ISBN) ; Yassaee, M. H ; Aref, M. R ; Gohari, A
2013
Abstract
In this paper, we study the problem of simulating a DMC channel from another DMC channel. We assume that the input to the channel we are simulating is i.i.d. and that the transmitter and receivers are provided with common randomness at limited rates. We prove bounds for simulating point-to-point, MAC and broadcast channels. As a special case, we recover the achievability part of the result of Cuff for point-to-point channel simulation via a noiseless link and shared randomness
On AVCs with quadratic constraints
, Article IEEE International Symposium on Information Theory - Proceedings, Istanbul ; July , 2013 , Pages 271-275 ; 21578095 (ISSN); 9781479904464 (ISBN) ; Siavoshani, M. J ; Bakshi, M ; Jaggi, S ; IEEE; IEEE Information Theory Society ; Sharif University of Technology
2013
Abstract
In this work we study an Arbitrarily Varying Chanel (VC) with quadratic power constraints on the transmitter and a so-called 'oblivious' jammer (along with additional AWGN) under a maximum probability of error criterion, and no private randomness between the transmitter and the receiver. This is in contrast to similar AVC models under the average probability of error criterion considered in [1], [2], and models wherein common randomness is allowed [3] - these distinctions are important in some communication scenarios outlined below. We consider the regime where the jammer's power constraint is smaller than the transmitter's power constraint (in the other regime it is known no positive rate...
Multiuser orthogonal signal division multiplexing for doubly-selective fading channel in autonomous vehicular communications
, Article 1st International Conference for Students on Applied Engineering, ICSAE 2016, 20 October 2016 through 21 October 2016 ; 2017 , Pages 323-327 ; 9781467390538 (ISBN) ; Dehghani Soltani, M ; Azami, H ; Mashhadi, S ; Al-Shibaany Z. Y. A ; Hameed A. F ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2017
Abstract
Communication networks with highly mobile users are emerging rapidly. Autonomous vehicular communication is an interesting example of such systems. High mobility speed causes drastic change in channel states, and consequently a doubly selective fading scenario is a proper model for such channels. In this paper, by considering this proper model, we introduce a multiuser system based on orthogonal signal division multiplexing in a cognitive radio scenario. Carrier interferometry codes are also utilized in this system. By designing the transmitter and receiver, the performance of such system is investigated. We show that this system works properly when users are moving rapidly, and moreover the...
Design and Fabrication of Ultrasonic Level-meter System
, M.Sc. Thesis Sharif University of Technology ; Nejat Pishkenari, Hossein (Supervisor) ; Salarieh, Hassan (Co-Supervisor)
Abstract
In many industries, including oil and gas industries, power plants, refineries, petrochemicals, steel and cement industries, industrial complexes and consumer industries, there are tanks for storing materials. It is necessary to measure level of products while they are stored in tanks of different sizes. Ultrasonic is one of the non-contact and accurate measurement technologies that can provide a suitable solution for liquid tank monitoring. The purpose of this thesis is to design and build the electronic parts (transmitter and receiver circuits) of an ultrasonic system that is capable of detecting levels at a distance of less than 5 meters with an accuracy of 0.5 % full scale. In this...
Adaptive level control to improve QoS in OCDMA local area networks
, Article 2013 21st Iranian Conference on Electrical Engineering ; May , 2013 , Page(s): 1 - 5 ; 9781467356343 (ISBN) ; Pakravan, M. R ; Sharif University of Technology
2013
Abstract
In this paper, we propose a new method for creating more distinguishable QoS levels in OCDMA networks. The key idea behind the proposed scheme is to adaptively control the transmit power level in each chip based on OCDMA channel state. The structure of the transmitter and receiver are proposed. We provide performance analysis of the recommended scheme and show that it can reduce the system BER and provide better QoS differentiation in a multiclass network. We provide simulation results and demonstrate that they have a good match with the results obtained from mathematical analysis
Analysing of binary PAM systems in digital communication
, Article International Conference on Communication Technology Proceedings, ICCT ; 2012 , Pages 1240-1246 ; 9781467321013 (ISBN) ; Bastani, M. H ; Sharif University of Technology
2012
Abstract
In this era of digital communication systems, different factors are included in efficiency of a transceiver system. Binary PAM systems are one of these transceiver systems. Many aspects of such a system has been considered yet but this field needs more research on because this is the base of any communication system. In this paper, effects of transmitter and receiver filters, noise, duty-cycle and time mismatch between transmitter and receiver in a binary baseband PAM transceiver system is analyzed. Simulation is performed to analyze the above effects on a typical communication system with 10 bits of transmit. MATLAB software is being employed for simulations
MIMO localization by illuminators of opportunity
, Article Proceedings of 2011 IEEE CIE International Conference on Radar, RADAR 2011, 24 October 2011 through 27 October 2011 ; Volume 1 , October , 2011 , Pages 112-115 ; 9781424484416 (ISBN) ; Karbasi, S. M ; Nayebi, M. M ; Sharif University of Technology
2011
Abstract
Passive localization using MIMO techniques has attracted much attention recently. In such schemes, using multiple antennas at transmitter and receiver sides provides spatial diversity without need for identifiable transmitters. On the other hand, one of the problems facing such approach arises when transmitters of a single frequency network (SFN) are used as non-cooperative transmitters and resolving the signals of multiple transmitters reflected from multiple targets is not trivial at receiver side. Therefore, in order to obtain the diversity gain of MIMO localization schemes, it is necessary to develop a technique to assign each echo arriving at the receiver to a given transmitter. In this...
Diversity gain in MIMO passive coherent location
, Article International Radar Symposium, IRS 2011 - Proceedings, 7 September 2011 through 9 September 2011 ; September , 2011 , Pages 841-848 ; 9783927535282 (ISBN) ; Karbasi, S. M ; Nayebi, M. M ; Sharif University of Technology
2011
Abstract
MIMO (Mulitple Input Multiple Output) localization has attracted much attention recently. In such schemes, using multiple antennas at transmitter and receiver sides provides spatial diversity. On the other hand, Passive Coherent Location (PCL) by using the illuminators of opportunity (such as FM, GSM, DVB transmitters) has shown a number of advantages. In this paper, we explore the possibility of achieving diversity gain by using multiple non-cooperative transmitters. In earlier works on MIMO localization, cooperative transmitters were assumed, so that orthogonality between transmitted waveforms could be granted. However, such orthogonality condition is not assumed in the case of PCL...
Backhaul need for speed: 60 GHz is the solution
, Article IEEE Wireless Communications ; Volume 22, Issue 6 , 2015 , Pages 114-121 ; 15361284 (ISSN) ; Fakharzadeh, M ; Choi, S ; Sharif University of Technology
Abstract
The availability of 7-9 GHz of unlicensed spectrum at 60 GHz, advances in low-cost silicon technology, and high interference rejection due to atmospheric loss make 60 GHz an ideal solution for future 4G/5G small-cell backhaul links, where multi-gigabit rates are required. In this article, we review the 60 GHz propagation properties, the practical technology limits, and the regulatory and regional environmental impacts to present a framework for the 60 GHz backhaul link design that translates the link requirements to the essential transmitter and receiver system parameters. This approach includes a preliminary design that generates the input data set for an optimization problem. Two physical...
A periodic jump-based rendezvous algorithm in cognitive radio networks
, Article Computer Communications ; Volume 79, 1 , April , 2016 , Pages 66–77 ; 01403664 (ISSN) ; Pakravan, M. R ; Sharif University of Technology
Elsevier
2016
Abstract
An important issue in designing multichannel MAC protocols for Opportunistic Spectrum Access (OSA) is the synchronization between Secondary Users (SUs). Synchronization can be performed in two phases: the initial handshaking, and then the synchronous hopping across available channels. In this paper, we address the problem of initial handshaking through the approach called "blind rendezvous". We first introduce a role-based solution by constructing two channel hopping sequences. The secondary transmitter and receiver jump across channels according to these two sequences. The proposed algorithm guarantees rendezvous in at most (C+1)2 time slots (where C is the number of channels) and two SUs...
Achievable rate region for broadcast-relay networks with two cooperative relays
, Article IET Communications ; Volume 4, Issue 6 , May , 2010 , Pages 946-955 ; 17518628 (ISSN) ; Ghabeli, L ; Aref, M. R ; Sharif University of Technology
2010
Abstract
The authors consider the problem of broadcast-relay-networks with two cooperative relays. There are a transmitter, two relays and two receivers in the network. The message of the transmitter intended to the receivers has common and private parts. The relays fully cooperate with each other and with the transmitter to send the common part of the message, whereas the private parts of the message are sent through the direct links between the transmitter and receivers. The authors found an achievable rate region for this network by using the symmetric relaying strategy. In this strategy, each relay completely decodes the message of other relay. In the proof the authors took advantage of regular...
An adaptive iterative thresholding algorithm for distributed MIMO radars
, Article IEEE Transactions on Aerospace and Electronic Systems ; 16 July , 2018 , Page(s): 523 - 533 ; 00189251 (ISSN) ; Azghani, M ; Marvasti, F ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
In this paper, a Block Iterative Method with Adaptive Thresholding for Sparse Recovery (BIMATSR) is proposed to recover the received signal in an under-sampled distributed MIMO radar. The BIMATSR scheme induces block sparsity with the aid of a signal-dependent thresholding operator which increases the accuracy of the target parameter estimation task. We have proved that under some sufficient conditions, the suggested scheme converges to a stable solution. Moreover, different simulation scenarios confirm that the BIMATSR algorithm outperforms its counterparts in terms of the target parameter estimation. This superiority is achieved at the expense of slightly more computational complexity. It...
An adaptive iterative thresholding algorithm for distributed mimo radars
, Article IEEE Transactions on Aerospace and Electronic Systems ; Volume 55, Issue 2 , 2019 , Pages 523-533 ; 00189251 (ISSN) ; Azghani, M ; Marvasti, F ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
In this paper, a Block Iterative Method with Adaptive Thresholding for Sparse Recovery (BIMATSR) is proposed to recover the received signal in an under-sampled distributed multiple-input multiple-output radar. The BIMATSR scheme induces block sparsity with the aid of a signal-dependent thresholding operator which increases the accuracy of the target parameter estimation task. We have proved that under some sufficient conditions, the suggested scheme converges to a stable solution. Moreover, different simulation scenarios confirm that the BIMATSR algorithm outperforms its counterparts in terms of the target parameter estimation. This superiority is achieved at the expense of slightly more...
An equivalent electrical circuit design for pipeline corrosion monitoring based on piezoelectric elements
, Article Journal of Mechanical Science and Technology ; Volume 27, Issue 3 , March , 2013 , Pages 799-804 ; 1738494X (ISSN) ; Zabihollah, A ; Khayyat, A. A. A ; Pour, M. O. M ; Sharif University of Technology
2013
Abstract
Underground pipelines are important infrastructure for transporting energy resources, particularly water and oil. Due to the high risk of damage and possible consequences, close monitoring of pipelines is a serious challenge for researchers and decision makers. Piezoelectric sensors/actuators are being used to monitor the physical characteristics of pipelines, including corrosion and crack. Piezoelectric ceramics as transmitters and/or receivers are connected to data concentrators in order to monitor the defects in pipelines. The performance and accuracy of this system highly depends on the accurate interpretation of the received electrical signals due to changing mechanical fields. However,...
MIMO PCL in a single frequency network
, Article 2011 Microwaves, Radar and Remote Sensing Symposium, MRRS-2011 - Proceedings, 25 August 2011 through 27 August 2011 ; August , 2011 , Pages 280-283 ; 9781424496440 (ISBN) ; Karbasi, S. M ; Khalaj, B. H ; Nayebi, M. M ; Sharif University of Technology
2011
Abstract
Passive localization using MIMO techniques has attracted much attention recently. In such schemes, using multiple antennas at transmitter and receiver sides provides spatial diversity without need for identifiable transmitters. On the other hand, one of the problems facing such approach arises when transmitters of a single frequency network (SFN) are used as non-cooperative transmitters and resolving the signals of multiple transmitters reflected from multiple targets is not trivial at receiver side. Therefore, in order to obtain the diversity gain of MIMO localization schemes, it is necessary to develop a technique to assign each echo arriving at the receiver to a given transmitter. In this...
Cache-Aided combination networks with interference
, Article IEEE Transactions on Wireless Communications ; Volume 19, Issue 1 , 2020 , Pages 148-161 ; Motahari, A. S ; Nafie, M ; Gunduz, D ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2020
Abstract
Centralized coded caching and delivery is studied for a radio access combination network (RACN), whereby a set of H edge nodes (ENs), connected to a cloud server via orthogonal fronthaul links with limited capacity, serve a total of K user equipments (UEs) over wireless links. The cloud server is assumed to hold a library of N files, each of size F bits; and each user, equipped with a cache of size μ R N F bits, is connected to a distinct set of r ENs each of which equipped with a cache of size μTNF bits, where μT , μ R in [{0,1}] are the fractional cache capacities of the UEs and the ENs, respectively. The objective is to minimize the normalized delivery time (NDT), which refers to the...
An experimental platform for macro-scale fluidic medium molecular communication
, Article IEEE Transactions on Molecular, Biological, and Multi-Scale Communications ; 2020 ; Nasiri Kenari, M ; Rouzegar, S. V ; Azizi, A ; Hosseinian, A ; Farahnak Ghazani, M ; Bagheri, N ; Mirmohseni, M ; Arjmandi, H ; Mosayebi, R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2020
Abstract
The macro-scale molecular communication (MC) recently received considerable attention because of its potential applications. Since most of the experimental research in MC focuses on the micro-scale cases, it is necessary to study and implement experiments to investigate the concept’s feasibility as well as to validate the models and parameters. In this paper, a macro-scale flow-based MC platform with fluidic medium is developed, in a semi-cylindrical channel with laminar flow condition. The transmission medium we consider is water in the plexi pipe, a transmitter releases Hydrochloric acid molecules into this pipe and a chemical sensor is used as the receiver. We propose an LTI model for the...