Shahid Beheshti University

Displaying 1-11 of 11 results

  • White Papers // Oct 2014

    Designing High-Speed, Low-Power Full Adder Cells Based on Carbon Nanotube Technology

    In this paper, the authors present novel high speed and low power full adder cells based on Carbon Nanotube Field Effect Transistor (CNFET). Four full adder cells are proposed in this paper. First one (named CN9P4G) and second one (CN9P8GBUFF) utilizes 13 and 17 CNFETs respectively. Third design that, they...

    Provided By Shahid Beheshti University

  • White Papers // Dec 2011

    A New Full Adder Cell for Molecular Electronics

    Due to high power consumption and difficulties with minimizing the CMOS transistor size, molecular electronics has been introduced as an emerging technology. Further, there have been noticeable advances in fabrication of molecular wires and switches and also molecular diodes can be used for designing different logic circuits. Considering this novel...

    Provided By Shahid Beheshti University

  • White Papers // Sep 2011

    A Proxy e-Raffle Protocol Based on Proxy Signatures

    In 2009, Chang and Cheng proposed an efficient proxy raffle protocol. In their scheme, the raffle tickets are known by participants as well as raffle organizers. Hence, unless the authors implicitly add the unrealistic assumption that the organizer is trustworthy, this may cause problems and threaten the security of the...

    Provided By Shahid Beheshti University

  • White Papers // Nov 2010

    A Two-Phase Constructive Heuristic for Minimum Energy Broadcasting in Wireless Ad Hoc Networks

    Wireless ad hoc networks are usually composed of autonomous nodes, which are powered by batteries only. The energy-efficiency is perhaps one of the most important factors for each operation in terms of networks. Broadcast, for example, is one of the fundamental operations in modern telecom networks. In this paper, a...

    Provided By Shahid Beheshti University

  • White Papers // Jun 2010

    On the Interference Imposed on Primary Transmission in Cognitive Radio Networks

    Cognitive Radio (CR) is an unlicensed data transmission technique with two main objectives: providing highly reliable communications and efficient utilization of the spectrum. The authors focus in this paper on the interference a CR transmission imposes on the primary (licensed) transmission. The amount of this interference is directly related to...

    Provided By Shahid Beheshti University

  • White Papers // Jun 2010

    Improved Spectrum Sensing and Achieved Throughputs in Cognitive Radio Networks

    State of the art spectrum sensing methods evaluate sensing performance only based on correct detection of the presence of the primary user's signal. As a first step, the authors propose a more realistic framework that also takes the correct detection of the absence of primary user's signal into account for...

    Provided By Shahid Beheshti University

  • White Papers // Jun 2010

    Time-Frequency Spectrum Leasing for OFDM-Based Dynamic Spectrum Sharing Systems

    In cognitive radio systems, Dynamic Spectrum Leasing (DSL) can improve the efficiency of spectrum utilization. In DSL, the primary user who has the license for a part of the bandwidth, decides to lease it to a secondary user or not. In this paper, the authors assume an OFDM-based system and...

    Provided By Shahid Beheshti University

  • White Papers // Jun 2010

    Robust Iterative Receiver Design Under Imperfect Channel Estimation

    In a recent contribution, assuming pilot-only based channel estimation, the authors proposed an improved receiver which reduces the impact of channel uncertainty on the decoder performance. Here, they focus on semi-blind channel estimation based on Expectation-Maximization (EM) algorithm and propose an improved receiver design by an appropriate use of the...

    Provided By Shahid Beheshti University

  • White Papers // Jun 2010

    Wideband Spectrum Sensing for Cognitive Radio Via Phase-Field Segmentation

    In this paper, the authors investigate the problem of wide-band spectrum sensing for detecting vacant frequency sub-bands in opportunistic cognitive radio. To this end, they identify the irregularities (discontinuities) in the estimated power spectrum density. More precisely, they propose a new mathematical framework based on phase-field segmentation method, classically used...

    Provided By Shahid Beheshti University

  • White Papers // May 2010

    Recent Developments in Channel Estimation and Detection for MIMO Systems

    It is well known that Multiple-Input Multiple-Output (MIMO) systems can provide very high spectral efficiencies in a rich scattering propagation medium Telatar (1999). They are hence a promising solution for high-speed, spectrally efficient, and reliable wireless communication Raoof et al. (2008) .When coherent signal detection is to be performed at...

    Provided By Shahid Beheshti University

  • White Papers // Mar 2010

    Turbo-Trellis Coded Modulation Under Channel Estimation Inaccuracies

    Turbo-Trellis Coded Modulation (TTCM) schemes are designed for reliable transmission over quasi-static fading channels. Assuming pilot-assisted channel estimation, practical limitations in power and the number of pilots lead to imperfect channel estimates. A general method for robust receiver design under channel estimation errors was recently proposed by Sadough and Duhamel....

    Provided By Shahid Beheshti University

  • White Papers // Jun 2010

    On the Interference Imposed on Primary Transmission in Cognitive Radio Networks

    Cognitive Radio (CR) is an unlicensed data transmission technique with two main objectives: providing highly reliable communications and efficient utilization of the spectrum. The authors focus in this paper on the interference a CR transmission imposes on the primary (licensed) transmission. The amount of this interference is directly related to...

    Provided By Shahid Beheshti University

  • White Papers // Jun 2010

    Improved Spectrum Sensing and Achieved Throughputs in Cognitive Radio Networks

    State of the art spectrum sensing methods evaluate sensing performance only based on correct detection of the presence of the primary user's signal. As a first step, the authors propose a more realistic framework that also takes the correct detection of the absence of primary user's signal into account for...

    Provided By Shahid Beheshti University

  • White Papers // Jun 2010

    Time-Frequency Spectrum Leasing for OFDM-Based Dynamic Spectrum Sharing Systems

    In cognitive radio systems, Dynamic Spectrum Leasing (DSL) can improve the efficiency of spectrum utilization. In DSL, the primary user who has the license for a part of the bandwidth, decides to lease it to a secondary user or not. In this paper, the authors assume an OFDM-based system and...

    Provided By Shahid Beheshti University

  • White Papers // May 2010

    Recent Developments in Channel Estimation and Detection for MIMO Systems

    It is well known that Multiple-Input Multiple-Output (MIMO) systems can provide very high spectral efficiencies in a rich scattering propagation medium Telatar (1999). They are hence a promising solution for high-speed, spectrally efficient, and reliable wireless communication Raoof et al. (2008) .When coherent signal detection is to be performed at...

    Provided By Shahid Beheshti University

  • White Papers // Sep 2011

    A Proxy e-Raffle Protocol Based on Proxy Signatures

    In 2009, Chang and Cheng proposed an efficient proxy raffle protocol. In their scheme, the raffle tickets are known by participants as well as raffle organizers. Hence, unless the authors implicitly add the unrealistic assumption that the organizer is trustworthy, this may cause problems and threaten the security of the...

    Provided By Shahid Beheshti University

  • White Papers // Nov 2010

    A Two-Phase Constructive Heuristic for Minimum Energy Broadcasting in Wireless Ad Hoc Networks

    Wireless ad hoc networks are usually composed of autonomous nodes, which are powered by batteries only. The energy-efficiency is perhaps one of the most important factors for each operation in terms of networks. Broadcast, for example, is one of the fundamental operations in modern telecom networks. In this paper, a...

    Provided By Shahid Beheshti University

  • White Papers // Mar 2010

    Turbo-Trellis Coded Modulation Under Channel Estimation Inaccuracies

    Turbo-Trellis Coded Modulation (TTCM) schemes are designed for reliable transmission over quasi-static fading channels. Assuming pilot-assisted channel estimation, practical limitations in power and the number of pilots lead to imperfect channel estimates. A general method for robust receiver design under channel estimation errors was recently proposed by Sadough and Duhamel....

    Provided By Shahid Beheshti University

  • White Papers // Jun 2010

    Robust Iterative Receiver Design Under Imperfect Channel Estimation

    In a recent contribution, assuming pilot-only based channel estimation, the authors proposed an improved receiver which reduces the impact of channel uncertainty on the decoder performance. Here, they focus on semi-blind channel estimation based on Expectation-Maximization (EM) algorithm and propose an improved receiver design by an appropriate use of the...

    Provided By Shahid Beheshti University

  • White Papers // Jun 2010

    Wideband Spectrum Sensing for Cognitive Radio Via Phase-Field Segmentation

    In this paper, the authors investigate the problem of wide-band spectrum sensing for detecting vacant frequency sub-bands in opportunistic cognitive radio. To this end, they identify the irregularities (discontinuities) in the estimated power spectrum density. More precisely, they propose a new mathematical framework based on phase-field segmentation method, classically used...

    Provided By Shahid Beheshti University

  • White Papers // Oct 2014

    Designing High-Speed, Low-Power Full Adder Cells Based on Carbon Nanotube Technology

    In this paper, the authors present novel high speed and low power full adder cells based on Carbon Nanotube Field Effect Transistor (CNFET). Four full adder cells are proposed in this paper. First one (named CN9P4G) and second one (CN9P8GBUFF) utilizes 13 and 17 CNFETs respectively. Third design that, they...

    Provided By Shahid Beheshti University

  • White Papers // Dec 2011

    A New Full Adder Cell for Molecular Electronics

    Due to high power consumption and difficulties with minimizing the CMOS transistor size, molecular electronics has been introduced as an emerging technology. Further, there have been noticeable advances in fabrication of molecular wires and switches and also molecular diodes can be used for designing different logic circuits. Considering this novel...

    Provided By Shahid Beheshti University