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circuit-implementation
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Empirical performance evaluation of adaptive routing in necklace hypercubes: a comparative study
, Article International Conference on Computing: Theory and Applications, ICCTA 2007, Kolkata, 5 March 2007 through 7 March 2007 ; 2007 , Pages 193-197 ; 0769527701 (ISBN); 9780769527703 (ISBN) ; Nayebi, A ; Sarbazi Azad, H ; Sharif University of Technology
2007
Abstract
The necklace hypercube network has recently been introduced as an attractive alternative to the well-known hypercube. Previous research on this network topology has mainly focused on topological properties and VLSI aspects of this network. In this paper, we propose some adaptive routing algorithm for the necklace hypercubes. The performance of necklace hypercubes using the proposed routing algorithm is then evaluated by means of simulation experiments. Experiments are realized under different working loads and for different network factors. Moreover, a comparison between the necklace hypercube and the well-known hypercube network is conducted. The comparison has been done considering...
Comments on chaotic characteristics analysis and circuit implementation for a fractional-order system
, Article IEEE Transactions on Circuits and Systems I: Regular Papers ; Volume 62, Issue 1 , 2015 , Pages 329-332 ; 15498328 (ISSN) ; Sharif University of Technology
Abstract
In this note, it is shown that some of the results reported in the above titled paper on the behavior analysis of a fractional order system are not consistent with reality. To support this claim, theoretical justifications and numerical results are presented. Also, it is analytically explained that why such inconsistencies have been occurred in the aforementioned paper
A fast converging integrated implementation of zero-knowledge beamforming algorithm for phased-array receivers
, Article Analog Integrated Circuits and Signal Processing ; 2019 ; 09251030 (ISSN) ; Atarodi, M ; Sharif University of Technology
Springer New York LLC
2019
Abstract
This paper presents a new implementation of adaptive beamforming algorithm that can be fully implemented on chip. It does not require the knowledge of the incoming signal direction or phase shifter characteristics. Besides, it eliminates the need for the ADC to convert the analog output signal to digital values for the microprocessor and the DAC to apply the calculated values to the control voltages of the analog phase shifters. Thus, it exhibits better convergence speed. In addition, the need for the complex and power-hungry processor is eliminated. Therefore, this implementation consumes less power. Analytical equations and constraints on system design parameters are derived, and the...
A fast converging integrated implementation of zero-knowledge beamforming algorithm for phased-array receivers
, Article Analog Integrated Circuits and Signal Processing ; 2019 ; 09251030 (ISSN) ; Atarodi, S. M ; Sharif University of Technology
Springer New York LLC
2019
Abstract
This paper presents a new implementation of adaptive beamforming algorithm that can be fully implemented on chip. It does not require the knowledge of the incoming signal direction or phase shifter characteristics. Besides, it eliminates the need for the ADC to convert the analog output signal to digital values for the microprocessor and the DAC to apply the calculated values to the control voltages of the analog phase shifters. Thus, it exhibits better convergence speed. In addition, the need for the complex and power-hungry processor is eliminated. Therefore, this implementation consumes less power. Analytical equations and constraints on system design parameters are derived, and the...
A fully analog side-band cancellation technique in radio-frequency transmitters
, Article Microelectronics Journal ; Volume 53 , Volume 53 , 2016 , Pages 116-126 ; 00262692 (ISSN) ; Kananian, S ; Hadizadeh, E ; Fotowat Ahmady, A ; Sharif University of Technology
Elsevier Ltd
Abstract
In this paper, a new fully analog technique is proposed by means of which the adverse effects of frequency dependent gain/phase errors in quadrature transmitters are suppressed. Two separate phase and gain mismatch cancellation loops are implemented which search for the minimum side-band component. A new sign detection method is also introduced which makes sure the direction of the loop is correct. Analytical models and mathematical derivations have been presented which corroborates the circuit implementation. A proof of concept prototype using off-the-shelf components have also been measured which suggests 38-dB side-band rejection (SBR). Furthermore, the measured TX EVM and BER are...
A low-power signal-dependent sampling technique: analysis, implementation, and applications
, Article IEEE Transactions on Circuits and Systems I: Regular Papers ; Volume 67, Issue 12 , 2020 , Pages 4334-4347 ; Elmi, M ; Taherinejad, N ; Fotowat Ahmady, A ; Mirabbasi, S ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2020
Abstract
Sensors are among essential building blocks of any Cyber-Physical Systems (CPSs). Acquisition and processing of their sensory data contribute to the power consumption and computation load of the overall CPSs. For data acquisition, the conventional fixed frequency sampling in many such systems is sub-optimal since a sizable number of samples do not contain important information. In this work, we propose a Signal-Dependent Sampling (SDS) method and present its associated circuit implementation. Using the proposed SDS method, the number of retained samples is significantly reduced with little or negligible compromise in the quality of the (reconstructed) signal. The associated error and added...