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Backpass Trees for Modifying PathFinder-based Routing Algorithm for FPGA

Backpass Trees for Modifying PathFinder-based Routing Algori...

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2022 IEEE International Multi-Conference on Engineering, Computer and Information Sciences, SIBIRCON 2022

作者： Chistiakov, Alexander Y. Zapletina, Mariya A. Gavrilov, Sergey V. Institute for Design Problems in Microelectronics of RAS CAD Department Zelenograd Russia Institute for Design Problems in Microelectronics of RAS Administration Department Zelenograd Russia

ISBN: (纸本)9781665464802

In the field-programmable gate array and programmable system-on-a-chip design flow routing is a highly time-consuming stage that provides the last opportunity to make any design optimizations. Therefore, reducing its runtime with no significant losses in a quality of result occurs to be an extremely important problem to solve. This paper proposes a modification of a PathFinder-based algorithm to implement a directed search technique which contributes FPGA routing acceleration. The main idea is to direct the searching process by routing graph connectivity consideration in a form of backpass trees. The modification is relevant for the situation when there are no geometric coordinates known for FPGA/PSoC routing resources. The modified algorithm was tested on IWLS'2005 and some commercial benchmark sets. The obtained experimental results demonstrate an average runtime reduction by 10% while the average critical path delay and wirelength slightly increase (1.8% and 0.3% respectively) caused by usage of the introduced backpass trees structures. © 2022 IEEE.

关键词： Integrated circuit design

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Improving Reliability-driven Resynthesis with Better Initial Structure

Improving Reliability-driven Resynthesis with Better Initial...

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2022 Conference of Russian Young Researchers in Electrical and Electronic Engineering, ElConRus 2022

作者： Stempkovsky, Alexander L. Telpukhov, Dmitry V. Nadolenko, Vladislav V. Institute for Design Problems in Microelectronics of Ras Moscow Russia

ISBN: (纸本)9781665409933

This paper presents a synthesis algorithm for combinational logic circuits in a given technology basis aimed at reliability optimization. Input data for the algorithm is a circuit in AIG format and a standard cell library, the output is Verilog description of the synthesized circuit. Several metrics based on logical masking probabilities are discussed providing different levels of precision for the cost of different amount of technology information ranging from none to reliability-oriented characterization results. The proposed algorithm is based on the classical tree covering algorithm adapted to optimize reliability characteristics. Signal propagation paths through inverting and non-inverting outputs of each tree are considered separately to give the algorithm more options while keeping cost function computation fast and accurate. The algorithm was tested on circuits from ISCAS'85 benchmark converted to AIGs via the ABC tool. Synthesized circuits were then given as an input to the reliability-driven resynthesis algorithm in order to further improve their fault tolerance. The final results were compared to those of the same resynthesis algorithm given ABC's covering as an input. © 2022 IEEE.

关键词： Logic Synthesis

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Room Frequency Response Equalization Using Modified X-Filtered Adaptive Algorithms

Room Frequency Response Equalization Using Modified X-Filter...

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2022 International Siberian Conference on Control and Communications, SIBCON 2022

作者： Djigan, Victor Institute for Design Problems in Microelectronics of RAS Moscow Russia

ISBN: (纸本)9781665476287

This article presents a technology of the acoustic frequency response equalization. It is based on the usage of the modified x-filtered adaptive algorithms in the equalizers. Comparing to the traditional x-filtered algorithms, the modified ones allow to accelerate the equalizer convergence if the computationally simple LMS or the NLMS adaptive algorithms based on the gradient search strategy are used for the equalizer weights computation. Besides, the modification allows to use the computationally complex but simultaneously efficient RLS adaptive algorithms in the x-filtered mode because the algorithms cannot be used in the traditional x-filtered mode. The proposed equalizer architectures and the computational procedures of the traditional and modified adaptive filtering algorithms are presented. Simulation demonstrates a better performance of the modified algorithms comparing to the traditional ones in the following terms: the equalized frequency response ripple value, the proximity of the PSD curves of the undistorted speech signal and the signal passed through the equalizer and acoustic medium, the initial duration of the transient response of the error signal and the response steady-state value. © 2022 IEEE.

关键词： Adaptive filters

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Espresso-like Iterative Algorithm for Three-Level Logic Minimization

Espresso-like Iterative Algorithm for Three-Level Logic Mini...

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2023 Seminar on Networks, Circuits and Systems, NCS 2023

作者： Stempkovsky, Alexander L. Telpukhov, Dmitry V. Nadolenko, Vladislav V. Institute for Design Problems in Microelectronics of RAS Moscow Russia

ISBN: (纸本)9798350370386

Minimization is an important part of any logic synthesis algorithm. Espresso algorithm can be used as a first step for global two-level minimization. Then factorization is performed to obtain multi-level structure and various local optimization algorithms are applied. This paper presents a new algorithm called Xpresso to replace Espresso in described synthesis flow. It works with three-level logic circuit structure in a form of DNF with an extra layer of XORs. Such structure allows more compact representation than pure DNF while keeping global minimization feasible. Proposed minimization algorithm consists of three iterative Espresso-like steps: expand, irredundant and reduce, tweaked to work with three-level structure. Computational complexity stays mostly at original Espresso's level with most expensive part of expand being transferred to GPU. Experimental results are provided for combinational logic circuits from LGSynth'91 benchmark. Xpresso's outputs are compared to those of Espresso by operation count and a few other metrics. © 2023 IEEE.

关键词： Logic Synthesis

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The Acceleration Techniques for the Modified Pathfinder Routing Algorithm on an Island-Style FPGA

The Acceleration Techniques for the Modified Pathfinder Rout...

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2022 Conference of Russian Young Researchers in Electrical and Electronic Engineering, ElConRus 2022

作者： Zapletina, Mariya A. Zheleznikov, Daniil A. Institute for Design Problems in Microelectronics of Ras Electronic Design Automation Department Moscow Russia

ISBN: (纸本)9781665409933

The paper presents two techniques to speed up routing of user circuits within an island-style FPGA design flow. The basic algorithm is the modified Pathfinder that supports a mixed route graph representation of FPGA routing resources. The first technique reduces the number of rip-up and reroute iterations and allows decreasing routing time by 38% on average while increasing the critical path delay up to 10% only. The second technique utilizes the idea of directed pathfinding on a mixed route graph with known geometric coordinates of its vertices and edges. Various values of directed path search adjustment factor were investigated and the optimal one was discovered. The introduced routing method adjusted by an optimal factor value is shown to double a routing speedup without routability degradation. Also, the paper proposes a formal description of FPGA routing resources and a routing task itself. © 2022 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Signal Source Angular Location Tracking Algorithm 26

Signal Source Angular Location Tracking Algorithm

引用

26th International Conference on Digital Signal Processing and its Applications, DSPA 2024

作者： Djigan, Victor I. Institute for Design Problems in Microelectronics of Ras Department of Integrated Circuits Design Methodology Moscow Russia

ISBN: (纸本)9798350361728

This paper presents an algorithm of the signal source angular location tracking. The tracking is carried out by means of an antenna array. Traditional angular tracking is based on the usage of a monopulse (sum and difference) architecture which combines the output signals of the directional antennas (with mechanical or electronic steering). This requires the usage of a few antennas and a combiner of the antenna output signals. The algorithm, presented in this paper, allows to find the signal source angular location using only one directional antenna that is the antenna array. It is assumed the usage of the antenna array with the digital beamforming. However, the analog phased array can be used as well. This is because the algorithm is based on the processing of the antenna array output signal estimates after the changing (perturbations) only the phases of the array channel signals. This changing can be done by means of the phased shifters in a phased array or by means of the complex-valued weights with the unity absolute values in an antenna array with the digital beamforming. The paper considers the usage of the algorithm in a linear antenna array. To improve the signal-to-noise ratio, the array output samples are processed by a correlator or a matched filter. For this reason, the measured signal must be a pseudo noise sequence. The paper describes the proposed algorithm and the simulation results that confirm the algorithm's operation and demonstrate its efficiency. © 2024 IEEE.

关键词： Beamforming

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Adaptive Antenna Array, Shared with Adaptive Equalizer : Invited Paper

Adaptive Antenna Array, Shared with Adaptive Equalizer : Inv...

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2020 IEEE Ukrainian Microwave Week, UkrMW 2020

作者： Djigan, Victor Institute for Design Problems in Microelectronics of Ras Department of Integrated Circuits Design Methodology Moscow Russia

ISBN: (纸本)9781728173139

This paper considers an Adaptive Antenna Array (AAA), which weights are shared with those of a Feed-Forward (FF) part of the channel equalizer and the array output signal is combined with that of the Feed-Backward (FB) part of the equalizer. The array and this distributed equalizer operate as an indivisible adaptive filter, providing a good performance and an ability to receive a multipath data signal in the presence of external interference sources. The architecture of the array/equalizer and mathematical description of the Recursive Least Mean Squares (RLS), Least Mean Square (LMS) and Normalized LMS (NLMS) algorithms for weights calculation of the adaptive filter are presented. The simulation results demonstrate the efficiency of the proposed solution. © 2020 IEEE.

关键词： Equalizers

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Fast RLS algorithms in Combined Adaptive Array and Fractionally-Spaced Feed-Forward/Feed-Backward Equalizer

Fast RLS algorithms in Combined Adaptive Array and Fractiona...

引用

2020 IEEE East-West design and Test Symposium, EWDTS 2020

作者： Djigan, Victor Institute for Design Problems in Microelectronics of Ras Department of Integrated Circuits Design Methodology Moscow Russia

ISBN: (数字)9781728198996

ISBN: (纸本)9781728198996

This paper considers the usage of the fast Recursive Least Squares (RLS) adaptive filtering algorithms for the weights calculation in the combined adaptive unit, which consists of an antenna array and a channel equalizer. The weights of the fractionally-spaced Feed-Forward (FF) filter of the equalizer are split and used simultaneously as the antenna array weights. The array output signal is combined with that of the Feed-Backward (FB) filter of the equalizer. Because the FF filter operates at the up-sampled rate and the FB filter of the equalizer operates at the symbol rate, the multichannel fast RLS algorithms cannot be used in the considered adaptive unit directly. It is proposed to use a polyphase representation of the FF filter to solve this problem. In this case, the architecture of the adaptive unit is presented as a multichannel adaptive filter with unequal number of weights in channels. The paper considers the architecture of the adaptive unit and the details of its FF part. The mathematical details of the multichannel fast RLS algorithm (Fast Kalman, FK), used for the adaptive unit weights calculation, are presented. The simulation of the array/equalizer demonstrates the ability of the proposed unit to steer the main lobe of the antenna array radiation pattern towards the desired signal source without a priory search of the source angular location and, at the same time, to remove the signals of the external interferences and the intersymbol interference in the array output signal. The simulation has been carried out, using a linear array with 16 omnidirectional antennas. It operates in the condition of-30 dB Signal-to-Interference Ratio and 10..30 dB Signal-to-Noise Ratio. The array receives the Phase Shift Keying (8-PSK) desired signal, passed through a two-rays communication channel with about-65 dB gaps in the channel amplitude-frequency response. © 2020 IEEE.

关键词： Equalizers

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Adaptive Arrays Based on Real-Valued Arithmetic Linearly-Constrained IQRD RLS Adaptive Filtering Algorithms 3

Adaptive Arrays Based on Real-Valued Arithmetic Linearly-Con...

引用

3rd IEEE Ukraine Conference on Electrical and Computer Engineering, UKRCON 2021

作者： Djigan, Victor Institute for Design Problems in Microelectronics of RAS Department of Integrated Circuits Design Methodology Moscow Russia

ISBN: (纸本)9781665400947

This paper presents computational procedures for implementation of multi-beam adaptive antenna arrays with digital beamforming. The weights of the arrays are calculated using the Linearly Constrained Inverse QR Decomposition Recursive Least Squares adaptive filtering algorithms. Two versions of the algorithms are presented: With and without square roots arithmetic operations. The algorithms are fitted to the antenna arrays with odd symmetry. This symmetry allows to develop the adaptive filtering algorithms with most of the computations in real-valued arithmetic. This saves the number of the arithmetic operations required per algorithm iteration. Besides, this implementation decreases the transient response duration and improves the steady-state interference cancellation for about 3 dB in terms of the depths of the radiation pattern gaps towards the interference sources. The efficiency of the proposed solution is demonstrated via simulation of interference cancellation using a rectangular flat adaptive antenna array. © 2021 IEEE.

关键词： Adaptive filters

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A Forgotten Technology: Phase Adaptation in Arrays with Digital Beamforming

A Forgotten Technology: Phase Adaptation in Arrays with Digi...

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2020 IEEE Ukrainian Microwave Week, UkrMW 2020

作者： Djigan, Victor Institute for Design Problems in Microelectronics of Ras Department of Integrated Circuits Design Methodology Moscow Russia

ISBN: (数字)9781728173139

ISBN: (纸本)9781728173139

This paper considers the adaptive Antenna Arrays (AA) with Digital Beamforming (DBF) and phase-only adjustment of the base-band channel signals. Although the DBF arrays allow to use the complex-valued weights and the traditional adaptive signal processing, the phase adaptation is still attractive in this sort of AA due to the elimination of weights' scaling in case, when the AA and the adaptive algorithm are implemented in a finite bits arithmetic. That is an important feature for the adaptive AA which usually operates with signals of a priory unknown dynamic range. In this paper, an algorithm for the calculation of the phases of the weights of the adaptive AA with DBF, which is based on the stochastics gradient search, is presented. According to the simulation, in the steady-state, the algorithm ensures up to 80 dB of the interference suppression and less than 1 dB of the desired signal degradation. The results are obtained for the simulation experiments with one to three interferences with -30 dB signal-to-interference ratio each and 0... 20 dB signal-to-noise ratio in AA channels. The AA, which uses the algorithm, demonstrates the properties, similar to those of an AA with other known phase adaptation algorithms, namely a) the number of interference sources, which can be suppressed, is twice less than that of the AA with complex-valued weights, b) the interference sources cannot be located symmetrically relative to the AA beam direction and 3) the phases of the steady-state weights have an odd symmetry over the AA aperture. These results validate the proposed adaptive filtering algorithm and confirm its correct behavior. The radiation patterns, phase distribution over the AA aperture, received and processed data signal constellations are demonstrated. © 2020 IEEE.

关键词： Beamforming

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