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Reduced Complexity Antenna Array Calibration Algorithm

Reduced Complexity Antenna Array Calibration Algorithm

引用

Digital Signal Processing and its Applications (DSPA), International Conference on

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

A phase-less algorithm of the antenna array calibration is presented in this paper. The algorithm is used to estimate and compensate the signal phase lag variation in the array channels. The estimated phase lags include the lags, caused by the channel equipment, and the lags, caused by the signal source spatial location in the case of the receiving array or, otherwise, the receiver spatial location in the case of the transmitting array. The compensation of the first-mentioned phase lags means the array calibration and the compensation of the second-mentioned phase lags means the array calibration and beam steering simultaneously, because the channel, space and phase lags are not separable. The proposed algorithm requires $\boldsymbol{4+4(M-1)}$ measurements of the array output power after the changing of the signal phase to the specific values sequentially in the pairs of the reference and each of the calibrated channels of the array. Here, $\boldsymbol{M}$ is the number of the array channels. This algorithm requires about 33% less power measurements, and therefore has less complexity comparing to the similar calibration algorithm, which requires $\boldsymbol{2+6(M-1)}$ of such measurements. The accuracy of the channel phase estimation using the proposed or known calibration algorithm does not exceed the value of one discrete of the phase quantization by means of the digitally controlled phaseshifter. The proposed algorithm can be used in arrays of arbitrary geometric configuration.

关键词： Phased arrays Antenna measurements Power measurement Phase measurement Array signal processing Signal processing algorithms Channel estimation

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Low Complexity RLS Adaptive Filters

Low Complexity RLS Adaptive Filters

引用

Digital Signal Processing and its Applications (DSPA), International Conference on

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

This paper presents two adaptive filters with a reduced arithmetic complexity which are based on the Recursive Least Squares (RLS) algorithms. The first one is the cascaded adaptive filter. The second one is the adaptive filter with the diagonalized correlation matrix of the input signal. The both filters have a reduced arithmetic complexity comparing to the direct implementation of the adaptive filter. The cost of the reduction is some degradation of the adaptive filter performance. The reduction is achieved only if the RLS algorithms with quadratic complexity are used. The computational procedures and the arithmetic complexities of the considered adaptive filters are the same, but the performance is different. This paper presents the RLS algorithms based on the Matrix Inversion Lemma (MIL). However, all the results and conclusions are valid for any RLS algorithms with quadratic complexity. The paper demonstrates the considered adaptive filter performance via simulation.

关键词： Degradation Adaptation models Costs Correlation Adaptive filters Signal processing algorithms Digital signal processing

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Static Timing Analysis Method for Reconfigurable SoC with Various Types of Routing Resources

Static Timing Analysis Method for Reconfigurable SoC with Va...

引用

Electrical Engineering, Automation & Control Systems, Theory and Practical Applications (EEACS), Seminar on

作者： Vasilii M. Khvatov Computer Aided Design Department Institute for Design Problems in Microelectronics of Russian Academy of Sciences (IPPM RAS) Moscow Russia

Reconfigurable systems on a chip (RSoC) routing tree architecture consists of both digital elements and MOS switches. To evaluate the performance of routed integrated circuits (ICs), a netlist and a library of characterized elements is required. However, the MOS switch is an analog element and models for describing the time parameters of digital cells, including the non-linear delay model, cannot be applied to it. To solve this problem, this paper proposes a method for estimating the ICs performance based on the use of the connections equivalent electrical capacity and proposed formulas for calculating time parameters. The formulas were obtained as a result of researching the dependence of circuit timing characteristics on three parameters: the number of pass switches in the net, the load capacitance and the parameters of transistors at the output stage of the routing element. The approach allows to calculate the output signal parameters for various types of RSoC routing elements, including pass transistors, without critical losing of accuracy.

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Hardware Implementation of Convolutional Neural Network Based on Systolic Matrix Multiplier

Hardware Implementation of Convolutional Neural Network Base...

引用

Intelligent Technologies and Electronic Devices in Vehicle and Road Transport Complex (TIRVED)

作者： Alexander Stempkovskiy Roman Solovyev Dmitry Telpukhov Alexander Kustov Department of Design Methodology of Integrated Circuit Institute for Design Problems in Microelectronics of Russian Academy of Sciences (IPPM RAS) Moscow Russia

In this paper, we consider possibility of using matrix multipliers in hardware implementation of convolutional neural networks. Literature review has been conducted, existing matrix multiplication methods and their hardware implementations has been analyzed. Systolic algorithm for matrix multiplication (SMM) based on divide-and-conquer approach is proposed. This algorithm has been implemented as parameterized generator of hardware descriptions. Its positive and negative aspects are identified. Main difficulties of preparing feature maps for matrix multiplication are analyzed. Comparative analysis of hardware implementations of MobileNet neural network has been carried out for implementations based on convolutional blocks and implementations based on systolic matrix multiplier. A combined method is proposed that has the advantages of both approaches.

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Simulated Annealing Based Placement in FPGAs with a Modified Permutation Operator and Congestion Optimization

Simulated Annealing Based Placement in FPGAs with a Modified...

引用

Informatics, Electronics, and Radio Engineering (PIERE), International Conference problems of

作者： Rustam Zh. Chochaev Vladislav A. Zhuravlev Daniil A. Zheleznikov Dept. of design problems in microelectronics NRC “Kurchatov institute” Moscow Zelenograd Russia

ISBN: (数字)9798331516321

ISBN: (纸本)9798331516338

A placement is one of the key stages in the FPGA design flow. The quality of the resulting placement affects the routing results and, therefore, the performance of the designed circuits. In this paper we present a flat simulated annealing based placement algorithm. The key features of the developed algorithm are modified move operator, which reduces the solution search space, and congestion optimization based on the nets overlap method. The developed algorithm has been tested on an open set of circuits and compared with three placement algorithms: basic flat simulated annealing based placement algorithm, multilevel placement algorithm and flat placement algorithm without congestion estimation. The experimental results demonstrate that the developed algorithm reduces the routing time by 17% on average and the number of used routing resources by 20% on average. Moreover, the developed algorithm reduces the congestion by an average of 15% and increases the routability while increasing the total wirelength due to the reduction of the solution search space.

关键词： Annealing Circuits Estimation Simulated annealing Routing Informatics Field programmable gate arrays Optimization

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Adaptive Arrays for GNSS Receivers

Adaptive Arrays for GNSS Receivers

引用

Informatics, Electronics, and Radio Engineering (PIERE), International Conference problems of

作者： Victor I. Djigan Department of Design Problems in Microelectronics National Research Center “Kurchatov Institute” Moscow Russia

ISBN: (数字)9798331516321

ISBN: (纸本)9798331516338

An adaptive antenna array of the land-based equipment of the Global Navigation Satellite System has to be able to accept the signals from a several satellites and to suppress a several interfering signals simultaneously. The side lobe canceller is one of the widely used adaptive arrays to do this job. Unfortunately, this array does not ensure any specified value of its radiation pattern towards any direction except the directions towards the interfering signal sources. As a result, this array does not ensure the same conditions for the reception of the signals from all visible satellites. The problem solution, which is proposed in this paper, is to use the linearly constrained array instead of the side lobe canceller. A single constraint in a form of a fixed radiation pattern value towards the normal to the array aperture (zenith direction) allows to produce a beam which is always steered towards this direction in spite of the radiation pattern changing caused by the interfering signals cancellation. This ensures a stable reception of the signals at least from the satellites whose angular locations are within the array beam. The performance of a circular linearly constrained array and a circular side lobe canceller of the nine omnidirectional antennas is compared by means of simulation. A better performance of the circular linearly constrained array comparing to the circular linearly constrained array is demonstrated. This is ensured by a wider beam with a bigger gain of the linearly constrained array. This beam allows to receive the signals from a larger number of visible satellites. These results suggest a preferable usage of the linearly constrained arrays against the side lobe cancellers in the receivers of the Global Navigation Satellite System.

关键词： Global navigation satellite system Satellite antennas Satellites Satellite broadcasting Adaptive arrays Receiving antennas Omnidirectional antennas Linear antenna arrays Informatics Antenna radiation patterns

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Room Response Equalizer Based on Simplified RLS Adaptive Filter

Room Response Equalizer Based on Simplified RLS Adaptive Fil...

引用

Digital Signal Processing and its Applications (DSPA), International Conference on

作者： Victor Djigan Institute for Design Problems in Microelectronics of Russian Academy of Sicences Moscow Russia

An equalizer of a room acoustic frequency responses is presented in this paper. Such equalizers often require the usage of a large number of weights adaptive filter that means a large computational complexity of the filter and the equalizer. The considered equalizer uses the modified x-filtered Recursive Least Squares (RLS) adaptive filter. The computationally efficient fast RLS adaptive filters are often unstable if the number of their weights is large. That is why such filters are not suitable for the application in the room equalizers. The Matrix Inversion Lemma (MIL) RLS adaptive filters are stable but they are computationally complex in such applications. The equalizer presented in this paper uses a simplified MIL RLS adaptive filter. The correlation matrix of the filter is diagonalized. Besides, each of a square submatrix at the diagonal of the simplified correlation matrix are inverted using the computationally efficient version of the MIL which takes into consideration the symmetrical structure of these submatrices. The simulation proves the operability of the equalizer and demonstrates the efficiency of the simplified equalizer comparting to its full version. The demonstration includes different pictures like the frequency responses, power spectral densities and signal waveforms.

关键词： Symmetric matrices Correlation Equalizers Adaptive filters Signal processing algorithms Digital signal processing Filtering algorithms

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CAD Architecture for Expansion of WSL-Based Combinational Circuits Dataset

CAD Architecture for Expansion of WSL-Based Combinational Ci...

引用

International Russian Smart Industry Conference (SmartIndustryCon)

作者： V. V. Zunin A. L. Stempkovsky R. A. Solovyev HSE University Moscow Russian Federation Institute for Design Problems in Microelectronics of Russian Academy of Sciences Moscow Russian Federation

The paper provides an overview of the current state of research in the field of combinational circuits reliability and parameters. Architecture of OpenLane flow, its components and main stages of work are described. Based on this flow, the main parameters are provided that will be used for augmentation and expansion of combinational circuits dataset and further testing. Previously developed software was elaborated to use OpenLane as its part. That is, now WSL (Ubuntu) can be used to launch OpenLane workflow from a Windows program without copying data from/to Linux system; subsequent parsing of the results to highlight the necessary parameters is implemented; parameters are saved to combinational circuits dataset. The modified software was tested for circuit generation and parameters calculation.

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Low Complexity Partially Adaptive Antenna Array Based on Recursive Least Square Algorithm

Low Complexity Partially Adaptive Antenna Array Based on Rec...

引用

Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO)

作者： V. I. Djigan Department of Integrated Circuits Design Methodology Institute for Design Problems in Microelectronics of RAS Moscow Russia

ISBN: (数字)9781665470643

ISBN: (纸本)9781665470650

The adaptive array with a rectangular aperture, whose antennas are placed in the nodes of the rectangular grid, is considered in the paper. The partial adaptability is provided via the base-band combination of the signals in the rows and in the columns of the array. Opposite to the hybrid arrays, based on the subarray output signals combination, the arrays based on the row and the column signal combination, do not suffer on the grating lobes phenomenon, which restricts the ability of the cancellation of the interferences, whose source spatial locations are coincided with those of the grating lobes. A version of the Matrix Inversion Lemma Recursive Least Squares adaptive algorithm for the partially adaptive narrow-band array weight calculation is presented. The Householder transform or QR decomposition adaptive algorithms can be used as well. The algorithm arithmetic complexity does not depend on the number of the array antennas, but depends on the array columns number and the rows number. The simulation results demonstrate that the steady-state performance of the adaptive array with the partial adaptation is the same as that of the adaptive array with the full adaptation if the number of the received signal sources does not exceed the number of the partially adaptive array weights. The dynamic behavior of the both arrays in the terms of the radiation pattern values in the directions of the received signal sources is differed only at the initial stage of the transient response. The equivalent weights of the full array used for the radiation pattern calculations are reconstructed via the combination of the weights of the crossed rows and the crossed columns of the partially adaptive array. The considered partial adaptation can be used in the large rectangular antenna arrays.

关键词： Transient response Array signal processing Adaptive arrays Adaptive algorithms Transforms Complexity theory Telecommunications

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Development of Incoherent 90 GHz Band SINIS Receiver for BTA Telescope 9

Development of Incoherent 90 GHz Band SINIS Receiver for BTA...

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9th IEEE All-Russian Microwave Conference, RMC 2024

作者： Tarasov, Mikhail Gunbina, Aleksandra Krasilnikov, Artem Mansfeld, Mariya Vdovin, Vyacheslav Chekushkin, Artem Edelman, Valerian Yusupov, Renat Troyanovskiy, Alexey Kukushkin, Dmitrii Bolshakov, Oleg Maruhno, Andrei Ermakov, Andrey Golovanova, Anastasia Superconducting Devices V. Kotelnikov Institute of RadioEngineering and Electronics Moscow Russia Institute of Applied Physics of RAS Radio Receiving Equipment and Millimeter-Wave Radio Astronomy Nizhny Novgorod Russia Institute of Applied Physics of RAS Design-engineering Department Nizhny Novgorod Russia P. Kapitza Institute for Physical Problems Moscow Russia Applied Optics Center ITMO University Saint Petersburg Russia Institute of Applied Physics of RAS Nizhny Novgorod Russia Special Astrophysical Observatory RAS Nizhnii Arkhyz Russia

ISBN: (纸本)9798331540944

The results of the development of 90 GHz frequency band planar antenna arrays with integrated detectors based on superconductor- insulator - normal metal - insulator-superconductor (SINIS) structure are presented in this article. The implementation of the developed receiver to the optical Big Telescope Alt-Azimuthal in SAO ras is proposed. © 2024 IEEE.

关键词： Metal insulator boundaries

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