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Multichannel Acoustic Echo Canceller Based on Fast Affine Projection Algorithm

Multichannel Acoustic Echo Canceller Based on Fast Affine Pr...

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

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

The task of the identification of the multichannel linear system with long channel impulse responses is considered in this paper. The multichannel acoustic echo cancellation in the closed rooms is an example of this task. Dependently on the room size, its decoration and the signal sampling frequency value the duration of the identified impulse responses may take a few thousand samples. To solve this task a multichannel adaptive filter with the corresponding large number of weights is required. The implementation of such filters is a difficult task as the arithmetic complexity of the adaptive filters depends on the number of the filter weights. Due to this reason the effective time-domain Recursive Least Squares (RLS) adaptive filters even in their fast (computationally efficient) forms are rarely used in the acoustic echo cancellers. The computationally simple but less effective time-domain Least Means Squares (LMS) or the Normalized LMS (NLMS) adaptive filters are usually used for this purpose. However, such filters have a number of well-known drawbacks. The slow convergence is one of them when the correlated or nonstationary signals are processed. Speech is an example of such signals. The frequency-domain LMS/NLMS adaptive filters de-correlate the signals. These filters have a smaller computational complexity comparing to their time-domain prototypes. However, as the signals are processed using the blocks of the samples, the frequency-domain adaptive filters introduce the output signal delay and demonstrate a slower convergence because their weights are updated only once per block. This decreases the tracking ability of the frequency-domain adaptive filters. The ability is an important feature of the adaptive filters in the acoustic echo cancellation task because the acoustic medium is usually a not time-invariant one. The usage of the Fast Affine Projection (FAP) adaptive filter is the tradeoff between the acoustic echo canceller efficiency and its complexity. Su

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Simplified Fast Affine Projection Algorithm in Echo Cancellation Tasks

Simplified Fast Affine Projection Algorithm in Echo Cancella...

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Wave Electronics and its Application in Information and Telecommunication Systems (WECONF)

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

This paper considers an adaptive echo canceller which can be used in tasks of acoustic or electrical echo cancellation. The solution of these tasks usually requires the usage of the adaptive filters with a large number of weights. This means that a lot of computational resources of hardware or software are required for the echo canceller implementation. The usage of the Fast (computationally efficient) Affine Projection (FAP) adaptive filtering algorithm ensures the adaptive filter functional efficiency and complexity tradeoff in the echo cancellation tasks. The algorithm consists of two groups of calculations: a fast calculation of the adaptive filter error and a fast calculation of the normalizing matrix and its inversion. The second group is based on the usage of some calculations adopted from the sliding window Fast Recursive Least Squares adaptive filtering algorithms. However these calculations are potentially unstable. The given paper presents a simplified stable version of the multichannel FAP algorithm. The simplification is achieved due to the diagonalization of the normalizing matrix that ensures a simple procedure of direct calculation of this matrix and its inversion. If the echo signal is noisy (and that what always happens in our real world) then the original and the simplified FAP algorithms demonstrate about the same performance. The simulation of the two-channel acoustic echo cancellers confirms this statement.

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Algorithm of Signal Source Angular Location Searching and Tracking by Two-Dimensional Rectangular Array

Algorithm of Signal Source Angular Location Searching and Tr...

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Wave Electronics and its Application in Information and Telecommunication Systems (WECONF)

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

ISBN: (数字)9798350364989

ISBN: (纸本)9798350364996

An algorithm of searching and tracking the angular location of a signal source is presented. It is designed for the usage in a two-dimensional equidistant rectangular receiving antenna array. This algorithm uses symmetric perturbations of the array phase distribution on a fixed phase value and uses estimations of the signal values at the array output after these perturbations. It is required to make four such the perturbations in a two-dimensional array or to make two such the perturbations in a one-dimensional linear array. The array has to be a symmetric one for the algorithm usage. This means, that the phase distribution over the array aperture has to be an odd symmetric relatively the array phase center. Because of the phase perturbation, the algorithm can be used in the analog arrays with the phase only control or in the digital beamforming arrays with the complex-valued weights control. To improve the algorithm accuracy, it is suggested to use a correlator or a matched filter to estimate the array output signals. The estimation can be used if the array receives a pseudo random signal. Such the signals are widely used as the informational ones in a number of modern radio systems. Mathematical details of the proposed algorithm are presented. Simulation demonstrates the performance and the efficiency of this algorithm.

关键词： Phased arrays Matched filters Weight control Perturbation methods Estimation Receiving antennas Filtering algorithms

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Novel Bandpass RLC-Filter 30

Novel Bandpass RLC-Filter

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30th Telecommunications Forum, TELFOR 2022

作者： Denisenko, Darya Prokopenko, Nikolay Butyrlagin, Nikolay Ivanov, Yuri Don State Technical University Department of scientific research Southern Federal University Department of Automatic Control Systems Rostov-on-Don Russia Don State Technical University Department of Information Systems and Radio Engineering Institute for Design Problems in Microelectronics of RAS Zelenograd Rostov-on-Don Russia Institute for Design Problems in Microelectronics of RAS Zelenograd Rostov-on-Don Russia Southern Federal University Department of Automatic Control Systems Rostov-on-Don Russia

ISBN: (数字)9781665472739

ISBN: (纸本)9781665472739

A new architecture of the band-pass RLC filter (RLC-PBF) is considered, in which independent adjustment of the pole frequency, pole quality factor and transmission coefficient is implemented with different resistors at constant values of the capacitance of the frequency-setting capacitor and the frequency-setting inductance. The results of the RLC-PBF simulation in the Micro-Cap environment are discussed, which confirm these properties. The basic mathematical expressions for the transfer function of the RLC-PBF and the parameters of its amplitude-frequency characteristic are obtained. The proposed RLC-PBF circuitry is recommended for adaptive signal filtering in radio engineering and measuring systems. Due to the appropriate choice of parameters of active and passive elements, the operation of the considered RLC-PBF is ensured both at low and at high frequencies. © 2022 IEEE.

关键词： Bandpass filters

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Study of Execution Efficiency of Implementation Versions of Sparse Matrices Multiplication Algorithm on Parallel Dataflow Computing System “Buran”

Study of Execution Efficiency of Implementation Versions of ...

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East-West design & Test Symposium (EWDTS)

作者： N.N. Levchenko A.S. Okunev D.N. Zmejev IPPM RAS Institute for Design Problems in Microelectronics of Russian Academy of Sciences Moscow Russia

ISBN: (纸本)9781538657119

The article proposes to solve problems related to the parallel implementation of the sparse matrices multiplication task, using the architecture of the parallel dataflow computing system “Buran”, which implements the dataflow computing model. The article describes the implementation versions of the sparse matrices multiplication task algorithm in the dataflow programming paradigm. These algorithm implementations demonstrate the simplicity of their creation and universality. The experiments conducted using the behavioural cycle-accurate simulator have shown that the increase in the efficiency of tasks that use a sparse data structure can reach several orders of magnitude when executing them on the parallel data flow computing system.

关键词： Sparse matrices Context Task analysis Handheld computers Programming Computer architecture Indexes

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Decision Directed Adaptive Antenna Array for Operation in Low SNR Conditions

Decision Directed Adaptive Antenna Array for Operation in Lo...

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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 Moscow Russia

ISBN: (数字)9798350373448

ISBN: (纸本)9798350373455

This paper presents an Adaptive Antenna Array (AAA) which is able to suppress the signals of the interferences at its output, to receive the informational signal under the low Signal-to-Noise Ratio (SNR) conditions and to steer its beam (the radiation pattern main lobe) towards the source of the informational signal even if the angular location of the source is initially unknown. It is presented the AAA architecture. The architecture is compared with other architectures of the AAA that are able or not able to operate under the same conditions. The ability to operate in low SNR condition is ensured because of the preprocessing of the AAA channel signals by the correlators or by the matched filters. Such preprocessing is possible if the received informational signal is a Pseudo Random Sequence (PRS). Using the signal as a desired one also allows to use the least squares criterion adaptive algorithms for the AAA weights calculation. This ensures the interferences suppression and the AAA beam steering simultaneously. The considered AAA is able to process the modulated PRS. This ability is provided by the usage of a slicer (like in a decision directed equalizer) which produces the desired signal from the AAA output signal during the steady-state operation. Two versions of the algorithms for the AAA weights calculations are presented. They are the Recursive Least Squares (RLS) adaptive filtering algorithms based on the inverse QR decomposition. Simulation results demonstrate the performance and the efficiency of the considered AAA.

关键词： Training Transient response Three-dimensional displays Adaptive arrays Receiving antennas Steady-state Telecommunications

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Global Distributed Associative Environment - Evolution of Parallel Dataflow Computing System “Buran”

Global Distributed Associative Environment - Evolution of Pa...

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East-West design & Test Symposium (EWDTS)

作者： A. D. Ivannikov N. N. Levchenko A. S. Okunev A. L. Stempkovsky D.N. Zmejev IPPM RAS Institute for Design Problems in Microelectronics of Russian Academy of Sciences Moscow Russia

ISBN: (纸本)9781538657119

A high-performance parallel dataflow computing system that implements a dataflow computing model solves problems in the field of supercomputing, the main one of which is low real performance when parallelizing tasks for hundreds of thousands of computational cores. In this article, a new architecture for the parallel dataflow computing system is proposed - a global distributed associative environment. The concept of the computing system organization is described, which consists in dividing the system into associative computational cores, which in turn consist of a set of local associative elements. The new architecture demonstrates significant advantages over the previous architecture, primarily due to the increased reliability of the system and the simplification of programming.

关键词： Computer architecture Computational modeling Crystals Programming Task analysis Reliability Context modeling

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Evaluating FPGA Routing Architectures with Complex Grid Layouts

Evaluating FPGA Routing Architectures with Complex Grid Layo...

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IEEE NW Russia Young Researchers in Electrical and Electronic Engineering Conference (EIConRusNW)

作者： Rustam Zh. Chochaev Sergey V. Gavrilov Institute for Design Problems in Microelectronics of Russian Academy of Sciences (IPPM RAS) Moscow Russia

ISBN: (数字)9781665404761

ISBN: (纸本)9781665446426

The problem of FPGA architecture routability evaluation has always attracted the designers' attention. Nowadays most of the chip delay and area is due to the routing wires and switches that make accurate and efficient evaluation very important. Traditionally FPGA routing architectures have been studied using experimental techniques. However, a full CAD flow is time-consuming and requires tuning to a given architecture. Therefore, more attention is paid to various metrics, models and algorithms that allow routing evaluation without using a full design *** is a modern tool that allows the designers to quickly estimate architectures' routability. It evaluates the wires' congestion and routability by counting paths in the routing graph. In this work we present further development of Wotan, adding support for complex grid layouts containing large macroblocks like RAM, etc. We show that the enhanced Wotan produce more accurate routability metric compared to the previous version.

关键词： Measurement Layout Wires Tools Routing Field programmable gate arrays Tuning

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Prospect of Analyzing Integrated Circuits Based on Dataset with Synthesis Results

Prospect of Analyzing Integrated Circuits Based on Dataset w...

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Siberian Conference on Control and Communications (SIBCON)

作者： Ilya A. Mkrtchan Dmitry V. Telpukhov Alexander L. Stempkovsky Institute for Design Problems in Microelectronics of Russian Academy of Sciences (IPPM RAS) Moscow Russia

ISBN: (纸本)9781665476294

When designing blocks for integrated circuits, it is crucial to understand whether the module in question meets set constraints. Area and timing are important parameters which are being obtained after synthesizing the circuit with specialized tools. However, this process can be too time consuming. In this paper we present an overview of methods, which can be used to determine area and timing with a prepared dataset. Bilinear interpolation, approximation and deep neural networks are being used for this task. The results show that though the first two methods can be used in special cases, the machine learning approach is more flexible and can be effectively implemented for integrated circuit analysis.

关键词： Integrated circuits Deep learning Interpolation Machine learning algorithms Neural networks Libraries Timing

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Investigation of sparse matrix multiplication task for the PDCS “Buran”

Investigation of sparse matrix multiplication task for the P...

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East-West design & Test Symposium (EWDTS)

作者： N. N. Levchenko A. S. Okunev D. N. Zmejev Institute for Design Problems in Microelectronics of Russian Academy of Sciences (IPPM RAS) Moscow Russia

In order to improve the efficiency of the sparse matrices multiplication task on a traditional cluster supercomputer, it is necessary to take into account different levels of parallelism when programming. To work around these problems the dataflow computing model with the dynamically formed context and the architecture of the parallel dataflow computing system can be used. The article describes the implementation of a parallel algorithm of the sparse matrices multiplication task on the parallel dataflow computing system. The experiments performed on the emulator of the system demonstrate the application perspectiveness of the dataflow computing model for this class of tasks.

关键词： Sparse matrices Computational modeling Handheld computers Parallel algorithms Programming Context modeling

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