Vladimir Lyashev

Vladimir Lyashev
Huawei Technologies · Russian Research Institute

Doctor of Engineering

About

23
Publications
3,958
Reads
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33
Citations
Citations since 2017
16 Research Items
28 Citations
20172018201920202021202220230246810
20172018201920202021202220230246810
20172018201920202021202220230246810
20172018201920202021202220230246810
Introduction
Professional and dedicated individual with 10 years’ experience in computational codes development for modeling electrical and communication systems, PHY level algorithm design. Good level in digital signal processing, applied mathematics and math. statistics, working experience in C++ algorithm implementation, knowledge about integer arithmetic for FPGA and DSP implementation. Vladimir received the bachelor's degree in Electrical Engineering and the M.E. in Electrical Engineering from Taganrog State University of Radio Engineering, Taganrog, Russia in 2002 and 2004, respectively. He took part in the Virtual Test Bed (VTB) project as a model and system developer. He also participated in developing ICS and DCS systems. In 2011 he had joined to Huawei Research Center and involved in algorithm design for LTE advanced receiver.
Additional affiliations
August 2011 - present
Huawei Technologies
Position
  • Engineer
January 2011 - August 2011
National Instruments
Position
  • Field Application Engineer
July 2007 - January 2011
Southern Federal University
Position
  • Professor (Associate)
Education
September 2004 - May 2007
Southern Federal University
Field of study
  • Electrical Engineering

Publications

Publications (23)
Preprint
Full-text available
Reconfigurable Intelligent Surface (RIS) is a planar array that can control reflection and thus can implement the concept of partially controllable propagation environment. RIS received a lot of attention from industry and academia, but the majority of the researchers who study RIS-assisted systems use simple Rician model. Though it is suitable for...
Article
Reconfigurable Intelligent Surfaces (RISs) are promising and relatively low-cost tools for improving signal propagation in wireless communications. An RIS assists a base station in optimizing the channel and maximizing its capacity by dynamically manipulating with reflected field. Typically, RISs are based on dynamically reconfigurable reflectarray...
Preprint
Full-text available
Reconfigurable Intelligent Surfaces (RISs) are promising and relatively low-cost tools for improving signal propagation in wireless communications. An RIS assists a base station in optimizing the channel and maximizing its capacity by dynamically manipulating with reflected field. Typically, RISs are based on dynamically reconfigurable reflectarray...
Preprint
Based on maritime and airline routes traffic given by automatic dependent surveillance (ADS) real data and population distribution model we assumed that asymmetric user distribution scenarios could be quite often in LEO satellite communication systems. To increase payload flexibility in such scenarios we have proposed simple partially connected (PC...
Conference Paper
Channel State Information (CSI) feedback is a very relevant topic for Frequency Division Duplexing (FDD) Multiple Input/ Multiple output (MIMO) on 4G/LTE systems and it will be also the case for the development of future Massive MIMO 5G standards. In the following article, we present a novel CSI compression technique based on the potential of Karhu...
Conference Paper
Full-text available
Random-access is essential for any cellular system. In LTE, random-access is a part of a contention-based random-access procedure, where in the first step terminal transmits one randomly selected preamble. In this paper, we show that random-access can be enhanced if terminal may transmit more than one preamble and consider how to adapt random-acces...
Conference Paper
Full-text available
In this paper, we present a fast algorithm of time synchronization between User Equipment (UE) and Base Station (BS) which is suitable for Long Term Evolution (LTE) Random Access Channel (RACH). The algorithm reduces the complexity more than 1.5 times. Further, if the SNR is above a threshold, the algorithm allows to extremely reduce the complexity...
Conference Paper
Full-text available
Problem of pilot contamination and blind spatial filtering for massive MIMO is considered in this paper. Blind spatial filtering method based on MUSIC angle of arrival (AoA) estimation is proposed as a possible solution for this problem. And error distribution is examined with respect of channel angular spread. Spatial properties of the telecommuni...
Conference Paper
Full-text available
This paper is described intra-cell interference in case of multiuser access based on single-carrier frequency division multiple access signals (SC-FDMA), which is used in LTE networks for uplink control channel and virtual multiple-input multiple-output (V-MIMO) mode. It is shown the reason of intra-cell interference and performance degradation. Al...
Conference Paper
Full-text available
Since Release 8 Long-Term Evolution (LTE) by the 3rd Generation Partnership Project (3GPP), the uplink control channel called the physical uplink control channel (PUCCH) is specified. In this paper, we propose a new multi-user joint receiver processing for LTE PUCCH that counteracts the intra-cell interference (ICI). Using the fact that the receive...
Article
A new methodology for the evaluation of nonfailure operating time (NFOT) in the virtual test bed (VTB) environment is proposed. The proposed method is featured by the application of time-frequency analysis to estimate the parameters of reliability at the earliest stages of design based on the intercoupling of the 1/ f noise and the reliability of p...
Article
Full-text available
this paper describes new results on distributed computer simulations within the Virtual Test Bed (VTB) environment for virtual prototyping. Network distributed simulations can potentially lead to significant improvement of the computational performance and can expand the range of uses of time domain simulators. Here, we consider methods for improvi...
Conference Paper
Full-text available
A new methodology for the evaluation of non-failure operating time (NFOT) in virtual test bed environment is proposed. The proposed method is featured by the application of signal processing techniques to estimate parameters of reliability at the earliest steps of design based on intercoupling 1/f noise and reliability of power system elements. The...

Questions

Question (1)
Question
There is a philosophical question: from engineering point of view, it is always better to have modular system with minimal connections between modules. I don't mention advantages of modular approach - let consider it as statement. The same time to achieve some additional gain and flexibility of the system, many developers (especially more mathematicians rather engineers) are looking for something called Cross-Layer Optimization, which is required more and more links between modules that moves from modular architecture to unified one: and all modularity is emulated as slices on software level. How do we can to merge these two contradictionary approaches into one, and do we need to do it ?

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Projects (2)
Project
While the benefits of conventional MIMO systems are well established, it is becoming evident that in the future these systems cannot support the exponentially growing wireless data traffic. Recently, the concept of massive MIMO has been introduced that can significantly improve the performance of wireless networks. In a massive MIMO system, base stations are equipped with arrays comprising of a large number of antennas. As a consequence, the base station with very large array can serve hundreds of users simultaneously. Besides, the effects of small scale fading can be averaged, i.e., the random channel matrix approaches a deterministic matrix. When a number of antennas is asymptotically large, the random channel vectors of individual users become pairwisely orthogonal. It results in the maximization of capacity as the channel matrix becomes now well-conditioned. Another interesting property of massive MIMO is that the simplest forms of user detection and precoding such as matched-filtering and eigenbeamforming are optimal for the case when a number of antennas tends to infinity. With a very large array, the transmit power can be reduced proportionally to a number of antennas used in the array. This is an intriguing feature as the arrays can now be built using a number of tiny and low power antenna devices like radio cube from ALU, it results in the miniaturization of base stations. For these and many other benefits, the massive MIMO technique is now being considered as a promising technology to employ in the next generation wireless networks.