Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
78
13
2019
PREDICTION OF SIGNAL DENOISING EFFICIENCY FOR DCT-BASED FILTER
1129-1142
10.1615/TelecomRadEng.v78.i13.10
S. K.
Abramov
Department of Transmitters, Receivers and Signal Processing, National Aerospace University (Kharkiv Aviation Institute), 17 Chkalov St.,
Kharkiv, 61070, Ukraine
V. V.
Abramova
National Aerospace University (Kharkiv Aviation Institute), 17, Chkalov St., Kharkiv, 61070, Ukraine
V. V.
Lukin
National Aerospace University (Kharkiv Aviation Institute), 17 Chkalov St.,
Kharkiv, 61070, Ukraine
Karen O.
Egiazarian
Tampere University, Department of Signal Processing, P. O. Box 553, FIN-33101, Tampere, Finland
signal denoising
prediction
efficiency
Signals acquired by different sensors are often noisy and are subject to filtering aimed to reduce noise and preserve important information. Although a great number of different filters exist, their performance does not always satisfy users. There are practical situations when denoising does not lead to expected positive effect which makes it useless. In this paper, we show that a denoising efficiency can be predicted for DCT-based filters. This can be accurately done by an analysis of statistics of DCT-coefficients in a limited number of blocks without execution of denoising itself. Peculiarities of preliminary analysis needed to carry out prediction are discussed. It is shown that a prediction is able to perform well for a wide range of signals and signal-to-noise ratios.
WARP IMPLEMENTATION OF SLIDING TAXICAB NORM TRANSFORM TECHNIQUE FOR PAPR REDUCTION IN OFDM SYSTEMS
1143-1165
10.1615/TelecomRadEng.v78.i13.20
M.
Palanivelan
Department of Electronics and Communications Engineering, Rajalakshmi
Engineering College, Thandalam-602105, India
M.
Lakshmanan
Galgotias College of Engineering and Technology, 1, Knowledge Park II,
Greater Noida, Uttar Pradesh, India
V. Noor
Mohammed
VIT University, School of Electronics Engineering, Thiruvalam Road,
Vellore 632 014, Tamil Nadu, India
Peak to Average Power Ratio (PAPR)
Sliding Taxicab Norm Transform (STNT)
Inverse Sliding Taxicab Norm Transform (ISTNT)
Permutation with Phase inversion Sliding Taxicab Norm Transform (PPSTNT)
Computational Complexity Reduction Ratio
Orthogonal Frequency Division Multiplexing (OFDM) is an efficient method of data transmission for high speed communication systems with high bandwidth efficiency and robustness against multipath fading. OFDM consists of many independent subcarriers, as a result of which the amplitude of such a signal can have high peak values. This high Peak to Average Power Ratio (PAPR) of the signal, when transmitted through a power amplifier generates out-of-band distortions and also increases the dynamic range of the Digital to Analog Converter (DAC) and Power Amplifier (PA). This paper proposes a new PAPR reduction technique termed Sliding Taxicab Norm Transform (STNT) at the transmitter and Inverse STNT (ISTNT) at the receiver. We further propose Permutation with Phase inversion STNT (PPSTNT) technique in our system to deal with highly correlated data. The results show that, the proposed scheme offer better performance in terms of PAPR reduction than the existing sliding norm transforms and various other conventional schemes. We have also proved that the computational complexity of the proposed scheme is lower than the conventional reduction techniques and further, there is no requirement for transmission of Side Information (SI) for recovering the signal at the receiver. The proposed algorithm is implemented on Wireless Open-Access Research Platform (WARP). Various performance measures were analyzed with random data, audio and image input.
CONSTRUCTION PRINCIPLES OF TECHNICALLY INVARIANT QUARTZ GENERATORS BASED ON THE DOUBLE-LOOP PULSE PHASE LOCKING SYSTEMS
1167-1177
10.1615/TelecomRadEng.v78.i13.30
S. K.
Pidchenko
Khmelnytsky National University, Department of Telecommunications and
Computer-Integrated Technologies, Institutska Str. 11, 29000, Khmelnitsky,
Ukraine
A. A.
Taranchuk
Khmelnytsky National University, Department of Telecommunications and
Computer-Integrated Technologies, Institutska Str. 11, 29000, Khmelnitsky,
Ukraine
A.
Totsky
National Aerospace University, Department of Receiving, Transmitting and
Signal Processing, 17 Chkalov Str., 61070, Kharkiv, Ukraine
V. B.
Sharonov
Scientific and Technical Center of Electronic Medical Devices and Technologies National Aerospace University, 17 Chkalov St., Kharkiv, 61070, Ukraine
piezoelectric quartz resonator
quartz crystal oscillator
phase-locked loop
multimode oscillations
destabilizing factors
frequency control
compensation schemes
In this paper, basic constructive principles of technically invariant quarts generators (QGs) based on the double-loop pulse phase locking (DLPPL) systems are considered and discussed. Prospective functionally-algorithmically method using the DLPPL strategy and providing technical invariance of QG is developed. Examples of exploiting the DLPPL systems for compensation of temperature and vibration destabilizing influence on the quartz resonator (QR) are represented for the mode of matching the stabilizing and measuring functions. Assessment of exploiting the functionally-algorithmically method serving for providing technical invariance of the QG for compensation of temperature and vibration destabilizing influence is suggested.
IMPLEMENTATION OF NOVEL CONTROLLER AND COMMUNICATION CHANNEL FOR FREQUENCY CONTROL IN SMART MICROGRID
1179-1191
10.1615/TelecomRadEng.v78.i13.40
K.
Singh
Jamia Millia Islamia (A Central University), Maulana Mohammad Ali Jauhar Marg, Jamia Nagar, Okhla, New Delhi 110025, India
Zaheeruddin
Jamia Millia Islamia (A Central University), Maulana Mohammad Ali Jauhar Marg, Jamia Nagar, Okhla, New Delhi 110025, India
fractional PI controller
microgrid
wind power
solar power
user data gram protocol/internet protocol (UDP/IP)
particle swarm optimization
In this study, the model of microgrid based on multi-agent system is executed in MATLAB/SIMULINK. A microgrid system deploys various sources like solar, wind, diesel generator, fuel cell, aqua electrolyser, hydrogen storage and battery etc. Different components of microgrid interact through user data gram protocol/internet protocol (UDP/IP). In order to facilitate the usage of the battery storage system during transient disturbances a control methodology is proposed, i.e., floating battery scheme in steady state. It will enhance the frequency response of the system. A particle swarm optimization is utilized to optimize the parameters of proposed system.
ANALOG CIRCUIT FAULT DIAGNOSIS METHODS BASED ON RBF NEURAL NETWORK
1193-1201
10.1615/TelecomRadEng.v78.i13.50
Y.B.
Li
Foundational Courses Department, Shaanxi Vocational and Technical College, Xi'an, Shaanxi 710038, China
Zhen
Pan
Xi'an Communication and Signal District of Xi'an Railway Bureau, Xi'an, Shaanxi 710000, China
analog circuit
fault diagnosis
RBF neural network
feature extraction
particle swarm optimization
There are many difficulties in diagnosis of analog circuit faults, and effective methods are needed to make breakthroughs. In this study, fault feature vectors are obtained by the Haar wavelet decomposition, and the radial basis function (RBF) neural network was improved by particle swarm optimization (PSO) algorithm. The signals generated when the circuit was in normal state and when eight kinds of faults occurred were collected by the Butterworth low-pass filter circuit. In total 450 sets of data were obtained, including 350 sets of training samples and 100 sets of experimental samples. It was found that the training time of the PSO-RBF was shorter, the error was smaller, and the accuracy rate was 96%, indicating the high reliability and broad application prospects of the algorithm.
BEAMFORMING BASED ON SLR FOR UPLINK CHANNEL IN MU-MIMO SYSTEM AND DETECTION DESIGN
1203-1211
10.1615/TelecomRadEng.v78.i13.60
C.
Ciftlikli
Erciyes University, Talas, Kayseri, 38280, Turkey
W.
Al-Obaidi
Erciyes University, Talas, Kayseri, 38280, Turkey
M.
Al-Obaidi
Erciyes University, Talas, Kayseri, 38280, Turkey
beamforming
multi-user MIMO
CSI
maximum SLR
OSIC
maximum-likelihood
Multi-user (MU) techniques are adopted in wireless systems to fully benefit from multiple-input multiple-output (MIMO) antenna array. Beamforming (BF) technique in the MU-MIMO limits the effect of the co-channel interference (CCI) and improves capacity, and quality of service (QoS) of the system. In this study, we propose a new uplink MU-MIMO precoding scheme based on maximizing the signal to leakage ratio (SLR). The SLR based beamforming can exclude the CCI and noise for MU-MIMO mode effectively and can be realized more easily than the traditional ideal SINR based system. Our major assumption for the study is that base station (BS) use ordered successive interference cancellation (OSIC) detection when the channel state information (CSI) of each user is available at the BS and in each user. We propose the maximum-likelihood (ML) method to estimate the received symbols. Promising results from the simulation show that the performance of the proposed scheme over Rayleigh and Rician fading channels is significantly better than the performance of the classical uplink MU-MIMO precoding system. In addition, in our proposed scheme there is no restriction on the number of antennas at the transmitter and receiver comparing with the classical uplink MU-MIMO precoding system.
OFFSET MODULATION FOR VISIBLE LIGHT COMMUNICATION SYSTEMS
1213-1222
10.1615/TelecomRadEng.v78.i13.70
Ayad Atiyah
Abdulkafi
College of Engineering, Shirqat, Tikrit University, Iraq
S. M.
Hardan
Tikrit University, Salahaddin, 34, Iraq
M. K.
Hussein
Tikrit University, Salahaddin, 34, Iraq
Ibrahim K.
Sileh
College of Engineering, Tikrit University, Salahaddin, 34, Iraq
visible light communications offset modulation
orthogonal frequency division multiplexing
peak-to-overage power ratio
bit error ratio
In this paper we discuss a new transmission approach for orthogonal frequency division multiplexing (OFDM) in visible light communication (VLC) systems. Unlike existing approaches of OFDM-based VLC systems, the real signal is obtained by utilizing offset modulation (OM) in OFDM-based VLC that can efficiently utilize the available bandwidth without the need of Hermitian symmetry. In the proposed OM-OFDM based VLC scheme, the complex OFDM signals are phased mapped into real values and hence a good bit error rate (BER) performance is achieved compared to conventional approaches. Since no Hermitian symmetry is required in the proposed scheme, simulation results demonstrate that our approach yields 50% improvement in spectral efficiency compared to existing approaches with the same modulation order. Furthermore, the proposed scheme also achieves a considerable reduction in peak-to-average power ratio (PAPR), which is the major drawback of optical OFDM systems.