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Frequency and magnitude evaluation are two of the main signal analysis tasks in the electrical power systems. This paper presents a simple and robust algorithm which enables an accurate estimation of the harmonic parameters of signals with unknown frequency. Differing from the existing approaches, frequency and magnitude of harmonic waves are simultaneously and precisely identified. The proposed algorithm...
In this paper, a wide-range frequency offset tolerant OFDM for in-vehicle PLC system is presented. The carrier frequency and a new short frame OFDM suitable for low latency sensor network are discussed by analyzing the noise immunity, electrical emission characteristics and the channel property. We propose a new lookup table based estimation method of carrier frequency offset (CFO) and sampling frequency...
The paper presents the methods for improving the accuracy of impedance measurements to the root system of plants and the ambient temperature. The proposed methods are based on the digital data processing using the maximum likelihood approach, which helps reduce the cost of the measurement devices. A comparison of the achieved measurements accuracy was carried out using the simulation technique.
A nonlinear deterministic attitude estimator is developed. The estimator evolves directly on the special orthogonal group of rigid-body rotations. Similar estimators in the literature are characterized by constant estimator gains that amplify noise across all frequencies. The proposed method accounts for undesirable noise in exteroceptive measurements by incorporating a strictly positive real (SPR)...
In this paper, we present a simple and intuitive approach to estimate the frequency of a single-tone signal in the presence of noise. We obtain three optimum discrete-time Fourier transform (DTFT) points for application of non-polynomial parabola interpolation to determine the frequency corresponding to its maxima. The results indicate that high performance, in terms of root-mean-square error (RMSE)...
The demand for high speed, reliable communication using available frequency spectrum results in a new technology called OFDM. Channel estimation has a vital role in finding the effect of the channel on OFDM signal. In this work, performance analysis and implementation of pilot aided channel estimation is investigated. Different channel estimation methods like Least Square, Minimum mean Square Error...
In this paper, the authors address the problem of true Cramer-Rao lower bound (CRLB) derivation for a non-data-aided (NDA) vector parameter estimation over non-constant gain flat Rayleigh fading channel (FRFC). General CRLB expressions for carrier frequency offset, carrier phase, symbol timing and signal to noise ratio (SNR) estimation are analytically developed going through the computation of the...
MIMO-OFDM is commonly used for communication system because it provides high data rates and fading effect which is introduced by multipath propagation; the system is robust against it. In MIMO-OFDM, channel estimation is a crucial technique for the estimation of the transmitted signal bits upon the received signal bits. Designing pilot pattern is an important step to realize PSA-OFDM. For channel...
This work investigates the parameter estimation performance of line spectral estimation/super-resolution using atomic norm minimization. The focus is on analyzing the algorithm's accuracy of inferring the frequencies and complex magnitudes from noisy observations. When the Signal-to-Noise Ratio is reasonably high and the true frequencies are separated by O(1/n), the atomic norm estimator is shown...
In the context of global navigation satellite systems, this paper addresses the problem of refining the Doppler frequency estimation provided in the acquisition stage for highorder binary offset carrier (BOC) signals in post-correlation. The refinement of Doppler frequency must be done because the estimation obtained from the acquisition stage is not usually accurate enough to track the signal in...
Precise tracking of frequency is essential for accurate phasor estimation at off nominal frequencies. In this paper, a simple approach for real time frequency estimation involving interpolation of DFT coefficients corresponding to fundamental and two adjacent bins is presented. In particular, quadratic interpolation method is adopted to estimate the frequency. The quadratic interpolation formulation...
There is a wide diversity of applications relying on the identification of the sequences of n consecutive words (n-grams) occurring in corpora. Many studies follow an empirical approach for determining the statistical distribution of the n-grams but are usually constrained by the corpora sizes, which for practical reasons stay far away from Big Data. However, Big Data sizes imply hidden behaviors...
Phase-locked loop based on an anticonjugate decomposition and a cascaded delayed signal cancellation (ACDSC-PLL) strategy is a recognized technique for estimating the single-phase grid voltage fundamental parameters such as amplitude, frequency and phase angle. However, it struggles with high order harmonics and increases complexity in real time implementation when the number of delayed signal cancellation...
In this paper we consider a constant envelope pilot signal based carrier frequency offset (CFO) estimation in massive multiple-input multiple-output (MIMO) systems. The proposed algorithm performs spatial averaging on the periodogram of the received pilots across the base station (BS) antennas. Our study reveals that the proposed algorithm has complexity only linear in (the number of BS antennas)...
Provisioning of cost-effective Ethernet-based fronthaul by reusing the LAN infrastructure available in most commercial buildings is challenging predominantly in terms of the required bandwidth and synchronization. In contrast to a synchronous fronthaul, a PTP-based Ethernet network must cope with estimation noise introduced by packet delay variation (PDV) for synchronization recovery. The SYNC packet...
In this paper, we propose a simple calibration method for an ad hoc microphone array that utilizes sound emissions. Assuming that each device has a function to record sound while emitting another sound, the location, the recording time offset, and the sampling frequency mismatch of each device are estimated from the time of arrival (TOA) of the sound emitted by each device. The accurate estimation...
The two major sources of disturbances for an efficient and reliable data transmission through power lines, known as power line communication (PLC), are impulsive noise (IN) and narrow band interference (NBI). In this paper, we propose an algorithm to cancel the IN and NBI simultaneously for an OFDM based PLC system. The proposed method exploits the duality of the problem, where the IN is sparse in...
This paper proposes a programmable Low Pass Filter (LPF) to improve the performance of sensorless stator flux orientation control for induction motors. Commonly, a pure integrator based on the voltage model is used to estimate stator flux linkages for its simplicity. However, due to noise errors such as strong Gaussian noise variance, a drift and a dc offset are easily produced by the integrator when...
Among the significant renewable resources, wind power has acquired the spotlight, due to the quick development in wind energy conversion technology. However, the penetration level of wind power cannot be increased randomly for maximum power generation primarily because the wind farms cannot always provide a precise amount of power similar to the conventional synchronous generators. Since the frequency...
This paper deals with the baseband digital demodulation of bursty BPSK signals in the presence of frequency, phase and time offset in an Additive White Gaussian Noise (AWGN) impaired narrowband satellite TDMA channel. The receiver perform the tasks of acquiring synchronization in time, frequency and phase, matched filtering, BPSK demodulation and soft decision Viterbi decoding on the received baseband...
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