This paper presents a novel adaptive harmonic detecting algorithm. For step change of load current, it can reduce the filter transient period to less than one fundamental cycle without affecting steady-state accuracy,...
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ISBN:
(纸本)0780379063
This paper presents a novel adaptive harmonic detecting algorithm. For step change of load current, it can reduce the filter transient period to less than one fundamental cycle without affecting steady-state accuracy, and additional calculation is very little. The algorithm based on the analysis of transient behavior of adaptive weighting factors. It is proven that the expectation of weighting values converge exponentially with fixed time constant during transient period. The time constant is independent of system frequency and load current. So the steady-state weighting values can be estimated from the initiative variety of exponential curve. Simulation results verified theoretical analysis.
Aiming at the delay between the interference signal and the reference signal in the radiated interference cancellation system(RICS), an adaptive delay matching model was established. Through theoretical derivation, th...
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ISBN:
(纸本)9781728161365
Aiming at the delay between the interference signal and the reference signal in the radiated interference cancellation system(RICS), an adaptive delay matching model was established. Through theoretical derivation, the basic principle of signal time delay estimation is analyzed, and the delay matching model is simulated by MATLAB. The results show that the model can effectively estimate the time delay between the interference signal and the reference signal and match the two signals.
This paper describes a single channel, full-duplex wireless communication system that can receive and transmit at the same frequency band in the same time. Recent researches have proved the feasibility of full duplex ...
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ISBN:
(纸本)9781612846835
This paper describes a single channel, full-duplex wireless communication system that can receive and transmit at the same frequency band in the same time. Recent researches have proved the feasibility of full duplex wireless communication in practice, by canceling the self-interference signal to obtain the desired signal. In this paper, we propose an adaptive digital self-interference cancellation technique, which combines with existing antenna separation and balun based cancellation to achieve the quantity of self-interference cancellation needed for full-duplex system. An adaptive filter based on least mean square (lms) algorithm is applied to track amplitude and phase variations to produce an expected cancellation signal, after the initial delay and frequency offsets are compensated. Our simulation results display that the adaptive digital interference cancellation scheme has fairly desirable self-interference signal cancellation performance.
Recently, an adaptive convex combination of two lms (Least Mean-Square) filters was proposed and its tracking performance analyzed. Motivated by the performance of such scheme and by the differences between the tracki...
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ISBN:
(纸本)1424407281
Recently, an adaptive convex combination of two lms (Least Mean-Square) filters was proposed and its tracking performance analyzed. Motivated by the performance of such scheme and by the differences between the tracking capabilities of the RLS (Recursive Least-Squares) and lms algorithms, we propose a convex combination of one lms and one RLS filter. The resulting combination should profit of the best tracking behavior of each component filter. A steady-state analysis via energy conservation relation is also presented for stationary and non-stationary environments.
Predistortion technology is an adaptive, low cost and potential linearization method. Proper loop-delay estimation and compensation are important preconditions for ensuring the predistorter working well. But tradition...
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ISBN:
(纸本)9781467309905;9781467309882
Predistortion technology is an adaptive, low cost and potential linearization method. Proper loop-delay estimation and compensation are important preconditions for ensuring the predistorter working well. But traditional loop-delay estimation algorithms are vulnerable to the amplifier's memory and nonlinear distortion. In this paper, based on the relationship between the system loop-delay and the amplitude of predistorter error output, we propose a new loop-delay estimation algorithm which improves the algorithm estimation accuracy in memory nonlinear distortion. Simulation results show that the NMSE after the predistortion is very close to the ideal one and a good power spectral density (PSD) performance is achieved. The new algorithm realizes the predistorter and the loop-delay estimation working simultaneously that maintains the reliability and continuity of signal transmission.
A novel multi-microphone speech enhancement method with low computational complexity using the Generalized Sidelobe Canceller (GSC) structure based on lms (least mean square) algorithm is proposed under stationary noi...
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ISBN:
(纸本)9781424421138
A novel multi-microphone speech enhancement method with low computational complexity using the Generalized Sidelobe Canceller (GSC) structure based on lms (least mean square) algorithm is proposed under stationary noise condition. In adaptive module of the presented method, speech signals in one frame share the same weight and update simultaneously instead of calculating weights respectively. Experimental results show that, in stationary noise environment, the proposed method which employs modified lms algorithm outperforms conventional lms algorithms in noise reduction, while the computational cost is lower, compared with conventional ones.
The paper introduces the principle and structure of adaptive filter based on least mean square algorithm, studies a design scheme of a single frequency adaptive notch filter, and simulates its working procedure by Mat...
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ISBN:
(纸本)9783642217821
The paper introduces the principle and structure of adaptive filter based on least mean square algorithm, studies a design scheme of a single frequency adaptive notch filter, and simulates its working procedure by Mat lab programming and Simulink modeling. The simulation results show that the adaptive notch filters by two methods have filtered noise from noise added signal in the appropriate parameter.
In the present scenario of power system network, active filter are being designed using advanced technology for compensating harmonics and reactive power for better quality of power supply. The present paper implement...
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ISBN:
(纸本)9781538693155
In the present scenario of power system network, active filter are being designed using advanced technology for compensating harmonics and reactive power for better quality of power supply. The present paper implements a Shunt Hybrid Active Filter (SHAF), necessary for reactive power compensation in the nonlinear load and suppresses harmonics for improving the power quality (PQ) in the distribution network. In this work, an adaptive linear neuron (Adaline) based variable step size leaky least mean square (VSSLlms) control approach is applied for extracting harmonics. This competent approach is needed for generating the gating pulses essential for IGBT inverter and increasing the performance compared to the conventional Adaline-lms controller. The proposed controller provides faster convergence and also provides better performance compared to conventional one. Simulation results show the significant improvement in Adaline-VSSLlms approach compared to Adaline-lms approach. The simulations of the proposed controller and system is done using MATLAB/ SIMULINK under different load conditions.
Mass measurement system is required not only to be accurate but also to be efficient based on development of automations in industrial production lines. Since mass can be calculated with a resonant frequency of vibrat...
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ISBN:
(纸本)4907764227
Mass measurement system is required not only to be accurate but also to be efficient based on development of automations in industrial production lines. Since mass can be calculated with a resonant frequency of vibration, it is considered that the frequency estimation method using lms algorithm is applicable to a dynamic mass measurement. In this year, mass measurement is experimented for real time under the Windows environment when a measuring object is sliding on the goods stand. Considering two standard deviation of mass, the total accuracy of system is estimated at about 0.2%.
This paper presents a technique for background calibration of Pipeline ADCs with multi-bit stages, based on an adaptive approach. Different implementations Of the lms algorithm have been studied, concluding that the t...
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ISBN:
(纸本)076952009X
This paper presents a technique for background calibration of Pipeline ADCs with multi-bit stages, based on an adaptive approach. Different implementations Of the lms algorithm have been studied, concluding that the traditional SS-lms algorithm has inherent convergence problems in high accuracy ADCs that can be solved considering a SD-lms implementation.
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