On the design of multi notch filters

Deshpande, Rohini; Kumar, Bipin; Jain, Saurabh

doi:10.1002/cta.725

Cited by 13 publications

(13 citation statements)

References 14 publications

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“…The other studies utilized iterative clipping and filtering by placing IDFT and the DFT blocks many times in different locations within the OFDM system, hence, increasing the computational complexity. As examples of the filters, see . The performance of the CAC technique has been analyzed in the literature , so we will not concentrate on re‐producing such analysis in this paper.…”

Section: Cac Techniquementioning

confidence: 99%

Reducing the power envelope fluctuation of OFDM systems using side information supported amplitude clipping approach

Taher

Mandeep

Ismail

et al. 2013

Circuit Theory & Apps

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OFDM is an important modulation technique currently in development in the field of communications systems. OFDM signals can combat multipath propagation and fading channels and can support large data rates. However, OFDM systems are multicarrier systems and experience problems due to the required summation of sinusoids when the in‐phase subcarriers are combined, which produces high power peaks. The large power envelope fluctuations that occur at the output cause in‐band and out‐of‐band distortions that result in degraded BER performance. The literature contains many qualified approaches to resolving the peak‐to‐average power ratio problem, including selected mapping, partial transmit sequence, and amplitude clipping techniques. The simplest technique is the amplitude clipping technique, and the selected mapping and partial transmit sequence techniques are excessively complicated for real‐time implementation. In this paper, we suggest a modification to the amplitude clipping method to produce a novel clipping technique called the side information supported amplitude clipping (SI‐SAC) method. The SI‐SAC technique involves sending certain bits of extra information so that the receiver can recover all of the clipped data. The SI‐SAC technique does not add computational complexity to the system, and simulation results show that the proposed method is superior to the conventional method. The peak‐to‐average power ratio was reduced by ≈2.5 dB, and the magnitude of the mean squared error vector is the same as that of the original signal that is not clipped. In contrast, the conventional amplitude clipping method produces a mean squared error vector with a large magnitude. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Cac Techniquementioning

confidence: 99%

Reducing the power envelope fluctuation of OFDM systems using side information supported amplitude clipping approach

Taher

Mandeep

Ismail

et al. 2013

Circuit Theory & Apps

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“…Conclusions are presented in Section VI. The filter considered in this paper is based on the timevarying notch filter proposed in [12], [13]. The IIR prototype filter design with zero-pole placement can be achieved as follows.…”

Section: Introductionmentioning

confidence: 99%

“…In order to obtain time-varying notch filter, the transfer function given by (1) can be rewritten in the presented as follows [13]:…”

Section: Introductionmentioning

confidence: 99%

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Time-varying FIR notch filter implementation using Raspberry Pi

Kocon

Piskorowski

2015

2015 20th International Conference on Methods and Models in Automation and Robotics (MMAR)

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In this paper a hardware implementation of the finite impulse response narrow band-stop time-varying filter based on the infinite impulse prototype filter is proposed. The notch filter is used for removing power-line interferences from biomedical source, i.e. ECG signal. In order to suppress the transient state of the proposed filter, the pole radius and the pole angle of the prototype filter are temporarily varied in time. The proposed filters are tested using sinusoidal and ECG signals. The algorithm for computing the filter coefficients is presented. Computer simulations, and performance indexes demonstrate that the proposed filter possesses better properties than traditional timeinvariant notch filter. Moreover, the hardware implementation of the presented filter using Raspberry Pi platform has been presented.

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“…Adaptive second-order notch filters with fast convergence rate are designed in [12] and [13]. In addition, multiple notch filters are used for the removal of multiple narrow-band or multiple frequency interference in [14] and [15]. It can be noticed that the aforementioned notch filters require the disturbance frequencies exactly known or might slightly differ from the assumed value.…”

mentioning

confidence: 99%

Analysis and Suppression of the Suspended Rotor Displacement Fluctuation Influence for Motor System

Zhou¹,

Fang

2014

IEEE Trans. Ind. Electron.

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Suspended rotor displacement fluctuation would result in unbalanced magnetic pull and inaccurate speed measurement, which degrades the suspended rotor stability and motor performance. In order to reduce the blight, some research studies have been conducted. First, the influence on the motor magnetic field has been analyzed between motors with iron-cored and coreless stator structures. It is found that with the coreless stator, the air-gap magnetic flux density variation can be neglected. Second, the law of the speed fluctuation caused by the rotor runout has been studied. In addition, two methods, which are based on the use of notch filter and speed correction, have been proposed for suppressing the fluctuation. Third, the performances of the closed-loop systems with the proposed speed fluctuation suppression methods have been analyzed. Finally, experimental results are presented to demonstrate the correctness of the analysis and the validity of the proposed methods.

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On the design of multi notch filters

Cited by 13 publications

References 14 publications

Reducing the power envelope fluctuation of OFDM systems using side information supported amplitude clipping approach

Reducing the power envelope fluctuation of OFDM systems using side information supported amplitude clipping approach

Time-varying FIR notch filter implementation using Raspberry Pi

Analysis and Suppression of the Suspended Rotor Displacement Fluctuation Influence for Motor System

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