Research of Denoising Technology about Wavelet Analysis with Wiener Filter

2013 ◽  
Vol 333-335 ◽  
pp. 597-600
Author(s):  
Yao Bin Hu ◽  
Liang Bin Hu ◽  
Qiang Cheng
Keyword(s):  
Signal Processing ◽  
Wavelet Analysis ◽  
White Noise ◽  
Frequency Spectrum ◽  
Wiener Filter ◽  
Power Line ◽  
Wiener Filtering ◽  
Power Line Communication ◽  
Denoising Method

Interfering noise of power line is one of the important factors which affects the quality of power line communication (PLC). Its frequency spectrum has the character of the 1/f process and the great autocorrelation. The wavelet analysis is an important signal-processing tool. Selecting suitable wavelet analysis can turn non-white noise to white noise, followed by wiener filtering, we can achieve the purpose of denoising. This paper introduces a denoising method of combining wavelet analysis with wiener filtering. Experiment proves this method has a strong feasibility and practical value.

Implementasi Komunikasi Data Menggunakan Sistem PLC (Power Line Communication)

2021 ◽  
Vol 22 (1) ◽  
pp. 43
Author(s):  
Muhammad Helmi Sukoco ◽  
Gunawan Wibisono ◽  
Kukuh Nugroho
Keyword(s):  
Quality Of Service ◽  
Packet Loss ◽  
Wireless Lan ◽  
Power Line ◽  
Power Line Communication ◽  
Delay Jitter

Kabel listrik berfungsi untuk menyalurkan energi listrik ke peralatan listrik yang sering digunakan di kehidupan sehari – hari. Namun dalam pemanfaatannya kurang maksimal karena hanya digunakan sebagai penghantar arus listrik saja, padahal dapat digunakan sebagai Komunikasi data antar perangkat seperti komputer, handphone dan perangkat mobile lainnya. Teknologi yang menerapkan sistem dimana memanfaatkan kabel listrik sebagai Komunikasi data yang biasa disebut dengan Power Line Communication (PLC). Dalam penelitian ini dilakukan Implementasi sistem PLC dalam membangun sebuah jaringan menggunakan media kabel listrik untuk menghubungkan beberapa perangkat jaringan tanpa memerlukan instalasi baru karena jalur yang digunakan sudah terdistribusi di setiap tempat menggunakan perangkat powerline, serta menggunakan perangkat jaringan yang terhubung secara wireless ke perangkat mobile pada Jaringan wireless LAN (WLAN). Sistem PLC diterapkan pada tiga kali Pengujian, diantaranya membandingkan sistem PLC dengan tanpa sistem PLC, diterapkan berdasarkan jarak serta berdasarkan beban listrik yang diterapkan. Tiga Pengujian yang dilakukan dilihat berdasarkan parameter Quality of Service (QoS) seperti throughput, delay, jitter dan packet loss. Pada pengujian antara sistem PLC menghasilkan kinerja QoS lebih baik dibandingkan tanpa PLC, kemudian untuk pengujian bedasarkan jarak menghasilkan QoS yang baik walaupun cenderung konstan serta pengujian berdasarkan beban listrik menghasilkan QoS yang baik meskipun cenderung konstan.

Image De-Noising Method with Noise Control Materials Based on Wavelet Transform and Wiener Filter

2012 ◽  
Vol 459 ◽  
pp. 219-223
Author(s):  
Yuan Mei Wang ◽  
Tao Li
Keyword(s):  
Wavelet Transform ◽  
Image Quality ◽  
White Noise ◽  
Noise Control ◽  
Gaussian White Noise ◽  
Wiener Filter ◽  
Experimental Results ◽  
Wiener Filtering ◽  
High Image Quality ◽  
Image Edges

When image with Gaussian white noise being de-noised by wavelet threshold, there are some problems such as blurring and the loss of details of edges of image. To solve above problems, image de-noising method based on wavelet transform and Wiener filtering is proposed in the paper, first using wavelet threshold to de-noise, and then using Wiener filter to smooth the image so as to get high image quality. Experimental results show that this algorithm on de-noising proposed not only can effectively suppress Gaussian white noise, but also can well preserve the details of image edges

Research on Denoising of GPS Data Based on Nonlinear Wavelet Transform Threshold Method

2012 ◽  
Vol 446-449 ◽  
pp. 926-936
Author(s):  
De Bao Yuan ◽  
Xi Min Cui ◽  
Guo Wang ◽  
Jing Jing Jin ◽  
Wan Yang Xu
Keyword(s):  
Signal Processing ◽  
Wavelet Transform ◽  
Wavelet Analysis ◽  
Wavelet Denoising ◽  
Systematic Research ◽  
Gps Data ◽  
Signal Denoising ◽  
Threshold Method ◽  
Denoising Method

Signal denoising is one of the classic problems in the field of signal processing. As a new kind of signal processing tool, the good denoising performance of wavelet analysis has caused public growing concern and attention. The paper does systematic research on nonlinear wavelet threshold denoising method. And the wavelet denoising method has been used on GPS signal, and good results have been achieved.

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