Evolution of Orthogonal Frequency Division Multiplexing Modulation to Discrete Wavelet Multitone

2011 ◽  
Author(s):  
Tabassum Nawaz Bajwa ◽  
Arsla Khan ◽  
Sobia Baig
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Discrete Wavelet ◽  
Frequency Division Multiplexing ◽  
Frequency Division

scholarly journals Study of the Discrete Wavelet Transform Based Designed System Under Different Simulation Conditions

2020 ◽  
Vol 14 ◽  
Keyword(s):  
Signal Processing ◽  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Amplitude Modulation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Pulse Amplitude ◽  
Discrete Wavelet ◽  
Pulse Amplitude Modulation ◽  
Frequency Division Multiplexing ◽  
Frequency Division

Wavelet Transforms is an Important Part of, Systems Theory and Signal Processing and finds numerous important applications in Science and Engineering. In this paper, we investigated the performance of proposed scheme coded Discrete wavelet transform based Orthogonal frequency division multiplexing scheme over Additive white Gaussian noise channel using Pulse Amplitude Modulation in terms of Energy bits per noise ratio values. The simulation has been done using MATLAB software and results are compared with ½ rate convolution coded Discrete wavelet transform based Orthogonal frequency division multiplexing system. It is found by MATLAB simulations that the performance of proposed scheme coded Discrete wavelet transform based Orthogonal frequency division multiplexing outperforms than that of ½ rate convolution encoded Discrete wavelet transform based Orthogonal frequency division multiplexing with 16-Pulse Amplitude Modulation. Along with this, different orders of reverse biorthogonal and biorthogonal wavelets are implemented to simulate the proposed system with 16-Pulse Amplitude Modulation scheme. The performance of proposed system is compared and it is found that proposed system performs better than conventional system under all different simulation conditions. This study finds important applications in Signal Processing.

scholarly journals PERBANDINGAN POWER SPECTRAL DENSITY SISTEM OWDM DAN OFDM PADA KANAL RAYLEIGH

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Yuyun Siti Rohmah ◽  
Ali Muayyadi ◽  
Rina Pudji Astuti
Keyword(s):  
Wavelet Transform ◽  
Spectral Density ◽  
Discrete Wavelet Transform ◽  
Power Spectral Density ◽  
Orthogonal Frequency Division Multiplexing ◽  
Discrete Wavelet ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Orthogonal Wavelet ◽  
Power Spectral

OFDM (Orthogonal Frequency Division Multiplexing) merupakan teknik modulasi multicarrier untuk mengatasi permasalahan kanal multipath seperti frekuensi selektif fading. Orthogonalitas pada sistem OFDM menghasilkan banyak sub-carrier yang dapat ditransmisikan secara bersamaan pada spektrum frekuensi yang terbatas tanpa saling berinterferensi. Efesiensi bandwidth didapat karena masing-masing sub-carrier saling orthogonal sehingga antara sub-carrier yang berdekatan dapat dibuat overlapping. OWDM (Orthogonal wavelet division multiplex) merupakan suatu sistem multicarrier alternatif dariOFDM dan telah diteliti sebagai kandidat yang dapat diaplikasikan pada wirelesscommunication. Sistem OWDM menggunakan Inverse Discrete wavelet transform (IDWT) sebagai pembangkit subcarrier-subcarrier yang saling orthogonal dan berfungsi sebagai modulator. Sedangkan DWT (Discrete Wavelet Transform) digunakan sebagai demodulator. Penelitian ini membandingkan power spectral density dari sistem OWDM dan OFDM. Dari hasil simulasi perbandingan power spectral density (PSD) didapatkan bahwa PSD darimasing-masing sistem sama. Pada OWDM, pembagian band frekuensi untuk setiap sub-band berbeda kecuali sub-band pada level yang sama. Semakin tinggi level sub-band maka semakin lebar band frekuensinya.

scholarly journals Performance investigation of WOFDM for 5G wireless networks

2019 ◽  
Vol 9 (4) ◽  
pp. 3153
Author(s):  
M. F. Ghanim
Keyword(s):  
Wireless Networks ◽  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Orthogonal Frequency Division Multiplexing ◽  
Original System ◽  
Discrete Wavelet ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Ofdm System

<p>Nowadays, emerging wireless networks scenarios such as the proposed systems for 5G is discussed widely with diverse requirements. Orthogonal Frequency Division Multiplexing (OFDM) is a conservative proposal which is used to build 5G WOFDM system (Wavelet OFDM system). The simulation of the system is initialized with BPSK then with QAM and 64-QAM the system is improved by increasing the number of levels of Discrete Wavelet Transform to five levels and finally compared with original system to prove that the it is convenient for 5G Wireless networks.</p>

scholarly journals Lucas Algorithm for Medical Images Encryption and Transmission using Orthogonal Frequency Division Multiplexing for Medical Health Information Systems and its VLSI Realization

2021 ◽  
Vol 17 (06) ◽  
pp. 128
Author(s):  
Gangadhar Ch ◽  
Md Habibulla
Keyword(s):  
Wavelet Transform ◽  
Information Systems ◽  
Health Information ◽  
Image Encryption ◽  
Orthogonal Frequency Division Multiplexing ◽  
Medical Images ◽  
Health Information Systems ◽  
Discrete Wavelet ◽  
Frequency Division Multiplexing ◽  
Frequency Division

<p>Security of medical images is critical for transmission of medical images and relevant patient information through public health information systems networks. Image encryption is an important tool for protecting Medical images by converting them into unrecognisable formats for the transmission and receiption of medical images.  This paper proposes an algorithm for medical image encryption using Lucas Algorithm, and a discrete wavelet transform based transmission and reception technique, which is known as orthogonal frequency division multiplexing(OFDM). This paper presents an implementation of Lucas Algorithm for image encryption and combines it with Discrete wavelet transform orthogonal frequency division multiplexing using Field Programmable Gate Array.</p>

Sign in / Sign up

Export Citation Format

Share Document