Results 91 to 100 of about 4,861 (197)

A Method for Diagnosing Gearboxes of Means of Transport Using Multi-Stage Filtering and Entropy

Entropy, 2019
The paper presents a method of processing vibration signals which was designed to detect damage to wheels of gearboxes for means of transport. This method uses entropy calculation, and multi-stage filtering calculated by means of digital filters and the ...
Tomasz Figlus
doaj   +1 more source

Walsh - Hadamard Transformation of a Convolution

Radioengineering, 2002
A convolution is mathematical operation used in signal processing,in the homomorphous signal processing and digital image processing(e.g. image interpolation). In regard of computational complexity ofthe convolution in the time domain, it used to calculate in the otherdomain. Exp. x(n) * h(n) R X(W) × H(W), resp.
Usakova, A., Kotuliakova, J., Zajac, M.
openaire   +2 more sources

A NEW DISCRETE HARTLEY TRANSFORM PRECODING BASED INTERLEAVED-OFDMA UPLINK SYSTEM WITH REDUCED PAPR FOR 4G CELLULAR NETWORKS [PDF]

Journal of Engineering Science and Technology, 2011
High peak-to-average power ratio (PAPR) reduction is one of the major challenges in orthogonal frequency division multiple access (OFDMA) systems since last decades. High PAPR increases the complexity of analogue-to-digital (A/D) and digital-to-analogue (
VARUN JEOTI, IMRAN BAIG
doaj  

Universal Joint Maximum Likelihood Frame Synchronization and PLS Decoding for DVB-S2X Systems

Signals
Compared to DVB-S2, DVB-S2X features a more intricate signaling structure. These signaling fields are employed not only in standard frames but are also frequently utilized within superframe structures.
Xin-Qi Liao, Yih-Min Chen
doaj   +1 more source

Improving bit error rate in optical wireless OFDM systems through hybrid companding and precoding strategies

EURASIP Journal on Wireless Communications and Networking
Visible light communication (VLC) is a promising wireless high-data-rate transmission technology that uses visible light. Optical Orthogonal Frequency Division Multiplexing (OOFDM)-based systems, especially asymmetrically clipped optical OFDM (ACO-OFDM),
Amal Yasser, Albashir A. Youssef, Mohamed Abaza   +2 more
doaj   +1 more source

Deconstructing taxa x taxa xenvironment interactions in the microbiota: A theoretical examination. [PDF]

iScience, 2023
Yitbarek S, Guittar J, Knutie SA, Ogbunugafor CB.   +3 more
europepmc   +1 more source

Efficient Quantum Transforms

, 1997
Quantum mechanics requires the operation of quantum computers to be unitary, and thus makes it important to have general techniques for developing fast quantum algorithms for computing unitary transforms.
Hoyer, Peter
core   +2 more sources

Optimizing the ordering of the Hadamard masks of ghost imaging suitable for the efficient face reconstruction using the max-projection method. [PDF]

Sci Rep, 2023
Zhang H, Du K, Zhao C, Tang J, Si S, Jia W, Xue L, Li Z.   +7 more
europepmc   +1 more source

Image encryption technique using walsh transform and chaotic systems

Discover Electronics
The surge of digital infrastructures demands robust and efficient image encryption schemes to ensure privacy and security. This paper presents a lightweight image encryption scheme that integrates the Walsh Hadamard Transform (WHT) with chaos-driven ...
Adesh Kumar, Jaishree
doaj   +1 more source

Sparsity of higher-order landscape interactions enables learning and prediction for microbiomes. [PDF]

Proc Natl Acad Sci U S A, 2023
Arya S, George AB, O'Dwyer JP.
europepmc   +1 more source