PAPR reduction of optical OFDM signals in visible light communications
ICT Express, 2019 Orthogonal frequency division multiplexing (OFDM) is extensively used in optical communications to achieve high rate transmission. In this paper, Vandermonde like matrix (VLM) pre-coding approach is offered to reduce the high peak-to-average power ratio (
Abbas Ali Sharifi
doaj
Characterizing and Enumerating Walsh-Hadamard Transform Algorithms
, 2017 We propose a way of characterizing the algorithms computing a Walsh-Hadamard transform that consist of a sequence of arrays of butterflies ($I_{2^{n-1}}\otimes \text{DFT}_2$) interleaved by linear permutations. Linear permutations are those that map linearly the binary representation of its element indices.
Serre, François, Püschel, Markus
openaire +2 more sources
The Cascading Haar Wavelet Algorithm for Computing the Walsh–Hadamard Transform [PDF]
IEEE Signal Processing Letters, 2017 We propose a novel algorithm for computing the Walsh-Hadamard Transform (WHT) which consists entirely of Haar wavelet transforms. We prove that the algorithm, which we call the Cascading Haar Wavelet (CHW) algorithm, shares precisely the same serial complexity as the popular divide-and-conquer algorithm for the WHT.
openaire +3 more sources
Symmetry, 2019 Proof of ownership on multimedia data exposes users to significant threats due to a myriad of transmission channel attacks over distributed computing infrastructures.
Tahmina Khanam +3 more
semanticscholar +1 more source
THE PERFORMANCE ANALYSIS OF PRECODED SPACE-TIME FREQUENCY MIMO-GFDM OVER RAYLEIGH FADING CHANNELS [PDF]
Journal of Mechanics of Continua and Mathematical SciencesThe physical layer is implemented in the present communication era with new multicarrier modulation schemes such as Generalized Frequency Division Multiplexing with Multi-Input and Multi-Output (MIMO-GFDM) antenna systems to achieve good spectral ...
R. Anil Kumar +4 more
doaj +1 more source
Deconstructing taxa x taxa xenvironment interactions in the microbiota: A theoretical examination. [PDF]
iScience, 2023 Yitbarek S +3 more
europepmc +1 more source
A Proposed SAFER Plus Security algorithm using Fast Walsh Hadamard transform for Bluetooth Technology [PDF]
, 2009 R.Neelaveni D.Sharmila
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Multiscaled wavelet transforms, ridgelet transforms, and Radon transforms on the space of matrices [PDF]
arXiv, 2004 Let $M$ be the space of real $n\times m$ matrices which can be identified with the Euclidean space $R^{nm}$. We introduce continuous wavelet transforms on $M$ with a multivalued scaling parameter represented by a positive definite symmetric matrix. These transforms agree with the polar decomposition on $M$ and coincide with classical ones in the rank ...
arxiv
International Journal of Engineering Science and Technology, 2019 This study proposes a discrete Walsh Hadamard transform (DWHT) based protection technique for the detection of fault and identification of faulty phase in series capacitor compensated three phase transmission line connected with distributed generation ...
Gaurav Kapoor
semanticscholar +1 more source
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 +7 more
europepmc +1 more source