Results 221 to 230 of about 148,419 (252)

A Novel ACO-OFDM System Based on Fast Walsh Hadamard Transform

2020 International Conference on Electrical, Communication, and Computer Engineering (ICECCE), 2020
Visible Light Communication (VLC), an alternative to radio frequency (RF), was born as a promising technology. In VLC systems, orthogonal frequency division multiplexing (OFDM) has received much attention due to its high data rate, simple equalization ...
Büsra Avci, Gazihan Aykiri, Kudret Karaerik, Elif Büsra Tuna, Sabiha Yaşar, Hayriye Sinop, Yusuf İslam Tek, A. Özen   +7 more
semanticscholar   +1 more source

A Novel Double Tree Complex Wavelet Transform OFDM Based on Fast Walsh Hadamard Transform

2020 International Conference on Electrical, Communication, and Computer Engineering (ICECCE), 2020
In this paper, combining with the fast Walsh Hadamard transform (FWHT) to improve the performance of the double-tree complex wavelet transform (DTCWT) based OFDM technique developed to eliminate the disadvantages of the orthogonal frequency division ...
Kudret Karaerik, Elif Büsra Tuna, Yusuf İslam Tek, Hayriye Sinop, Sabiha Yaşar, Büsra Avci, Gazihan Aykiri, A. Özen   +7 more
semanticscholar   +1 more source

Walsh–Hadamard Transforms: A Review

2017
Abstract The Walsh–Hadamard Transforms refer to a series of transforms related to Walsh functions and Hadamard matrix. These transforms have numerous applications in different areas of engineering and science. There are many versions of the Walsh–Hadamard Transform.
openaire   +2 more sources

A novel VLSI architecture for Walsh-Hadamard transform

2nd Asia Symposium on Quality Electronic Design (ASQED), 2010
In this paper, a novel VLSI architecture for one dimensional Walsh-Hadamard transform (WHT) is proposed. The core of the architecture is the HVMA (Hadamard Vector Merging Adder) that adds the products of input data words and transform (Hadamard) matrix elements in parallel using a (4:2) compressor based carry-save tree structure. The core also exploits
Hafizur Rahaman, Santi P. Maity, Sudip Ghosh, Somsubhra Talapatra   +3 more
openaire   +2 more sources

On some properties of Walsh-Hadamard transformed OFDM

Proceedings IEEE 56th Vehicular Technology Conference, 2003
We present our study on the signal properties of a Walsh Hadamard transformed (WHT) OFDM system, i.e., an OFDM system with a WHT implemented before the OFDM modulation. Starting from a linear algebraic model, we first derive the probability density function of the transmitted signal.
Sumei Sun, Chin Keong Ho, Yan Wu
openaire   +2 more sources

Modified Walsh-Hadamard Transform for PDL Mitigation

39th European Conference and Exhibition on Optical Communication (ECOC 2013), 2013
We propose a modified Walsh-Hadamard transform (MWHT) that reduces the PDL penalty by equalizing the performance of both polarization tributaries. The realization of MWHT requires just one piece of PMF and therefore exhibits a very low-cost PDL solution.
Takehiro Tsuritani, Itsuro Morita, Wei-Ren Peng   +2 more
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STC-GFDM systems with Walsh-Hadamard transform

2016 IEEE International Conference on Electronic Information and Communication Technology (ICEICT), 2016
Generalized Frequency Division Multiplexing (GFD-M) is a promising candidate waveform for the air interface of the fifth generation (5G) communication networks. The combination of GFDM and time-reversal space-time coding (TR-STC) can improve the bit error rate (BER) performance.
Wei Zhang, Zhimin Zhang, Lin Qi, Jipeng Jia   +3 more
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Fast Algorithm for Walsh Hadamard Transform on Sliding Windows

IEEE Transactions on Pattern Analysis and Machine Intelligence, 2010
This paper proposes a fast algorithm for Walsh Hadamard Transform on sliding windows which can be used to implement pattern matching most efficiently. The computational requirement of the proposed algorithm is about 1.5 additions per projection vector per sample, which is the lowest among existing fast algorithms for Walsh Hadamard Transform on sliding
Wai-Kuen Cham, Wanli Ouyang
openaire   +3 more sources

Fast Walsh–Hadamard transform and deep learning approach for diagnosing psychiatric diseases from electroencephalography (EEG) signals

Neural computing & applications (Print), 2023
H. Göker, Mustafa Tosun
semanticscholar   +1 more source

Efficient Encrypted Images Filtering and Transform Coding With Walsh-Hadamard Transform and Parallelization

IEEE Transactions on Image Processing, 2018
Since homomorphic encryption operations have high computational complexity, image applications based on homomorphic encryption are often time consuming, which makes them impractical. In this paper, we study efficient encrypted image applications with the
Peijia Zheng, Jiwu Huang
semanticscholar   +1 more source