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

Avcı, Büşra; Aykiri, Gazihan; Karaerik, Kudret; Tuna, Elif Busra; Yasar, Sabiha; Sinop, Hayriye; Tek, Yusuf Islam; Özen, Ali

doi:10.1109/icecce49384.2020.9179203

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…After analyzing the frequency domain at the receiver, it was observed that the negative clipping noise only affected the even subcarriers. Consequently, after removing the CP, the signal is parallelized, and the transmitted signal on the odd subcarriers is readily retrieved at the receiver by a simple FFT process [28].…”

Section: ⌊𝑥 (𝑛)⌋ = 𝑥(𝑛) + 𝑖(𝑛) =mentioning

confidence: 99%

Optical-OFDM VLC System: Peak-to-Average Power Ratio Enhancement and Performance Evaluation

A. Zenhom,

Hamad,

Alghassab

et al. 2024

Sensors

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Visible Light Communication (VLC) systems are favoured for numerous applications due to their extensive bandwidth and resilience to electromagnetic interference. This study delineates various constructions of Optical Orthogonal Frequency Division Multiplexing (O-OFDM) approaches employed in VLC systems. Various factors are elaborated within this context to ascertain a more effective O-OFDM approach, including constellation size, data arrangement and spectral efficiency, power efficiency, computational complexity, bit error rate (BER), and peak-to-average power ratio (PAPR). This paper seeks to assess these approaches’ BER and PAPR performance across varying modulation orders. Regrettably, in VLC systems based on OFDM methodology, the superposition of multiple subcarriers results in a high PAPR. Therefore, this study aims to diminish the PAPR in VLC systems, enhancing system performance. We propose a non-distorting PAPR reduction technique, namely the Vandermonde-Like Matrix (VLM) precoding technique. The suggested technique is implemented across various O-OFDM approaches, including DCO-OFDM, ADO-OFDM, ACO-OFDM, FLIP-OFDM, ASCO-OFDM, and LACO-OFDM. Notably, this method does not affect the system’s data rate because it does not require the mandatory transmission of side information. Furthermore, this technique can decrease the PAPR without impacting the system’s BER performance. This study compares the proposed PAPR reduction technique against established methods documented in the literature to evaluate their efficacy and validity rigorously.

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Section: ⌊𝑥 (𝑛)⌋ = 𝑥(𝑛) + 𝑖(𝑛) =mentioning

confidence: 99%

Optical-OFDM VLC System: Peak-to-Average Power Ratio Enhancement and Performance Evaluation

A. Zenhom,

Hamad,

Alghassab

et al. 2024

Sensors

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“…Additionally, the DHT has the self-inverse characteristic, which means that except for the scale factor, the same algorithm is used for forward and inverse [16], [17], [19]. Another essential member of orthogonal transforms is the Walsh-Hadamard transform (WHT), a common tool in a wide range of applications [3], [5], [8], [20]- [23]. WHT's key distinguishing feature is that its computation does not include any multiplication or division.…”

Section: Introductionmentioning

confidence: 99%

New fast Walsh–Hadamard–Hartley transform algorithm

Mardan

Hamood

2023

IJECE

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<span lang="EN-US">This paper presents an efficient fast Walsh–Hadamard–Hartley transform (FWHT) algorithm that incorporates the computation of the Walsh-Hadamard transform (WHT) with the discrete Hartley transform (DHT) into an orthogonal, unitary single fast transform possesses the block diagonal structure. The proposed algorithm is implemented in an integrated butterfly structure utilizing the sparse matrices factorization approach and the Kronecker (tensor) product technique, which proved a valuable and fast tool for developing and analyzing the proposed algorithm. The proposed approach was distinguished by ease of implementation and reduced computational complexity compared to previous algorithms, which were based on the concatenation of WHT and FHT by saving up to 3N-4 of real multiplication and 7.5N-10 of real addition.</span>

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

Cited by 2 publications

References 7 publications

Optical-OFDM VLC System: Peak-to-Average Power Ratio Enhancement and Performance Evaluation

Optical-OFDM VLC System: Peak-to-Average Power Ratio Enhancement and Performance Evaluation

New fast Walsh–Hadamard–Hartley transform algorithm

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