Results 31 to 40 of about 275 (168)

Two novel nonlinear companding schemes with iterative receiver to reduce PAPR in multi-carrier modulation systems

, 2006
Companding transform is an efficient and simple method to reduce the Peak-to-Average Power Ratio (PAPR) for Multi-Carrier Modulation (MCM) systems.
Guo, P, Yao, W, Qu, D, Song, Y, Jiang, T
core   +1 more source

Companding Schemes for Reducing PAPR in OFDM System: A Review

, 2020
High PAPR poses a large hindrance to high data rate Orthogonal Frequency Division Multiplexing (OFDM) signals. A companding transform converts the Probability distribution function (PDF) of the transmitted OFDM signal in a way which reduces the Peak-to ...
Ashish Goel, Prateek Mathur
core   +1 more source

CRLB for joint estimation of TDOA, phase, FDOA, and Doppler rate

The Journal of Engineering, Volume 2019, Issue 21, Page 7628-7631, November 2019., 2019
To avoid decline of FDOA estimation precision caused by relative Doppler companding, Doppler rate has to be considered and estimated jointly with TDOA, phase, and FDOA. However, CRLB of the joint estimation is still unclear. This study addresses on derivation of the CRLB. First, the joint estimation model is constructed.
Dexiu Hu, Shiwen Chen, Hang Bai, Chuang Zhao, Liping Luo   +4 more
wiley   +1 more source

PAPR reduction in OFDM using scaled particle swarm optimisation based partial transmit sequence technique

The Journal of Engineering, Volume 2019, Issue 5, Page 3460-3468, May 2019., 2019
Partial transmit sequence (PTS) is one of the effective techniques for reducing the peak‐to‐average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. PTS technique has some issues such as higher computational complexity due to its exhaustive searching of optimal phase factors.
Sanjana Prasad, Ramesh Jayabalan
wiley   +1 more source

Piecewise-linear companding transform for peak-to-average power ratio reduction of OFDM signals

Tongxin xuebao, 2011
In order to reduce the peak-to-average power ratio（PAPR） of orthogonal frequency division multiplexing（OFDM） signals,a piecewise-linear companding transform was proposed.Small amplitudes were multiplied by a scale factor,while large ones were not only ...
YANG Pin-lu, HU Ai-qun
doaj   +2 more sources

Discrete Cosine Transform Matrix Based SLM Algorithm for OFDM with Diminished PAPR for M‐PSK over Different Subcarriers

Journal of Computer Networks and Communications, Volume 2019, Issue 1, 2019., 2019
Orthogonal frequency division multiplexing (OFDM) is the highly spectrally well‐organized method that has the difficulty of excessive peak power to average power ratio (PAPR), which ultimately imposes constraints on the high‐power amplifier. Many practices have been projected to lessen PAPR of the OFDM systems.
Prabal Gupta, Rajiv Kumar Singh, H. Pal Thethi, Balpreet Singh, Santosh Kumar Nanda, Giovanni Pau   +5 more
wiley   +1 more source

PSO Algorithm on PAPR Reduction Performance of Asymmetrically Clipped Optical‐OFDM

Applied Computational Intelligence and Soft Computing, Volume 2026, Issue 1, 2026.
This research presents a novel hybrid optimization framework combining artificial neural networks (ANN) and particle swarm optimization (PSO) to mitigate the high peak‐to‐average power ratio (PAPR) in asymmetrically clipped optical‐orthogonal frequency division multiplexing (ACO‐OFDM) systems. While conventional PTS effectively reduces PAPR, it suffers
Hermansyah Alam, Anuar Mat Safar, Norizan Mohamed Nawawi, Mohd Nordin Junita, Aymen Abdalmunam Hameed, Ridha Ejbali   +5 more
wiley   +1 more source

Speech Technology Progress Based on New Machine Learning Paradigm

Computational Intelligence and Neuroscience, Volume 2019, Issue 1, 2019., 2019
Speech technologies have been developed for decades as a typical signal processing area, while the last decade has brought a huge progress based on new machine learning paradigms. Owing not only to their intrinsic complexity but also to their relation with cognitive sciences, speech technologies are now viewed as a prime example of interdisciplinary ...
Vlado Delić, Zoran Perić, Milan Sečujski, Nikša Jakovljević, Jelena Nikolić, Dragiša Mišković, Nikola Simić, Siniša Suzić, Tijana Delić, Paolo Gastaldo   +9 more
wiley   +1 more source

Reduction of peak-to-average power ratio for FBMC/OQAM signals under the general linear non-symmetrical companding transform with a Laplace distribution

ICT Express
The filter bank multi-carrier with offset quadrature amplitude modulation (FBMC/OQAM) is extensively utilized in communication scenarios characterized by severe Doppler interference, owing its remarkable ability for precise time–frequency positioning ...
Xinyu Liu, Hongkun Zhou, Xiyun Ge, Miao Yu, Lei Liu   +4 more
doaj   +1 more source

Reducing the Peak to Average Power Ratio of UFMC Waveform for Beyond 5G System Using Hybrid SLM+PTS+RNN Algorithms

IET Communications, Volume 19, Issue 1, January/December 2025.
This article proposes a hybrid SLM+PTS+RNN algorithm to mitigate the high PAPR challenge in UFMC systems for B5G networks. The method significantly improves power efficiency (by 30%–40%) while maintaining BER and PSD performance, outperforming traditional PAPR reduction techniques.
Arun Kumar, Nishant Gaur, Aziz Nanthaamornphong   +2 more
wiley   +1 more source