Results 41 to 50 of about 275 (168)

Theoretical and Experimental Investigation of Direct Detection Optical OFDM Systems with Clipping and Normalization

Journal of Electrical and Computer Engineering, Volume 2018, Issue 1, 2018., 2018
A data clipping and normalization technique is employed to improve the performance of the overall direct detection optical orthogonal frequency division multiplexing (DCO‐OFDM) system. A detailed analysis of clipping distortion introduced by digital clipping and normalization is provided. The normalization operation amplifies the clipped data signal to
Jiang Wu, Zhongpeng Wang, Jit S. Mandeep
wiley   +1 more source

Transmit power imbalance reduction method and nonlinear companding transform for beamforming OFDM systems

ICT Express, 2019
Due to large peak-to-average power ratio (PAPR) at the time domain OFDM signal, various peak signal reduction methods for OFDM systems have been proposed.
Satoshi Taroda, Ken Tezuka, Shoichi Higuchi, Chang-Jun Ahn, Kazuki Maruta   +4 more
doaj   +1 more source

Non‐linear companding transform for DCO‐OFDM‐based VLC systems [PDF]

IET Communications, 2019
In this study, a novel non‐linear companding transform (NCT) is proposed for the DC‐biased optical orthogonal frequency division multiplexing (DCO‐OFDM) based visible light communications (VLC). The authors lower the peak‐to‐average power ratio (PAPR) of the original DCO‐OFDM signals to mitigate the transmission performance ...
Duqiang Xin, Qiang Xu, Shuang Qiao, Tian Zhang 0026   +3 more
openaire   +1 more source

A Beyond 5G OTFS Waveform Radio for Smart Hospital: PAPR Reduction in OTFS Using the Cuckoo Search–Based PTS Method

Journal of Electrical and Computer Engineering, Volume 2025, Issue 1, 2025.
Smart hospitals have enormous potential to improve global standards of medical services. Integrating fifth‐generation (5G) and beyond 5G radio with the present healthcare framework can make hospitals smarter. High spectral access, data rate, capacity, low latency, and large data handling are requirements of innovative hospitals.
Arun Kumar, Aziz Nanthaamornphong, Shonak Bansal   +2 more
wiley   +1 more source

Experimental Investigation of Zadoff‐Chu Matrix Precoding for Visible Light Communication System with OFDM Modulation

Advances in Condensed Matter Physics, Volume 2018, Issue 1, 2018., 2018
Light‐emitting diode‐ (LED‐) based visible light communication (VLC) has become a potential candidate for next generation high‐speed indoor wireless communication. Due to the limited modulation bandwidth of the LED, orthogonal frequency division multiplexing (OFDM) modulation is particularly preferred in the VLC system to overcome the ISI, which ...
Xinyue Guo, Yang Guo, Shuangshuang Li, Shuqing Chen   +3 more
wiley   +1 more source

A low-complexity companding transform for peak-to-average power ratio reduction in OFDM systems

, 2009
[[abstract]]© 2006 Institute of Electrical and Electronics Engineers - The high peak-to-average power ratio (PAPR) feature is one main drawback associated with orthogonal frequency division multiplexing (OFDM) systems.
Wang,Chin-Liang;Ku,Sheng-Ju
core   +1 more source

A PAPR correction scheme for LoRa self‐jamming waveforms

IET Communications, Volume 18, Issue 19, Page 1588-1603, December 2024.
A self‐jamming scheme of LoRa waveforms enabling secure transmissions is recently proposed in literature, which performs well in simulations. However, experiments on SDR equipment immediately showed that a transmission is impossible due to PAPR introduced by the waveform modification.
Clément Demeslay, Roland Gautier, Philippe Rostaing, Angela Digulescu, Cristina Despina‐Stoian, Gilles Burel   +5 more
wiley   +1 more source

Iterative Receiver with Low Complexity for Downlink Multicarrier Communications over Rapidly Time‐Varying Channels

Wireless Communications and Mobile Computing, Volume 2018, Issue 1, 2018., 2018
This study proposes an iterative, joint channel estimation, equalization, and data detection method in the presence of high mobility for a multicarrier downlink system that communicates over rapidly time‐varying channels. The proposed method uses a basis expansion method (BEM) which has low computational complexity and helps to reduce the number of ...
Nihat Kabaoglu, Eylem Erdogan, Erdogan Aydin, Simone Morosi   +3 more
wiley   +1 more source

Companding transform based SPM compensation in coherent optical OFDM transmission

Optics Express, 2011
We demonstrate a mitigation of fiber nonlinearity based on μ-law companding transform in coherent optical OFDM transmissions. High peak-to-average power ratio (PAPR) increases fiber nonlinear impairments caused by the Kerr effect in optical fiber. The μ-law companding modifies amplitude profile of OFDM signal with time domain signal processing, which ...
Hwan Seok, Chung, Sun Hyok, Chang, Kwangjoon, Kim   +2 more
openaire   +2 more sources

Pre‐Flight and In‐Flight Calibration and Performance of the Terminal Tracking Cameras (TTCams) on the NASA Lucy Mission

Earth and Space Science, Volume 11, Issue 8, August 2024.
Abstract The Terminal Tracking Camera (TTCam) imaging system on the NASA Lucy Discovery mission consists of a pair of cameras that are being used mainly as a navigation and target acquisition system for the mission's asteroid encounters. However, a secondary science‐focused function of the TTCam system is to provide wide‐angle broadband images over a ...
Y. Zhao, J. F. Bell III, E. Sahr, E. Lessac‐Chenen, C. Adam, E. Cisneros, A. Winhold, M. Caplinger, M. Ravine, J. Schaffner, J. Shamah, S. Mottola   +11 more
wiley   +1 more source