Results 1 to 10 of about 148,430 (260)
Coded Index Modulation for Non-DC-Biased OFDM in Multiple LED Visible Light Communication [PDF]
arXiv, 2015 Use of multiple light emitting diodes (LED) is an attractive way to increase spectral efficiency in visible light communications (VLC). A non-DC-biased OFDM (NDC OFDM) scheme that uses two LEDs has been proposed in the literature recently. NDC OFDM has been shown to perform better than other OFDM schemes for VLC like DC-biased OFDM (DCO OFDM) and ...
Alaka, S. P. +2 more
arxiv +3 more sources
EVM and Achievable Data Rate Analysis of Clipped OFDM Signals in Visible Light Communication [PDF]
EURASIP Journal on Wireless Communications and Networking 2012,
2012:321, 2012 Orthogonal frequency division multiplexing (OFDM) has been considered for visible light communication (VLC) thanks to its ability to boost data rates as well as its robustness against frequency-selective fading channels. A major disadvantage of OFDM is the large dynamic range of its time-domain waveforms, making OFDM vulnerable to nonlinearity of light
D O’Brien +30 more
arxiv +5 more sources
A Comparison of CP-OFDM, PCC-OFDM and UFMC for 5G Uplink Communications [PDF]
arXiv, 2018 Polynomial-cancellation-coded orthogonal frequency division multiplexing (PCC-OFDM) is a form of OFDM that has waveforms which are very well localized in both the time and frequency domains and so it is ideally suited for use in the 5G network. This paper analyzes the performance of PCC-OFDM in the uplink of a multiuser system using orthogonal ...
Armstrong, Jean +3 more
arxiv +3 more sources
Flip-OFDM for Optical Wireless Communications [PDF]
, 2011 We consider two uniploar OFDM techniques for optical wireless communications: asymmetric clipped optical OFDM (ACO-OFDM) and Flip-OFDM. Both techniques can be used to compensate multipath distortion effects in optical wireless channels. However, ACO-OFDM has been widely studied in the literature, while the performance of Flip-OFDM has never been ...
Fernando, Nirmal +2 more
arxiv +5 more sources
IRCI Free Range Reconstruction for SAR Imaging with Arbitrary Length OFDM Pulse [PDF]
, 2013 Our previously proposed OFDM with sufficient cyclic prefix (CP) synthetic aperture radar (SAR) imaging algorithm is inter-range-cell interference (IRCI) free and achieves ideally zero range sidelobes for range reconstruction. In this OFDM SAR imaging algorithm, the minimum required CP length is almost equal to the number of range cells in a swath ...
Kong, Lingjiang +2 more
arxiv +4 more sources
Modeling Interference Between OFDM/OQAM and CP-OFDM: Limitations of the PSD-Based Model [PDF]
arXiv, 2016 To answer the challenges put out by the next generation of wireless networks (5G), important research efforts have been undertaken during the last few years to find new waveforms that are better spectrally localized and less sensitive to asynchronism effects than the widely deployed Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM ...
Bader, Faouzi +2 more
arxiv +8 more sources
Superposed IM-OFDM (S-IM-OFDM): An Enhanced OFDM for Integrated Sensing and Communications [PDF]
arXivIntegrated sensing and communications (ISAC) is a critical enabler for emerging 6G applications, and at its core lies in the dual-functional waveform design. While orthogonal frequency division multiplexing (OFDM) has been a popular basic waveform, its primitive version falls short in sensing due to the inherent unregulated auto-correlation properties.
Zonghui Yang +3 more
arxiv +4 more sources
Alamouti OFDM/OQAM systems with time reversal technique [PDF]
arXiv, 2015 Orthogonal Frequency Division Multiplexing with Offset Quadrature Amplitude Modulation (OFDM/OQAM) is a multicarrier modulation scheme that can be considered as an alternative to the conventional Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) for transmission over multipath fading channels.
Blel, Ilhem, Bouallegue, Ridha
arxiv +3 more sources
Performance Analysis of Compressive Sensing based LS and MMSE Channel Estimation Algorithm
Journal of Communications Software and Systems, 2021 In this paper, we have developed and implemented Minimum Mean Square Channel Estimation with Compressive Sensing (MMSE-CS) algorithm in MIMO-OFDM systems.
Ami Munshi, Srija Unnikrishnan
doaj +1 more source
The Evolution of Optical OFDM [PDF]
IEEE Communications Surveys & Tutorials, 2021 Optical Orthogonal Frequency-Division Multiplexing (O-OFDM) is eminently suitable for mitigating the multi-path and chromatic dispersion in both Visible Light Communications (VLC) and Optical Fiber Communications. We commence our discourse by surveying the conception and historic evolution of O-OFDM designed for both VLC and optical fiber, culminating ...
Xiaoyu Zhang +4 more
openaire +5 more sources