Results 11 to 20 of about 15,580 (224)
Spectrally efficient optical orthogonal frequency division multiplexing. [PDF]
Philos Trans A Math Phys Eng Sci, 2020 This paper charts the development of spectrally efficient forms of optical orthogonal frequency division multiplexing (OFDM) that are suited for intensity-modulated direct detection systems, such as wireless optical communications. The journey begins with systems using a DC-bias to ensure that no parts of the signal that modulates the optical source ...
Lowery AJ.
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Interleaved orthogonal frequency division multiplexing system [PDF]
IEEE International Conference on Acoustics Speech and Signal Processing, 2002 A new orthogonal frequency division multiplexing (OFDM) system for wireless communications over frequency selective fading channels is presented. The proposed interleaved orthogonal frequency division multiplexing (IOFDM) system promises higher code rate as compared to the conventional OFDM system without bandwidth expansion and with very slight ...
Prasad, VGS, Hari, KVS
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Improving the chromatic dispersion tolerance in long-haul fibre links using the coherent optical orthogonal frequency division multiplexing [PDF]
, 2010 Numerical simulations of the coherent optical orthogonal frequency division multiplexing modems are undertaken to investigate the effect of the adaptive modulation, the number of sub-carriers, the cyclic prefix (CP) length, the clipping ratio ...
Ghassemlooy, Zabih +5 more
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Superposition Coded-Orthogonal Frequency Division Multiplexing [PDF]
IEEE Access, 2018 Orthogonal frequency division multiplexing (OFDM) technique is the most used approach in various wireless communication technologies due to its implementation advantages. However, OFDM has also some significant drawbacks, such as the sensitivity against real-time impairments and the poor peakto-average power ratio (PAPR) performance.
Selahattin Gökceli +1 more
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Folded orthogonal frequency division multiplexing
Optics Express, 2016 We propose and demonstrate a new sub-carrier multiplexing scheme, utilizing orthogonal, periodic-sinc-shaped sub-carrier spectra. This 'folded' OFDM allows for multi-carrier bands to be generated with the precise, rectangular frequency definition of Nyquist WDM.
Bill, Corcoran +3 more
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Orthogonal frequency division multiplexing with index modulation
2012 IEEE Global Communications Conference (GLOBECOM), 2012 In this paper, a novel orthogonal frequency division multiplexing (OFDM) scheme, called OFDM with index modulation (OFDM-IM), is proposed for operation over frequency-selective and rapidly time-varying fading channels. In this scheme, the information is conveyed not only by M-ary signal constellations as in classical OFDM, but also by the indices of ...
Basar,E. +4 more
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Orthogonal frequency division multiplexing with cascade index modulation [PDF]
IET Communications, 2021 Abstract As an emerging technique, index modulation (IM) can improve the system bit error rate (BER) performance due to the robustness of index bits over conventional modulated symbol bits. The existing IM aided orthogonal frequency division multiplexing (OFDM) schemes only employ one index modulator at the transmitter, which ...
Zeng Hu +3 more
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Unified MIMO-multicarrier designs: a space–time shift keying approach [PDF]
, 2015 A survey and tutorial is provided on the subject of multiple-input multiple-output (MIMO) multicarrier (MC) systems relying on the space-time shift keying concept.
Sugiura, Shinya +3 more
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Orthogonal Frequency Division Multiplexing and its Applications
CoRR, 2013 Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technique which is very much popular in new wireless networks of IEEE standard, digital television, audio broadcasting and 4G mobile communications. The main benefit of OFDM over single-carrier schemes is its ability to cope with severe channel conditions without complex ...
Ankit R. Chadha +2 more
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ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING [PDF]
, 2020 Orthogonal frequency division multiplexing (OFDM) is a method of modulation of digital signal ...
Priti Dhama, Pallavi Goel
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