Results 211 to 220 of about 61,870 (240)
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Comparison of ACO-OFDM, DCO-OFDM and ADO-OFDM in IM/DD Systems
Journal of Lightwave Technology, 2013In this paper, three forms of orthogonal frequency division multiplexing (OFDM) designed for intensity modulated/direct detection (IM/DD) optical systems are compared. These are asymmetrically clipped optical OFDM (ACO-OFDM), DC biased optical OFDM (DCO-OFDM) and asymmetrically clipped DC biased optical OFDM (ADO-OFDM). ADO-OFDM is a new technique that
Jean Armstrong, Sarangi D. Dissanayake
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A OFDM module for a MB-OFDM receiver
2007 International Conference on Design & Technology of Integrated Systems in Nanoscale Era, 2007The rules defined by FFC, for marketing and operation of UWB products, permitted the use of orthogonal frequency division multiplexing (OFDM) to implement UWB communications. MB-OFDM is taking place as good approach to UWB, for instance for wireless USB.
N. Rodrigues +2 more
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On the DWT- and WPT-OFDM versus FFT-OFDM
Exhibition, 2009We demonstrate simulation approaches for wavelet based OFDM, particularly in DWT and WPT-OFDM as alternative substitutions for Fourier based OFDM. We begin by constructing the models of the inverse and forward transforms, which can be flexible for substitutions in an OFDM system. We explain in detail each model and study the BER performance.
Khaizuran Abdullah +2 more
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P-OFDM: Spectrally Efficient Unipolar OFDM
Optical Fiber Communication Conference, 2014A novel OFDM signal format, polar-OFDM (P-OFDM), is proposed. P-OFDM offers twice as much spectral efficiency as state-of-the-art real-value unipolar OFDM formats. Inherently, the high PAPR is reduced and the numerical evaluation of the BER performance under dynamic-range constraint of optical sources demonstrates superior results.
Hany Elgala, Thomas D. C. Little
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Performance comparison of DFT-OFDM, DCT-OFDM, and DWT-OFDM for visible light communications
17th International Conference on Optical Communications and Networks (ICOCN2018), 2019We compare the bit error rate (BER) performances of discrete Fourier transform (DFT), discrete cosine transform (DCT) and discrete wavelet modulation (DWT) based orthogonal frequency division multiplexing (OFDM) schemes for visible light communications (VLC).
Chun Lin +5 more
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Experimental broadband OFDM system: field results for OFDM and OFDM with frequency domain spreading [PDF]
Proceedings IEEE 56th Vehicular Technology Conference, 2003 The paper presents link performance results of a series of field experiments conducted for OFDM and spread-OFDM/MC-CDMA in the context of a fourth-generation cellular system (4G) downlink. The experimental system is a 20 MHz 2/spl times/2 MIMO-OFDM system operating at a carrier frequency of 3.676 GHz.
Vijay Nangia, Kevin L. Baum
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The structure design and analysis of OFDM symbol in CO-OFDM system [PDF]
SPIE Proceedings, 2010 The structure of OFDM symbol has great influence on CO-OFDM system. This paper first presents a typical structure of OFDM symbol with virtual subcarriers and pilots for CO-OFDM. Simulation results indicate that the proposed structure is very suitable for CO-OFDM system and with this structure performance of CO-OFDM is improved largely.
Yaojun Qiao, Yuefeng Ji, Zhansheng Wang
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Comparison of DCO-OFDM, ADO-OFDM, HDC-OFDM and HNC-OFDM for Optical Wireless Communications
Journal of Optical Communications, 2018Abstract This paper presents a new form of orthogonal frequency division multiplexing (OFDM) termed as hybrid noise cancelled asymmetrically clipped optical OFDM (HNC-OFDM) for optical wireless communication. This HNC-OFDM is formed by combining the concepts of noise cancelled asymmetrically clipped optical OFDM and DC biased optical ...
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IEEE Communications Magazine, 1998
This article discusses the VLSI implications of high-speed coded orthogonal frequency-division multiplexing modulation. This is achieved by looking at practical examples of the computational blocks that constitute a COFDM modem and then examining examples of COFDM chips.
Neil Weste, D.J. Skellern
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This article discusses the VLSI implications of high-speed coded orthogonal frequency-division multiplexing modulation. This is achieved by looking at practical examples of the computational blocks that constitute a COFDM modem and then examining examples of COFDM chips.
Neil Weste, D.J. Skellern
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OFDM-MSK: A method for sidelobe suppression in OFDM systems [PDF]
20th Iranian Conference on Electrical Engineering (ICEE2012), 2012 Orthogonal frequency division multiplexing (OFDM) systems suffer from high sidelobes level. In some applications, as cognitive radios, this phenomenon can be a serious matter. This paper proposes Minimum shift keying (MSK)-OFDM to address this problem. The proposed method is an OFDM system using MSK modulation in each subcarrier.
Hamid Saeedi-Sourck +2 more
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