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Sample indexed spatial orthogonal frequency division multiplexing

Chinese Optics Letters 2014年第9期12卷 10-14页

作者： Pankil Butala hany elgala Thomas D.C.Little Department of Electrical and Computer Engineering Boston University

Optical spatial modulation （OSM） is a multiple-transmitter technique that can provide higher data rates with low system complexity as compared with single-input single-output systems. Orthogonal frequency division multiplexing （OFDM） is widely implemented to achieve better spectral efficiency in wireless channels. Asymmetrically clipped optical OFDM （O-OFDM） and DC-biased O-OFDM are two well-known O-OFDM techniques suitable for intensity-modulation direct-detection optical systems. In this work, sample indexed spatial OFDM （SIS-OFDM） is proposed to combine OSM and O-OFDM in a novel way and achieve significant per- formance gain. By assigning time-domain samples of the O-OFDM transmit symbol to different transmitters, SIS-OFDM achieves much better spectral efficiency and reduces computational complexity at the transmitter as compared with previous work that combines OSM with O-OFDM in the frequency domain. We also consider the impact of optical source biasing on overall performance, and the relative performance of imaging receiver （ImR） versus non-imaging receiver （NImR） design for our proposed SIS-OFDM technique. Results indicate that for an Ntx x Nrx multiple-input multiple-output configuration where Nix = N = 4, SIS-OFDM using ImR can achieve up to 135 dB of signal-to-noise ratio gain over comparable system using a NImR. Also, using Nc number of O-OFDM subcarriers provides up to Nsc × log2（Ntx） additional bits per symbol of spectral efficiency over technioues that combine OSM and O-OFDM in the freollencv domain.

关键词： OFDM SIS DCO Sample indexed spatial orthogonal frequency division multiplexing

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Augmented communications: spectral efficiency and security enhanced visible light communications by design

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Chinese Optics Letters 2020年第9期18卷 14-19页

作者： Monette H.Khadr hany elgala Electrical and Computer Engineering Department University at AlbanyNew York 12222USA

A plethora of physical-layer techniques aim to enhance the performance of communication systems in several ways. Spectral efficiency and security are on the top of the list of enhancements;however, both are isolated and antagonistic islands of research. Augmented communication(ACom) is introduced in this Letter as the first technique that aims to combine these two enhancements in visible light communications(VLCs). The dividends of the proposed concept are demonstrated via simulations and the performance is experimentally *** show that ACom can simultaneously provide the high spectral efficiency and the resistance to eavesdropping, while introducing minimal signal-to-noise ratio penalties.

关键词： augmented communications orthogonal frequency division multiplexing spectral efficiency physical layer security visible light communications

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