Experimental performance evaluation of non-line-of-sight ultraviolet communication systems

Xu, Zhengyuan; Chen, Gang; Abou-Galala, Feras; Leonardi, Michael J.

doi:10.1117/12.735183

Cited by 41 publications

(17 citation statements)

References 23 publications

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“…Such a link offers advantages in low power and miniaturization for easy system operation and maintenance. Corresponding test-beds and performances were reported 4,5,6 . Due to solar blindness and significant wave scattering of the media, outdoor NLOS UV communication is made possible in the solar blind wavelength regime (200~280 nm).…”

Section: Introductionmentioning

confidence: 91%

A parametric single scattering channel model for non-line-of-sight ultraviolet communications

et al. 2008

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Recent advances in ultraviolet (UV) semiconductor sources and detectors have inspired significant research activities in short-range UV communications, particularly in non-line-of-sight (NLOS) channel conditions due to atmospheric scattering. However, a scattering channel involves complex interactions of photons with atmospheric particles. This paper presents a parametric channel model that greatly simplifies channel characterization. For a short range link, single scattering may dominate in some scenarios. We model the channel impulse response with a gamma function as well as its variants to better fit the prediction by a widely adopted analytical single scattering model. Normalized mean square fitting error is adopted to validate our parametric model. Path losses and channel bandwidths are subsequently studied under different geometrical link configurations.

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Section: Introductionmentioning

confidence: 91%

A parametric single scattering channel model for non-line-of-sight ultraviolet communications

et al. 2008

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“…The UV-based systems can overcome these basic limitations as illustrated in the recent literature. 16,17 2. NLOS FSO BY…”

Section: Rf Over Fso Schemes and Challengesmentioning

confidence: 99%

Non-line-of-sight ultraviolet communication based on DHT ACO-OFDM

Gao

Chen

2012

SPIE Proceedings

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Free space optical (FSO) communication has attracted tremendous research interest in the recent year. Most existing works focus only on the line-of-sight (LOS) transmission by infrared (IR) or visible light lasers/LEDs, while this article suggested a framework of non-line-of-sight (NLOS) FSO, motivated by our recent experimental results on the successful transmission of NLOS ultraviolet (UV) beams for up to kilometers, which is comparable to the typical distance a LOS FSO transmission. The NLOS provides an alternate path when the LOS path is shadowed or is highly attenuated. In order to mitigate the multipath dispersion of the NLOS FSO, a baseband orthogonal frequency division multiplexing (OFDM) modulation scheme was proposed, based on Discrete Hartley Transform (DHT) and asymmetric clipping to guarantee the positive-realness of the transmitted optical intensity. The proposed system could reduce the hardware complexity of transmitter and receiver. Minimum mean square error (MMSE) precoder was applied before the DHT to remove the crosstalk between subcarriers, i.e. the frequency domain orthogonality of OFDM was preserved. Performance of the BPSK modulated communication system was given under lognormal atmospheric turbulence for demonstration of the feasibility of the proposed method.In this era of gigabits, optical communication is gradually becoming a necessary part of urban life. High speed communications among towns and cities have been achieved thanks to the employment of optical fiber as backbone. It is often costly or even impossible to connect the backbone and client premises by optical fiber, known as a "last mile" problem. This problem urges the emergence of FSO communications to bridge the gap. Latest laboratory and space experiments have demonstrated it as a ready-to-deploy, cost-effective, license-free, and high-bandwidth access measure 1, 2 . Compare to the radio frequency (RF) systems, the optical wave systems also outperform for much smaller antennas that takes up less volumn and power. 3 Similarities and differences coexist between the RF and FSO terminologies so that ideas for FSO can be borrowed from the more widely-studies RF but cautiously. Multiple-input-multiple-output (MIMO) schemes which take advantage of diversity has been shown as an efficient technique to mitigate the atmospheric turbulence for FSO. 4 Multihop FSO may serve as one of another means for combating the strong turbulence with help of relays that are able to amplify the attenuate signals. 5 Transmission of RF signals over FSO link also draw considerable attention. The ACO-OFDM based FSO system introduced by this article in the following sections belongs to the RF over FSO territory. Popular RF over FSO topics also include the sub-carrier multiplexed free space optics (SIM-FSO), 6-8 code division multiplexing access (CDMA) over FSO,10,11 etc. Different from the broadcasting nature of RF, the typical FSO waves travel only through the LOS path, i.e., a pointto-point assumption had been widely adpoted. Therefore, the FSO channels...

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“…Several scattering propagation models have been presented [4][5][6][7][8][9] , which can be made use of for signal evaluation and system design of UV communication systems. And also several UV communication systems have been presented [10][11][12][13][14] , it is expectable that UV communication works for the humans' needs in the near future.…”

Section: Introductionmentioning

confidence: 99%

Extending the data rate of non-line-of-sight UV communication with polarization modulation

et al. 2012

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With low radiation background of solar-blind UV and strong scattering of UV photons by atmospheric particles, UV communication can be made use of to set up a non-line-of-sight (NLOS) free-space optical communication link. Polarization modulation, besides the traditional intensity modulation, is presented to enhance the data rate of the UV communication system. The configuration and the working process of the dually modulated UV communication system with intensity modulation and polarization, the theoretical evaluation of polarization modulation, and a numerical of the scattering matrix are presented, with the conclusion that polarization modulation is achievable. By adding the polarizing devices and changing the coding procedures, the existing singly-modulated UV communication systems with intensity modulation are easily modified to be dually-modulated ones with polarization modulation and intensity modulation. Ideally speaking, the data rate of the dually-modulated UV communication system is the product of the data rate of the singly modulated system and the number of polarization modulation.

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Experimental performance evaluation of non-line-of-sight ultraviolet communication systems

Cited by 41 publications

References 23 publications

A parametric single scattering channel model for non-line-of-sight ultraviolet communications

A parametric single scattering channel model for non-line-of-sight ultraviolet communications

Non-line-of-sight ultraviolet communication based on DHT ACO-OFDM

Extending the data rate of non-line-of-sight UV communication with polarization modulation

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