Wireless optical communications: a survey

Mahdy, Ahmed; Deogun, Jitender S.

doi:10.1109/wcnc.2004.1311464

Cited by 85 publications

(34 citation statements)

References 16 publications

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“…They are widely used in various fields of application such as deep-space/inter-satellite communication, underwater search and rescue operations, home networks and ITS systems. Optical wireless communication is a possible alternative to RF wireless systems for short-distance wireless communication such as home networks because past research results have shown that much more data can be transmitted using light sources than in cellular networks, and communication can be carried out in a more straightforward, efficient, secure and widespread manner [2]. However, one of the major challenges that optical wireless communication faces is achieving highreliability communication.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of the Influence of Optical Background Noise by Using Turbo-Coded DOOK

Rai

Kozawa

Habuchi

et al. 2015

Journal of Signal Processing

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In this paper, turbo-coded on-off keying (OOK) with differential detection is proposed. The proposed system constitutes the standard turbo code with OOK modulation, differential encoding and a delay detection technique. The purpose of using the differential encoding system is to suppress the influence of background noise in an optical wireless channel (OWC). OOK systems use the threshold detection method to determine the data. In optical intensity modulation/direct detection (IM/DD) systems, disturbances in the channel such as background noise and scintillation make it more difficult to decide the threshold value. Hence, in order to deal with the degradation in the quality of communication due to background noise, a turbo-coded OOK system with differential encoding and delay detection is proposed. The bit error rate (BER) performance of the proposed system is analyzed through computer simulation of an OWC in the presence of background noise, scintillation and avalanche photodiode (APD) noise. In terms of the BER performance, the results of this study show that the proposed system outperforms the conventional turbo-coded OOK system by 2.0 [dBm] at BER=10 −5 .

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Section: Introductionmentioning

confidence: 99%

Mitigation of the Influence of Optical Background Noise by Using Turbo-Coded DOOK

Rai

Kozawa

Habuchi

et al. 2015

Journal of Signal Processing

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“…In addition, the feasibility of an optical wireless body area network is investigated in [11]. OWC offers several potential advantages which include large unregulated bandwidth, high security, possibility of frequency reuse and the use of inexpensive optoelectronic devices which are small and consume little power [12][13][14][15]. Furthermore, OWC links are suitable to portable devices since large quantity of small surface mount light emitting and light detecting components are available at relatively low cost [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Passive–Active Optical Wireless Transmission for Health Monitoring System

Noonpakdee

2015

Wireless Pers Commun

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This paper proposes a hybrid passive-active optical wireless transmission scheme for personal health monitoring system. In this scheme, passive and active optical wireless transmission is applied in order to attain the required signal to noise ratio (SNR). In passive transmission, thin film corner cube retroreflector (TCCR) is employed to modulate and reflect the obtained measurements from sensors to a central node. The absorbed power from TCCR helps recharge the battery in a wearable transmitter. The active transmission mode is applied when SNR of passive transmission mode cannot be achieved. An image sensor is utilized as a receiver. Absorbed power and reflected power at TCCR and SNR at the image sensor are analyzed with consideration of the transmitted power and the user's location. The analytical results indicate that by employing the hybrid passive-active optical wireless transmission scheme, the required SNR of 13.6 dB is achieved with energy efficiency.

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“…(v) high scalability and reconfigurability; (vi) secure and reliable data transmission medium; and (vii) minimal cost of deployment [9].…”

Section: Introductionmentioning

confidence: 99%

Practical implementation and performance study of a hard-switched hybrid FSO/RF link under controlled fog environment

Lee

Ghassemlooy²,

Ng³

et al. 2014

2014 9th International Symposium on Communication Systems, Networks &Amp; Digital Sign (CSNDSP)

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Due to copyright restrictions, the access to the full text of this article is only available via subscription.The availability and performance of terrestrial free-space optical (FSO) communication systems are heavily deterred by the fluctuating conditions of the atmospheric channel, particularly in the presence of visibility-limiting fog effects. In this paper, we examine the viability of deploying hybrid FSO and radio frequency (RF) links through an experimental study, which takes advantage of a dedicated laboratory atmospheric chamber to emulate the fog scenarios encountered on outdoor environment. In particular, a root mean square power detector is developed and introduced in the system under study to monitor the signal quality of the primary FSO link. The quasi-linear output voltage characteristics of the power detector device is utilized as a useful decision metric to implement hard switching in a hybrid FSO/RF link based upon the changes in the visibility. Our measurement results reveal that the selection of a desirable threshold voltage is dependent upon the intended data rate and minimum achievable bit error rate, in order to enable effective switching between the FSO and RF links.European Commissio

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Wireless optical communications: a survey

Cited by 85 publications

References 16 publications

Mitigation of the Influence of Optical Background Noise by Using Turbo-Coded DOOK

Mitigation of the Influence of Optical Background Noise by Using Turbo-Coded DOOK

Hybrid Passive–Active Optical Wireless Transmission for Health Monitoring System

Practical implementation and performance study of a hard-switched hybrid FSO/RF link under controlled fog environment

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