Optical receivers for wide band data transmission systems

Leskovar, B.

doi:10.1109/23.34550

Cited by 37 publications

(13 citation statements)

References 13 publications

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“…The preamplifier used in this study for the OOK system is the p-i-n photodetector in conjunction with FET-based transimpedance preamplifier which was used in [24]. Higher data rates of 5 Gbit/s and 2.5 Gbit/s are also considered and here we used the receiver in [25].…”

Section: Performance Analysis and Simulation Resultsmentioning

confidence: 99%

Collaborative multibeam transmitter and imaging receiver in realistic environment

Alhartomi

Alsaadi

Elmirghani

2015

2015 17th International Conference on Transparent Optical Networks (ICTON)

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In this paper, we propose a collaborative mobile optical wireless (OW) system that employs a collaborative adaptive beam clustering method (CABCM) in conjunction with an imaging receiver. Collaborative maximum ratio combining ( ) scheme is used to collaboratively distribute the transmit power among diffusing spots. The main goal is to increase the received optical power and improve the signal-to-noise ratio (SNR) at each coexisting receiver when the system operates in a multiuser scenario under the constraints of background noise, multipath dispersion and mobility. Our proposed system (collaborative adaptive beam clustering method) is evaluated at 30 Mbit/s to enable comparison with previous work, and is also assessed at higher bit rates: 2.5 Gbit/s and 5 Gbit/s. Simulation results show that at a bit rate of 30 Mbit/s, a significant SNR improvement of 39 dB is achieved when a CABCM system replaces a multiuser line strip multibeam system (LSMS) at a 6 m transmitter-receiver horizontal separation. The results also show that the proposed system can achieve a 22 dB SNR when the system operates at 2.5 Gbit/s in a two-user scenario. Keywords: Optical wireless, collaborative multibeam transmitter, beam clustering, beam power adaptation. INTRODUCTIONThe optical spectrum has the potential to provide a high-speed transmission medium for short-range indoor wireless communication systems. The OW link provides a secure and a promising complement to radio frequency (RF) links as well as an abundant unregulated bandwidth that enables rapid deployment at low cost [1]. However, the design challenges of OW systems lie in two major impairments when employing intensity modulation with direct detection (IM/DD). These impairments include multipath dispersion and additive noise due to sunlight and artificial background light. The former degrades the signal-to-noise ratio (SNR) while the latter limits the link capacity. In addition, OW links are subjected to eye and skin safety regulations which restrict the maximum allowed optical power transmitted [2], [3]. OW links are often categorized into two basic classification schemes: direct LOS and diffuse systems. Direct LOS links improve power efficiency and minimize multipath dispersion, but inherently require transmitterreceiver alignment and can suffer from shadowing due to moving objects. Diffuse systems offer links that are robust in the presence of shadowing, but severely suffer from multipath dispersion in addition to higher path losses compared to direct LOS links. A possible efficient technique that can exploit the advantaged of direct LOS systems and overcome the drawbacks of diffuse links is a multibeam transmitter [4] - [9]. The multibeam transmitter was proposed to tackle the impact of multipath dispersion, mitigate the shadowing effects and improve SNR performance. The multibeam transmitter is used to generate multiple diffusing spots pointed in different directions in a room, which act as secondary transmitters [5], [9]. Another efficient and simple technique that ca...

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Section: Performance Analysis and Simulation Resultsmentioning

confidence: 99%

Collaborative multibeam transmitter and imaging receiver in realistic environment

Alhartomi

Alsaadi

Elmirghani

2015

2015 17th International Conference on Transparent Optical Networks (ICTON)

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“…Calculations of the background shot noise can be found in [14], and higher bit rates of 1.25 Gb/s and 2.5 Gb/s are evaluated in our proposed systems. We used the preamplifier design proposed in [31].…”

Section: In Indoor Ir Communication Links Intensity Modulation and Dmentioning

confidence: 99%

Uplink design in VLC systems with IR sources and beam steering

2017

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The need for high-speed local area networks to meet the recent developments in multimedia and video transmission applications has recently focused interest on visible light communication (VLC) systems. Although VLC systems provide lighting and communications simultaneously from light emitting diodes, LEDs, the uplink channel design in such a system is a challenging task. In this paper, we propose a solution in which the uplink challenge in indoor VLC is resolved by the use of an Infrared (IR) link. We introduce a novel fast adaptive beam steering IR system (FABS-IR) to improve the uplink performance at high data rates while providing security for applications. The goal of our proposed system is to enhance the received optical power signal, speed up the adaptation process and mitigate the channel delay spread when the system operates at a high transmission rate. The channel delay spread is minimised from 0.22 ns given by hybrid diffuse IR link to almost 0.07 ns. At 2.5 Gb/s, our results show that the imaging FABS-IR system accomplished about 11.7 dB signal to noise ratio (SNR) in the presence of multipath dispersion, receiver noise and transmitter mobility.Index Terms-uplink channel, beam steering IR, delay spread, SNR.

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“…A higher data rate of 5 Gbps was also considered, and here we used the p-i-n FET receiver design in [27]. A significant improvement in the SNR at low data rates (50 Mbps) was achieved when the ADR LD-VLC system was used instead of the wide FOV LD-VLC system.…”

Section: Snr Analysismentioning

confidence: 99%

High-speed indoor visible light communication system employing laser diodes and angle diversity receivers

Hussein

Elmirghani

2015

2015 17th International Conference on Transparent Optical Networks (ICTON)

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The two main challenges facing high data rate visible light communication (VLC) are the low modulation bandwidth of the current transmitters (i.e. light emitting diodes, LEDs) and the inter symbol interference (ISI) caused by multipath propagation. In this paper, we evaluate laser diodes (LDs) as a source of illumination and communication instead of LEDs for a VLC system in conjunction with an angle diversity receiver (ADR). The main advantage of using LDs is their high modulation bandwidth that enables communication at data rates of multi gigabits per second for VLC when using a suitable receiver, such as an ADR, which mitigates the ISI. Our proposed system uses simple on-off keying (OOK) modulation, and it is able to provide data rates of 5 Gbps and a bit-error-rate (BER) of 10 -6 in the worst case scenario.

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Optical receivers for wide band data transmission systems

Cited by 37 publications

References 13 publications

Collaborative multibeam transmitter and imaging receiver in realistic environment

Collaborative multibeam transmitter and imaging receiver in realistic environment

Uplink design in VLC systems with IR sources and beam steering

High-speed indoor visible light communication system employing laser diodes and angle diversity receivers

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