Dual header pulse interval modulation for dispersive indoor optical wireless communication systems

Aldibbiat, Nawras; Ghassemlooy, Zabih; McLaughlin, R.

doi:10.1049/ip-cds:20020422

Cited by 37 publications

(13 citation statements)

References 17 publications

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“…The multipath channel, described by its impulse response h(t), is fixed for a given position of the transmitter, receiver and intervening reflectors, and changes significantly only when any of these are moved by distances of the order of centimetres [9]. Owing to the high bit rates and the relatively slow movement of people and objects within a room the channel will vary significantly only on a time scale covering many bit periods.…”

Section: Optical Channel Modelmentioning

confidence: 99%

“…OOK is the most effective in combating ISI at low data rates (< 10 Mbps), but at high bit rates it suffers from a large power penalty [6]. Digital modulation schemes, such as PPM [7], DPIM [8], and DH-PIM [9] offer reduced power but at the expense of increased bandwidth. However, the power penalty due to ISI increases more rapidly for highly dispersive channels due to the shorter slot duration [8].…”

Section: Introductionmentioning

confidence: 99%

“…However, the power penalty due to ISI increases more rapidly for highly dispersive channels due to the shorter slot duration [8]. The effect of multipath propagation, based on a ceiling bounce model (CBM), on the link performance has been widely used to predict ISI power penalties for diffuse OOK, PPM and DPIM and DH-PIM schemes [9], [10].…”

Section: Introductionmentioning

confidence: 99%

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Reducing the effects of intersymbol interference in diffuse DPIM optical wireless communications

Ghassemlooy¹,

Hayes²,

Wilson³

2003

IEE Proceedings - Optoelectronics

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This paper investigates the performance of digital pulse interval modulation (DPIM) in the presence of multipath propagation and additive white Gaussian noise. To combat intersymbol interference (ISI) guard slots and a non-linear equaliser have been introduced. The average optical power requirements (AOPR) due to ISI for cases with/without guard slots and with equaliser are analysed using a ceiling-bounce model. Results obtained show that in the absence of equalisation, DPIM without guard slot offers a lower AOPR compared with on-off keying (OOK). Introducing guard slots gives a further reduction in AOPR by up to 4 dB due to the reduced duty cycle of the DPIM signal. The performance of DPIM without guard slot buy using an equaliser is found to be significantly better than DPIM with guard slots on a channel with severe ISI.

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Section: Optical Channel Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reducing the effects of intersymbol interference in diffuse DPIM optical wireless communications

Ghassemlooy¹,

Hayes²,

Wilson³

2003

IEE Proceedings - Optoelectronics

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“…LAST exploits a MIMO Pulse Position Modulation (PPM) scheme that allows improving data rates and reducing Bit Error Rate (BER), and also relies on the double localization criterion (i.e., power measurements, and time difference of arrival), aiming to (i) understand the degree of freedom in the diversity transmission, and at the same time (ii) make a space division multiple access. Furthermore, regarding the choice of of modulation formats, although some solutions may appear really appealing (see [9] and [10]), PPM allows both localization and transmission/reception procedures, with the same transmission module. In fact, using two different technologies of localization and data transmission requires integration costs.…”

Section: Introductionmentioning

confidence: 99%

LAST: A Framework to Localize, Access, Schedule, and Transmit in Indoor VLC Systems

Biagi

Pergoloni

Vegni

2015

J. Lightwave Technol.

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The need allowing indoor access to the Internet services requires to reduce the electromagnetic pollution. Recently, the scientific community is looking for alternatives to the use of radio frequency communication, leading to propose and study the new paradigm of Visible Light Communications. In order to present a system implementing transmission and access procedures, we propose a logical stream starting from user localization, so as to decide which LEDs can provide access, thus basically performing a space division multiple access by scheduling data on the basis of the bits to be transmitted. For this aim, a 2-bands access scheme is proposed and implemented through the use of a separated channel where signaling specifies where, in the wavelength domain, the reception must be operated by the different users. A Multiple Input Multiple Output scheme is considered for data transmission, in order to increase rate with a reliable error rate performance. Performance is evaluated for what concerns localization and access tasks, so as to show the effectiveness of the proposed scheme. Performance comparison with recent literature has been also reported.

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“…For higher values of D rms the BER performance degrades very rapidly and beyond certain values of D rms increasing optical power will no longer improve the performance since ISI rather than the noise becomes the limiting factor. In PTM schemes the power plenty due to the ISI is more severe [19][20][21]. PPM with the shortest pulse duration is more susceptible to the multipath induced ISI, see Fig.…”

Section: Modulation Techniquesmentioning

confidence: 99%

Performance of diffused indoor optical wireless links employing neural and adaptive linear equalizers

Ghassemlooy

Rajbhandari

2007

2007 6th International Conference on Information, Communications &Amp; Signal Processing

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Abstract-This paper presents a comparative study of two equalizers, the adaptive linear and the neural equalizer for indoor optical wireless (OW) links. Three modulation schemes representative of a range of modulation techniques widely adopted in indoor OW systems are chosen to investigate the effectiveness of the proposed equalizers. It is shown that on-off keying (OOK) modulation technique is least affected by the multipath induced intersymbol interference (ISI), while the pulse position modulation (PPM) scheme is the most severely affected. In case of highly diffused channel, the equalized digital pulse interval modulation (DPIM) outperforms the equalized PPM and there is little or no gain in using PPM compared to OOK.

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Dual header pulse interval modulation for dispersive indoor optical wireless communication systems

Cited by 37 publications

References 17 publications

Reducing the effects of intersymbol interference in diffuse DPIM optical wireless communications

Reducing the effects of intersymbol interference in diffuse DPIM optical wireless communications

LAST: A Framework to Localize, Access, Schedule, and Transmit in Indoor VLC Systems

Performance of diffused indoor optical wireless links employing neural and adaptive linear equalizers

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