Multilevel Digital Pulse Interval Modulation Scheme for Optical Wireless Communications

Ghassemlooy, Zabih; Aldibbiat, Nawras

doi:10.1109/icton.2006.248423

Cited by 15 publications

(18 citation statements)

References 10 publications

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“…DH-PIM is composed of a header of fixed length and a payload of variable length depending on the decimal value of input data. Recently multi-level PTM modulation schemes has also been proposed including DAPPM [17] and MPIM [3] where the symbol headers are differentiate by the pulse amplitude.…”

Section: Modulation Techniquesmentioning

confidence: 99%

“…For modulated optical sources, generally, the average power level limits the transmitted optical power. With the safety issues in mind, one should select a modulation technique which is power as well as bandwidth efficient [1,3,4]. Power efficiency is achieved by employing modulation schemes with a high peak and low average powers but at the cost of multipath induced ISI in indoor OW links especially at high bit rates [5].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Modulation Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Since proposed, it has been widely investigated in spectral evaluation [3], [4] and error performance over various channels [5]- [17]. Many enhanced modulation schemes have been proposed [18]- [27]. For instance, the authors of [18] and [19] proposed multilevel digital pulse interval modulation (MDPIM) and dual-header Part of the work has been presented in IEEE GLOBECOM OWC workshop 2018 [1].…”

Section: Introductionmentioning

confidence: 99%

Ordered Sequence Detection and Barrier Signal Design for Digital Pulse Interval Modulation in Optical Wireless Communications

Guo

Park

Alouini

2019

IEEE Trans. Commun.

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This paper proposes an ordered sequence detection (OSD) for digital pulse interval modulation (DPIM) in optical wireless communications. Leveraging the sparsity of DPIM sequences, OSD shows comparable performance to the optimal maximum likelihood sequence detection (MLSD) with much lower complexity. Compared with the widely adopted sampleby-sample optimal threshold detection (OTD), it considerably improves the bit error rate (BER) performance by mitigating error propagation. Moreover, this paper proposes a barrier signalaided digital pulse interval modulation (BDPIM), where the last of every K symbols is allocated with more power as an inserted barrier signal. BDPIM with OSD (BDPIM-OSD) can limit the error propagation between two adjacent barriers. To reduce the storing delay when using OSD to detect extremely large packets, we propose BDPIM with a combination of OTD and OSD (BDPIM-OTD-OSD), within which long sequences are cut into pieces and separately detected. Approximate upper bounds of the average BER performance of DPIM-OTD, DPIM-OSD, BDPIM-OSD and BDPIM-OTD-OSD are analyzed. Simulations are conducted to corroborate our analysis. Optimal parameter settings are also investigated in uncoded and coded systems by simulations. Simulation results show that the proposed OSD and BDPIM bring significant improvement in uncoded and coded systems over various channels.Index Terms-Digital pulse interval modulation, ordered sequence detection, signal design, error propagation, bit error rate arXiv:1804.04431v2 [eess.SP]

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“…In MDPIM, each block of M-bit input OOK data is mapped to one of L = 2 M possible symbols (see Table 1). Each symbol starts with a pulse of amplitude A (if the MSB of input data is to "0") or 2A (if the MSB of input data is to "1") followed by a guard slot and information slot of length {1, 2…L/2} [22]. The information slot length is equal to the decimal value of the binary input if MSB is 0 else it is equal to the decimal value of the 1's compliment of the binary input [22].…”

Section: Multilevel Digital Pulse Interval Modulation (Mdpim)mentioning

confidence: 99%

“…Each symbol starts with a pulse of amplitude A (if the MSB of input data is to "0") or 2A (if the MSB of input data is to "1") followed by a guard slot and information slot of length {1, 2…L/2} [22]. The information slot length is equal to the decimal value of the binary input if MSB is 0 else it is equal to the decimal value of the 1's compliment of the binary input [22]. MDPIM not only removes the redundant time slots that follow the pulse as in PPM symbol, but also reduces the average symbol length compared with the DPIM and DH-PIM, thus resulting in an increased data throughput.…”

Section: Multilevel Digital Pulse Interval Modulation (Mdpim)mentioning

confidence: 99%

A synopsis of modulation techniques for wireless infrared communication

Ghassemlooy

Popoola

Rajbhandari

et al. 2007

2007 ICTON Mediterranean Winter Conference

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A number of modulation techniques have been proposed and thoroughly analysed in literature for optical wireless communication systems. Each modulation technique has its unique attractive features as well as its challenges. Some are very simple to implement and bandwidth efficient like the On-Off keying (OOK). Pulse interval modulation (PIM) techniques are reputed for their inherent synchronisation pulse, subcarrier modulation offers increased throughput, resilience to the inter-symbol interference (ISI) and immunity against the fluorescent-light noise near DC, while pulse position modulation (PPM) provides the unparalleled power efficiency in line of sight (LOS) links but the performance degrades severely in dispersed communication channel. There has been an enormous work on the analysis of these and many more modulation techniques under different channel and environmental conditions; we however present here a concise synopsis of the mostly reported wireless infrared modulation techniques.

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Multilevel Digital Pulse Interval Modulation Scheme for Optical Wireless Communications

Cited by 15 publications

References 10 publications

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

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

Ordered Sequence Detection and Barrier Signal Design for Digital Pulse Interval Modulation in Optical Wireless Communications

A synopsis of modulation techniques for wireless infrared communication

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