Baseline-wander effects on systems employing digital pulse-interval modulation

Hayes, Andrew; Ghassemlooy, Zabih; Seed, N. L.; McLaughlin, R.

doi:10.1049/ip-opt:20000565

Cited by 26 publications

(21 citation statements)

References 16 publications

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“…Since the DC component is filtered by DWT, the threshold level set midway between "1" and "0" levels, in the absence of any BLW and is given as Eq. 13 (Hayes et al, 2000):…”

Section: Resultsmentioning

confidence: 99%

The Performance of a Dual Header Pulse Interval Modulation in the Presence of Artificial Light Interferences in an Indoor Optical Wireless Communications Channel with Wavelet Denoising

Rajbhandari

Ghassemlooy²,

Angelova³

2011

American Journal of Engineering and Applied Sciences

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Problem statement: Similar to other baseband modulation schemes, the performance of the Dual Header Pulse Interval Modulation (DH-PIM) is adversely affected by Artificial Light Interferences (ALI) in an indoor Optical Wireless Communications (OWC) channel. Approach: The Discrete Wavelet Transform (DWT) based denoising is studied for reducing the effect of the ALI. Computer simulation is carried out to demonstrate the effectiveness of the proposed system. The Baseline Wander (BLW) affects for a range of bit resolutions is also analyzed. Results: The normalized optical power requirement in the presence of ALI is high in the range of 9-15 dB depending upon the bit resolution. A significant reduction in the optical power penalty is observed with the DWT denoising scheme. Conclusion: The DWT based denoising scheme is effective in reducing the consequence of the ALI. The optical power penalty decreases with an increase in the data rate and the bit resolution, which is due to reduction of the DC values and low frequency spectrum.

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“…Since the DC component is filtered by DWT, the threshold level set midway between "1" and "0" levels, in the absence of any BLW and is given as Eq. 13 (Hayes et al, 2000):…”

Section: Resultsmentioning

confidence: 99%

The Performance of a Dual Header Pulse Interval Modulation in the Presence of Artificial Light Interferences in an Indoor Optical Wireless Communications Channel with Wavelet Denoising

Rajbhandari

Ghassemlooy²,

Angelova³

2011

American Journal of Engineering and Applied Sciences

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“…DAPPM suffers from a high average power and a large DC component, thus restricting its use to applications where power is not a premium. It is also susceptible to the baseline wander due to its large DC component [17,18].…”

Section: Differential Amplitude Pulse Position Modulation (Dappm)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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“…Optical wireless communications (OWC) has attracted a great deal of attention with recent commercialization success [1,2] . Intensity modulation such as on-off keying (OOK), pulse position modulation (PPM) and digital pulse interval modulation (DPIM) [2][3][4] are used to convert information for OWC.…”

mentioning

confidence: 99%

“…Intensity modulation such as on-off keying (OOK), pulse position modulation (PPM) and digital pulse interval modulation (DPIM) [2][3][4] are used to convert information for OWC. DPIM is regarded as a suitable scheme for optical link in future [5,6] .…”

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confidence: 99%

Implementation of pulse interval modulation based on dualmapping technique for optical wireless communications

Zhang

Wang

et al. 2009

Optoelectron. Lett.

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Aiming at implementing the digital pulse interval modulation (DPIM) for optical wireless communications (OWC), a dualmapping technique is presented. The scheme of DPIM train based upon the dual-mapping technique is given. Its slot error rate is derived for the avalanche photonic diode (APD) receiver model, and is compared with that of classical DPIM.Simulation results show that the dual-mapping DPIM (D-DPIM), which has a fixed slot length, only has marginally inferior error performance, but can solve waiting slots or buffer overflowing in comparison with DPIM. Hence, it is suitable for the optical wireless communication systems.

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Baseline-wander effects on systems employing digital pulse-interval modulation

Cited by 26 publications

References 16 publications

The Performance of a Dual Header Pulse Interval Modulation in the Presence of Artificial Light Interferences in an Indoor Optical Wireless Communications Channel with Wavelet Denoising

The Performance of a Dual Header Pulse Interval Modulation in the Presence of Artificial Light Interferences in an Indoor Optical Wireless Communications Channel with Wavelet Denoising

A synopsis of modulation techniques for wireless infrared communication

Implementation of pulse interval modulation based on dualmapping technique for optical wireless communications

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