Closed form expressions for baseline wander effectsinwireless IR applications

Street, A.M.; Samaras, K.; O’Brien, Dominic; Edwards, D.J.

doi:10.1049/el:19970739

Cited by 16 publications

(13 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Specifically, the VFIR IrDA HHH(1,13) run-length limited code performs better clock and data recovery than PPM, while maintaining an acceptable bandwidth efficiency (approximately 67%) [33]. DC-balanced coding is also receiver oriented and is used to mitigate the baseline wander effect caused by high-pass filtering of optical noise at the receiver [34][35][36]. More sophisticated modulation schemes that involve transmission over multiple carriers, such as subcarrier modulation (SCM) [37,38] and orthogonal frequency division multiplexing (OFDM) [39][40][41] are also possible.…”

Section: Research-related Literaturementioning

confidence: 99%

“…Fluorescent noise cannot be filtered without rejecting a significant portion of the signal in low rate OOK/ASK systems [121], and adaptive filtering [123][124][125] or spread spectrum [126] techniques are required. Higher rate OOK/ASK systems have a broader spectrum and fluorescent noise may be rejected through high pass filtering, however this leads to a baseline wander effect and additional DC-balanced line coding is required [35]. Low rate PPM systems and their variants (DPIM, DPPM) are less vulnerable to noise from slowly modulated fluorescent lamps than OOK/ASK systems, since the peak spectrums of PPM is located at non-zero frequencies and high-pass filtering rejects fluorescent noise without imposing significant ISI [121].…”

Section: Noise and Interference Modeling And Mitigationmentioning

confidence: 99%

See 1 more Smart Citation

A review of communication-oriented optical wireless systems

Borah

Boucouvalas

Davis

et al. 2012

J Wireless Com Network

188

104

View full text Add to dashboard Cite

This article presents an overview of optical wireless (OW) communication systems that operate both in the short-(personal and indoor systems) and the long-range (outdoor and hybrid) regimes. Each of these areas is discussed in terms of (a) key requirements, (b) their application framework, (c) major impairments and applicable mitigation techniques, and (d) current and/or future trends. Personal communication systems are discussed within the context of point-to-point ultra-high speed data transfer. The most relevant application framework and related standards are presented, including the next generation Giga-IR standard that extends personal communication speeds to over 1 Gb/s. As far as indoor systems are concerned, emphasis is given on modeling the dispersive nature of indoor OW channels, on the limitations that dispersion imposes on user mobility and dispersion mitigation techniques. Visible light communication systems, which provide both illumination and communication over visible or hybrid visible/ infrared LEDs, are presented as the most important representative of future indoor OW systems. The discussion on outdoor systems focuses on the impact of atmospheric effects on the optical channel and associated mitigation techniques that extend the realizable link lengths and transfer rates. Currently, outdoor OW is commercially available at 10 Gb/s Ethernet speeds for Metro networks and Local-Area-Network interconnections and speeds are expected to increase as faster and more reliable optical components become available. This article concludes with hybrid optical wireless/radio-frequency (OW/RF) systems that employ an additional RF link to improve the overall system reliability. Emphasis is given on cooperation techniques between the reliable RF subsystem and the broadband OW system.

show abstract

Section: Research-related Literaturementioning

confidence: 99%

Section: Noise and Interference Modeling And Mitigationmentioning

confidence: 99%

A review of communication-oriented optical wireless systems

Borah

Boucouvalas

Davis

et al. 2012

J Wireless Com Network

188

104

View full text Add to dashboard Cite

show abstract

“…The frequency spectrum of FL, driven by high-frequency electronic ballasts, contains harmonic components extending into the MHz region (Moreira et al 1996, Narasimhan et al 1996, Street 1997. Consequently, when operating in the presence of an AAL source, it is necessary to increase HPF cut-on frequency significantly, in order to attenuate the interference signal generated by the lamp.…”

Section: With High-frequency Flmentioning

confidence: 99%

An experimental diffuse optical wireless link employing DPIM

Ghassemlooy

Aldibbiat

Hayes

2007

International Journal of Electronics

View full text Add to dashboard Cite

The paper presents the design for an experimental indoor optical wireless (OW) diffuse link using digital pulse interval modulation (DPIM). Complete system implementation and procedure for carrying out the measurement are given. The system performance in the presence of artificial ambient light (AAL) sources is given. A high pass filter (HPF) with cut-on frequency of 50 kHz is found to be sufficient to reject the interference signal from all AAL sources with the exception of the high-frequency (HF) fluorescent lamp (FL). Optical filtering reduces the average optical power penalty by 1 dB and 0.2 dB for the low-frequency (LF) FL, and the daylight. For the lowest error rate, the optimum HPF cut-on frequency in the presence of the HF-FL is found to be 884 kHz.The incandescent bulb introduces the largest average optical power penalty of 2.3 dB.

show abstract

“…It is also assumed that the receiver achieves perfect synchronisation. Following [7], the noise variance was chosen such that the system achieves a slot error rate (SER) of 10 -3 when baseline wander is ignored. The high slot error rate used is due to the run time required to perform the simulation, which, based on a slot sequence containing ~10 5 slots, was of the order of several hours.…”

Section: Simulation Modelmentioning

confidence: 99%

“…As stated in [7], baseline wander can be mitigated by employing quantized feedback baseline restoration, using a subcarrier modulation technique or employing a modulation scheme with a small spectral component at low frequencies. Employing quantized feedback increases receiver complexity and subcarrier modulation schemes are not as power efficient as other techniques, and hence, the third option is the most attractive.…”

Section: Introductionmentioning

confidence: 99%

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

Hayes

Ghassemlooy

Seed

et al. 2000

IEE Proceedings - Optoelectronics

View full text Add to dashboard Cite

Fluorescent lamps introduce a periodic interference signal in optical wireless receivers, which has the potential to severely degrade link performance. Usually, electrical high-pass filtering is employed to mitigate the effects of this interference, but this results in baseline wander or intersymbol interference. Digital pulse interval modulation (DPIM) is a modulation technique which has been shown to be suitable for deployment in optical wireless communication systems and this paper examines the effect of baseline wander on systems employing DPIM. A new expression is given for the slot autocorrelation function of DPIM and, from this, the power spectral density is calculated. The error performance of DPIM, as a function of high-pass filter (HPF) cut-on frequency, is compared with the more established techniques of on-off keying using non-return to zero signalling (OOK) and pulse position modulation (PPM), using both numerical analysis and computer simulation.

show abstract

Closed form expressions for baseline wander effectsinwireless IR applications

Cited by 16 publications

References 3 publications

A review of communication-oriented optical wireless systems

A review of communication-oriented optical wireless systems

An experimental diffuse optical wireless link employing DPIM

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

Contact Info

Product

Resources

About