Capacity Analysis of M-PAM Inverse Source Coding in Visible Light Communications

Ahn, Kang-Il; Kwon, Jong-Kee

doi:10.1109/jlt.2012.2185780

Cited by 57 publications

(46 citation statements)

References 9 publications

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“…Time-multiplexed OOK [26,30] was developed to insert an ON or OFF time period without adaptive control of the mean optical power. Inverse source coding (ISC) was reported to outperform the time-multiplexed OOK and achieve the theoretical data rate bound asymptotically in a noise-free environment [31,32]. Multiple PPM was proposed to have as much rate support as ISC [30,33,34].…”

Section: Introductionmentioning

confidence: 99%

Optimal Signal Amplitude of Orthogonal Frequency-Division Multiplexing Systems in Dimmable Visible Light Communications

Yun

Lee

Ahn

et al. 2014

Journal of the Optical Society of Korea

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Visible light communications (VLC) using the intensity modulation of light-emitting diodes (LEDs) provides a new communication medium to overcome the shortage of radio spectrum, and allows reuse of LED lighting infrastructures. Orthogonal frequency-division multiplexing (OFDM) was introduced to VLC for its merits in mitigating the fading effects resulting from delay spread, and in avoiding low-frequency ambient interference. Noise and clipping are two major factors that degrade the performance of OFDM in VLC. A larger signal easily overcomes noise, but experiences impairment by clipping. Therefore, degradation due to clipping has a trade-off relationship with that due to noise, depending on the signal amplitude of OFDM. In this paper, the optimal signal amplitude in the trade-off is obtained by simulation when the dimming and LED intensity are given. The former indicates a user's requirement for lighting, and the latter represents the channel quality. The required LED intensity-to-noise ratio, as the channel quality that guarantees dimming as well as an adequate bit-error rate (BER), is also discussed.

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Section: Introductionmentioning

confidence: 99%

Optimal Signal Amplitude of Orthogonal Frequency-Division Multiplexing Systems in Dimmable Visible Light Communications

Yun

Lee

Ahn

et al. 2014

Journal of the Optical Society of Korea

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“…In VLC, both illumination and communication are simultaneously implemented [12], while only the communication is considered in OWC. Moreover, a lower average power is usually preferred for OWC, but VLC has a predefined average power following the users' requirement (dimming target), which is not an objective function but a constraint [13]. Therefore, the aforementioned characteristics of VLC should be considered in practical systems.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the aforementioned characteristics of VLC should be considered in practical systems. In [13], the channel capacity for VLC is analyzed by using the inverse source coding. In our previous paper [14], the tight capacity bounds are derived for the dimmable VLC under the non-negativity and average power constraints.…”

Section: Introductionmentioning

confidence: 99%

“…In [16], we further discussed the capacity-approaching input distribution and the channel capacity for pulse amplitude modulated VLC systems. However, the corrupting noises in [13]- [16] are all assumed to be additive Gaussian noise and independent of the signal. This assumption is reasonable if the ambient light is strong or if the receiver suffers from intensive thermal noise.…”

Section: Introductionmentioning

confidence: 99%

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Capacity bounds for dimmable visible light communications using PIN photodiodes with input-dependent Gaussian noise

Wang

Chen

et al. 2014

2014 IEEE Global Communications Conference

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In this paper, we focus on a dimmable visible light communication (VLC) system using PIN photodiodes. In such a system, the main distortion is caused by additive Gaussian noise, however, with a noise variance depending on the current signal strength. Under the non-negativity, peak power and dimmable average power constraints, the lower and upper bounds on the channel capacity are derived, respectively. Specifically, the derivation of the lower bound is based on the fact that the entropy of the output is always larger than the entropy of the input, while the derivation of the upper bound relies on the dual expression of the channel capacity and the notion of capacity-achieving input distribution that escape to infinity. Numerical results show that the gap between the lower and upper bounds is very small in the VLC application zone.

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“…ISC maximizes entropy by changing the ratio of 'On' symbols to 'Off' symbols adapted to the user's dimming requirements in on-off keying. Then, ISC was extended [10] to M-ary pulse amplitude modulation (M-PAM), where capacity was analyzed by mutual information [11], and adaptive modulation was also drawn.…”

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confidence: 99%

Color Intensity Modulation for Multicolored Visible Light Communications

Ahn

Kwon

2012

IEEE Photon. Technol. Lett.

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This letter explains color space and signal space in visible light communications using multicolored LEDs. We propose the concept of color intensity modulation that satisfies color and dimming requirements in color space and maximizes communication capacity in signal space. The capacity values and corresponding signal constellation examples are given for orthogonal and nonorthogonal channels. Index Terms-Color matching, dimming, inverse source coding (ISC), optical wireless communication, visible light communication (VLC).

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Capacity Analysis of M-PAM Inverse Source Coding in Visible Light Communications

Cited by 57 publications

References 9 publications

Optimal Signal Amplitude of Orthogonal Frequency-Division Multiplexing Systems in Dimmable Visible Light Communications

Optimal Signal Amplitude of Orthogonal Frequency-Division Multiplexing Systems in Dimmable Visible Light Communications

Capacity bounds for dimmable visible light communications using PIN photodiodes with input-dependent Gaussian noise

Color Intensity Modulation for Multicolored Visible Light Communications

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