A Demodulation Method Using a Gaussian Mixture Model For Unsynchronous Optical Camera Communication With on-off Keying

Shiraki, Yoshifumi; Satō, Takashi; Kamamoto, Yutaka; Izumi, Taisuke; Nakahara, Yu; Kondo, Kyosuke; Moriya, Takehiro

doi:10.1109/jlt.2020.3043046

Cited by 9 publications

(6 citation statements)

References 28 publications

(45 reference statements)

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“…Let denote the number of image frames required by the HS camera to synchronize the timing and decode the bit sequence on the receiver. Our previous work experimentally confirmed that when there is a clock difference between the transmitter and receiver, the bit error rate (BER) performance is stable when ≤ 100 [11]. Fig.…”

Section: Resultsmentioning

confidence: 61%

“…Additionally, for high-speed communication based on the HS camera receiver, we conducted a simulation with a OCC channel model to check the bit-error-rate (BER) performance of the inverse-LPS when HD-SPD and SD-SPD are used as FEC decoders. To make our simulation reflect a realistic environment, we applied the empirical parameters of the OCC experiment system from our previous work [11].…”

Section: A System Modelmentioning

confidence: 99%

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Distribution Matching for Dimming Control in Visible-Light Region-of-Interest Signaling

et al. 2023

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We propose a two-level dimmer based on binary distribution matching where a low-rate signal controls the output probability distribution of a high-rate bit sequence, which can be used in region-of-interest (RoI) signaling applications. To reduce the rate loss of the dimmer, we propose the extended multisetpartition distribution matching (EMPDM) algorithm with a novel binary-tree-structure implementation. In addition, we introduce 4p-EMPDM, a compact version of EMPDM, which has a typical composition (TC) and four leading composition pairs (CPs). The codebook of 4p-EMPDM includes only run-length-aware codewords, which reduces the maximum run-length of the transmitted bit sequence by 4.27 times. Hence, it guarantees flicker mitigation for visible-light RoI signaling systems at 6 kHz without using any run-length limited code (non-RLL). Using experimental data collected from the low-rate RoI signaling prototype, we introduced a threshold range where both intensity and area information of the received training symbols can be exploited to optimize the shaping ratios of the 4p-EMPDM dimmer. Because of the non-RLL feature, the proposed system can support soft-decision forwarderror-correction (FEC) decoding to improve reliability. Our system outperforms related systems based on hybrid modulation schemes in terms of spectral efficiency, bit rate, and minimum required optical clock rate.

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Section: Resultsmentioning

confidence: 61%

Section: A System Modelmentioning

confidence: 99%

Distribution Matching for Dimming Control in Visible-Light Region-of-Interest Signaling

et al. 2023

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“…Let β denote the number of required image frames that the high-speed camera uses to synchronize the timing and decode the bit sequence on the receiver. In our previous work [9], experimental results showed that when there is a clock difference between the transmitter and receiver, stable bit error rate (BER) performance is achieved with 60 ≤ β ≤ 100. Fig.…”

Section: Simulation Resultsmentioning

confidence: 99%

A Probabilistic Shaping Approach for Optical Region-of-Interest Signaling

Nguyen

Shiraki

Muramatsu

et al. 2022

IEEE Photon. Technol. Lett.

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We propose a probabilistic shaping approach for region-of-interest signaling, where a low-rate signal controls the desired probabilistic ranges of a high-rate data stream using a flexible distribution controller. In addition, we introduce runlength-aware values for frozen bit indices in systematic polar code to minimize the run-length without using run-length-limited code. Our compact system can support soft-decision forward-errorcorrection decoding with excellent spectral efficiency compared with related work based on hybrid modulation schemes.

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“…It can be seen from these equations that P rx and A proj decrease with increasing distance (constant power density on the image sensor). Thus, the received optical power at each pixel is expressed in Equation ( 3) by combining Equations ( 1) and (2).…”

Section: Multispectral Camera Communicationmentioning

confidence: 99%

Multispectral Optical camera communication links based on spectral signature multiplexing

Moreno

Guerra²,

Rufo

et al. 2023

IET Optoelectronics

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Optical camera communication is foreseen to have an essential role in future systems requiring wireless communication capability. In this regard, high‐spectral‐resolution cameras, such as multispectral (MS) cameras, present specific characteristics that can be exploited to provide new features to optical camera communication links. Using the MS cameras' features to take advantage of the light‐emitting diode (LED) behaviour in a novel communication scheme is focussed. Notably, LED spectral response curves are different when their temperature changes. Therefore, these differences can be detected based on the MS cameras' spectral resolution. Thus, more than one communication channel can be attained using the same LED device since the camera can distinguish the different LED spectral signatures. This new approach is analysed in this work, including some equalisation techniques applied to the channel matrix in the receiver to improve the extraction of the transmitted signal reducing the inter‐channel interference. For the specific MS camera employed in the experiments, up to two distinct channels could be obtained with the same transmitter at different temperatures, getting a bit error rate below the forward error correction limit. However, obtaining satisfactory results is highly dependent on the variation that temperature causes in the spectral signatures of the LEDs, so further experiments are recommended in future work with different devices.

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A Demodulation Method Using a Gaussian Mixture Model For Unsynchronous Optical Camera Communication With on-off Keying

Cited by 9 publications

References 28 publications

Distribution Matching for Dimming Control in Visible-Light Region-of-Interest Signaling

Distribution Matching for Dimming Control in Visible-Light Region-of-Interest Signaling

A Probabilistic Shaping Approach for Optical Region-of-Interest Signaling

Multispectral Optical camera communication links based on spectral signature multiplexing

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