Temporal noise analysis and measurements of CMOS active pixel sensor operating in time domain

Campos, F. de; Ulson, José Alfredo Covolan; Swart, Jacobus W.; Deen, M. Jamal; MARINOV, O.; Junior, Dib Karam

doi:10.1109/sbcci.2013.6644859

Cited by 1 publication

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“…where h(t) is the combined impulse response of the channel and camera, η is the quantum efficiency of the IS, ⊗ is the time domain convolution, and n(t) is the additive white Gaussian noise including the ambient light induced shot noise and the noise in the camera (i.e., fixed pattern, thermal (FPN)), photocurrent shot (optical excess and electronics), and flicker noise sources), as shown in Fig. 1(b) [25]. If the definition of power is scaled by the number of points in the signal, it will give the mean squared error (MSE).…”

Section: Proposed Mimo-occ System a Cmos Is Noise Characterization Wmentioning

confidence: 99%

Spatial frequency-based angular behavior of a short-range flicker-free MIMO–OCC link

et al. 2020

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In this paper, we provide a solution based on spatial frequency f sf to study the angular behavior of a flicker-free, short-range indoor multiple-input multiple-output (MIMO) optical camera communications (OCC) link. We focus on the experimental investigation of OCC's performance for the transmitters (Txs) [i.e., light-emitting diode (LED) based arrays] located at the same and different distances from the receiver (Rx) with the off-axis rotation angle θ. We have used two 8 × 8 distributed LED arrays and a commercial low-cost complementary metaloxide-semiconductor (CMOS) Raspberry Pi camera with the rolling-shutter capturing mode as the Tx and Rx, respectively. The image and the respective communications link quality metrics are measured in terms of the peak signal-to-noise ratio (PSNR) and the rate of successfully received bits with respect to f sf for different camera shutter speeds (SS). A CMOS image sensor noise characterization is carried in terms of the signal-to-noise ratio (SNR) and PSNR. The proposed study provides a 100% success rate in data reception at the optimum θ of 50 • at lower captured values of f sf , which is projected onto the image sensor in the form of pixels. Moreover, the effect of channel saturation over f sf is studied with respect to θ and SS and we show that, for θ exceeding the optimum value along transmission range, the f sf area of the Txs reduces to less than ∼50% of the captured Tx units at θ of 0 • , where no data can be fully recovered.

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Section: Proposed Mimo-occ System a Cmos Is Noise Characterization Wmentioning

confidence: 99%

Spatial frequency-based angular behavior of a short-range flicker-free MIMO–OCC link

et al. 2020

View full text Add to dashboard Cite

show abstract

Temporal noise analysis and measurements of CMOS active pixel sensor operating in time domain

Cited by 1 publication

References 20 publications

Spatial frequency-based angular behavior of a short-range flicker-free MIMO–OCC link

Spatial frequency-based angular behavior of a short-range flicker-free MIMO–OCC link

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