Efficient demodulation scheme for rolling-shutter-patterning of CMOS image sensor based visible light communications.

Chien-Hung Yeh,Chia-Wei Chen,Yang Liu,Chi-Wai Chow

doi:10.1364/oe.25.024362

Abstract

Recently even the low-end mobile-phones are equipped with a high-resolution complementary-metal-oxide-semiconductor (CMOS) image sensor. This motivates using a CMOS image sensor for visible light communication (VLC). Here we propose and demonstrate an efficient demodulation scheme to synchronize and demodulate the rolling shutter pattern in image sensor based VLC. The implementation algorithm is discussed. The bit-error-rate (BER) performance and processing latency are evaluated and compared with other thresholding schemes.

Highlights

Visible light communication (VLC) has attracted much interest recently because it can provide wireless communication using the visible light spectrum to relieve the exhausted traditional radio-frequency (RF) communication spectrum
Even the low-end mobile-phones are equipped with a high resolution complementary-metal-oxide-semiconductor (CMOS) image sensor; supporting highdefinition (HD) moive capture at frame rate even up to 60 frame-per-second
Other thresholding schemes, such as quick adaptive (QA) [12] and Bradley adaptive (BA) [13] used in previous works are compared in terms of BER performance and processing latency

Summary

Introduction

Visible light communication (VLC) has attracted much interest recently because it can provide wireless communication using the visible light spectrum to relieve the exhausted traditional radio-frequency (RF) communication spectrum. One approach of CMOS image sensor based VLC depends on the global shutter effect of the image sensor This approach uses a frame or multiple frames to represent one logic bit; and the data rate is usually limited; and a data rate of only 150 bit/s (3 x 50 bit/s when using red-green-blue LEDs) based on this approach was demonstrated [9]. Another approach depends on the rolling shutter effect, in which the detection data rate can be significantly enhanced [10,11,12]. The bit-error-rate (BER) performance and processing latency are evaluated and compared with other thresholding schemes

Experiment and algorithm

Results and discussions

Summary