Performance analysis of indoor joint illumination and communication systems using light emitting diodes and laser diodes

The abundant and unlicensed optical spectrum is utilized for communication in Joint Illumination and visible-light Communication (JIC) technique through the indoor illumination sources such as light emitting diodes (LED) and Laser diodes (LD). With a view toward green technologies, the power sharing LD based JIC system is mathematically modeled and its performance is compared with that of LED based JIC system. In order to reduce the directionality of Laser, the transmissive diffuser is used in the LD based JIC model. The performance of modeled LD based JIC system is analyzed in terms of illuminance distribution, delay spread, achievable data rate and energy efficiency. With the consideration to eye and skin safety, the analysis is carried out under the illumination constraint of indoor work places. The LED based JIC system has the maximum delay of 0.1738 ns and thus it can offer the data rate of 575 Mbps. The LD based JIC system provides the data rate of 794 Mbps due to its relatively less delay of 0.1258 ns. While considering the power consumption for having these data rates, the LED based JIC system is more energy efficient than the LD based JIC system. The opportunities and obstacles of LED and LD for the simultaneous illumination and communication objective are also addressed.

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