Novel approach for increasing the peak-to-average optical power ratio in rate-adaptive optical wireless communication systems

Abstract

A new and simple rate-adaptive transmission scheme for indoor unguided optical links is proposed. This scheme is based on the use of variable silence periods and on-off keying (OOK) formats with memory. These variable silence times are used for modifying the statistics of the amplitude sequence regarding the statistics of the message sequence, giving an increase in the peak-to-average optical power ratio. This is a favourable characteristic in intensity modulation and direct detection infrared links. In this fashion, OOK formats with Gaussian pulses modifying their position within the symbol period are adopted, obtaining a good trade-off between performance and required complexity. This is applied to links operating at a high initial bit rate, providing a signalling rate with a wide dynamic range and a relevant improvement in performance with gradual complexity in implementation, compared with the scheme proposed and specified in the Advanced Infrared (AIr) standard by the Infrared Data Association (IrDA), which is based on repetition coding and pulse-position modulation.

Antonio García-Zambrana

Professor of Telecommunications Engineering

Professor at the University of Málaga working on wireless optical communications, free-space optical links, underwater optical wireless communications, visible light communications, and FPGA/RFSoC-based real-time prototyping.

Antonio Puerta-Notario

Emeritus Professor / Senior Researcher

Emeritus Professor at the University of Málaga with a long-standing research activity in signal theory, optical wireless communications, visible light communications, free-space optical links and communication system modelling.