Raised Cosine Pulse Shaping for Pre-equalized Optical Wireless Links

Autor:	Grahame Faulkner, Dominic O'Brien, Atchutananda Surampudi, Ravinder Singh, Steve Collins
Rok vydání:	2021
Předmět:	Computer science Transmitter Electronic engineering Equalization (audio) Optical wireless Bandwidth (computing) Keying Time domain Electrical and Electronic Engineering Pulse shaping Raised-cosine filter Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials
Zdroj:	IEEE Photonics Technology Letters. 33:912-915
ISSN:	1941-0174 1041-1135
DOI:	10.1109/lpt.2021.3069115
Popis:	Their programmability means that digital pre-equalization techniques are more flexible than analog circuit equalizers. However, their performance depends on the number of samples per data symbol needed to accurately represent the pre-equalized time domain pulse. This requirement limits the maximum data rate that can be generated by a digital-to-analog converter (DAC). Another challenge when pre-equalizing the signal applied to a transmitter is the need to restrict the maximum voltage applied to the transmitter. Given these challenges, this paper demonstrates the benefits of constructing digitally pre-equalized On-Off Keying (OOK) symbols with raised cosine pulses. In addition, results are presented which show that each symbol can be represented with as few as 5 samples per bit. The performance of the proposed equalization method is investigated using an off-the-shelf LED-based optical wireless communication (OWC) link. Using equalization, the bandwidth of the link is increased by a factor of 10 to 100 MHz. Consequently, the data rate achievable with a 2 GSa/s DAC is 400 Mb/s.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cbecb9fb30fb6202cf5ff379415957d7 https://doi.org/10.1109/lpt.2021.3069115 Zobrazit plný text záznamu