Diversity Based on Oversampling Technique for PAM-4 in Optical Wireless Communication Systems

Authors

  • Kidsanapong Puntsri Rajamangala University of Technology Isan, Khonkhaen Campus
  • Ekkaphol Khansalee Rajamangala University of Technology Isan, Khon Kaen Campus
  • Puripong Suttisopapan Khon Kaen University

DOI:

https://doi.org/10.4186/ej.2020.24.4.133

Keywords:

diversity, realtime implementation, pulse amplitude modulation, optical wireless communication systems

Abstract

This paper utilizes the concept of oversampling to achieve diversity for optical wireless communication (OWC) systems with four levels pulse amplitude modulation (4-PAM). We propose two contributions to the development of OWC applications. The first one is the implementation of realtime PAM-4 transmitter (Tx) using field-programmable gate array (FPGA). The second one is diversity using oversampling method which can be used to improve the system performance. In this case, each symbol is sampled more than two times, and, averages them all together.  The proposed method is fully verified by experimental demonstration for both Tx realtime implementation and the receiver (Rx). The digital PAM format from FPGA is converted to analog format by using a digital-to-analog converter (DAC). With the update rate of 400 Msps, the proposed OWC systems can provide the communication speed over 800 Mbps; and, only a few FPGA resource usages are consumed. The experimental results showed that the bit error rate (BER) free can be achieved applying diversity using oversampling with four taps. Additionally, the communication distances up to 14 m is successfully transmitted.

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Author Biographies

Kidsanapong Puntsri

Department of Electronics and Telecommunication, Faculty of Engineering, Rajamangala University of Technology Isan, Khon Kaen Campus, Khon Kaen, 40000, Thailand

Ekkaphol Khansalee

Department of Electronics and Telecommunication, Faculty of Engineering, Rajamangala University of Technology Isan, Khon Kaen Campus, Khon Kaen, 40000, Thailand

Puripong Suttisopapan

Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, 40000, Thailand

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Published In
Vol 24 No 4, Jul 31, 2020
How to Cite
[1]
K. Puntsri, E. Khansalee, and P. Suttisopapan, “Diversity Based on Oversampling Technique for PAM-4 in Optical Wireless Communication Systems”, Eng. J., vol. 24, no. 4, pp. 133-141, Jul. 2020.

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