Coding of digital pulse interval modulation in indoor optical communication systems

Amiri, Seyedeh Maryam (2010) Coding of digital pulse interval modulation in indoor optical communication systems. Masters thesis, Northumbria University.

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Abstract

Over the recent years, there has been a huge development in areas of optical wireless communications, in particular modulation schemes. Some modulation schemes that are particularly suitable for the indoor optical wireless communications have been developed. These schemes have been developed mainly by considering issues such as band width and power efficiency, cost and system complexity. In this study, Digital Pulse Interval Modulation (DPIM) as an anisychronous PTM modulation scheme have been considered and studied. In order to improve its error performance, convolutional coding with Viterbi decoding has been applied to DPIM and the spectral characteristics of the coded DPIM (CC-DPIM) have been investigated. The mathematical analysis and computer simulations of CC-DPIM revealed that the code rate was larger for higher bit resolution. Applying convolutional coding on DPIM improved its error performance but at the cost of lower transmission throughput as compared to the uncoded DPIM. CC-DPIM spectral has DC component higher than DPIM. This will limit in maximum electrical high pass filtering and therefore is less effective when subjected to interference of artificial source of ambient light.

Item Type: Thesis (Masters)
Subjects: H600 Electronic and Electrical Engineering
H900 Others in Engineering
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
University Services > Research and Business Services > Graduate School > Master of Philosophy
Related URLs:
Depositing User: EPrints Services
Date Deposited: 03 May 2011 07:38
Last Modified: 10 Aug 2015 11:23
URI: http://nrl.northumbria.ac.uk/id/eprint/3769

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