Dynamic decision threshold and adaptive coherent detection in FSO communication system

Zixiong Wang, Wen De Zhong, Changyuan Yu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

In this paper, we first compare the bit error rate (BER) performance of OOK FSO transmission systems under noncoherent and coherent detections. With coherent detection, BER of 109can be achieved under different atmospheric turbulence scenarios from weak to strong. In addition, we propose a dynamic decision threshold scheme to further improve the performance of coherent detection, where the decision threshold is varied in every sub-millisecond time slot. It is found that when the power of local oscillator is 8dBm, dynamic decision threshold scheme provides a 4.0dB power reduction in achieving BER of 109towards traditional fixed decision threshold scheme. In addition, we propose an adaptive coherent detection in FSO system, where a high power-local oscillator (LO) is used to mitigate the deep fading while a low power-LO is to mitigate the rest fading scenarios. Result shows that the outage probability is reduced completely and the average power is only 10% of the high power-LO
Original languageEnglish
Title of host publicationICICS 2011 - 8th International Conference on Information, Communications and Signal Processing
DOIs
Publication statusPublished - 1 Dec 2011
Externally publishedYes
Event8th International Conference on Information, Communications and Signal Processing, ICICS 2011 - Singapore, Singapore
Duration: 13 Dec 201116 Dec 2011

Conference

Conference8th International Conference on Information, Communications and Signal Processing, ICICS 2011
Country/TerritorySingapore
CitySingapore
Period13/12/1116/12/11

Keywords

  • adaptive coherent detection
  • dynamic decision threshold
  • free-space optical (FSO)

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Information Systems
  • Signal Processing

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