Adaptive suboptimum detection of optical PPM signal with detection matrix and centroid tracking

Research output: Contribution to journalConference articlepeer-review

Abstract

In some applications of optical communication systems, such as satellite optical communication and atmospheric optical communication, the optical beam wanders on the detector surface due to vibration and turbulence effects, respectively. The wandering of the beam degrades the communication system performance. In this research, we derive a mathematical model of an optical communication system with a detection matrix to improve the system performance for direct detection pulse position modulation (PPM) We include a centroid tracker in the communication system model. The centroid tracker tracks the center of the beam. Using the position of beam center and an apriori model of beam spreading we estimate the optical power on each pixel (element) in the detection matrix. Based on knowledge of the amplitudes of signal and noise in each pixel, we tune adaptively and separately the gain of each individual pixel in the detection matrix for communication signals. Tuning the gain is based on the mathematical model derived in this research. This model is defined as suboptimal due to some approximations in the development and is a suboptimum solution to the optimization problem of n multiplied by m free variables, where U,mare the dimensions of the detection matrix. Comparison is made between the adaptive suboptimum model and the standard model. From the mathematical analysis and the results of the comparison it is clear that this model improves significantly communication system performance.

Original languageEnglish
Pages (from-to)91-102
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3124
DOIs
StatePublished - 1 Dec 1997
EventPhotonics for Space Environments V - San Diego, CA, United States
Duration: 30 Jul 199730 Jul 1997

Keywords

  • Optical communication
  • PPM
  • Satellite communication
  • Tracking

Fingerprint

Dive into the research topics of 'Adaptive suboptimum detection of optical PPM signal with detection matrix and centroid tracking'. Together they form a unique fingerprint.

Cite this