SYSTEM STUDY FOR SUPER MOBILE COMMUNICATIONS SATELLITE GROUND STATION.
Abstract
The work included analyses of certain digital modulation systems which are potential competitors to the analog systems reviewed earlier, analysis of antenna noise, further develop ment of antenna array systems, a development of a method for field calculation of antenna pointing directions, and a survey of existing and potential low noise receiving systems. The modulation studies indicate that only scant improvement over the capability of angle modulation feedback techniques are possible with digital systems - assuming the published results on the former are correct. The conclusion is based on analyses carried out on several multistate PCM transmission systems. One of these, using a weighted pulse duration, the weighting being dependent on the significance of the information represented by the pulse does not appear to have been studied before. It gave better results than a single error coded system, a deltasigma system, and of course, an unweighted system. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 1964
- Accession Number
- AD0602003
Entities
People
- F. Haber
- J. Feld
- K. Ya'coub
- M. Akiyama
- R. Moff
Organizations
- University of Pennsylvania