Modem simulations for possible use in Space StationTwo candidate modem structures for use in the Space Station Multiple-Access Communications System were simulated using a software simulation package to obtain symbol error-rate curves. These systems represent an evolutionary QPSK-through-8 PSK modulation format for the input data streams. It was found that the use of phase-staggered QPSK modems would give lower expected implementation loss than a modem based upon the polarity-Costas-loop method. However, the latter would represent a simpler hardware investment to realize the modem structure for both QPSK and 8 PSK.
Document ID
19890043659
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Horan, Stephen (New Mexico State University Las Cruces, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking