Evaluation of the MARISAT Satellite UHF Wideband Channel
Abstract
The use of the MARISAT satellite UHF wideband channel as a radio link for multiple users is investigated. An analytical evaluation of the link is performed for up to 10 users sharing the non-processing transponder's 500 kHz bandwidth. The terminal link carrier-power-to-noise-power-spectral-density ratio, C/N o, is evaluated for data rates of 2.4, 4.8 and 16 kbps, and for terminal effective isotropic radiated power (EIRP) levels from 17 to 30 dBW. Analyses are performed for cases in which all terminals transmit with the same EIRP and also for cases in which a single user is either 3 dB above or below the other users. A variety of loading schemes are considered to demonstrate the variation in user SNR degradation due to hardlimiting on-board the transponder. The terminal C/N o is compared to the minimum performance requirement plus a 3 dB margin to determine the link capacity. Two experiments which were run to evaluate the MARISAT UHF wideband channel spectrum usage and to measure the terminal C/N o are described. Power spectral density graphs of the wideband channel and individual subchannels are presented. The results of a 24-hour test to monitor the terminal C/N o are discussed in terms of the observed C/N o fluctuations and spectrum anomalies.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1990
- Accession Number
- ADA233666
Entities
People
- W. R. Seed
Organizations
- Defence Research and Development Canada