Abstract
The authors discuss the possibility of transmitting synchronous digital hierarchy (SDH) signals through two-link nonlinear satellite channels. Transmitting such high bit rate signals through a standard 54 MHz or 36 MHz transponder bandwidth requires the use of high-level modulation schemes. The techniques and technologies needed to make the use of 16-ary quadrature amplitude modulation (QAM) and 64-ary QAM transmissions feasible for future satellite communication systems are examined. It is shown that it is possible to transmit a synchronous transport module-level 1 (STM-1) signal through a standard 54 or 36 MHz transponder bandwidth using 16-ary QAM or 64-ary QAM transmission, respectively, for the 6/4 GHz band. However, for higher frequency bands, due to high fade margins needed to achieve the high availability and performance for SDH systems, is not practical to transmit the STM-1 signal through such standard transponder bandwidths.
| Original language | English |
|---|---|
| Pages (from-to) | 1030-1036 |
| Number of pages | 7 |
| Journal | IEEE Journal on Selected Areas in Communications |
| Volume | 10 |
| Issue number | 3 |
| Publication status | Published - 1992 Aug |
ASJC Scopus subject areas
- Computer Networks and Communications
- Electrical and Electronic Engineering