Title :
Transmission of SDH signals through future satellite channels using high-level modulation techniques
Author :
Aghvami, A. Hamid ; Gemikonakli, Orhan ; Kato, Shuzo
Author_Institution :
King´´s Coll., London Univ., UK
fDate :
8/1/1992 12:00:00 AM
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
Keywords :
amplitude modulation; digital radio systems; digital signals; satellite relay systems; synchronisation; telecommunication channels; transponders; 16-ary QAM; 16-ary quadrature amplitude modulation; 36 MHz; 4 GHz; 54 MHz; 6 GHz; 64-ary QAM transmissions; SDH signals transmission; SHF; STM-1; fade margins; high bit rate signals; high-level modulation techniques; nonlinear satellite channels; synchronous digital hierarchy; synchronous transport module-level 1; transponder bandwidth; Bandwidth; Bit rate; Forward error correction; Optical fibers; Quadrature amplitude modulation; Satellite broadcasting; Satellite communication; Satellite ground stations; Synchronous digital hierarchy; Transponders;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
