A CO-DESIGNED CODING, MODULATION AND EQUALIZATION SCHEME FOR THE TRANSMISSION OF 155-CENTER-DOT-52 MBIT S DATA OVER A 72 MHZ INTELSAT TRANSPONDER .1. CODING AND MODULATION PERFORMANCE/

This paper reports on the application of co-designed coding, modulatio n and equalization techniques to an INTELSAT requirement for transmitt ing 155.52 Mbit/s data over a 72 MHz satellite channel. A specific sol ution as regards coding, modulation and equalization is proposed and a nalysed that differs from 'standard' concatenation in that the inner d ecoder integrates equalization, modulation and coding. In Part 1 resul ts of extensive computer simulations are presented, examining the effe ct of adjacent channel interference, co-channel interference, non-line ar distortion in representative ground and space TWTAs, multiplexers a nd filter distortion. In Part 2 a novel technique for integrating deci sion feedback equalization into the inner decoder is described. The ga ins in integrating the coding and equalization are shown to be signifi cant for channels that need equalizing.