Abstract: Based on development of SCPC earth station in the specialsatellite communication network of the aerospace systems,the spectralshaping and phase equalization techniques are described in this paper,which are effective on compressing transmission spectrum and reducingintersymbol—interference (ISI).The measurement and operation show thatthe techniques have the evident advantage to improving the spectral effi-ciency and bit error rate performance of the system.

Key words: Satellite communication, Modulation technique, Phase equalization, Design