Transmission performance of ACSSB on satellite channels

The voice performance and digital signal transmission performance of ACSSB (amplitude companded single sideband modulation) on satellite channels are described. The results of field experiments for evaluating the performance show that the required carrier to noise power density ratio, C/No, for voice communications is greater than 45 dB-Hz, that data transmission of 1200 b/s with a bit error rate of 10 ^-3 is made possible in the minimum link budget for voice communications, and that it is possible to transmit GIII facsimile signals with good quality when the C/No is more than 50 dB-Hz. A study on the required total output power of a transponder in an ACSSB multichannel system for voice signal transmission is made, and a comparison of the ACSSB system with the conventional NBFM (narrowband frequency modulation) system indicates that the channel capacity of ACSSB is greater than that of NBFM not only with regard to the frequency bandwidth limit of a transponder but also in its output power limit