A communication satellite system is used exclusively for voice signal transmission, it employ an 8-psk modulation scheme with a spectral efficiency of 3.356 b/8/Hz,

7E 4046
Marks : 8

Corresponding to an error power (Pe) of 10-8
While maintaining a C/N equal to 21.5 dB of earth station transmit with TDMA one brust per frame for a frame period of 2ms, determine the maximum number of voice channels the transponder bandwidth can accommodate if the total number of guard and preamble bits is 680.