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## Calculate the efficiency and spectral efficiency of the DS-CDMA system with an omnidirectional cell using the following data :

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Bandwidth efficiency = 0.9,

Frequency reuse efficiency = 0.45,

Capacity degradation factor = 0.8,

Voice activity factor = 0.4,

information bit rate = 16.2 kbps,

Eb/I0 = 7 dB,

One way system bandwidth = 12.5 MHz. Neglect other sources of interferences.

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## 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,

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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.

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