It is problem about digital communication system Ten 32kbits

It is problem about digital communication system.

Ten 32-kbit/s delta-modulated voice channels and four 64-kbit/s computer outputs are multiplexed using TDM (time-division multiplexing). TDM [frames are 125 mu s long. 8 control bits, per frame are added. Show the bit rate of the TDM output is 640 kbits/s. The TDM output is to be transmitted over a radio channel centered at 10 MHz. A transmission bandwidth of 240 kHz at this carrier frequency is available. Specify a modulation technique that may be used if sinusoidal roll-off shaping with r = 0.5 is used.. Repeat (6), using-\'a\'different modulation technique, with\' the roll-off \' factor reduced to r = 0.1.

Solution

a) bit rate of TDM = 64*10

= 640

b) r = 10*12/2404= 0.5