calculation of satellite operating band width


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6.calculation of satellite operating band width

1. In put data rate (Kb/s) It is the number of actual message signals per second.

2. Link overhead factor (% Worst case) It represents additional transmitting delay between message bits to avoid collision or inter-symbol interference of message bits.

3.FEC rate coding Forward error correction technique enables the receiver to both Detect and correct errors without needing to inform the transmitter

4. Bits/Symbol (m) It is defined as the number of symbols transmitted by the transmitter per bit

5. Effective in put data rate (kbps)
Effective in put data rate (kbps) can be calculated by the formula
Effective input data rate = Input data rate(kbps)/(1+Link over head factor/100)
……………………………….[8]

Example: Calculate effective input data rate (kb/s) for a satellite input data rate 9.6 K B/S. And link overhead factor 0 %.
Effective in put data rate = Input data rate (K B/S)/(1+ link overhead factor/100)
= 9.6/(1+0/100)= 9.6 KB/S

6. Transmission rate(kbps)
Transmission rate = In put data rate / F E C rate coding ………………………[9]

Example: Calculate transmission   rate (kb/s) for a satellite input data rate 9.6 K B/S. FEC coding 0.50 .
Solution:
                      Transmission rate= In put data rate/FEC coding
                                                =9.6/0.5=19.2 k B/S

7. Satellite operating band-width (kbps) per carrier
       Satellite operating band width (kbps) per carrier
                                                           = (Transmission rate/Bits per symbol)*1.4
                                                                                  …………………………………[10]

Example: calculate satellite operating band-width(kbps)per carrier for the satellite transmission rate 19.2 bits per symbol =2
Satellite operating band width (kbps) per carrier
= (Transmission rate/Bits per symbol)*1.4
=(19.2/2)*1.4=13.44 kB/S

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