5. SECTON E
ANSWERS
1.
Processing Gain = 10log(Rc/Rb)=10log(3840/12.2)= 10log(314.75)= 24.9
Processing Gain = 10log(3840/144)=14.2
2.
Spreading Factor = Rc/Rb = 3840/64=60
3.
Eb/No= SNR + 10log (Rc/Rb)
4=SNR+10log(3840/64)
6. SNR=4-17.78= -13.78
SNR -13.78 means the no of users = 10 Raise power (-13.78/10)=1/24 that gives 24 users
as pole capacity.
Noise Rise=3 db that means how the power comes from the users and how from thermal.
That means limiting the no of users to 12. The noise from own cell is 30 % of the total
thereby giving the simultaneous users at 64kbps to 24*.3= 7 users
Cell capacity at 64 kbps=7*64=448 kbps=.4 Mbps
M=3840000 / 4(1.6)*64000=9 ( this is assuming that no intereference from adjacent
cells, that means this is equailent to 12 of Reverse link calculation above)
7. SNR=4-17.78= -13.78
SNR -13.78 means the no of users = 10 Raise power (-13.78/10)=1/24 that gives 24 users
as pole capacity.
Noise Rise=3 db that means how the power comes from the users and how from thermal.
That means limiting the no of users to 12. The noise from own cell is 30 % of the total
thereby giving the simultaneous users at 64kbps to 24*.3= 7 users
Cell capacity at 64 kbps=7*64=448 kbps=.4 Mbps
M=3840000 / 4(1.6)*64000=9 ( this is assuming that no intereference from adjacent
cells, that means this is equailent to 12 of Reverse link calculation above)
